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AP65201
TSOT26 LIGHT LOAD IMPROVED 2A SYNCH DC/DC BUCK CONVERTER

Description

Pin Assignments

The AP65201 is a 500kHz switching frequency internal compensated
synchronous DC/DC buck converter. It has integrated low RDS(ON)

ADVANCED INFORMATION

high and low side MOSFETs.

Top View

The AP65201 enables continuous load current of up to 2A with
efficiency as high as 97%.
The AP65201 implements an automatic custom light load efficiency
improvement algorithm.

GND

1

6

BST

SW

2

5

EN

IN

3

4

FB

The AP65201 features current mode control operation, which enables
fast transient response times and easy loop stabilization.
The AP65201 simplifies board layout and reduces space
requirements with its high level of integration and minimal need for
external components, making it ideal for distributed power
architectures.

TSOT26

The AP65201 is available in a standard Green TSOT26 package and
is RoHS compliant.

Features

Applications



VIN 4.5V to 16V






2A Continuous Output Current, 3A Peak
Efficiency Up to 97%
Automated Light Load improvement
VOUT Adjustable from 0.8V









500kHz Switching Frequency
Internal Soft-Start
Enable Pin
Overcurrent Protection (OCP) with Hiccup
Thermal Protection
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)











Notes:

Gaming Consoles
Flat Screen TV Sets and Monitors
Set-Top Boxes
Distributed Power Systems
Home Audio
Consumer Electronics
Network Systems
FPGA, DSP and ASIC Supplies
Green Electronics

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.

Typical Applications Circuit

INPUT

6
BST

3
IN

VIN
12V

ON
OFF

5
EN

C5
1µF
2
SW

4
FB

OUTPUT
VOUT
3.3V

AP65201

C1
22μF

L1
4.7μH

R1
40.2kΩ
R3
75kΩ

R2
13kΩ

C2
22μF

1
GND

Figure 1. Typical Application Circuit

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AP65201
Pin Descriptions

GND

Pin Number
TSOT26
1

SW

2

IN

3

FB

4

EN

5

BST

6

Function
Ground
Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC
filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.5V
to 16V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
See Input Capacitor.
Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider
connected to it from the output voltage. The feedback threshold is 0.8V. See Setting the Output Voltage.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator; low to
turn it off. Attach to IN with a 100kΩ pull up resistor for automatic startup.
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET a 0.01µF or
greater capacitor from SW to BS to power the high side switch.

Functional Block Diagram
0.3V
0.8V
1.1V

INTERNAL
REFERENCE

EN

Vcc
REGULATOR
+
IN

OVP
RAMP

1.1V

OSCILLATOR

E

CURRENT
SENSE
AMPLIFIER

-

+

FB

+

ADVANCED INFORMATION

Pin
Name

500KHz
CLK

BST

Logic

0.3 V
+
Internal
SS

+

SW
-

+

CURRENT
COMPARATOR

0.8 V
GND

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AP65201
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4)

ADVANCED INFORMATION

Symbol

Parameter

Unit

-0.3 to 20

V

VIN
VSW

Switch Node Voltage

-1.0 to VIN +0.3

V

VBS

Bootstrap Voltage

VSW -0.3 to VSW +6.0

V

VFB

Feedback Voltage

-0.3V to +6.0

V

VEN

Enable/UVLO Voltage

-0.3V to +6.0

V

TST

Storage Temperature

-65 to +150

°C

TJ

Junction Temperature

+160

°C

+260

°C

2.5
1

KV
KV

Lead Temperature
TL
ESD Susceptibility (Note 5)
HBM
Human Body Model
CDM
Charged Device Model
Notes:

Rating

Supply Voltage

4. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may
be affected by exposure to absolute maximum rating conditions for extended periods of time.
5. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when
handling and transporting these devices.

Thermal Resistance (Note 6)

Note:

Symbol

Parameter

Rating

Unit

θJA

Junction to Ambient

TSOT26

120

°C/W

θJC

Junction to Case

TSOT26

30

°C/W

6. Test condition for SOT26: Device mounted on FR-4 substrate, single-layer PC board, 2oz copper, with minimum recommended pad layout

Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) (Note 7)
Symbol

Note:

Parameter

Min

Max

Unit

VIN

Supply Voltage

4.5

16

V

TA

Operating Ambient Temperature Range

-40

+85

°C

7. The device function is not guaranteed outside of the recommended operating conditions.

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AP65201
Electrical Characteristics
Symbol

Parameter

Test Conditions

Min

VEN = 0V

—

Supply Current (Quiescent)

VEN = 2.0V, VFB = 0.85V

—

RDS(ON)1

High-Side Switch On-Resistance (Note 8)

—

RDS(ON)2

Low-Side Switch On-Resistance (Note 8)

—

HS Current Limit (Note 8)

Minimum duty cycle

ISHDN
IQ

ADVANCED INFORMATION

(@TA = +25°C, VIN = 12V, unless otherwise specified.)

ILIMIT

Shutdown Supply Current

Typ

Max

Unit

1.0

µA

0.83

—

mA

—

160

—

mΩ

—

85

—

mΩ

2.8

3.5

—

A

High-Side Switch Leakage Current

VEN = 0V, VSW =12V

—

—

1

μA

FSW

Oscillator Frequency

VFB = 0.75V

400

500

600

kHz

DMAX

Maximum Duty Cycle

VFB = 700mV

88

92

—

%

TON

Minimum On Time

—

—

90

—

nS

VFB

Feedback Voltage

TA = -40°C to +85°C

776

800

824

mV

VEN_RISING

EN Rising Threshold

—

1.4

1.5

1.6

V

VEN_FALLING

EN Falling Threshold

—

ISW_LKG

EN Input Current

IEN

1.23

1.32

1.41

V

VEN = 2V

—

2.85

—

μA

VEN = 0V

—

0

—

μA

INUVVTH

VIN Undervoltage Threshold Rising

—

3.7

4.05

4.4

V

INUVHYS

VIN Undervoltage Threshold Hysteresis

—

—

250

—

mV

Soft-Start Period

—

—

1

—

mS

TSHDN

Thermal Shutdown (Note 8)

—

—

+160

—

°C

THYS

Thermal Hysteresis (Note 8)

—

—

+20

—

°C

TSS

Note:

8. Guaranteed by design.

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ADVANCED INFORMATION

Typical Performance Characteristics (@TA = +25°C, VIN = 12V, VOUT = 3.3V, L = 4.7µH, unless otherwise specified)

VIN=6.5V

VIN=4.7V

VIN=12V

VIN=12V

VIN=16V

VIN=16V

VIN=4.7V

VIN=4.7V
VIN=12V

VIN=12V
VIN=16V
VIN=16V

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ADVANCED INFORMATION

Typical Performance Characteristics (cont.) (@TA = +25°C, VIN = 12V, VOUT = 3.3V, L = 4.7µH, unless otherwise specified.)

VIN=4.7V

VIN=4.7V
VIN=12V

VIN=12V
VIN=16V

VIN=16V

VIN=16V

IOUT=2A
IOUT=1.5A

VIN=12V

IOUT=0A

VIN=4.7V

AP65201
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AP65201
Typical Performance Characteristics (cont.) (@T

A

ADVANCED INFORMATION

Startup Through VEN 2A Load

= +25°C, VIN = 12V, VOUT = 3.3V, L = 4.7µH, C1 = 22µF, C2 = 22µF, unless otherwise specified.)

Startup Through VIN 2A Load

VEN (5V/DIV)

VIN (12V/DIV)

VOUT (3.3V/DIV)

VOUT (3.3V/DIV)

IOUT (2A/DIV)

IOUT (2A/DIV)

SW (10V/DIV)

SW (10V/DIV)

Short Circuit Test

VOUT (2V/DIV)

IOUT (2A/DIV)

Time-1ms/div

Time-1ms/div

Time-5ms/div

Shutdown Through VEN 2A Load

Shutdown Through VIN 2A Load

Short Circuit Recovery

VEN (5V/DIV)

VIN (12V/DIV)
VOUT (2V/DIV)

VOUT (3.3V/DIV)

VOUT (3.3V/DIV)

IOUT (2A/DIV)

IOUT (2A/DIV)

SW (10V/DIV)

SW (10V/DIV)

IOUT (2A/DIV)

Time-50µs/div

Time-200µs/div

Startup Through VEN 0A Load

Startup Through VIN 0A Load

VEN (5V/DIV)

Time-5ms/div
Transient Response (1 to 2A)
VOUT_AC (200mV/DIV)

VIN (12V/DIV)

VOUT (3.3V/DIV)
VOUT (3.3V/DIV)
IOUT (100mA/DIV)

IOUT (100mA/DIV)

SW (10V/DIV)

SW (10V/DIV)

Time-1ms/div

Time-1ms/div
Shutdown Through VEN 0A Load

IOUT (1A/DIV)

Time-100µs/div

Shutdown Through VIN 0A Load

Input/Output Ripple (IO=2A)
VOUT_AC (200mV/DIV)

VEN (5V/DIV)

VIN (12V/DIV)
VIN_AC (200mV/DIV)

VOUT (3.3V/DIV)

VOUT (3.3V/DIV)

IOUT (100mA/DIV)

IOUT (100mA/DIV)

SW (10V/DIV)

SW (10V/DIV)

SW (10V/DIV)

IL (2A/DIV)

Time-500ms/div

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AP65201
Application Information
Theory of Operation

ADVANCED INFORMATION

The AP65201 is a 2A current mode control, synchronous buck regulator with built-in power MOSFETs. Current mode control assures excellent
line and load regulation and a wide loop bandwidth for fast response to load transients. Figure 1 depicts the functional block diagram of
AP65201.
The operation of one switching cycle can be explained as follows: The rising edge of the 500kHz oscillator clock signal sets the RS Flip-Flop. Its
output turns on HS MOSFET. When the HS MOSFET is on, inductor current starts to increase. The current sense amplifier senses and amplifies
the inductor current. Since the current mode control is subject to sub-harmonic oscillations that start at half of the switching frequency, ramp
slope compensation is utilized. This will help to stabilize the power supply. This ramp compensation is summed to the current sense amplifier
output and compared to the error amplifier output by the PWM comparator. When the sum of the current sense amplifier output and the slope
compensation signal exceeds the EA output voltage, the RS Flip-Flop is reset and HS MOSFET is turned off.
When the HS MOSFET turns off, the synchronous LS MOSFET turns on until the next clock cycle begins. There is a “dead time” between the HS
turn off and LS turn on that prevents the switches from “shooting through” from the input supply to ground.
For one whole cycle, if the sum of the current sense amplifier output and the slope compensation signal does not exceed the EA output, then the
falling edge of the oscillator clock resets the Flip-Flop, and forces the MOSFET to turn off.
The voltage loop is compensated internally.

Enable
The enable (EN) input allows the user to control turning on or off the regulator. The AP65201 has an internal pull down resistor on the EN pin
and when the EN is not actively pulled up the part turns off.

Quiescent Current
Above the ‘EN Rising Threshold’, the internal regulator is turned on and the quiescent current can be measured above this threshold.

Automated No-Load and Light-Load Operation
The AP65201 operates in light load high efficiency mode during low load current operation. The advantage of this light load efficiency mode is
lower power losses at no-load and light-load conditions. The AP65201 automatically detects the peak inductor current and enters the light load
high efficiency mode when the inductor peak current goes below 500mA. Once the inductor peak current exceeds this level, the AP65201
transitions from light load high efficiency mode to continuous PWM mode.

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Application Information (continued)

ADVANCED INFORMATION

Current Limit Protection
In order to reduce the total power dissipation and to protect the application, AP65201 has cycle-by-cycle current limiting implementation. The
voltage drop across the internal high-side MOSFET is sensed and compared with the internally set current limit threshold. This voltage drop is
sensed at about 30ns after the HS turns on. When the peak inductor current exceeds the set current limit threshold, current limit protection is
activated. When the voltage at the FB pin reaches 0.2V the device enters Hiccup mode to periodically restart the part. This protection mode
greatly reduces the power dissipated on chip and reduces the thermal issue to protect the device. AP65201 will exit Hiccup mode when the over
current situation is resolved.

Undervoltage Lockout (UVLO)
Undervoltage Lockout is implemented to prevent the IC from insufficient input voltages. The AP65201 has a UVLO comparator that monitors the
input voltage and the internal bandgap reference. If the input voltage falls below 4.4V, the AP65201 will latch the undervoltage fault. In this event,
the output will be pulled low and power has to be re-cycled to reset the UVLO fault.

Overvoltage Protection
When the AP65201 FB pin exceeds 115% of the nominal regulation voltage of 0.8V, the overvoltage comparator is tripped.

Thermal Shutdown
The AP65201 has on-chip thermal protection that prevents damage to the IC when the die temperature exceeds safe margins. It implements a
thermal sensing to monitor the operating junction temperature of the IC. Once the die temperature rises to approximately +160°C, the thermal
protection feature gets activated. The internal thermal sense circuitry turns the IC off thus preventing the power switch from damage. A
hysteresis in the thermal sense circuit allows the device to cool down to approximately +120°C before the IC is enabled again through soft start.
This thermal hysteresis feature prevents undesirable oscillations of the thermal protection circuit.

Setting the Output Voltage
The output voltage can be adjusted from 0.8V using an external resistor divider. Table 1 shows a list of resistor selection for common output
voltages. Resistor R1 is selected based on a design tradeoff between efficiency and output voltage accuracy. For high values of R1 there is less
current consumption in the feedback network. R1 can be determined by the following equation:

V

R 1  R 2   OUT  1
 0.8


R1

RT

FB

Vout

R2

VOUT (V)

R1 (kΩ)

R2 (kΩ)

RT (kΩ)

L1 (µH)

1.05
1.2
1.8
2.5
3.3
5

10
20.5
40.2
40.2
40.2
40.2

32.4
41.2
32.4
19.1
13
7.68

300
249
120
100
75
75

1.5
1.5
2.2
2.2
4.7
6.5

Figure 2. Feedback Divider Network

AP65201
Document number: DS36109 Rev. 2 - 2

Table 1. Recommended Component Selection

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AP65201
Application Information (cont.)
Inductor

ADVANCED INFORMATION

Calculating the inductor value is a critical factor in designing a buck converter. For most designs, the following equation can be used to calculate
the inductor value;
L

VOUT  (VIN  VOUT )
VIN  ΔIL  fSW

Where ΔIL is the inductor ripple current and fSW is the buck converter switching frequency.
Choose the inductor ripple current to be 30% of the maximum load current. The maximum inductor peak current is calculated from:
IL(MAX)  ILOAD 

ΔIL
2

Peak current determines the required saturation current rating, which influences the size of the inductor. Saturating the inductor decreases the
converter efficiency while increasing the temperatures of the inductor and the internal MOSFETs. Hence choosing an inductor with appropriate
saturation current rating is important.
A 1µH to 10µH inductor with a DC current rating of at least 25% higher than the maximum load current is recommended for most applications.
For highest efficiency, the inductor’s DC resistance should be less than 20mΩ. Use a larger inductance for improved efficiency under light load
conditions.

Input Capacitor
The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. The input capacitor has to
sustain the ripple current produced during the on time on the upper MOSFET. It must hence have a low ESR to minimize the losses.
The RMS current rating of the input capacitor is a critical parameter that must be higher than the RMS input current. As a rule of thumb, select an
input capacitor which has RMs rating that is greater than half of the maximum load current.

Input Capacitor
The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. The input capacitor has to
sustain the ripple current produced during the on time on the upper MOSFET. It must hence have a low ESR to minimize the losses.
The RMS current rating of the input capacitor is a critical parameter that must be higher than the RMS input current. As a rule of thumb, select an
input capacitor which has RMs rating that is greater than half of the maximum load current.
Due to large dI/dt through the input capacitors, electrolytic or ceramics should be used. If a tantalum must be used, it must be surge protected.
Otherwise, capacitor failure could occur. For most applications, a 10/22µF ceramic capacitor is sufficient.

Output Capacitor
The output capacitor keeps the output voltage ripple small, ensures feedback loop stability and reduces the overshoot of the output voltage. The
output capacitor is a basic component for the fast response of the power supply. In fact, during load transient, for the first few microseconds it
supplies the current to the load. The converter recognizes the load transient and sets the duty cycle to maximum, but the current slope is limited
by the inductor value.
Maximum capacitance required can be calculated from the following equation:
ESR of the output capacitor dominates the output voltage ripple. The amount of ripple can be calculated from the equation below:

Vout capacitor  ΔIinductor * ESR
An output capacitor with ample capacitance and low ESR is the best option. For most applications, a 22µF ceramic capacitor will be sufficient.

ΔIinductor 2
)
2
Co 
(Δ V  Vout )2  Vout2
L(Iout 

Where ΔV is the maximum output voltage overshoot.

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AP65201
Application Information (cont.)
PC Board Layout

ADVANCED INFORMATION

This is a high switching frequency converter. Hence, attention must be paid to the switching currents interference in the layout. Switching current
from one power device to another can generate voltage transients across the impedances of the interconnecting bond wires and circuit traces.
These interconnecting impedances should be minimized by using wide, short printed circuit traces.

Figure 3—PC Board Layout

External Bootstrap Diode
It is recommended that an external bootstrap diode be added when the input voltage is no greater than 5V or the 5V rail is available in the
system. This helps to improve the efficiency of the regulator. This solution is also applicable for D > 65%. The bootstrap diode can be a low cost
one such as BAT54 or a Schottky that has a low VF.

5V
BST
AP65201

BOOST
DIODE
10nF

SW
Figure 4—External Bootstrap Compensation Components

Recommended Diodes:
Voltage/Current
Part Number
Rating
B130
30V, 1A
SK13
30V, 1A

AP65201
Document number: DS36109 Rev. 2 - 2

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AP65201
Ordering Information

Package

Packing

WU : TSOT26

7 : Tape & Reel

Part Number

Package Code

Package

Identification Code

AP65201WU-7

WU

TSOT26

SA

Tape and Reel
Quantity
Part Number Suffix
3,000
-7

Marking Information
TSOT26

( Top View )
6

5

4

7

ADVANCED INFORMATION

AP65201WU - 7

XX Y W X

1

AP65201
Document number: DS36109 Rev. 2 - 2

2

3

XX : Identification Code
Y : Year 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : Internal Code

Part Number

Package

Identification Code

AP65201WU-7

TSOT26

SA

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AP65201
Package Outline Dimensions
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version.
TSOT26

ADVANCED INFORMATION

D
e1

TSOT26
Dim
Min
Max
Typ
A
1.00


A1
0.010 0.100

A2
0.840 0.900

D
2.800 3.000 2.900
E
2.800 BSC
E1
1.500 1.700 1.600
b
0.300 0.450

c
0.120 0.200

e
0.950 BSC
e1
1.900 BSC
L
0.30
0.50
L2
0.250 BSC
θ
0°
8°
4°
θ1
4°
12°

All Dimensions in mm

01(4x)

E1/2
E/2
E1

c

E

Gauge Plane

0
L

L2

01(4x)

b

e

Seating Plane

A2
A1

A

Seating Plane

Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
TSOT26

C

Dimensions Value (in mm)
C
0.950
X
0.700
Y
1.000
Y1
3.199

Y1

Y
X

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AP65201
IMPORTANT NOTICE

ADVANCED INFORMATION

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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2015, Diodes Incorporated
www.diodes.com

AP65201
Document number: DS36109 Rev. 2 - 2

14 of 14
www.diodes.com

September 2015
© Diodes Incorporated

www.s-manuals.com



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