LM2760 Datasheet. Www.s Manuals.com. Lm2760m5 National

User Manual: Marking of electronic components, SMD Codes S1, S1*, S15**, S15B, S16**, S17**, S18, S18**, S19**, S19B, S1G, s1A, s1P. Datasheets 1N4148WS, BBY31, LM2760M5, LM2765M6, LM3500TL-16, LR1120G-18-AF5-A-R, LR1120G-18-AL5-A-R, MMBT2222A, MMBT3904, R1162N151B, R1162N161B, R1162N171B, R1162N181B, R1162N191B, SD101AWS, SDS511Q, SI2301, SMBT2222A, SMBT3904, SMBT3904S, SMBT3904U, SST271, TS391G-AF5, TS391G-AL5.

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LM2760

3.3V Regulated Switched Capacitor Voltage Converter

General Description

The LM2760 is a switched-capacitor DC/DC converter that

generates a regulated 3.3V output capable of driving a load

up to 20mA (V

IN

≥2.5V). The wide input voltage range

(2.0V-4.4V) allows this device to be powered from several

types of batteries, including single cell lithium-ion, two-cell

alkaline, nickel-metal-hydride, and nickel-cadmium. The

LM2760 solution does not require an inductor and needs

only three small external ceramic capacitors. The miniscule

quiescent current of the part, typically 10µA unloaded,

makes the LM2760 ideal for low-current standby power rails.

The LM2760 is a switched-capacitor circuit that is controlled

by a gated oscillator. Both a low-input-voltage boost mode

and high-input-voltage pass mode are implemented to opti-

mize efficiency over the full input voltage range.

Additional features of the LM2760 include thermal protection

and current limiting. The LM2760 is available in a small,

five-pin SOT-23 package.

Features

n3.3V ±4% Regulated Output

nUltralow Power: 10µA Typical Supply Current

nBoost and Pass Modes for Improved Efficiency

nInput Voltage Range: 2.0V to 4.4V

nOutput Current up to 20mA (V

IN

≥2.5V)

nOutput Current up to 10mA (V

IN

≥2.0V)

nInductorless solution

nSmall external parts count: 3 ceramic capacitors

n750kHz Switching Frequency

nSOT23-5 Package

nShort-Circuit and Thermal Protection

Applications

nBattery-Operated Devices

nCellular Phone

nStandby Power Supply

nMemory Keep-alive Power

Typical Application Circuit

20044301

December 2002

LM2760 3.3V Regulated Switched Capacitor Voltage Converter

© 2002 National Semiconductor Corporation DS200443 www.national.com

Connection Diagram

LM2760

SOT23-5 Package

NS Package Number MF05A

20044302

Top View

Pin Description

Pin #(s) Pin Name Description

1V

IN

Input supply connection

2 GND Ground connection

3V

OUT

Regulated 3.3V output

4 CAP+ Charge pump capacitor (+) connection

5 CAP- Charge pump capacitor (-) connnection

Ordering Information

Order # Package Type Package Marking Supplied as

LM2760M5 SOT23-5 S19B Rail (250 units/rail)

LM2760M5X SOT23-5 S19B Tape and reel (3000 units/reel)

LM2760

www.national.com 2

Absolute Maximum Ratings (Notes 1,

2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

IN

Pin: Voltage to GND −0.3V to 6V

Junction Temperature (T

J-MAX-ABS

) 150˚C

Continuous Power Dissipation Internally Limited

(Note 3)

V

OUT

Short-Circuit to GND Duration Unlimited

(Note 4)

Storage Temperature Range -65˚C to 150˚C

Lead Temperature 260˚C

(Soldering, 5 sec.)

ESD Rating (Note 5)

Human-body model:

Machine model

2kV

200 V

Operating Ratings (Notes 1, 2)

Input Voltage Range 2.0V to 4.4V

Recommended Output Current

2.5V ≤V

IN

≤4.4V 0mA to 20mA

2.0V ≤V

IN

≤2.5V 0mA to 10mA

Junction Temperature (T

J

) Range -40˚C to 100˚C

Ambient Temperature (T

A

) Range

(Note 6)

-40˚C to 85˚C

Thermal Information

Junction-to-Ambient Thermal 220˚C/W

Resistance (θ

JA

), SOT23-5

Package(Note 7)

Electrical Characteristics (Notes 2, 8)

Typical values and limits in standard typeface apply for T

J

=25

oC. Limits in boldface type apply over the operating junction

temperature range 0oC≤T

J

≤+85

oC[0

oC≤T

A

≤+70

oC (Note 9)] Unless otherwise specified: C

IN

= 4.7µF, C

FLY

= 0.1µF,

C

OUT

= 10µF(Note 10)

Symbol Parameter Conditions Min Typ Max Units

V

OUT

Output Voltage 2.5V ≤V

IN

≤4.4V,

0mA ≤I

OUT

≤20mA

3.17 3.3 3.43 V

2.0V ≤V

IN

≤4.4V,

0mA ≤I

OUT

≤10mA

3.17 3.3 3.43 V

I

Q

Quiescent Supply Current 2.0V ≤V

IN

≤4.4V, V

OUT

tied to

3.5V, unloaded (Note 11)

612 µA

I

IN

Normal Operation Supply

Current

2.0V ≤V

IN

≤4.4V, unloaded,

Time-averaged (Note 12)

10 µA

f

OSC

Oscillator Frequency V

IN

= 3.0V 750 kHz

V

p-p

Output Ripple Voltage V

IN

= 3.0V, I

OUT

= 10mA 60 mV

p-p

t

ON

V

OUT

Turn-On Time V

IN

= 3.0V (Note 13) 1 ms

I

SC

Output Short Circuit Current V

IN

= 3.0V 170 mA

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of

the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the

Electrical Characteristics tables.

Note 2: All voltages are with respect to the potential at the GND pin.

Note 3: Thermal shutdown circuitry protects the device from permanent damage.

Note 4: Excessive power dissipation will occur if the part is shorted to ground. Internal thermal shutdown will protect the device from permanent damage, but

thermal cycling of the part is likely to occur until the short is removed. Protection is guaranteed only for VIN ≤4.4V

Note 5: : The human-body model is a 100 pF capacitor discharged through a 1.5 kΩresistor into each pin. The machine model is a 200pF capacitor discharged

directly into each pin.

Note 6: Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 100oC), the maximum power

dissipation of the device in the application (PD-MAX), and the junction-to-ambient thermal resistance of the part/package in the application (θJA), as given by the

following equation: TA-MAX =T

J-MAX-OP -(θJA xP

D-MAX). When application conditions are within the specified operating ratings, maximum power dissipation of the

LM2760 is 70mW. This occurs when the output current is 20mA and the input voltage is 3.4V (edge of the "doubler" region). The maximum ambient temperature

operating rating (TA-MAX)of85

oC is calculated using θJA = 220oC/W and PD-MAX = 70mW. For more information on these topics, please refer to the Power

Dissipation section of this datasheet.

Note 7: Junction-to-ambient thermal resistance (θJA) of the SOT23-5 package is taken from a thermal modeling result, performed under the conditions and

guidelines set forth in the JEDEC standard JESD51-3. The test board is a 2-layer FR-4 board measuring 230mm x 125mm x 1.6mm. Thickness of the copper layers

is 18mm (1.0oz). Ambient temperature in simulation is 22˚C, still air. Power dissipation is 1W. Junction-to-ambient thermal resistance is a highly application-specific

parameter. The value of θJA of the LM2760 could fall in a range as wide as 150oC/W to 250oC/W (if not wider), depending on PCB and application conditions.

Note 8: : All room temperature limits are 100% tested or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed by correlation

using standard Statistical Quality Control methods (SQC). All limits are used to calculate Average Outgoing Quality Level (AOQL). Typical numbers are not

guaranteed, but do represent the most likely norm.

Note 9: With PD-MAX of 70mW and θJA of 220oC/W (see Note 6), the ambient temperature range of 0oC-to-70oC is provided for convenience and is calculated from

the 0oC-to-85oC junction temperature range that is used in determining guaranteed limits.

Note 10: CFLY,C

IN, and COUT : Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics

LM2760

www.national.com3

Electrical Characteristics (Notes 2, 8) (Continued)

Note 11: In determining quiescent supply current limits, the voltage on the VOUT pin is forced to 200mV above the typical VOUT to ensure that the charge pump is

inactive and all internal switches are off.

Note 12: The "normal operation" supply current specification is a measure of the time-averaged supply current when there is no current load connected to the output

of the LM2760. During this so-called normal operation, the charge pump occasionally is activated to provide charge to the output cap and keep the output voltage

from drooping. This is necessary because, when the pump is not active, the output capacitor supplies current to the internal feedback resistor divider. The occasional

pumping typically occurs every 2 seconds on average, contains a few short pump cycles, and results in a small increase in the average quiescent supply current.

Note 13: Turn-on time is measured from when the input voltage (VIN) is established until the output voltage crosses 90% of its final value.

Block Diagram

20044303

LM2760

www.national.com 4

Typical Performance Characteristics Unless otherwise specified: V

IN

= 3.0V, T

A

=25

oC, C

IN

=

4.7µF, C

FLY

= 0.1µF, C

OUT

= 10µF. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC’s).

Output Voltage vs. Input Voltage Output Voltage vs. Output Current

20044314 20044308

Power Efficiency No-Load Current vs. Input Voltage

20044309 20044310

Short Circuit Current vs. Input Voltage

20044311

LM2760

www.national.com5

Typical Performance Characteristics Unless otherwise specified: V

IN

= 3.0V, T

A

=25

oC, C

IN

=

4.7µF, C

FLY

= 0.1µF, C

OUT

= 10µF. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC’s). (Continued)

Output Voltage Ripple Load Step Response

20044312 20044313

LM2760

www.national.com 6

Operation Description

OVERVIEW

The LM2760 is a regulated switched capacitor converter that

efficiently provides a regulated 3.3V output capable of sup-

plying a load up to 20mA. The part has two regulation

modes: a doubler mode and a pass mode. The part config-

ures itself for doubler mode (2x) when the input voltage is

low (<3.4V typ.) and boost of the input voltage is required.

At higher input voltages, voltage boost is not needed, so the

part configures itself for pass mode (1x) to optimize effi-

ciency. Efficiency is optimized even further, especially when

output current is low, through the implementation of pulse-

frequency-modulated (PFM) regulation. The descriptions in

the sections to follow refer to the block diagram on the

previous page.

PULSE FREQUENCY MODULATED (PFM) REGULATION

The LM2760 uses pulse frequency modulation (PFM) to

provide highly efficient output voltage regulation. PFM is a

complicated-sounding term that simply means the part only

pumps when it needs to. If the output voltage is at or above

3.3V, the pump is turned off and supply current is minimized.

While in this rest state, output current is supplied by the

charge on the output capacitor. As charge is pulled off the

output capacitor, the output voltage will steadily fall until it

droops below 3.3V, at which time the pump reactivates and

output voltage is boosted. With PFM, the LM2760 requires

very little supply current "overhead": the input current is

generally only slightly above what is required to deliver

power to the output. This mode of operation allows the

LM2760 to maximize total solution efficiency.

DOUBLER MODE

When in doubler mode, the LM2760 operates as a regulated

switched capacitor voltage doubler. A two-phase non-

overlapping clock generated internally controls the operation

of the doubler. During the charge phase (ø1), the flying

capacitor (C

FLY

) is connected between the input and ground

through internal pass-transistor switches (S1 and S2) and is

charged to the input voltage. In the pump phase that follows

(ø2), the flying capacitor is connected between the input and

output through similar switches (S3 and S4). Stacked atop

the input, the charge of the flying capacitor boosts the output

voltage and supplies the load current.

PASS MODE

Pass mode of the LM2760 is implemented to improve effi-

ciency at higher input voltages (>3.4V typ.) where voltage

boost is not required. In this mode of operation, switches S1

and S2 are on continuously, and switch S4 is always off.

Resistance of switch S1 is increased in this mode to optimize

performance. Output voltage regulation is achieved by ap-

plying a PFM clock to switch S3.

N0-LOAD OPERATION

The minimal supply-current overhead of the LM2760 is most

apparent, and beneficial, when the LM2670 is operating

unloaded. With zero output current, supply current of the

LM2760 is only 10µA (typ). There are two components to this

10µA input current (listed as I

IN

in the Electrical Character-

istics): quiescent current (I

Q

) and time-averaged pump cur-

rent. Quiescent current is the steady-state DC current con-

sumed by the LM2760 internal circuitry, and is typically 6µA

when the part is unloaded. This is best observed by mea-

suring the input current of the part while forcing the voltage

on the output slightly above 3.3V (ensures the pump will not

activate: see below).

Even when output current of the LM2760 is zero, the pump

must occasionally be activated to keep the output voltage

from drooping. There is a resistor divider internal to the

LM2760 that is part of the regulation feedback loop, and is

connected to V

OUT

. Current through these resistors slowly

pulls charge from the output capacitor when the LM2760 is in

its rest state. The LM2760 must occasionally activate the

pump to restore charge to the output capacitor, thus keeping

the output voltage at the desired level. With a high-quality

10µF ceramic output capacitor (ensures capacitor current

leakage is minimal), the pump is only activated typically once

every 2 seconds. When the input current of these bursts are

averaged over time, they contribute only 4µA to the total

unloaded supply current of the LM2760.

The very low input current when the part is virtually unloaded

makes the LM2760 an excellent converter for generating

low-power keep-alive voltage rails.

STARTUP

When voltage is first connected to the input of the LM2760,

the output voltage is typically significantly less than the input

voltage, placing the part in pass mode. Pass mode, with the

increased resistance of switch S1, provides a controlled

start-up that limits input inrush current. Turn-on time of the

part, the time it takes for the output voltage to establish, is

typically 1ms when V

IN

= 3.0V.

THERMAL SHUTDOWN

To protect itself from damage caused by overheating, the

LM2760 implements a thermal shutdown mechanism. When

the junction temperature rises to 150oC (typ.), the part

switches itself into shutdown mode. The LM2760 releases

thermal shutdown when the junction temperature of the part

is reduced below 130oC (typ.). Thermal shutdown is most-

often triggered by self-heating, which occurs when there is

excessive power dissipation in the device and/or insufficient

thermal dissipation. When self-heating causes thermal shut-

down, thermal cycling usually occurs. Thermal cycling is the

repeating process where the part self-heats, enters thermal

shutdown (where internal power dissipation is practically

zero), cools, turns-on, and then heats up again to the ther-

mal shutdown threshold. Thermal cycling is recognized by a

pulsing output voltage and can be stopped by reducing the

internal power dissipation (reduce output current or input

voltage) or the ambient temperature.

SHORT CIRCUIT PROTECTION

The LM2760 contains short circuit protection circuitry that

protects the device from damage in the event of output

current and/or output shorts to ground. Current is limited to

170mA (typ.) when the output is shorted directly to ground

(V

IN

= 3.0V). When the LM2760 output is shorted, power

dissipation in the device is likely to be quite high, especially

when higher input voltages are present. In this event, ther-

mal cycling should be expected (see "Thermal Shutdown"

section).

Application Information

OUTPUT VOLTAGE RIPPLE

The magnitude of the voltage ripple on the output of the

LM2760 is highly dependent on application conditions: out-

put current and output capacitor properties, specifically. This

LM2760

www.national.com7

Application Information (Continued)

is illustrated in Figure 1, which graphs of output voltage

ripple versus input voltage for a few different output capaci-

tor values.

In addition to the amount of output capacitance present, the

ESR of the output capacitor also affects output voltage

ripple. A low-ESR ceramic capacitor is recommended on the

output to keep output voltage ripple low. Placing multiple

capacitors is parallel can reduce ripple significantly, both by

increasing capacitance and reducing ESR. When capacitors

are in parallel, ESR is in parallel as well. The effective net

ESR is determined according to the properties of parallel

resistance. Two identical capacitors in parallel have twice the

capacitance and half the ESR as compared to a single

capacitor of the same make. On a similar note, if a large-

value, high-ESR capacitor (tantalum, for example) is to be

used as the primary output capacitor, the net output ESR can

be significantly reduced by placing a low-ESR ceramic ca-

pacitor in parallel with this primary output capacitor.

CAPACITORS

The LM2760 requires 3 external capacitors for proper opera-

tion. Surface-mount multi-layer ceramic capacitors are rec-

ommended. These capacitors are small, inexpensive and

have very low equivalent series resistance (≤10mΩtyp.).

Tantalum capacitors, OS-CON capacitors, and aluminum

electrolytic capacitors generally are not recommended for

use with the LM2760 due to their high ESR, as compared to

ceramic capacitors.

For most applications, ceramic capacitors with X7R or X5R

temperature characteristic are preferred for use with the

LM2760. These capacitors have tight capacitance tolerance

(as good as +/-10%), hold their value over temperature

(X7R: +/-15% over -55oC to +125oC; X5R: +/-15% over

-55oCto+85

oC), and typically have little voltage coefficient.

Capacitors with Y5V and/or Z5U temperature characteristic

are generally not recommended. These types of capacitors

typically have wide capacitance tolerance (+80%, -20%),

vary significantly over temperature (Y5V: +22%, -82% over

-35oCto+85

oC; Z5U: +22%, -56% over -10oCto+85

oC), and

have poor voltage coefficients. Under some conditions, a

nominally 1µF Y5V or Z5U capacitor could have a capaci-

tance of only 0.1µF. Such detrimental deviation is likely to

cause these Y5V and Z5U of capacitors to fail to meet the

minimum capacitance requirements of the LM2760.

The table below lists some leading ceramic capacitor manu-

facturers.

Manufacturer Contact Information

TDK www.component.tdk.com

AVX www.avx.com

Murata www.murata.com

Taiyo-Yuden www.t-yuden.com

Vishay-Vitramon www.vishay.com

INPUT CAPACITORS

The input capacitor (C

IN

) is used as a reservoir of charge,

helping to quickly transfer charge to the flying capacitor

during the charge phase (ø1) of operation. The input capaci-

tor helps to keep the input voltage from drooping at the start

of the charge phase, when the flying capacitor is first con-

nected to the input, and helps to filter noise on the input pin

that could adversely affect sensitive internal analog circuitry

biased off the input line. As mentioned above, an X7R/X5R

ceramic capacitor is recommended for use. An input capaci-

tance of 4.7µF is recommended. It may be possible to re-

duce this value in applications where the maximum output

current is significantly less than 20mA. A smaller input ca-

pacitance typically results in higher input voltage ripple,

which may also show up as higher output voltage ripple as

well.

FLYING CAPACITORS

The flying capacitor (C

FLY

) transfers charge from the input to

the output, providing the voltage boost of the doubler. A

polarized capacitor (tantalum, aluminum electrolytic, etc.)

must not be used here, as the capacitor will be reverse-

biased upon start-up of the LM2760. For most applications, a

0.1µF X7R/X5R ceramic capacitor is recommended for C

FLY

.

Smaller flying capacitance typically will reduce the output

current capability of the part. The ESR also affects the output

current capability of the LM2760. For optimal performance, a

low-ESR ceramic capacitor (<10mΩtyp.) should be used.

Larger flying capacitance may increase output current capa-

bility, but it comes with the drawback of typically increasing

the magnitude of the output voltage ripple.

OUTPUT CAPACITOR

Both output capacitance and ESR of the LM2760 output

capacitor affect output voltage ripple. A low-ESR X7R/X5R

ceramic capacitor is the capacitor of choice for the LM2760

output. An output capacitance of 10µF is recommended for

most applications. Reducing output capacitance typically in-

creases output voltage ripple. In applications where the

maximum output current is significantly less than 20mA,

output voltage ripple is less of a concern and it may be

desirable to reduce the output capacitance.

POWER EFFICIENCY

Efficiency of the LM2760 mirrors that of an unregulated

switched capacitor converter cascaded with a linear regula-

tor when more-than nominal output current is present (≥

20044306

FIGURE 1. Output Voltage Ripple vs. Input Voltage

(T

A

=25

oC)

I

OUT

= 10mA, T

A

=25

oC

Top: C

OUT

= 4.7µF

Mid: C

OUT

= 10µF

Bottom: C

OUT

= 22µF

LM2760

www.national.com 8

Application Information (Continued)

1mA). The simplified power model of the LM2760, in Figure

2, will be used to discuss power efficiency and power dissi-

pation.

In calculating power efficiency, output power (P

OUT

) is easily

determined as the product of the output current and the 3.3V

output voltage. Like output current, input voltage is an

application-dependent variable. The input current can be

calculated using the principles of linear regulation and

switched capacitor conversion. In an ideal linear regulator,

the current into the circuit is equal to the current out of the

circuit. The principles of power conservation mandate the

ideal input current of a voltage converter must be equal to

the product of the gain of the converter and the output

current. When the input voltage is low (V

IN

≤3.4V) and the

LM2760 is in doubler mode (2x), the gain of the converter is

2. At higher input voltages (V

IN

>3.4V typ.) where the

LM2760 is in pass mode (1x), the gain of the converter is 1.

Adding a correction factor for supply current when the pump

is continuously active (I

PUMP

, 0.3mA typ.) gives an approxi-

mation for total input current which, when combined with the

other input and output parameter(s), yields the following

equations for efficiency:

A plot of efficiency versus input voltage, contained in Figure

4, gives a clear indication of how the pass mode improves

efficiency of the part at higher input voltages. Efficiency of

the part in both doubler and pass modes is inversely propor-

tional to input voltage, highest when the input voltage is low.

When the part transitions to pass mode, however, there is a

boost in efficiency that is a result of the reduced input current

needed for the 1x-configured converter. This multi-gain to-

pology maximizes LM2760 efficiency over the Li-Ion battery

input range: the average efficiency of the part over a 3.0V-

to-4.2V input range is 75% (1mA ≤I

OUT

≤20mA).

Comparisons of LM2760 efficiency measurements to calcu-

lations using the above equations have shown the equations

to be quite accurate approximations of actual efficiency

when output currents are at or above 1mA. Under these

conditions, the pump is on nearly continuously, and PFM-

related rest states are infrequent. At lighter loads, however,

pulse frequency modulation has a greater impact on part

performance. With PFM, the part only pumps when it needs

to boost the output voltage. Otherwise, it idles in a low-

current rest mode. PFM reduces the input current of the part

(effectively reducing I

PUMP

), improving the efficiency of the

part at lighter loads.

POWER DISSIPATION

LM2760 power dissipation (P

D

) is calculated simply by sub-

tracting output power from input power. Maximum power

dissipation of the LM2760 occurs at the high end of the

doubler mode (V

IN

= 3.4V). The following equation can be

used to estimate power dissipation of the LM2760 when in

doubler mode:

P

D-2X

=P

IN

-P

OUT

=[V

IN

x (2·I

OUT

+I

PUMP

)]-[V

OUT

xI

OUT

],

where I

PUMP

is the supply current when the pump is continu-

ously active (0.3mA typ.).

Neglecting conditions outside the specified operating rat-

ings, maximum power dissipation of the LM2760 is approxi-

mately 70mW (V

IN

)3.4V, I

OUT

= 20mA, I

PUMP

= 0.3mA).

When the junction-to-ambient thermal resistance of the

LM2760 in the application is 220oC/W (matches JEDEC

JESD51-3), power dissipation results in a 15oC elevation

above ambient in the junction temperature of the part. Thus,

when the ambient temperature is 85oC, the junction tem-

perature of the LM2760 under these conditions will be

100oC. LM2760 performance limits are guaranteed over a

junction temperature range of 0oCto+70

oC. The LM2760

must be operated with a junction temperature within this

range for the guaranteed performance limits listed in this

datasheet to apply.

20044304

FIGURE 2. LM2760 Power Model

20044307

FIGURE 3.

20044305

FIGURE 4. LM2760 Power Efficiency vs. Input Voltage

(T

A

=25

oC)

LM2760

www.national.com9

Physical Dimensions inches (millimeters)

unless otherwise noted

5 Lead Small Outline Package (SOT-23-5)

MS05A

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whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

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www.national.com

LM2760 3.3V Regulated Switched Capacitor Voltage Converter

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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