Page 1
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1.2A Ultra Low Dropout Linear Regulator GS7112
Features
Maximum 1.2A Low-Dropout Voltage
General Description
The GS7112 is a three-terminal regulator which
Regulator
Ultra Low Dropout Voltage
Typically 400mV at 1A Output Current
High Output Accuracy over Line, Load and
Temperature
Build-In Soft-Start
Excellent startup under load from 0 to 1.2A
Power-On-Reset Monitoring on V
Foldback over Current Protection and
DD
Pin
Thermal shutdown
Low ESR Output Capacitor(Multi-layer Chip
Capacitors (MLCC)) Applicable
SOT-223, SOT-89-5,TO-252,TO-263 and
PSOP-8 package
Green Product (RoHS, Lead-Free,
Halogen-Free Compliant)
can deliver up to 1A of continuous output current
with a typical dropout voltage of only 400mV
using internal p-channel MOSFETs.
The GS7112 allows the use of low-ESR ceramic
capacitor as low as 4.7uF. Moreover the IC
provides good performance on both line transient
response and load transient response.
The GS7112 provides foldback over current limit
and thermal shutdown to prevent the linear
regulator from damage. Built-in soft-start
minimizes stress on the input power source by
reducing capacitive inrush current on start-up.
The GS7112 is available in the SOT-223,
SOT-89-5,TO-252,TO-263 and PSOP-8 package.
Applications
Notebook PC Applications
Motherboard Applications
LCD Monitor
Telecom Equipment
Graphic Cards
DVD-video Player
Green Solution Technology Co.,LTD.
Rev.:1.1 1 Sep-15
Page 2
GS7112
4.7uF
4.7uF
VDD VOUT
C1
C2
GS7112
4.7uF
4.7uF
VDD
VOUT
VDD VOUT
EN ADJ
OF
F
ON
GND
C1 C2
R
1
R
2
VOUT=0.8V*(R2/R1+1)
OTP
POR
OCP
VDD
VOUT
GND
Error
AMP
Error
Amplifier
V
REF
=0.8V
Soft Start
Non EN Voltage Version
1.2A Ultra Low Dropout Linear Regulator GS7112
Typical Application
Figure 1a Typical Application of GS7112 (non EN)
Figure 1b Typical Application of GS7112(ADJ)
Function Block Diagram
Green Solution Technology Co.,LTD.
Rev.:1.1 2 Sep-15
Figure 2a Function Block Diagram (non EN)
Page 3
OTP
POR
OCP
VDD
VOUT
GND
Error
AMP
Error
Amplifier
Soft Start
EN
EN
V
REF
=0.8V
Fix Voltage Version
OTP
POR
OCP
VDD
VOUT
GND
Error
AMP
Error
Amplifier
Soft Start
EN
EN
V
REF
=0.8V
ADJ
Adjustable Voltage Version
1.2A Ultra Low Dropout Linear Regulator GS7112
Figure 2b Function Block Diagram (Fix)
Figure 2c Function Block Diagram (ADJ)
Green Solution Technology Co.,LTD.
Rev.:1.1 3 Sep-15
Page 4
1
2 3
4
5
6
7
8
NC
EN
VDD VDD
NC
VOUT
ADJ/
NC
GND
GND
1
2 3
4
5
6
7
8
EN
VDDVDD
NC
VOUT
ADJ
GND
GND
VOUT
1
2
3
VOUT
GND
VDD
VDD
VOUT
GND
1
2
3
1 2 3
5
4
NCGNDEN
VOUTVDD
1 2 3
5
4
ADJGNDVOUT
VDDEN
1 2
3
GND VOUT VDD
1 2
3
GND
VOUTVDD
VDD
VOUT
GND
1
2
3
1.2A Ultra Low Dropout Linear Regulator GS7112
Pin Configuration
PSOP-8(SO) package PSOP-8*(SP) package TO-252(D0) package
TO-252*(T1) package SOT-89-5(F1) package SOT-89-5*(F2) package
SOT-223*(S2) package SOT-223(S3) package TO-263 package
Green Solution Technology Co.,LTD.
Rev.:1.1 4 Sep-15
Page 5
No.
Name
I/O
type
Description
SOT-223*
SOT-223
SOT-89-5
SOT-89-5*
PSOP-8
PSOP-8*
TO-252
TO-252*/
TO-263
1 2 2
2 8 6 1 2
GND
I/O
Ground pin
2 3 5
3
6
3、4
2
3
VOUT
O
Output Voltage
3 1 4
5
3、4
1、2
3 1 VDD
I/O
Supply voltage
3
4 2 8
EN
I
Enable input
(active high)
1
1、5
7
7
NC
Not connected
1 5
ADJ
I
Adjustable input.
Feedback pin
connect to
resistor divider.
1.2A Ultra Low Dropout Linear Regulator GS7112
Pin Descriptions
Green Solution Technology Co.,LTD.
Rev.:1.1 5 Sep-15
Page 6
No
Item
Contents
1
Package
S2: SOT-223*
S3: SOT-223
F1: SOT-89-5
F2: SOT-89-5*
SO:PSOP-8
SP:PSOP-8*
D0:TO-252
T1:TO-252*
TO:TO-263
2
Output Voltage
ADJ: 0.8V to 5.0V
2P5: 2.5V, 2P8: 2.8V, 285: 2.85V, 3P0: 3.0V, 3P3: 3.3V, 5P0: 5.0V
3
Shipping
R: Tape & Reel, T: Tube
3. Shipping
GS7112PP-XXX-R
2. Output Voltage
1. Package
1.2A Ultra Low Dropout Linear Regulator GS7112
Ordering Information
Example: GS7112 PSOP-8 3.3V Tape & Reel ordering information is “GS7112SO-3P3-R”
Green Solution Technology Co.,LTD.
Rev.:1.1 6 Sep-15
Page 7
Parameter
Symbol
Maximum
Units
Control Voltage
VDD
7
V
Package Power Dissipation at TA≦25°C
P
D_SOT-223
741
mW
Package Power Dissipation at TA≦25°C
P
D_SOT-89-5
500
mW
Package Power Dissipation at TA≦25°C
P
D_PSOP-8
1333
mW
Package Power Dissipation at TA≦25°C
P
D_TO-252
1333
mW
Package Power Dissipation at TA≦25°C
P
D_TO-263
1600
mW
Junction Temperature
TJ
- 45 ~ 150
°C
Storage Temperature
T
STG
- 65 ~ 150
°C
Lead Temperature (Soldering) 10S
T
LEAD
260
°C
ESD (Human Body Mode) (Note 2)
V
ESD_HBM
2K
V
ESD (Machine Mode) (Note 2)
V
ESD_MM
200
V
Parameter
Symbol
Limits
Units
Thermal Resistance Junction to Ambient
θ
JA_SOT-223
135
°C/W
Thermal Resistance Junction to Ambient
θ
JA_SOT-89-5
200
°C/W
Thermal Resistance Junction to Ambient
θ
JA_PSOP-8
75
°C/W
Thermal Resistance Junction to Ambient
θ
JA_TO-252
75
°C/W
Thermal Resistance Junction to Ambient
θ
JA_TO-263
62.5
°C/W
Parameter
Symbol
Limits
Units
Control Voltage
VDD
(V
OUT
+ V
DROPOUT)
< VDD< 6.5
V
Junction Temperature
TJ
-40 ~ 125
°C
Ambient Temperature
TA
-40 ~ 85
°C
1.2A Ultra Low Dropout Linear Regulator GS7112
Absolute Maximum Rating (Note 1)
Thermal Information (Note 3)
Recommend Operating Condition (Note 4)
Green Solution Technology Co.,LTD.
Rev.:1.1 7 Sep-15
Page 8
Parameter
Symbol
Test Conditions
Min
Typ.
Max
Units
Input Voltage
VDD
V
OUT+VDROPOUT
（V
DD
must≧2.3V）
6.5
V
Output Voltage accuracy
VO
-2
2 %
Adjustable input
voltage(Note 5, 9)
V
ADJ
I
OUT
=0.1mA
0.784
0.8
0.816
V
Dropout Voltage
(Note 6)
V
DROP
IO=1000mA,VO=3.3V
400
550
mV
IO=1200mA,VO=3.3V
500
650
mV
Current limit
I
LIMIT
1.6 A
Short current limit
(Note 7)
ISC
VO <0.2
100
mA
Quiescent Current
IQ
85
120
uA
Line Regulation
V
R-LINE
IO=1mA, VDD = VO +1V
to 6.5V
-0.2
0.2
%/V
Load Regulation
V
R-LOAD
IO=1mA to 1000mA
60
80
mV
POR threshold
2.1 V
EN
Threshold
(Note 8,9)
Logic-Low
Voltage
V
EN-L
0.4
V
Logic-High
Voltage
V
EN-H
1.4
EN Input Bias
Current (Note 9)
IEN
VEN=5V
0.3 1 uA
Over temperature
shutdown
TSD
160
°C
Return temperature
130
°C
Power supply rejection
PSRR
IO=100mA
f=1kHz
50
dB
f=20KHz
22
1.2A Ultra Low Dropout Linear Regulator GS7112
Electrical Characteristics
VIN=V
OUT
+1V, I
=0.1mA, C
OUT
=4.7µF, C
VDD
=4.7µF, TA =25°C, unless otherwise specified.
OUT
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device.
These are for stress ratings. Functional operation of the device at these or any other conditions 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 to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. θ
is measured in the natural convection at TA=25°C on a high effective thermal conductivity test board
JA
(4 Layers, 2S2P) of JEDEC 51-7 thermal measurement standard.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. SOT-89-5*, PSOP-8 and PSOP-8* Package.
Green Solution Technology Co.,LTD.
Rev.:1.1 8 Sep-15
Page 9
1.2A Ultra Low Dropout Linear Regulator GS7112
Note 6. The Dropout voltage is defined as VIN-V
Note 7. If V
is detected as <0.2V, then Io is restricted to typical 100mA.
OUT
Note 8. SOT-89-5, SOT-89-5*, PSOP-8 and PSOP-8* Package.
Note 9. 5 Pin application.
, which is measured when V
OUT
is 0.98*V
OUT
OUT(NORMAL)
.
Green Solution Technology Co.,LTD.
Rev.:1.1 9 Sep-15
Page 10
Load Regulation
Line Regulation
Output Voltage vs. Temperature
Ground Current vs. Input Voltage
Ground Current vs. Load Current
Ground Current vs. Temperature
Dropout vs. Temperature
Dropout vs. Load Current
1.2A Ultra Low Dropout Linear Regulator GS7112
Typical Characteristics
Green Solution Technology Co.,LTD.
Rev.:1.1 10 Sep-15
Page 11
Circuit Current vs. Input Voltage
PSRR vs. Frequency
Line Transient Response
V
OUT
=3.3V, I
OUT
=0.1mA
Load Transient Response
V
OUT
=3.3V,VDD=4.3V
1.2A Ultra Low Dropout Linear Regulator GS7112
Green Solution Technology Co.,LTD.
Rev.:1.1 11 Sep-15
Page 12
1.2A Ultra Low Dropout Linear Regulator GS7112
Application Information
Power-on-Reset
the device with wide and direct PCB traces.
The GS7112 features a power-on-reset control
through monitor the supply voltage to prevent
wrong operation. Only after the supply voltage
exceed its rising POR threshold voltage, the
regulator is to be initiated and starts up.
Build-In Soft-Start
An internal soft-start function controls rise rate of
the output voltage to limit the current surge at
start-up. The typical soft-start interval is about
0.5mS.
Current Limit
The GS7112 contains a foldback over current
protection function. It allows the output current to
reach the maximum value of 1.6A. Then further
decreases in the load resistance reduce both the
load current and the load voltage. The main
advantage of foldback limiting is less power
Input Capacitor selection
Bypass VDD to ground with a 4.7uF or greater
capacitor. Ceramic, tantalum or aluminum
electrolytic capacitors may be selected for input
capacitor. However ceramic capacitors are
recommended due to their significant cost and
space savings. Place the capacitors physically as
close as possible to the device with wide and
direct PCB traces.
Power Dissipation and Layout Considerations
Although internal thermal limiting function is
integrated in GS7112, continuously keeping the
junction near the thermal shutdown temperature
may possibly affect device reliability. For
continuous operation, it is highly recommended to
keep the junction temperature below the
maximum operation junction temperature 125°C
dissipation in the pass transistor under shorted-
load conditions. During startup, the current limit
value is set to high, thus GS7112 can operate in
full load condition. After startup, the current limit
value is set to normal value, so the pass transistor
is protected well.
Thermal-Shutdown Protection
Thermal Shutdown protects GS7112 from
excessive power dissipation. If the die
temperature exceeds 160°C , the pass transistor
is shut off.30°C of hysteresis prevents the
regulator from turning on until the die temperature
drops to 130°C .
Output Capacitor selection
The GS7112 is specifically designed to employ
ceramic output capacitor as low as 4.7uF. Place
the capacitors physically as close as possible to
for maximum reliability.
The power dissipation definition in device is:
PD = (VIN − V
OUT
) x I
+ VDD x IQ
OUT
The maximum power dissipation can be
calculated as:
P
Where T
D(MAX)
= ( T
J(MAX)
− TA ) / θJA
J(MAX)
is the maximum operation junction
temperature 125°C, TA is the ambient
temperature and the θJA is the junction to ambient
thermal resistance.
The thermal resistance θJA for PSOP-8 package
is 75°C/W on the standard JEDEC 51-7 (4 layers,
2S2P) thermal test board. The copper thickness
is 2oz. The maximum power dissipation at TA =
25°C can be calculated by following formula:
P
= (125°C − 25°C) / (75°C/W) = 1.33W
D(MAX)
(SOP-8 Exposed Pad on the minimum layout)
Green Solution Technology Co.,LTD.
Rev.:1.1 12 Sep-15
Page 13
T thermal Resistance
JA
(C/W)
0 10 20 30 40 50 60 70
Copper Area (mm 2)
90
80
70
60
50
40
0 25 50 75 100 125 150
Ambient Temperature (°C)
Power Dissipation (mW)
3500
3000
2500
2000
1500
1000
500
PSOP-8
1.2A Ultra Low Dropout Linear Regulator GS7112
The thermal resistance θJA of PSOP-8 is
determined by the package design and the PCB
design. Copper plane under the exposed pad is
an effective heat sink and is useful for improving
thermal conductivity. As shown in Figure 3, the
amount of copper area to which the PSOP-8 is
mounted affects thermal performance. When
mounted to the standard PSOP-8 pad (Figure 3a),
θJA is 75°C/W. Adding copper area of pad under
the PSOP-8 Figure 3b) reduces the θJA to 54°C/W.
Even further, increasing the copper area of pad to
70mm2 (Figure 3c) reduces the θJA to 49°C/W.
Figure 3 (a) Minimum Footprint,
Figure 3 (b) Copper Area = 30mm2,
= 75C/W
JA
= 54C/W
JA
Figure 4
The maximum power dissipation depends on
operating ambient temperature or fixed T
and thermal resistance JA. For GS7112
packages, the Figure 5 of derating curves allows
the designer to see the effect of rising ambient
temperature on the maximum power allowed.
vs. Copper Area
JA
J(MAX)
Figure 3 (c) Copper Area = 70mm2,
Figure 3 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
using a typical PCB with 2oz copper in still air.
Green Solution Technology Co.,LTD.
Rev.:1.1 13 Sep-15
= 49C/W
JA
Figure 5 Derating Curve for Packages
Page 14
Symbol
Dimensions in
Millimeters
Min.
Max.
A
1.40
1.60
A1
0.30
0.50
b
0.36
0.48
b1
0.41
0.53
C
0.38
0.43
D
4.40
4.60
E
--
4.25
E1
2.40
2.60
e
1.50 REF.
L
0.80
--
1.2A Ultra Low Dropout Linear Regulator GS7112
Package Dimensions, SOT-89-5
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.:1.1 14 Sep-15
Page 15
Symbol
Dimensions in
Millimeters
Min.
Max. A --
1.80
A1
0.00
0.10
A2
1.50
1.70
b
0.65
0.82
b1
2.90
3.10
D
6.20
6.60
c
0.25
0.35
E
6.80
7.20
E1
3.30
3.70
e
2.30 REF.
e1
4.60 REF.
L
0.80
1.20
θ
0o
10o
1.2A Ultra Low Dropout Linear Regulator GS7112
Package Dimensions, SOT-223
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.:1.1 15 Sep-15
Page 16
Symbol
Dimensions in
Millimeters
Min.
Max.
A
1.30
1.80
A1 - 0.15
A2
1.24
-
B
0.31
0.51
D
4.70
5.10
E
3.80
4.00
D1
2.00
2.30
E1
2.00
2.30 e 1.27 REF.
F
0.17
0.25
H
5.80
6.20
L
0.40
1.27
θ
0o
8o
1.2A Ultra Low Dropout Linear Regulator GS7112
Package Dimensions, PSOP-8(S)
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.:1.1 16 Sep-15
Page 17
Symbol
Dimensions in
Millimeters
Min.
Max.
A
2.20
2.40
A1
0.00
0.15
b
0.50
0.70
b2
5.20
5.50
c
0.43
0.60
c1
0.43
0.58
D
5.40
6.20
E
6.35
6.80
D1
4.57
--
E1
3.80
-- e 2.30 REF.
H
9.40
10.40
L
1.40
1.78
L1
0.35
1.20
L2
0.89
1.65
1.2A Ultra Low Dropout Linear Regulator GS7112
Package Dimensions, TO-252
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.:1.1 17 Sep-15
Page 18
Symbol
Dimensions in Millimeters
Min.
Max. A 4.06
4.82
A1
0.00
0.25 b 0.70
1.00
b2
1.17
1.47 c 0.31
0.53
c2
1.17
1.45 D 8.50
9.25
D1
6.60 REF.
E
9.80
10.40
E1
7.80 REF.
e
2.54 REF.
H
14.6
15.8
L
2.00
2.80
L1
1.27 REF.
L2
1.50 REF.
1.2A Ultra Low Dropout Linear Regulator GS7112
Package Dimensions, TO-263
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.:1.1 18 Sep-15
Page 19
1.2A Ultra Low Dropout Linear Regulator GS7112
DISCLAIMERS
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, and
other changes to its information herein without notice.. And the aforesaid information does not form any part or parts of any quotation or
contract between GStek and the information receiver.
Further, no responsibility is assumed for the usage of the aforesaid information. GStek makes no representation that the interconnect
of its circuits as described herein will not infringe on exiting or future patent rights and other intellectual property rights, nor do the
descriptions 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 this
product 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 prior
written 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 receiver
receives this document without making any expressly opposition. In the condition that aforesaid opposition is made, the receiver shall
return this document to GStek immediately without any delay.
Green Solution Technology Co.,LTD.
Rev.:1.1 19 Sep-15
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