Page 1
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.
0.8A Ultra Low Dropout Linear Regulator GS7168
Features
0.8A Low-Dropout Voltage Regulator
General Description
The GS7168 can deliver up to 0.8A of output
Ultra Low Dropout Voltage
Typically 100mV at 0.8A Output Current
High Output Accuracy over Line, Load and
Temperature
Build-In Soft-Start
Excellent startup under load from 0 to 0.8A
Power-On-Reset Monitoring on Both V
DD
and
VIN Pins
Power-OK Output function
Foldback over Current Protection and
Thermal shutdown
0.1μA (typ) Shutdown Supply Current
Low ESR Output Capacitor(Multi-layer Chip
Capacitors (MLCC)) Applicable
Vout Pull Low Resistance when Disable
TDFN8-2x2
Green Product (RoHS, Lead-Free,
Halogen-Free Compliant)
Applications
Notebook PC Applications
current with a typical dropout voltage of only
100mV using internal n-channel MOSFETs. The
linear regulator uses a separate VDD supply to
power the control circuitry and drive the Internal
n-channel MOSFETs. The output voltage is
adjustable from 0.8V to the voltage that is very
close to VIN.
The GS7168 allows the use of low-ESR ceramic
capacitor as low as 10uF. Moreover the IC
provides good performance on both line transient
response and load transient response.
The GS7168 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.
During start-up, POK remain low until the output
reaches 92% of its rating value.
The GS7168 is available in TDFN8-2X2 package.
Motherboard Applications
Low Voltage Logic Supplies
Microprocessor and Chipset Supplies
Graphic Cards
Cordless phones
Green Solution Technology Co.,LTD.
Rev.:1.32 1 May-15
Page 2
4
3
2
8
1
6
5
7
VDD
VIN
EN
GND
POK
VOUT
FB
VDD
VIN
ON
EN
VOUT
100K
10uF
1uF
10uF
C
(Option)
GS7168
R2
R1
9
GND
NC
10Ω
Delay
OTP
POR
OCP
3
4
2
1
8
7
6
VIN
VDD
EN
VOUT
POK
FB
GND
Error
AMP
Error
Amplifier
Error
AMP
92%*VREF
VREF=0.8V
Soft Start
EN
VDD
Bandgap
400K
0.8A Ultra Low Dropout Linear Regulator GS7168
Typical Application
Figure1 Typical Application of GS7168
Function Block Diagram
Green Solution Technology Co.,LTD.
Rev.:1.32 2 May-15
Figure 2 Function Block Diagram
Page 3
FB
POK
VOUT
EN VIN VDD
9.GND
1
NC
2 3 4
5
GND
678
Pin No.
Name
I/O type
Pin Function
TDFN8-2x2
1
POK
O
Open drain output. Setting high impedance once V
OUT
reaches 92%
of its rating voltage
2
EN
I
Chip Enable (active high). The device will be shutdown if this pin is
pull low.
3
VIN
I
Input Voltage. Large bulk capacitance should be placed closely to
this pin. A 10μF ceramic capacitor is recommended at this pin.
4
VDD
I
Supply voltage for control circuit. VDD is recommend from 3V to 5V
and should be 1.5V higher than the output voltage
5
NC
6
VOUT
O
Output Voltage. The power output of the device.
7
FB
I
Feedback Voltage. This pin is connected to the center tap of an
external resistor divider network to set the output voltage as V
OUT
=
0.8*(R1+R2)/R2.
8、9
GND
I/O
Ground
No
Item
Contents
1
Package
TD: TDFN8-2x2
2
Shipping
R: Tape & Reel
2. Shipping
1. Package
GS7168TD- R
0.8A Ultra Low Dropout Linear Regulator GS7168
Pin Configuration
Figure 3 TDFN8-2x2 package
Pin Descriptions
Ordering Information
Example: GS7168 TDFN8-2x2 Tape & Reel ordering information is “GS7168TD-R”
Green Solution Technology Co.,LTD.
Rev.:1.32 3 May-15
Page 4
Parameter
Symbol
Limits
Units
Supply Voltage
VIN
-0.3 < VIN< 6.5
V
Control Voltage
VDD
-0.3 < VDD< 6.5
V
Output Voltage
V
OUT
-0.3 < V
OUT
< 5
V
EN, FB, POK
-0.3 < (V
EN, VFB, VPOK
) < 6.5
V
Package Power Dissipation at TA≦25°C
P
D_TDFN8-2x2
822
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_TDFN8-2x2
121.6
°C/W
Thermal Resistance Junction to Case
θ
JC_TDFN8-2x2
53
°C/W
Parameter
Symbol
Limits
Units
Supply Voltage
VIN
1.0 < VIN< Min{5.2V,VDD}
V
Control Voltage (Note 5)
VDD
3.0 < VDD< 5.5
V
Junction Temperature
TJ
- 40 ~ 125
°C
Ambient Temperature
TA
-40 ~ 85
°C
0.8A Ultra Low Dropout Linear Regulator GS7168
Absolute Maximum Rating (Note 1)
Thermal Information (Note 3)
Recommend Operating Condition (Note 4)
Green Solution Technology Co.,LTD.
Rev.:1.32 4 May-15
Page 5
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Supply Voltage Section
VDD Operation Voltage
Range
VDD
V
DD
Input Range, V
OUT=VREF
3.0 5.5
V
VIN Operation Voltage
Range
VIN
V
IN
Input Range, V
OUT=VREF
1.0
Min{5.2
V,VDD}
V
SQuiescent current
IQ
VDD=VIN=VEN=5V,I
OUT
=0A,
V
OUT=VREF
1.0 mA
VDD Input current
I
VDD
VDD=VIN=VEN=5V, I
OUT
=0A,
V
OUT=VREF
1.0 mA
Control Input Current in
Shutdown
I
VDD_SD
VDD=VIN=5.0V, I
OUT
=0A,
VEN=0V
1.0 uA
VDD POR Threshold
V
DDRTH
2.7 V
VDD POR Hysteresis
0.2 V
VIN POR Threshold
V
INRTH
0.75 V
VIN POR Hysteresis
0.20 V
Output Voltage
Reference Voltage
V
REF
I
OUT
=1mA, V
OUT=VREF
0.784
0.8
0.816
V
Output Voltage Accuracy
-2.0
+2.0
%
Line Regulation (VDD)
△ V
LINE_VDD
VDD=4V to 5V, I
OUT
=1mA,
V
OUT=VREF
, VIN=2V
0.03 %
Line Regulation (VIN)
△ V
LINE_IN
VIN=1.2V to 5V, I
OUT
=1mA,
V
OUT=VREF
0.01 %
Load Regulation
△ V
LOAD
(Note 6)
I
OUT
=1mA to 0.8 A, V
OUT=VREF
0.1 %
V
OUT
Pull Low
Resistance
VDD=VIN=5.0V, VEN=0V
130 Ω
Dropout Voltage
Dropout Voltage
(Note 7)
V
DROP
V
OUT=VREF
, I
OUT
=0.8A
100 mV
Protection
Current Limit
ILIM
VDD=VIN=VEN=5V, V
OUT
= V
REF
1.6 A
Short Circuit Current
I
FOLDBACK
V
OUT
<0.2V
100 mA
Thermal Shutdown
Temperature
TSD
TJ Rising
170 °C
Thermal Shutdown
Returned Temperature
120 °C
0.8A Ultra Low Dropout Linear Regulator GS7168
Electrical Characteristics
(VIN= V
+0.5V, VEN=VDD=5V, CIN=C
OUT
=10uF, TA=TJ=25°C)
OUT
Green Solution Technology Co.,LTD.
Rev.:1.32 5 May-15
Page 6
Enable
EN
Threshold
Logic-Low
Voltage
VDD=5V
0.4
V
Logic-High
Voltage
VDD=5V
1.2
V
EN Input Bias Current
IEN
VEN=5V
12 uA
Power Good
PGOOD Rising Threshold
V
REF
Rising
92 %
PGOOD Hysteresis
V
REF
falling
8
%
PGOOD Sink Capability
I
PGOOD
=5mA
0.2 V
PGOOD Delay
-40°C ~125°C
1.7 mS
0.8A Ultra Low Dropout Linear Regulator GS7168
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
JA
board (4 Layers, 2S2P) of JEDEC 51-7 thermal measurement standard. The case point of θJC is
on the expose pad for TDFN8-2x2 package.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. VDD should be 1.5V higher than the output voltage, VDD> 1.5V+Vout
Note 6.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 0.8A.
Note 7. The Dropout voltage is defined as VIN-V
, which is measured when V
OUT
is 0.98*V
OUT
OUT(NORMAL)
.
The dropout voltage is measured at constant junction temperature by using a 2ms current pulse.
Green Solution Technology Co.,LTD.
Rev.:1.32 6 May-15
Page 7
VIN Line Transient Response
V
OUT
=1.2V, I
OUT
=0A
VIN Line Transient Response
V
OUT
=1.2V,I
OUT
=0.8A
VDD Line Transient Response
V
OUT
=1.2V, I
OUT
=0A
VDD Line Transient Response
V
OUT
=1.2V,I
OUT
=0.8A
Load Transient Response
V
OUT
=1.2V, C
OUT
=10uF
Power On from VIN
VIN=3.3V, V
OUT
=1.2V, C
OUT
=1000uF+10uF, no load
0.8A Ultra Low Dropout Linear Regulator GS7168
Typical Characteristics
Green Solution Technology Co.,LTD.
Rev.:1.32 7 May-15
Page 8
Power On from VDD
VDD=5V, V
OUT
=1.2V, C
OUT
=1000uF+10uF, no load
Turn On from EN
VEN=5V, V
OUT
=1.2V, C
OUT
=1000uF+10uF, no load
Turn On from EN
VEN=5V, V
OUT
=1.2V, C
OUT
=10uF, I
OUT
=0.8A
Turn On from EN
VEN=5V, V
OUT
=1.2V, C
OUT
=10uF, R
load
=1.5Ω
Dropout Voltage vs. Output Current
Shutdown Current vs. Input Voltage
0
10
20
30
40
50
60
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Dropout Voltage (mV)
Output Current (A)
0.002
0.022
0.042
0.062
0.082
0.102
2.5 3 3.5 4 4.5 5 5.5
Shutdown Current (uA)
Input Voltage (V)
0.8A Ultra Low Dropout Linear Regulator GS7168
Green Solution Technology Co.,LTD.
Rev.:1.32 8 May-15
Page 9
Quiescent Current vs. Input Voltage
Dropout Voltage vs. Temperature
Quiescent Current vs. Temperature
Output Voltage vs. Temperature
630
650
670
690
710
730
750
770
790
810
2.5 3 3.5 4 4.5 5 5.5
Quiescent Current (uA)
Input Voltage (V)
30.00
35.00
40.00
45.00
50.00
55.00
60.00
65.00
70.00
-40 -20 0 20 40 60 80 100 120
Drop Voltage (V)
Temperature(℃)
0.68
0.7
0.72
0.74
0.76
0.78
0.8
0.82
0.84
0.86
-40 -20 0 20 40 60 80 100 120
Quiescent Current (mA)
Temperature(℃)
0.791
0.792
0.793
0.794
0.795
0.796
0.797
0.798
-40 -20 0 20 40 60 80 100 120
Output Voltage (V)
Temperature(℃)
0.8A Ultra Low Dropout Linear Regulator GS7168
Green Solution Technology Co.,LTD.
Rev.:1.32 9 May-15
Page 10
V
OUT
R1(R2=100KΩ)
C
OPTION
0.8V ~ 3.6V
0 ~ 300 KΩ
NC
0.8A Ultra Low Dropout Linear Regulator GS7168
Application Information
Enable
reach the maximum value of 1.6A. Then further
The GS7168 has a dedicated enable pin(EN).
When the EN pin is in the logic low (VEN<0.4V),
the regulator will be turned off, reducing the
supply current to less than 1uA.
When the EN pin is in the logic high (VEN>1.2V),
the regulator will be turned on and undergoes a
new soft-start cycle. Left open, the EN pin is
pulled down by a internal resistor to shut down
the regulator.
Power-on-Reset
The GS7168 features a power-on-reset control
through monitor both input voltages to prevent
wrong operations. Only after the two supply
voltages exceed their rising POR threshold
voltages, the regulator is to be initiated and starts
up.
POK
decreases in the load resistance reduce both the
load current and the load voltage. The main
advantage of foldback limiting is less power
dissipation in the pass transistor under shorted-
load conditions. During startup, the current limit
value is set to a high value, thus GS7168 can
operate in full load condition. After startup, the
current limit value is set to a normal value, so the
pass transistor can be protected well.
Thermal-Shutdown Protection
Thermal Shutdown protects GS7168 from
excessive power dissipation. If the die
temperature exceeds 170°C, the pass transistor
is shut off. 50°C of hysteresis prevents the
regulator from turning on until the die temperature
drops to 120°C.
Output Capacitor selection
The POK pin is an open-drain output, and can be
connects to V
or other rail through an external
OUT
pull-up resistor. As the output voltage arrives 92%
of normal output voltage, an internal delay
function starts to perform a delay time and then
output the POK pin high to indicate the output is
OK. As the output voltage falls below the falling
Power-OK threshold or one of the two supply
voltages falls below it’s falling POR threshold, the
POK pin will output low immediately without a
delay time.
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
1.5mS.
Current Limit
The GS7168 contains a foldback over current
protection function. It allows the output current to
The GS7168 is specifically designed to employ
ceramic output capacitors as low as 10uF. Place
the capacitors physically as close as possible to
the device with wide and direct PCB traces.
Capacitor ESR should be less than 50mohm.
Feedback Network
Figure 4 shows the feedback network. For
Coption NC application, The suggested design
procedure is to choose R2=100KΩ.
Table 1. R2=100KΩ
For R2>10KΩ application, The suggested design
procedure is to choose table2.
Green Solution Technology Co.,LTD.
Rev.:1.32 10 May-15
Page 11
V
OUT
R1(R2=10KΩ)
C
OPTION
0.8V ~ 1.6V
0 ~ 10 KΩ
470pF~1nF
1.6V ~ 2.4V
10 KΩ ~ 20 KΩ
100pF~500pF
2.4V ~ 3.6V
20 KΩ ~ 30 KΩ
20pF~300pF
Vout
FB
R2
R1
Coption
Cout
Vout
0.8A Ultra Low Dropout Linear Regulator GS7168
P
D(MAX)
= ( T
Where T
− TA ) / θJA
J(MAX)
is the maximum operation junction
J(MAX)
temperature 125°C, TA is the ambient
temperature and the θ
Table 2. R1=10KΩ
thermal resistance.
is the junction to ambient
JA
Figure 4 Feedback Network
Input Capacitor selection
Bypass VIN to ground with a 10uF or greater
capacitor. Bypass VDD to ground with a 1uF
capacitor for normal operation in most applications. 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 GS7168, 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
for maximum reliability.
The power dissipation definition in device is:
PD = (VIN − V
The maximum power dissipation can be
calculated as:
Green Solution Technology Co.,LTD.
Rev.:1.32 11 May-15
) x I
OUT
OUT
+ VDD x IQ
Page 12
D
E
L
k
D1
E1
2
1
3
4
5
6
7
8
b
e
Bottom view
Top view
See Detail A
A
A1
A3
2
1
2
1
Detail A
Pin #1 ID Options
Note:The configuration of the Pin#1 identifier
is optional,but must be located within the
zone indicated.
Side view
pin 1 dot
Symbol
Dimensions in
Millimeters
Min.
Max.
A
0.50
0.80
A1
0.00
0.05
A3
0.20 REF.
b
0.20
0.30
e
0.50 REF.
D
1.90
2.10
E
1.90
2.10
D1
1.60 REF.
E1
0.90 REF.
L
0.20
0.40
0.8A Ultra Low Dropout Linear Regulator GS7168
Package Dimensions, TDFN8-2x2
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.:1.32 12 May-15
Page 13
0.8A Ultra Low Dropout Linear Regulator GS7168
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.:1.32 13 May-15
Loading...