G5111 Datasheet. Www.s Manuals.com. R1.1 Gmt

User Manual: Marking of electronic components, SMD Codes 52, 52**, 52***, 52-, 523A*, 5244x, 52AC, 52AI, 52BC, 52BI, 52CC, 52CI, 52DC, 52DI, 52EC, 52EI, 52FC, 52FI, 52GC, 52GI, 52HC, 52HI, 52IC, 52II, 52JC, 52JI, 52KC, 52KI, 52LC, 52LI, 52N03S, 52N50C3, 52W, 52p, 52t. Datasheets BSC052N03S G, DTA123YE, DTA123YKA, DTA123YUA, G5111T12, G5243AT11U, G5244T11U, ISL61852ACRZ, ISL61852AIRZ, ISL61852BCRZ, ISL61852BIRZ, ISL61852CCRZ, ISL61852CIRZ, ISL61852DCRZ, ISL61852DIRZ, ISL61852ECRZ, ISL61852EIRZ, ISL61852FCRZ, ISL61852FIRZ

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G5111

Global Mixed-mode Technology Inc.

Micro-power Step-Up DC/DC Converters in SOT23-5
Features

General Description

„Configurable Output Voltage Up to 28V
„20µA Quiescent Current
„<1µA Shutdown Current
„<1µA Shutdown Pin Current
„Supply Range from 2.5V to 6.5V
„Low VDS(on): 250mV (ISW=300mA)
„Tiny SOT23-5 Package

The G5111 boost converter is designed for small/ medium size LCD panel of high bias voltage.

Applications

Furthermore, the 350mA current limit, 500ns fixed
minimum off-time and tiny SOT23-5 package facilitates the use of smaller inductor and other surface-mount components to minimize the PCB size in
those space-conscious applications.

Due to a typical 20µA quiescent current and 2.5V~
6.5V supply voltage range, it is suitable for battery
powered portable applications. Such as PDAs and
Handheld Computers. When the IC sets to shutdown
mode, it only consumes less than 1µA.

„STN/TFT LCD Bias
„Personal Digital Assistants (PDAs)
„Handheld Computers
„Digital Still Cameras
„Cellular Phones
„WebPad
„White LED Driver
„Local 3V to 5V Conversion

To control the IC, no other external current is needed
for the shutdown pin. It typically consumes less than
1µA of full supply range.

Ordering Information
PART

TEMP.
RANGE

PINPACKAGE

TOP MARK

SOT23-5
SOT23-5

51xx
52xx

G5111 T11 -40°C ~ +85°C
G5111 T12 -40°C ~ +85°C

Pin Configuration

SW

1

Typical Application Circuit

5

VCC
10µH

GND 2

G5111 T11

G963

VCC
4

FB 3

SW

SHDN

1M

G5111

SOT23-5

SHDN
SHDN 1

VCC 2

20V
12mA

VIN
2.5V to 4.2V

5

FB

4

SW

4.7µF

1µF

FB

GND
62k

G5111 T12

G963
GND 3

SOT23-5

TEL: 886-3-5788833
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Ver: 1.1
Oct 02, 2002

1

G5111

Global Mixed-mode Technology Inc.
Absolute Maximum Ratings

Junction Temperature ......….......….........….........+125°C
Storage Temperature…………........….. –65°C to +150°C
Lead Temperature (Soldering, 10 sec).…………..+300°C

SW to GND…………………………………..-0.3V to +30V
FB to GND…………… ………………………..-0.3V to VCC
VCC, SHDN to GND.............................….....-0.3V to +7V
Operating Temperature Range (Note 1) ..-40°C to +85°C

Stress beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device.

Electrical Characteristics
(VCC = 3.6V, V SHDN = 3.6V, TA = 25°C)
PARAMETER

CONDITIONS

MIN

Input Voltage Range

TYP

2.5
Not Switching
V SHDN = 0V

Quiescent Current
FB Comparator Trip Point
Output Voltage Line Regulation
FB Pin Bias Current (Note 2)
Switch Off Time
Switch VDS(ON)
Switch Current Limit

1.18
2.5V 1V
VFB < 0.6V
ISW = 300mA
300

SHDN Pin Current

20
0.1
1.2
-0.05
30
500
1.6
250
350
0.1

MAX

UNITS

6.5
30
1
1.22

350
400

V
µA
µA
V
%/V
nA
ns
µs
mV
mA

1

µA

80

0.9

SHDN Input Voltage High

V

SHDN Input Voltage Low

Switch Leakage Current

Switch Off, VSW = 28V

0.01

0.25

V

5

µA

Note 1: The G5111 are guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the
-40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls.
Note 2: Bias current flows into the FB pin.

Block Diagram
L1
VIN

VOUT
C2

C1

BIAS
VOUT

R1

FB

+

SW

SHDN

VCC

SHUTDOWN
LOGIC
PUMP CONTROL
OC
DRIVER
COMP

ERROR
COMP
en_sw

+
R2

1.2V

T OFF PULSE
CONTROL

VREF

GND

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Ver: 1.1
Oct 02, 2002

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G5111

Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VCC=+3.6V, V SHDN =+3.6V, L=10µH, TA=25°C, unless otherwise noted.)

Output Voltage vs. Load Current
21

20.5

20.5

Output Voltage (V)

Output Voltage (V)

Output Voltage vs. Input Voltage
21

IOUT=1mA
20

IOUT=10mA

19.5

VIN=2.7V
20
VIN=4.2V
19.5

19

19
2.5

3

3.5

4

4.5

5

1

5.5

2

3

5

6

7

8

9

10

Quiescent Current vs. Temperature

Efficiency vs. Load Current
50

90

Quiescent Current (µA)

VIN=4.2V

85
80

Efficiency (%)

4

Load Current (mA)

Input Voltage (V)

VIN=3.6V

75
70

VIN=2.7V

65
60

40

VIN=4.2V

30

20

VIN=2.7V

55
10

50
0.1

1

10

-20

100

0

40

60

80

100

Feedback Voltage vs. Temperature

Vds_on vs. Temperature
1.22

Feedback Voltage (V)

500

Switch Vds_on (mV)

20

Temperature (°C)

Load Current (mA)

400
VIN=2.7V
300

200
VIN=4.2V
100

1.21
VIN=2.7V
1.2

1.19

VIN=4.2V

1.18
-20

0

20

40

60

80

-20

100

Temperature (°C)

0

20

40

60

80

100

Temperature (°C)

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G5111

Global Mixed-mode Technology Inc.
Typical Performance Characteristics (Continued)

FB Bias Current vs. Temperature

Switch Current Limit vs. Temperature
450

VIN=2.7V

Peak Current (mA)

Feedback Bias Current (nA)

30

25

20
VIN=4.2V

400

VIN=4.2V

350
VIN=2.7V

300

250

15
-20

0

20

40

60

80

-20

100

0

20

40

60

80

100

Temperature (°C)

Temperature (°C)

Line Transient

Load Transient

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G5111

Global Mixed-mode Technology Inc.
Pin Description
PIN

NAME

FUNCTION

4
3

SW
GND

Switch Pin. The drain of the internal NMOS power switch. Connect this pin to inductor.
Ground.
Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Block Diagram):

3

5

FB

4

1

SHDN

5

2

VCC

T11

T12

1
2

R1 = R2

VOUT
-1
1 .2

Active-Low Shutdown Pin. Tie this pin to logic-high to enable the device or tied it to logic-low
to turn this device off.
Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible.

Function Description

Where VD = 0.4V (Schottky diode voltage), ILIM =
350mA and tOFF = 500ns. A larger value can be used
to lightly increase the available output current, but limit
it to about twice the calculating value. When too large
of an inductor will increase the output voltage ripple
without providing much additional output current. In
varying VIN condition such as battery power applications, use the minimum VIN value in the above equation. A smaller value can be used to give smaller
physical size, but the inductor current overshoot will
be occurs (see Current Limit Overshoot section).

The G5111 is a boost converter with a NMOS
switch embedded (refer to Block Diagram). The
boost cycle is getting started when FB pin voltage
drop below 1.2V as the NMOS switch turns on.
During the switch on period, the inductor current
ramps up until 350mA current limit is reached. Then
turns the switch off, while the inductor current flows
through external schottky diode, and ramps down to
zero. During the switch off period, the inductor current charges output capacitor and the output voltage
is boosted up. This pumping mechanism continues
cycle by cycle until the FB pin voltage exceed 1.2V
and entering the none switching mode. In this mode,
the G5111 consumes as low as 20uA typically to
save battery power.

Inductor Selection—SEPIC Regulator
For a SEPIC regulator using the G5111, the approximate inductance value can be calculated by below
formula. As for the boost inductor selection, a larger or
smaller value can be used.

Applications Information

L=2

Choosing an Inductor
There are several recommended inductors that work
well with the G5111 in Table 1. Use the equations and
recommendations in the next few sections to find the
proper inductance value for your design.

PART

VALUE((µH) MAX DCR (Ω)
4.7
10
22
4.7
10
4.7
10
4.7
10
22

0.26
0.30
0.92
0.11
0.18
0.16
0.20
0.09
0.16
0.37

VENDOR
Murata
www.murata.com

IPEAK = ILIM +
Sumida
www.sumida.com

VIN(MAX) - VSAT
x 100ns
L

Where VSAT = 0.25V (switch saturation voltage). When
the systems with high input voltages and uses smaller
inductance value, the current overshoot will be most
apparent. This overshoot can be useful as it helps
increase the amount of available output current. To
use small inductance value for systems design, the
current limit overshoot can be quite high. Even if it is
internally current limited to 350mA, the power switch of
the G5111 can operate larger currents without any
problem, but the total efficiency will suffer. The IPEAK is
keep below 500mA for the G5111 will be obtained
best performance.

Coilcraft
www.coilcraft.com

Inductor Selection—Boost Regulator
The appropriate inductance value for the boost regulator application may be calculated from the following
equation. Select a standard inductor close to this
value.
L=

x tOFF

Current Limit Overshoot
The G5111 use a constant off-time control scheme,
the power switch is turned off after the 350mA current
limit is reached. When the current limit is reached and
when the switch actually turns off, there is a 100ns
delay time. During this time, the inductor current exceeds the current limit by a small amount. The formula
below can calculate the peak inductor current.

Table 1. Recommended Inductors
LQH3C4R7
LQH3C100
LQH3C220
CD43-4R7
CD43-100
CDRH4D18-4R7
CDRH4D18-100
DO1608-472
DO1608-103
DO1608-223

VOUT + VD
ILIM

VOUT-VIN(MIN)+VD
x tOFF
ILIM
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Ver: 1.1
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G5111

Global Mixed-mode Technology Inc.
Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors
should be used at the output to minimize the output
ripple voltage and the peak-to-peak transient voltage.
Multilayer ceramic capacitors (MLCC) are the best
choice, as they have a very low ESR and are available
in very small packages. Their small size makes them a
good match with the G5111’s SOT-23 package. If
solid tantalum capacitors (like the AVX TPS, Sprague
593D families) or OS-CON capacitors are used, they
will occupy more volume than a ceramic ones and the
higher ESR increases the output ripple voltage. Notice
that use a capacitor with a sufficient voltage rating.
A low ESR surface-mount ceramic capacitors also
make a good selection for the input bypass capacitor,
which should be placed as close as possible to the
G5111. A 4.7µF input capacitor is sufficient for most
applications.

recommended. Many different manufacturers make
equivalent parts, but make sure that the component is
rated to operate at least 0.35A. To achieve high efficiency, the average current rating of the Schottky diodes should be greater than the peak switching current. Choose a reverse breakdown voltage greater
than the output voltage.
Lowering Output Voltage Ripple
The G5111 supplies energy to the load in bursts by
ramping up the inductor current, then delivering that
current to the load. To use low ESR capacitors will
help minimize the output ripple voltage, but proper
selection of the inductor and the output capacitor also
plays a big role. If a larger inductance value or a
smaller capacitance value is used, the output ripple
voltage will increase because the capacitor will be
slightly overcharged each burst cycle. To reduce the
output ripple, increase the output capacitance value or
add a 10pF feed-forward capacitor in the feedback
network of the G5111 (see the circuits in the Typical
Applications section). To add this small, inexpensive
10pF capacitor will greatly reduce the output voltage
ripple.

Diode Selection
For most G5111 applications, the high switching frequency requires a high-speed rectifier Schottky diodes,
such as the Motorola MBR0530 (0.5A, 30V) with their
low forward voltage drop and fast switching speed, are

Typical Applications

Boost Converter

L1
4.7µH

SEPIC Converter

5V
50mA

VIN
2.5V to 4.2V
VCC

VCC

SW

G5111
SHDN
GND

D1

3.3V
60mA

VIN
2.5V to 4.2V
SW
L2
10µH

R1
390k

C1
4.7µF

C3
1µF

L1
10µH

D1

R1
470k

G5111

C2
22µF

SHDN

FB
C1
4.7µF

R2
120k

GND

C2
22µF
FB
R2
270k

L1,L2:MURATA LQH3C100K24
D1:MOTOROLA MBR0520

L1:MURATA LQH3C4R7M24
D1:MOTOROLA MBR0520

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G5111

Global Mixed-mode Technology Inc.
White LED Driver

L1
10µH/0.5A

D1

VBAT
2.5V~5.5V

MBR0530
C1
4.7µF

C2
1µF

SW

VCC

D2(Optional)
27V

G5111
ON/OFF Control

FB

SHDN

GND

R2
120k_1%

R3
VBIAS(+3.3V)

R1
30_1%

308k_1%

PWM Dim

R4
660k_1%

Dimming Ratio>50:1
Drive 2~8 White LEDs

PWM Dimming Control
VH=3.3V
VL=0V
Freq=160~240Hz

TEL: 886-3-5788833
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Ver: 1.1
Oct 02, 2002

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G5111

Global Mixed-mode Technology Inc.
Package Information

C

D

L

E

H

θ1

e1
e

A
A2
A1

b

Note:
1.
2.
3.
4.

Package body sizes exclude mold flash protrusions or gate burrs
Tolerance ±0.1000 mm (4mil) unless otherwise specified
Coplanarity: 0.1000mm
Dimension L is measured in gage plane
SYMBOLS
A
A1
A2
b
C
D
E
e
e1
H
L
θ1

DIMENSIONS IN MILLIMETERS
MIN

NOM

MAX

1.00
0.00
0.70
0.35
0.10
2.70
1.40
--------2.60
0.37
1º

1.10
----0.80
0.40
0.15
2.90
1.60
1.90(TYP)
0.95
2.80
-----5º

1.30
0.10
0.90
0.50
0.25
3.10
1.80
--------3.00
----9º

Taping Specification

Feed Direction
SOT23-5 Package Orientation

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

TEL: 886-3-5788833
http://www.gmt.com.tw

Ver: 1.1
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