3A Ultra Low Dropout Linear Regulator

GS7103

Features

General DescriptionMaximum 3A Low-Dropout Voltage Regulator

The GS7103 can deliver up to 3A of continuous

Ultra Low Dropout Voltage

output current with a typical dropout voltage of

Typically 220mV at 3A Output Current

only 260mV using internal n-channel MOSFETs.

High Output Accuracy over Line, Load and

The linear regulator uses a separate VDD supply

Temperature

to power the control circuitry and drive the Inter-

Build-In Soft-Start

nal n-channel MOSFETs. The output voltage isExcellent startup under load from 0 to 3A

adjustable from 0.8V to the voltage that is very

Power-On-Reset Monitoring on Both VDD andclose to VIN.

VIN Pins

The GS7103 allows the use of low-ESR ceramicPower-OK Output function

capacitor as low as 10uF. Moreover the ICFoldback over Current Protection andprovide good performance on both line transient

Thermal shutdown

response and load transient response.



0.1μA (typ) Shutdown Supply Current

The GS7103 provides foldback over current limit

Low ESR Output Capacitor(Multi-layer Chip

and thermal shutdown to prevent the linear

Capacitors (MLCC)) Applicableregulator



Vout Pull Low Resistance when Disable

minimizes stress on the input power source byPSOP-8, TDFN10-3x3

reducing capacitive inrush current on start-up.

Green Product (RoHS, Lead-Free,

During start-up, POK remain low until the output

Halogen-Free Compliant)reaches 92% of its rating value.



from

damage.

Built-insoft-start

The GS7103 is available in PSOP-8 package orApplications
Notebook PC Applications

Motherboard Applications



Low Voltage Logic Supplies

Microprocessor and Chipset Supplies

Graphic Cards



Cordless phones

TDFN10-3x3 package.

This document is GStek's confidential information. Anyone having confidential obligation to GStek shall keep this document confidential. Any unauthorized
disclosure or use beyond authorized purpose will be considered as violation of confidentiality and criminal and civil liability will be asserted.

Green Solution Technology Co.,LTD.
Rev.:1.6

1JUN-16

3A Ultra Low Dropout Linear Regulator

GS7103

Typical Application

Figure 1 Typical Application of GS7103

Function Block Diagram

VIN

3

VDD

4

POR

VOUT

7

FB

1

POK

8

GND

OCP
Error
Error
Amplifier
AMP

Soft
Start
Error
AMP

OTP

EN

6

2

Delay

400K
92%*VREF

Figure 2 Function Block Diagram

Green Solution Technology Co.,LTD.
Rev.:1.6

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3A Ultra Low Dropout Linear Regulator

GS7103

Pin Configuration
POK

GND

EN

FB

VOUT

VDD

VOUT

VIN

VOUT

GND
VIN

VOUT

VDD

NC

PSOP-8

GND

VIN

FB

VIN

POK

EN

TDFN10-3x3

Pin Descriptions
Pin No.
Name

I/O type

PSOP-8

TDFN10-3x3

1

5

POK

O

2

6

EN

I

3

7,8,9

VIN

I

4

10

VDD

I

5
6

1,2,3

NC
VOUT

O

7

4

FB

I

8

11

GND

I

Green Solution Technology Co.,LTD.
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Pin Function

Open drain output. Setting high impedance once
VOUT reaches 92% of its rating voltage
Chip Enable (active high). The device will be
shutdown if this pin is left open.
Input Voltage. Large bulk capacitance should beplaced closely to this pin. A 10μF ceramic
capacitor is recommended at this pin.
Supply voltage for control circuit. A 3V to 5V
supply voltage for control circuit is recommended
and supply voltage should be 1.5V higher than the
output voltage.
Not connected
Output Voltage. The power output of the device.
Feedback Voltage. This pin is connected to thecenter tap of an external resistor divider network to
set the output voltage as VOUT = 0.8(R1+R2)/R2.
Ground.

JUN-16

3A Ultra Low Dropout Linear Regulator

GS7103

Ordering Information
GS7103PP- R
1. Package

No

Item

1

Package

2

Shipping

2. Shipping

Contents
SO: PSOP-8(B)
TD: TDFN10-3x3
R: Tape & Reel

Example: GS7103 PSOP-8(B) Tape & Reel ordering information is “GS7103SO-R”

Absolute Maximum Rating (Note 1)
Parameter

SymbolLimitsUnits

Supply Voltage

VIN-0.3 < VIN< 6V

Control Voltage

VDD-0.3 < VDD< 6V

Output Voltage

VOUT-0.3 < VOUT<5

V

Package Power Dissipation at TA ≦25°C

PD_PSOP-8

1333

mW

Package Power Dissipation at TA ≦25°C

PD_TDFN10-3x3

1670

mW

Junction Temperature

TJ- 45 ~ 150°C

Storage Temperature

TSTG- 65 ~ 150°C

Lead Temperature (Soldering) 10S

TLEAD

260

°C

ESD (Human Body Mode) (Note 2)

VESD_HBM

2K

V

ESD (Machine Mode) (Note 2)

VESD_MM

200

V

Parameter

SymbolLimits

Units

Thermal Resistance Junction to AmbientθJA_PSOP-8

75

°C/W

Thermal Resistance Junction to Case

θJC_PSOP-8

12

°C/W

Thermal Resistance Junction to AmbientθJA_TDFN10-3x3

60

°C/W

Thermal Resistance Junction to Case

θJC_TDFN10-3x3

5

°C/W

Thermal Information (Note 3)

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JUN-16

3A Ultra Low Dropout Linear Regulator

GS7103

Recommend Operating Condition (Note 4)
Parameter

SymbolLimitsUnits

Supply Voltage

VIN

1.0 < VIN< Min{5.2,VDD}

V

Control Voltage

VDD

3.0 < VDD< 5.5

V

Junction Temperature

TJ- 40 ~ 125°C

Ambient TemperatureTA- 40 ~ 85°CElectrical Characteristics(VIN= VOUT+0.5V, VEN=VDD=5V, CIN=COUT=10uF, TA=TJ=25°C)

Parameter

SymbolConditions

Min.

Typ.

Max.

Units

Supply Voltage Section
VDD Operation Voltage
Range

VDD

VDD Input Range, VOUT=VREF

3.0

5.5

V

VIN Operation Voltage
Range

VIN

VIN Input Range, VOUT=VREF

1.0

Min{5.2,VDD}

V

Quiescent current

IQ

VDD=VIN=VEN=5V,IOUT=0A,
VOUT=VREF

1.0

1.5

mA

VDD Input current

IVDD

1.0

1.5

mA

Control Input Current
in Shutdown

IVDD_SD

0.1

2

uA

VDD POR Threshold

VDDRTH

2.4

2.7

3

V

0.15

0.2

0.55

0.75

0.13

0.20

0.784

0.8

VDD=VIN=VEN=5V, IOUT=0A,
VOUT=VREF
VDD=VIN=5.0V, IOUT=0A,
VEN=0VVDD POR Hysteresis
VIN POR Threshold

VINRTH

VIN POR Hysteresis

V
0.95

V
V

Output Voltage
Reference Voltage

VREF

IOUT=1mA, VOUT=VREF

0.816

V

+2.0

%

0.03

0.2

%

0.01

0.1

%

IOUT=1mA to 3 A, VOUT=VREF

0.1

1.5

%

VDD=VIN=5.0V, VEN=0V

130

Output Voltage
Accuracy-2.0Line Regulation (VDD)△ VLINE_VDDLine Regulation (VIN)△ VLINE_IN

Load Regulation(Note 5)
VOUT Pull Low
Resistance△ VLOAD

VDD=4V to 5V, IOUT=1mA,
VOUT=VREF, VIN=2V
VIN=1.2V to 5V, IOUT=1mA,
VOUT=VREF

Green Solution Technology Co.,LTD.
Rev.:1.6

5ΩJUN-16

3A Ultra Low Dropout Linear Regulator

GS7103

Dropout Voltage
Dropout Voltage(Note 6)VDROP

VOUT=VREF, IOUT=2A

160

200

mV

VOUT= VREF, IOUT=3A

220

290

mV

Protection
Current LimitILIM

VDD=VIN=VEN=5V, VOUT= VREF

4

A

Short Circuit Current

IFOLDBACKVOUT<0.2V

100

mA

Thermal Shutdown
Temperature

TSD

TJ Rising

150

°C

100

°C

Thermal Shutdown
Returned Temperature

EnableEN
Threshold

Logic-Low
Voltage
Logic-High
Voltage

EN Input Bias Current

VDD=5V

0.7

VDD=5V
IEN

1.4

V
V

VEN=5V

12

20

uA

POK Rising Threshold

VREF Rising

92%

POK Hysteresis

VREF falling

8%

POK Sink Capability

IPGOOD=1mA

0.2

POK Delay-40°C ~125°C

1.3

Power OK

0.4

V
mS

Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to thedevice. These are for stress ratings. Functional operation of the device at these or any otherconditions beyond those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may remain possibility toaffect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. θJA is measured in the natural convection at TA=25°C on a high effective thermal conductivity
test board (4 Layers, 2S2P) of JEDEC 51-7 thermal measurement standard. The case point of
θJC is on the expose pad for PSOP-8 package.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices
are tested for load regulation in the load range from 1mA to 3A.
Note 6. The Dropout voltage is defined as VIN-VOUT, which is measured when VOUT is 0.98*VOUT(NORMAL).
The Dropout voltage is measured at constant junction temperature by using a 2ms current pulse.

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3A Ultra Low Dropout Linear Regulator

GS7103

Typical Characteristics
VIN Line Transient Response

VIN Line Transient Response

VOUT=1.2V, IOUT=0

VOUT=1.2V,IOUT=1A

VDD Line Transient Response

VDD Line Transient Response

VOUT=1.2V,IOUT=0

VOUT=1.2V, IOUT =1A

Load Transient Response

Power On from VIN

VOUT=1.2V, COUT=22uF

VDD=5V, VOUT=1.6V, COUT=(1000+10)uF,no load

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3A Ultra Low Dropout Linear Regulator

GS7103

Power On from VDDTurn On from EN

VDD=5V, VOUT=1.6V, COUT=(1000+10)uF,no load

VEN=5V, VOUT=1.6V, COUT=(1000+10)uF,no load

Turn On from EN

Turn On from EN

VEN=5V, VOUT=1.6V, COUT=10uF, Iload =3A

VEN=5V, VOUT=1.6V, COUT=10uF, Rload =0.5

Output Short Current

Output Short Current

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3A Ultra Low Dropout Linear Regulator

GS7103

Dropout Voltage vs. Output Current

Shutdown Current vs. Input Voltage

Quiescent Current vs. Input Voltage

On Resistance vs. Temperature

Quiescent Current vs. Temperature

FB Voltage vs. Temperature

Green Solution Technology Co.,LTD.
Rev.:1.6

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3A Ultra Low Dropout Linear Regulator

GS7103

Application Information
EnableCurrent Limit

The GS7103 has a dedicated enable pin(EN).

The GS7103 contains a foldback over current

When the EN pin is in the logic low (VEN<0.6V),

protection function. It allows the output current to

the regulator will be turned off, reducing thereach the maximum value of 4A. Then further

supply current to less than 1uA.

decreases in the load resistance reduce both the

When the EN pin is in the logic high (VEN>1.4V),

load current and the load voltage. The main

the regulator will be turned on and undergoes aadvantage of foldback limiting is less power

new soft-start cycle. Left open, the EN pin isdissipation in the pass transistor under shorted-

pulled down by a internal resistor to shut download conditions. During startup, the current limit

the regulator.

value is set to a high value, thus GS7103 canPower-on-Reset

operate in full load condition. After startup, the

The GS7103 features a power-on-reset control

current limit value is set to a normal value, so thethrough monitor both input voltages to prevent

pass transistor can be protected well.

wrong operations. Only after the two supply

Thermal-Shutdown Protection

voltages exceed their rising POR threshold

Thermal Shutdown protects GS7103 from ex-

voltages, the regulator is to be initiated and starts

cessive power dissipation. If the die temperatureup.

exceeds 150°C, the pass transistor is shut off.

POK

50°C of hysteresis prevents the regulator fromThe POK pin is an open-drain output, and can beturning on until the die temperature drops toconnects to VOUT or other rail through an external

100°C.

pull-up resistor. As the output voltage arrives 92%

Output Capacitor selectionof normal output voltage, an internal delay

The GS7103 is designed to employ ceramic

function starts to perform a delay time and thenoutput capacitors as low as 10uF; if employ EL

output the POK pin high to indicate the output is

output capacitor as large as 1000uF, feedback

OK. As the output voltage falls below the falling

resistance(Rbottom) should be larger than 100K

Power-OK threshold or one of the two supply

ohm(Table 2). Place the capacitors physically as

voltages falls below it’s falling POR threshold, theclose as possible to the device with wide and

POK pin will output low immediately without adirect PCB traces. Capacitor ESR should be lessdelay time.

than 50mohm.

Build-In Soft-Start

Cout

Rbottom

An internal soft-start function controls rise rate of

Ceramic≥10uF≥0.1KΩ

the output voltage to limit the current surge at

EL

1000uF≥100KΩ

start-up. The typical soft-start interval is about

Table 1 Cout capacitor vs. Rbottom resistance

3mS.

Green Solution Technology Co.,LTD.
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3A Ultra Low Dropout Linear Regulator

GS7103

Feedback Network

keep

Figure 3 shows the feedback network. The

maximum operation junction temperature 125°C

suggested

for maximum reliability.

designprocedureistochoosethejunction

temperature

below

R2=10KΩ and then calculate R1 using the

The power dissipation definition in device is:following formula: R1=(VOUT / VREF -1)*R2.

PD = (VIN − VOUT) x IOUT + VDD x IQ
Themaximum

power

dissipation

can

the

be

calculated as:
PD(MAX) = ( TJ(MAX) − TA ) / θJA
Where TJ(MAX) is the maximum operation junction
temperature

125°C,

TA

is

the

ambient

temperature and the θJA is the junction to ambient
thermal resistance.

Figure 3 Feedback Network

COPTION can improve transient response, and

The thermal resistance θJA for PSOP-8 package

recommend value as follow:

is 75°C/W on the standard JEDEC 51-7 (4 layers,

VOUT

R1

COPTION

2S2P) thermal test board. The copper thickness

0.8V ~ 1.6V

0 ~ 10 KΩ

470pF~1nF

is 2oz. The maximum power dissipation at TA =1.6V ~ 2.4V

10 KΩ ~ 20 KΩ

100pF~500pF

25°C can be calculated by following formula:

2.4V ~ 3.6V

20 KΩ ~ 30 KΩ

20pF~300pF

PD(MAX) = (125°C − 25°C) / (75°C/W) = 1.33W(SOP-8 Exposed Pad on the minimum layout)

Table 2 R1 vs. COPTION

Input Capacitor selection

The thermal resistance θJA for TDFN10-3x3

Bypass VIN to ground with a 10uF or greater

package is 60°C/W on the standard JEDEC 51-7

capacitor. Bypass VDD to ground with a 1uF(4 layers, 2S2P) thermal test board. The

capacitor for normal operation in most appli-

maximum power dissipation at TA = 25°C can becations. Ceramic, tantalum or aluminum elec-

calculated by following formula:trolytic capacitors may be selected for input

PD(MAX) = (125°C − 25°C) / (60°C/W) = 1.67W

capacitor.

are

The thermal resistance θJA of PSOP-8 isrecommended due to their significant cost anddetermined by the package design and the PCB

space savings. Place the capacitors physically as

design. Copper plane under the exposed pad isclose as possible to the device with wide andan effective heat sink and is useful for improving

direct PCB traces.

thermal conductivity. As shown in Figure 3, thePower Dissipation and Layout Considerations

amount of copper area to which the PSOP-8 is

Although internal thermal limiting function is

mounted affects thermal performance. When

integrated in GS7103, continuously keeping themounted to the standard PSOP-8 pad (Figurejunction near the thermal shutdown temperature4.a), θJA is 75°C/W. Adding copper area of pad

may

For

under the PSOP-8 Figure 4.b) reduces the θJA tocontinuous operation, it is highly recommended to

54°C/W. Even further, increasing the copper area

Howeverpossibly

affectceramic

devicecapacitors

reliability.

Green Solution Technology Co.,LTD.
Rev.:1.6

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JUN-16

3A Ultra Low Dropout Linear Regulator

GS7103of pad to 70mm2 (Figure 4.c) reduces the θJA to

The maximum power dissipation depends on

49°C/W.

operating ambient temperature or fixed TJ(MAX)andthermalresistance

JA.

For

GS7103

packages, the Figure 5 of derating curves allows
the designer to see the effect of rising ambient
temperature on the maximum power allowed.
3500

Figure 4 (b) Copper Area = 30mm2, JA = 54C/W

Power Dissipation (mW)

Figure 4 (a) Minimum Footprint, JA = 75C/W

3000
2500
2000

TDFN10-3x3

1500

PSOP-8

1000
500

0

25

50

75

100

125

150

Ambient Temperature (°C)

Figure 6 Derating Curve for Packages
Figure 4 (c) Copper Area = 70mm2, JA = 49C/W
Figure 4 JA vs. Different Cooper Area Layout Design

And Figure 4 shows a curve for the θJA of the
PSOP-8 package for different copper area sizes

T thermal Resistance  JA ( C/W)

using a typical PCB with 2oz copper in still air.
90
80
70
60
50
40
0

10

20

30

40

50

60

70

Copper Area (mm2)Figure 5 JA vs. Copper Area

Green Solution Technology Co.,LTD.
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3A Ultra Low Dropout Linear Regulator

GS7103

Package Dimensions, PSOP-8(B)

c
5

8

D1
E1

E H

4

1

DETAIL A
e

b

D
A3

A
L

A1

DETAIL A

Symbol
A
A1
A3
b
c
e
D
E
D1
E1
H
L
θ

Dimensions in
Millimeters
Min.
Max.
1.30
1.80
0.15
1.25
0.31
0.51
0.17
0.25
1.27 REF.
4.70
5.10
3.80
4.00
3.1 REF.
2.3 REF.
5.80
6.20
0.40
1.27
o
o
8
0

Note:
1. Min.: Minimum dimension specified.
2. Max.: Maximum dimension specified.
3. REF.: Reference. Normal/Regular dimension specified for reference.

Green Solution Technology Co.,LTD.
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3A Ultra Low Dropout Linear Regulator

GS7103

Package Dimensions, TDFN10-3x3

e

D
L

6

e

b
7

8

9

10

L

6

7

5

8

9

10

L

3

7

2

5

1

8

9

10

2

1

A

D1

E1

4

6

b

D1

D1
E1

E

e

b

E1

4

Top view

3

2

1

5

4

3

Bottom viewA3

Pin #1 ID Options
Note:The configuration of the Pin#1 identifier is
optional,but must be located within the zone indicated.

A1
Side view

Symbol
A
A1
A3
b
e
D
E
D1
E1
L

Dimensions in
Millimeters
Min.
Max.
0.70
0.80
0.00
0.05
0.203 REF.
0.18
0.30
0.50 REF.
2.90
3.10
2.90
3.10
2.30 REF.
1.65 REF.
0.30
0.50

Note:
1.

Min.: Minimum dimension specified.

2.

Max.: Maximum dimension specified.

3.

REF.: Reference. Normal/Regular dimension specified for reference.

Green Solution Technology Co.,LTD.
Rev.:1.6

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JUN-16

3A Ultra Low Dropout Linear Regulator

GS7103DISCLAIMERS
Please read the notice stated in this preamble carefully before Admission e accessing any contents of the
document attached. Admission of GStek’s statement therein is presumed once the document is released
to the receiver.
Notice:Firstly, GREEN SOLUTION CO., LTD. (GStek) reserves the right to make corrections, modifications, enhancements, improvements, andother changes to its information herein without notice.. And the aforesaid information does not form any part or parts of any quotation orcontract between GStek and the information receiver.
Further, no responsibility is assumed for the usage of the aforesaid information. GStek makes no representation that the interconnectof its circuits as described herein will not infringe on exiting or future patent rights and other intellectual property rights, nor do thedescriptions contained herein express or imply that any licenses under any GStek patent right, copyright, mask work right, or other GStek
intellectual property right relating to any combination, machine, or process in which GStek products or services are used.
Besides, the product in this document is not designed for use in life support appliances, devices, or systems where malfunction of thisproduct can reasonably be expected to result in personal injury. GStek customers’ using or selling this product for use in such applications
shall do so at their own risk and agree to fully indemnify GStek for any damage resulting from such improper use or sale.
At last, the information furnished in this document is the property of GStek and shall be treated as highly confidentiality; any kind of
distribution, disclosure, copying, transformation or use of whole or parts of this document without duly authorization from GStek by priorwritten consent is strictly prohibited. The receiver shall fully compensate GStek without any reservation for any losses thereof due to its
violation of GStek’s confidential request. The receiver is deemed to agree on GStek’s confidential request therein suppose that said receiverreceives this document without making any expressly opposition. In the condition that aforesaid opposition is made, the receiver shallreturn this document to GStek immediately without any delay.

Green Solution Technology Co.,LTD.
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JUN-16