Ver: 1.1
Jan 19, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G923
Global Mixed-mode Technology Inc.
300mA High PSRR LDO Regulators
Features
Low, 90
A No-Load Supply Current
Guaranteed 300mA Output Current
Dropout Voltage is 200mV @ 150mA Load
PSRR=65dB @ 120Hz
Over-Temperature Protection and Short-Circuit
Protection
Two Modes of Operation ----
Fixed Mode: 1.50V~5.00V
Adjustable Mode: from 1.25V to 5.50V
Max. Supply Current in Shutdown Mode < 1
A
Low Output Noise at 224
V
RMS
Stable with low cost ceramic capacitors
Applications
Notebook Computers
Cellular Phones
PDAs
Digital still Camera and Video Recorders
Hand-Held Devices
Audio Codec
General
Description
The G923 is a low supply current, high PSRR, and low
dropout linear regulator that comes in a space saving
SOT-23-5 package. The supply current at no-load is
90A. In the shutdown mode, the maximum supply
current is less than 1
A. Operating voltage range of
the G923 is from 2.50V to 5.50V. The over-current
protection limit is set at 550mA typical. An over- tem-
perature protection circuit is built-in in the G923 to
prevent thermal overload. These power saving fea-
tures make the G923 ideal for use in the bat-
tery-powered applications such as notebook com-
puters, cellular phones, and PDA
'
s.
The G923 has two modes of operation. When the SET
pin is connected to ground, its output is a pre-set value:
1.50V~5.00V. There is no external component needed
to decide the output voltage. When an output other
than the preset value is needed, two external resistors
should be used as a voltage divider. The output volt-
age is then decided by the resistor ratio. The G923
comes in a space saving SOT-23-5 package.
Pin Configuration
G963
SET
OUT
SOT-23-5
G923
5
4
1
SHDN
2
3
GND
IN
IN
OUT
SHDN
SET
GND
G923
BATTERY C
IN
1
F
R1
R2
C
OUT
1
F
OUTPUT
VOLTAGE
Adjustable mode
IN
OUT
GND
SET
SHDN
G923
C
IN
1
F
_
BATTERY
OUTPUT
VOLTAGE
C
OUT
1
F
Fixed mode
G963
SET
OUT
SOT-23-5
G923
5
4
1
SHDN
2
3
GND
IN
IN
OUT
SHDN
SET
GND
G923
BATTERY C
IN
1
F
R1
R2
C
OUT
1
F
OUTPUT
VOLTAGE
Adjustable mode
IN
OUT
GND
SET
SHDN
G923
C
IN
1
F
_
BATTERY
OUTPUT
VOLTAGE
C
OUT
1
F
Fixed mode
Ver: 1.1
Jan 19, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G923
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
V
IN
to GND. . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V
Output Short-Circuit Duration . . . . . . . . . . . . . .Infinite
SET to GND . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
SHDN to GND. . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V
SHDN to IN. . . . . . . . . . . . . . . . . . . . . . . .-7V to 0.3V
OUT to GND. . . . . . . . . . . . . . . . -0.3V to (V
IN
+ 0.3V)
Continuous Power Dissipation (T
A
= 25
C)
SOT-23-5. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 520mW
Operating Temperature Range . . . . . . . -40
C to 85
C
Junction Temperature. . . . . . . . . . . . . . . . . . . . .150
C
Thermal Resistance Junction to Ambient, (
JA
)
SOT-23-5. . . . . . . . . . . . . . . . . . . . . . . . 240
C/Watt
(1)
Storage Temperature Range. . . . . . . .-65
C to 160
C
Reflow Temperature (soldering, 10sec) . . . . . . 260
C
Note
(1)
: See Recommended Minimum Footprint (Figure 3)
Stresses beyond those listed under
"
Absolute Maximum Ratings
"
may cause permanent damage to the device. These are stress ratings
only, and 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 affect device reliability.
Electrical Characteristics
(V
IN
=+3.6V, V
SHDN
=V
IN
, T
A
=T
J
=+25
C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL
CONDITION MIN
TYP
MAX UNIT
Input Voltage (Note 2)
V
IN
2.5
---
5.5
V
Output Voltage Accuracy
V
OUT
Variation from specified V
OUT
, I
OUT
=1mA -2
---
2
%
Adjustable Output Voltage Range (Note 3)
V
OUT
V
SET
--- 5.5
V
Maximum Output Current
300
---
---
mA
Current Limit (Note 4)
I
LIM
400
550
---
mA
Short Circuit Current
Isc
---
280
---
mA
Ground Pin Current
I
Q
--- 90 ---
A
I
OUT
=150mA
---
200
---
Dropout Voltage (Note 5)
V
DROP
I
OUT
=300mA
---
400
---
mV
Line Regulation
V
LNR
SET=GND, V
IN
=V
(STD)
+0.1V,to 5.5V
I
OUT
=10mA
--- 0.06 ---
%/V
Load Regulation
V
LDR
I
OUT
= 10mA to 300mA
---
0.02 ---
%/mA
Ripple Rejection
PSRR F=100Hz, 0.45V
P-P
, I
OUT
=10mA ---
65
---
dB
SHUTDOWN
V
IH
Regulator
enabled
1.5 --- ---
SHDN
Input Threshold
V
IL
Regulator
shutdown
--- --- 0.4
V
SHDN
Input Bias Current
I
SHDN
V
SHDN
= V
IN
T
A
= +25
C
--- 0.003 0.1
A
Shutdown Supply Current
I
QSHDN
V
OUT
= 0V
T
A
= +25
C
--- 0.2 1
A
SET INPUT
T
A
= +25
C
1.225 1.25 1.275
SET Reference Voltage (Note 3)
V
SET
V
IN
= 2.5V to 5.5V,
I
OUT
= 1mA
T
A
= T
MIN
to T
MAX
--- 1.25 ---
V
SET Input Leakage Current (Note 3)
I
SET
V
SET
= 1.3V
T
A
= +25
C ---
5
30
nA
THERMAL PROTECTION
Thermal Shutdown Temperature
T
SHDN
--- 145 ---
C
Thermal Shutdown Hysteresis
T
SHDN
---
25
---
C
Note 1: Limits is 100% production tested at T
A
= +25
C. Low duty pulse techniques are used during test to maintain junc-
tion temperature as close to ambient as possible.
Note 2: Guaranteed by line regulation test.
Note 3: Adjustable mode only.
Note 4: Not tested. For design purposes, the current limit should be considered 400mA minimum to 650mA maximum.
Note 5: The dropout voltage is defined as (V
IN
-V
OUT
) when V
OUT
is 100mV below the target value of V
OUT
. The performance of
every G923 part, see "Typical Performance Characteristics".
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