GQ2143 Datasheet PDF - GTM

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GQ2143
GTM

Part Number GQ2143
Description CMOS POSITIVE VOLTAGE REGULATOR
Page 8 Pages


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ISSUED DATE :2005/01/24
REVISED DATE :
GQ2143
CMOS Po siti ve Vol tag e Regu l ato r
Description
The GQ2143 of positive, linear regulators feature low quiescent current (35 A typ.) with low dropout voltage,
making them ideal for battery applications.
This rugged device has both Thermal Shutdown, and Current Fold-back to prevent device failure under the
“Worst” of operating conditions.
The GQ2143 is stable with an output capacitance of 2.2 F or greater.
Features
Very Low Dropout Voltage
Guaranteed 300mA output
Over-Temperature Shutdown
Current Limiting
Short Circuit Current Fold-back
Highly Accurate± 1.5%
Adjustable output voltages
Power-saving Shutdown Mode
Low Temperature coefficient
Applications
Battery Powered Widgets
Instrumentation
Wireless Devices
PC Peripherals
Portable Electronics
Cordless Phones
Electronic Scales
Package Dimensions
Functional Block Diagram
Typical Application Circuit
REF.
A
B
C
D
E
F
Millimeter
Min. Max.
2.70 3.10
2.60 3.00
1.40 1.80
0.30 0.55
0 0.10
0° 10°
REF.
G
H
I
J
K
L
Dimensions
Millimeter
1.90 REF.
1.20 REF.
0.12 REF.
0.37 REF.
0.60 REF.
0.95 REF.
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ISSUED DATE :2005/01/24
REVISED DATE :
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
Input Max Voltage
VIN 8
V
Output Current
IOUT
PD/( VIN- VO)
mA
Input, Output Voltage
GND-0.3 to VIN+0.3
V
Operating Ambient Temperature
Topr -40 ~ +85
Junction Temperature
Tj -40 ~ +125
Maximum Junction Temperature
Thermal Resistance
Tj Max
ja
150
260
/W
Power Dissipation( T=100 )
PD 380 mW
EDS Classification
B
Electrical Characteristics Ta=25 VIN=5V, unless otherwise noted
Parameter
Output Voltage
Output Current
Current Limit
Load Regulation
Dropout Voltage
Ground Pin Current
Line Regulation
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Output Voltage
Temperature Coefficient
Short Circuit Current(Note2)
Symbol
VO
IO
ILIM
REGLOAD
VDROPOUT
IGND
REGLINE
VIN
OTS
OTH
TC
ISC
Condition
VIN=5V, IO=1mA
VIN=5V, VO>1.2
VIN=5V, VO>1.2
VIN=5V, IO=1mA to 300mA
IO=300mA
VO=VO(NOM)-2%
1.5V<VO(NOM) 2.0V
2.0V<VO(NOM) 2.8V
2.8V<VO(NOM)<3.8V
VIN=5V, IO=1mA~300mA
IO=5mA
VIN=VOUT(T)+1 to
VOUT(T)+2
VO V
VO 2.0V
VIN=5V, VOUT<0.8V
Min
-1.5%
300
300
-
-
-
-
-
-
-
Note1
-
-
-
-
TYP
-
-
450
0.2
-
-
-
35
-
0.02
-
150
30
30
150
Max
1.5%
-
-
1
1300
400
300
-
0.15
0.1
7
-
-
-
300
Unit
V
mA
mA
%
mV
A
%
V
ppm/
mA
Power Supply Rejection
PSRR
VIN=5V
Io=100mA
Co=2.2 F
f=100Hz
f=1kHz
f=10kHz
- 60 -
- 50 -
- 20 -
dB
Output Voltage Noise
ADJ Input Bias Current
ADJ Reference Voltage
EN Input Threshold
EN Input Bias Current
Shutdown Supply Current
Shutdown Output Voltage
Output Under Voltage
Output Over Voltage
eN
IADJ
VREF
VEH
VEL
IEH
IEL
ISD
VO,SD
VUV
VOV
f=10Hz~100kHz
Io=10mA
C BYP=0 F
Co=2.2 F
VIN=2.7V to 7V
VIN=2.7V to 7V
VEN=VIN, VIN=2.7V to 7V
VEN= 0V, VIN=2.7V to 7V
VIN=5V, VO=0V, VEN<VEL
Io=35 A, VEN<VEL
- 30 - Vrms
-1-
A
1.2 1.215 1.23
2.0 - VIN
V
0
- 0.4
V
- - 0.1 A
- - 0.5 A
- 0.5 1
A
0
- 0.1
V
- - 85 %Vo(NOM)
115 -
- %Vo(NOM)
Note 1: VIN (MIN) =VOUT+VDROPOUT
2: To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must be applied before
a current source load is applied.
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ISSUED DATE :2005/01/24
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Ordering Information ( contd. )
Part Number
GQ2143-AD
Marking
3DAD2
XXXX
Output Voltage
Adjustable
Part Number
Marking
Output Voltage
Detailed Description
The GQ2143 of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier,
over-current protection, thermal shutdown and Power Good detection circuitry.
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal
protection circuits. During normal operation, the error amplifier compares the output voltage to a precision
reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds
150 , or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 .
The GQ2143 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GQ2143 also incorporates current fold-back to reduce power dissipation when
the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces
the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts.
External Capacitors
The GQ2143 is stable with an output capacitance to ground of 2.2 F or greater. Ceramic capacitors have the
lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the
highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are
comparatively expensive. One option is to parallel a 0.1 F ceramic capacitor with a 10 F Aluminum Electrolytic.
The benefit is low ESR, high capacitance, and low overall cost.
A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should
be at least 0.1 F to have a beneficial effect.
All capacitors should be placed in close proximity to the pins. A “Quiet” ground termination is desirable. This
can be achieved with a “Star” connection.
Enable
The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all
internal circuits are powered down. In this state, the quiescent current is less than 1 A. This pin behaves much
like an electronic switch.
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Characteristics Curve
ISSUED DATE :2005/01/24
REVISED DATE :
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