Global Mixed-mode Technology Inc.
300mA High PSRR LDO Regulators
Features
Low, 90µA 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 < 1µA
Low Output Noise at 224µV
Stable with low cost ceramic capacitors
Applications
Notebook Computers
Cellular Phones
PDAs
Digital still Camera and Video Recorders
Hand-Held Devices
Audio Codec
RMS
G923
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
90µA. In the shutdown mode, the maximum supply
current is less than 1µA. 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- temperature protection circuit is built-in in the G923 to
prevent thermal overload. These power saving features make the G923 ideal for use in the battery-powered applications such as notebook computers, 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 voltage is then decided by the resistor ratio. The G923
comes in a space saving SOT-23-5 package.
Pin Configuration
1
1
SHDN
SHDN
2
2
GND
GND
IN
IN
3
3
G963
G963
SOT-23-5
SOT-23-5
G923
G923
OUTPUT
C
C
OUT
OUT
1µF
1µF
OUTPUT
OUTPUT
VOLTAGE
VOLTAGE
C
C
OUT
OUT
1µF
1µF
OUTPUT
VOLTAGE
VOLTAGE
IN OUT
IN OUT
G923
＋
＋
C
C
IN
IN
1µF
1µF
_
＋
＋
－
－
_
BATTERY
BATTERY
C
C
1µF
1µF
IN
IN
Fixed mode
Fixed mode
IN
IN
SHDN
SHDN
BATTERY
BATTERY
5
5
SET
SET
4
4
OUT
OUT
SHDN
SHDN
GND
GND
G923
G923
GND
GND
G923
OUT
OUT
SET
SET
SET
SET
R1
R1
R2
R2
Ver: 1.1
Jan 19, 2006
1
Adjustable mode
Adjustable mode
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Ordering Information
G923
ORDER
NUMBER
G923-330T1U
For other output voltage, please contact us at sales@gmt.com.tw
Note:
T1: SOT-23-5
U: Tape & Reel
ORDER NUMBER
(Pb free)
G923-330T1Uf
MARKING VOLTAGE TEMP. RANGE PACKAGE
92AUx 3.30V -40°C~ +85°C SOT-23-5
Selector Guide
ORDER
NUMBER
G923-150T1U G923-150T1Uf 1.50 92AAx
G923-160T1U G923-160T1Uf 1.60 92ABx
G923-170T1U G923-170T1Uf 1.70 92ACx
G923-180T1U G923-180T1Uf 1.80 92ADx
G923-190T1U G923-190T1Uf 1.90 92AEx
G923-200T1U G923-200T1Uf 2.00 92AFx
G923-210T1U G923-210T1Uf 2.10 92AGx
G923-220T1U G923-220T1Uf 2.20 92AHx
G923-230T1U G923-230T1Uf 2.30 92AIx
G923-240T1U G923-240T1Uf 2.40 92AJx
G923-250T1U G923-250T1Uf 2.50 92AKx
G923-260T1U G923-260T1Uf 2.60 92ALx
G923-270T1U G923-270T1Uf 2.70 92AMx
G923-280T1U G923-280T1Uf 2.80 92ANx
G923-285T1U G923-285T1Uf 2.85 92AOx
G923-290T1U G923-290T1Uf 2.90 92APx
G923-300T1U G923-300T1Uf 3.00 92AQx
G923-310T1U G923-310T1Uf 3.10 92ARx
G923-315T1U G923-315T1Uf 3.15 92ASx
G923-320T1U G923-320T1Uf 3.20 92ATx
G923-330T1U G923-330T1Uf 3.30 92AUx
G923-340T1U G923-340T1Uf 3.40 92AVx
G923-350T1U G923-350T1Uf 3.50 92AWx
G923-360T1U G923-360T1Uf 3.60 92AXx
G923-370T1U G923-370T1Uf 3.70 92AYx
G923-380T1U G923-380T1Uf 3.80 92AZx
G923-390T1U G923-390T1Uf 3.90 92BAx
G923-400T1U G923-400T1Uf 4.00 92BBx
G923-410T1U G923-410T1Uf 4.10 92BCx
G923-420T1U G923-420T1Uf 4.20 92BDx
G923-430T1U G923-430T1Uf 4.30 92BEx
G923-440T1U G923-440T1Uf 4.40 92BFx
G923-450T1U G923-450T1Uf 4.50 92BGx
G923-460T1U G923-460T1Uf 4.60 92BHx
G923-470T1U G923-470T1Uf 4.70 92BIx
G923-475T1U G923-475T1Uf 4.75 92BJx
G923-480T1U G923-480T1Uf 4.80 92BKx
G923-490T1U G923-490T1Uf 4.90 92BLx
G923-500T1U G923-500T1Uf 5.00 92BMx
ORDER NUMBER
(Pb free)
OUTPUT
VOLTAGE (V)
MARKING
Ver: 1.1
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2
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Absolute Maximum Ratings
VIN to GND. . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V
Output Short-Circuit Duration . . . . . . . . . . . . . .Infinite
SET to GND . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
SHDNto GND. . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V
SHDNto IN. . . . . . . . . . . . . . . . . . . . . . . .-7V to 0.3V
OUT to GND. . . . . . . . . . . . . . . . -0.3V to (V
(1)
Note
: 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.
Global Mixed-mode Technology Inc.
Continuous Power Dissipation (T
SOT-23-5. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 520mW
Operating Temperature Range . . . . . . . -40
Junction Temperature. . . . . . . . . . . . . . . . . . . . .150
Thermal Resistance Junction to Ambient, (
SOT-23-5. . . . . . . . . . . . . . . . . . . . . . . . 240
+ 0.3V)
IN
Storage Temperature Range. . . . . . . .-65
Reflow Temperature (soldering, 10sec) . . . . . . 260
G923
= 25°C)
A
°C to 85°C
°C
θ
)
JA
°C/Watt
(1)
°C to 160°C
°C
Electrical Characteristics
(V
=+3.6V, V SHDN =VIN, TA =TJ =+25°C, unless otherwise noted.) (Note 1)
IN
PARAMETER SYMBOL CONDITION MIN TYP MAX UNIT
Input Voltage (Note 2) VIN 2.5 --- 5.5 V
Output Voltage Accuracy V
Adjustable Output Voltage Range (Note 3) V
Maximum Output Current 300 --- --- mA
Current Limit (Note 4) I
Short Circuit Current Isc --- 280 --- mA
Ground Pin Current IQ
Dropout Voltage (Note 5) V
Line Regulation
Load Regulation
Ripple Rejection PSRR F=100Hz, 0.45V
SHUTDOWN
SHDN Input Threshold
SHDN
Input Bias Current
Shutdown Supply Current I
SET INPUT
SET Reference Voltage (Note 3) V
SET Input Leakage Current (Note 3) I
THERMAL PROTECTION
Thermal Shutdown Temperature T
Thermal Shutdown Hysteresis
Note 1: Limits is 100% production tested at TA= +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
every G923 part, see “Typical Performance Characteristics”.
Variation from specified V
OUT
V
OUT
400 550 --- mA
LIM
I
=150mA --- 200 ---
OUT
ΔV
ΔV
DROP
LNR
LDR
=300mA --- 400 ---
I
OUT
SET=GND, V
=10mA
I
OUT
I
= 10mA to 300mA --- 0.02 --- %/mA
OUT
IN=V(STD)
P-P
+0.1V,to 5.5V
, I
OUT
, I
OUT
=1mA -2 --- 2 %
OUT
--- 5.5 V
SET
--- 90 --- µA
--- 0.06 --- %/V
=10mA --- 65 --- dB
VIH Regulator enabled 1.5 --- --V
Regulator shutdown --- --- 0.4
IL
SHDN VSHDN = V
I
V
QSHDN
SET
SET
SHDN
ΔT
SHDN
IN-VOUT
OUT
= 2.5V to 5.5V,
V
IN
I
= 1mA
OUT
V
= 1.3V TA = +25°C --- 5 30 nA
SET
--- 145 --- °C
--- 25 --- °C
) when V
= 0V
IN
T
= +25°C
A
T
= +25°C
A
TA = +25°C
T
= T
to T
A
MIN
is 100mV below the target value of V
OUT
MAX
--- 0.003 0.1 µA
--- 0.2 1 µA
1.225 1.25 1.275
--- 1.25 ---
OUT
. The performance of
mV
V
V
Ver: 1.1
Jan 19, 2006
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN= 5V, V
= 3.3V, CIN = 1µF, C
OUT
= 1µF, TA=25°C, unless otherwise noted.)
OUT
G923
Line Transient Load Transient
Short Circuit Current Start-Up
Overcurrent Protection Characteristics Ripple Rejection
80
IL=100mA
=1µF
OUT
=448mV
Frequency (Hz)
Ver: 1.1
70
60
IL=10mA
50
40
30
Ripple Rejection (dB)
20
10
VIN=5V ; C
V
ripple(pk-pk)
0
10 100 1000 10000 100000
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Shuntdown Pin Del a y Shuntdown Pin Del a y
G923
500
Dropout vs I
O
400
300
200
Drop out (mV)
100
0
0 50 100 150 200 250 300
Io (mA)
Recommended Minimum Footprint
SOT-23-5
Ver: 1.1
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Global Mixed-mode Technology Inc.
Pin Description
NAME
PIN
SHDN
1
2 GND
3 IN Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1µF to GND
4 OUT
5 SET
Active-Low Shutdown Input. A logic low reduces the supply current to less than 1µA. Connect to IN for normal opera-
tion.
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation.
Regulator Output. Fixed or adjustable from 1.25V to +5.5V. Sources up to 300mA. Bypass with a 1µF, ＜0.2Ω
typical ESR capacitor to GND.
Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to the preset output
voltage. Connect to an external resistor divider for adjustable-output operation.
Detailed Description
The block diagram of the G923 is shown in Figure 1. It
consists of an error amplifier, 1.25V bandgap reference,
PMOS output transistor, internal feedback voltage divider,
mode comparator, shutdown logic, over current protection circuit, and over temperature protection circuit.
The mode comparator compares the SET pin voltage
with an internal 350mV reference. If the SET pin voltage is less than 350mV, the internal feedback voltage
divider’s central tap is connected to the non-inverting
input of the error amplifier. The error amplifier compares non-inverting input with the 1.25V bandgap reference. If the feedback voltage is higher than 1.25V,
the error amplifier
PMOS output transistor has a smaller gate-to-source
voltage (V
GS
bility of the PMOS output transistor, as a result the
output voltage decreases until the feedback voltage is
equal to 1.25V. Similarly, when the feedback voltage is
less than 1.25V, the error amplifier causes the output
PMOS to source more current to pull the feedback
’s output becomes higher so that the
). This reduces the current carrying capa-
FUNCTION
voltage up to 1.25V. Thus, through this feedback action, the error amplifier, output PMOS, and the voltage
dividers effectively form a unity-gain amplifier with the
feedback voltage force to be the same as the 1.25V
bandgap reference. The output voltage, V
given by the following equation:
V
= 1.25 (1 + R1/R2). (1)
OUT
Alternatively, the relationship between R1 and R2 is
given by:
R1 = R2 (V
/1.25 - 1). (2)
OUT
For the reasons of reducing power dissipation and
loop stability, R2 is chosen to be 100K
330, R1 is 164K, and the pre-set VOUT is 3.30V.
When external voltage divider is used, as shown in
Figure 2, the SET pin voltage will be larger than
350mV. The non-inverting input of the amplifier will be
connected to the external voltage divider. However,
the operation of the feedback loop is the same, so that
the conditions of Equations 1 and 2 are still true. The
output voltage is still given by Equation 1.
G923
, is then
OUT
Ω. For G923-
SHDN
SHDN
GND
GND
Ver: 1.1
Jan 19, 2006
IN
IN
－
SHUTDOWN
SHUTDOWN
LOGIC
LOGIC
OVER TEMP.
OVER TEMP.
PROTECT
PROTECT
－
ERROR
ERROR
AMP
AMP
＋
＋
1.25V
1.25V
Vref
Vref
MODE COMPARATOR
MODE COMPARATOR
Figure 1. Functional Diagram
6
OVER CURRENT
OVER CURRENT
PROTECT & DYNAMIC
PROTECT & DYNAMIC
FEEDBACK
FEEDBACK
－
－
＋
＋
＋
＋
－
－
350mV
350mV
P
P
OUT
OUT
SET
SET
R1
R1
R2
R2
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Global Mixed-mode Technology Inc.
OUTPUT
OUTPUT
VOLTAGE
VOLTAGE
OUT
IN
IN
OUT
R1
＋
＋
－
－
BATTERY
BATTERY
C
C
IN
IN
1µF
1µF
G923
G923
SHDN
SHDN
GND
GND
SET
SET
Figure 2. Adjustable Output Using External
Feedback Resistors
Over Current Protection
The G923 uses a current sense-resistor to monitor the
output current. A portion of the PMOS output transistor’s current is mirrored to a resistor such that the
voltage across this resistor is proportional to the output
current. Once the output current exceeds limit threshold, G923 would be protected with a limited output
current. Further more, when the output is short to
ground, the output current would be folded-back to a
less limit.
Over Temperature Protection
To prevent abnormal temperature from occurring, the
G923 has a built-in temperature monitoring circuit.
When it detects the temperature is above 145
output transistor is turned off. When the IC is cooled
down to below 120
°C, the output is turned on again. In
this way, the G923 will be protected against abnormal
junction temperature during operation.
Shutdown Mode
When the SHDN pin is connected a logic low voltage,
the G923 enters shutdown mode. All the analog circuits are turned off completely, which reduces the
current consumption to only the leakage current. The
G923 output pass transistor would get into high impedance level. There is an internal discharge path to
help to shorten discharge delay time.
Operating Region and Power Dissipation
Since the G923 is a linear regulator, its power dissipation is always given by P = I
OUT
mum power dissipation is given by:
= (TJ - TA) /θJA,=(150°C-25°C)/240°C/W = 520mW
P
D(MAX)
Where (T
die and the ambient air,
-TA) is the temperature difference the G923
J
θ
, is the thermal resistance
JA
of the chosen package to the ambient air. For surface
R1
R2
R2
(VIN - V
C
C
1µF
1µF
). The maxi-
OUT
OUT
OUT
°C, the
G923
mount device, heat sinking is accomplished by using
the heat spreading capabilities of the PC board and its
copper traces. In the case of a SOT-23-5 package, the
thermal resistance is typically 240
ommended Minimum Footprint) [Figure 3] Refer to
Figure 4 is the G923 valid operating region (Safe Operating Area) & refer to Figure 5 is maximum power
R
R
L
L
dissipation of SOT-23-5.
The die attachment area of the G923
connected to pin 2, which is the GND pin. Therefore,
the GND pin of G923 can carry away the heat of the
G923 die very effectively. To improve the maximum
power providing capability, connect the GND pin to
ground using a large ground plane near the GND pin.
Applications Information
Capacitor Selection and Regulator Stability
Normally, use a 1µF capacitor on the input and a 1µF
capacitor on the output of the G923. Larger input capacitor values and lower ESR provide better supply-noise rejection and transient response. A highervalue input capacitor (10
fast transients are anticipated and the device is located several inches from the power source.
Power-Supply Rejection and Operation from
Sources Other than Batteries
The G923 is designed to deliver low dropout voltages
and low quiescent currents in battery powered systems. Power-supply rejection is 65dB at low frequencies. As the frequency increases above 20kHz, the
output capacitor is the major contributor to the rejection of power-supply noise.
When operating from sources other than batteries,
improve supply-noise rejection and transient response
by increasing the values of the input and output capacitors, and using passive filtering techniques.
Load Transient Considerations
The G923 load-transient response graphs show two
components of the output response: a DC shift of the
output voltage due to the different load currents, and
the transient response. Typical overshoot for step
changes in the load current from 10mA to 300mA is
8mV. Increasing the output capacitor's value and decreasing its ESR attenuates transient spikes.
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential
(or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. Because
the G923 use a P-channel MOSFET pass transistor,
their dropout voltage is a function of R
by the load current.
µF) may be necessary if large,
°C/Watt. (See Rec-
’s lead frame is
DS(ON)
multiplied
Ver: 1.1
Jan 19, 2006
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A
Layout Guide
An input capacitance of ≅ 1µF is required between the
G923 input pin and ground (the amount of the capacitance may be increased without limit), This capacitor
must be located a distance of not more than 1cm from
the input and return to a clean analog ground.
Input capacitor can filter out the input voltage spike
caused by the surge current due to the inductive effect
of the package pin and the printed circuit board’s routing wire. Otherwise, the actual voltage at the IN pin
may exceed the absolute maximum rating.
Global Mixed-mode Technology Inc.
G923
The output capacitor also must be located a distance
of not more than 1cm from output to a clean analog
ground. Because it can filter out the output spike
caused by the surge current due to the inductive effect
of the package pin and the printed circuit board
ing wire. Figure 6 is adjustable mode of G923 PCB
layout. Figure 7 is a PCB layout of G923 fixed mode.
’s rout-
Safe Operating Area of G923 [Power Dissipation Limit]
200
Maximum Recommended Output Current
150
100
TA=25 °C,St ill Air
50
1 oz Copper on S O T-2 3-5 P acka ge
Output Current (mA )
Mounted on recommended mimimum footprint (RθJA=240°C/ W)
0
0.0 0.5 1.0 1.5 2.0 2. 5 3. 0 3.5 4. 0 4.5
Input-Output Voltage Differential VIN-V
Note : V
IN(m ax )
<= 5.5V
OUT
(V)
Figure 3. Recomme nded Minimum Footprint
Maximum Power Dissipation of SOT-23-5
0.7
0.6
TA=25
℃
TA=55
℃
TA=85
℃
Figure 4 Safe Operating Area
0.5
0.4
0.3
0.2
Power Dissipation (W)
0.1
0
25 35 45 55 65 75 85 95 105 115 125
Figu re 5 Power Dissipation vs. Tem peratureFigure 4 Safe Operating Area
St ill A ir
Still Air
1oz Copper on SOT-23-5 P ac kage
1oz copper on SOT-23-5 Package
Moun ted on reco m mend m i mimum fo otp ri nt (RθJA=2 4 0°C /W
Mount e d on r ec o m m ended f oor pr int (R
Amibent Temperature TA (°C)
mibent Temperature TA (°C)
?
=240°C/W)
JA
)
Figure 6. Adjustable Mode Figure 7. Fixed Mode
*Distance between pin & capacitor must no more than 1cm *Distance between pin & capacitor must no more than 1cm
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Package Information
A2
A2
e1
e1
G923
C
D
D
H
H
E
E
e
e
A
A
C
L
L
θ1
θ1
A1
b
b
Note:
1. Package body sizes exclude mold flash protrusions or gate burrs
2. Tolerance ±0.1000 mm (4mil) unless otherwise specified
3. Coplanarity: 0.1000mm
A1
4. Dimension L is measured in gage plane
SYMBOL
A 1.00 1.10 1.30 0.039 0.043 0.051
A1 0.00 ----- 0.10 0.000 ----- 0.004
A2 0.70 0.80 0.90 0.028 0.031 0.035
b 0.35 0.40 0.50 0.014 0.016 0.020
C 0.10 0.15 0.25 0.004 0.006 0.010
D 2.70 2.90 3.10 0.106 0.114 0.122
E 1.40 1.60 1.80 0.055 0.063 0.071
e ----- 1.90(TYP) ----- ----- 0.075(TYP) ----e1 ----- 0.95 ----- ----- 0.037 -----
H 2.60 2.80 3.00 0.102 0.110 0.118
L 0.37 ------ ----- 0.015 ----- -----
θ1
MIN. NOM. MAX. MIN. NOM. MAX.
1° 5° 9° 1° 5° 9°
DIMENSION IN MM DIMENSION IN INCH
Taping Specification
PACKAGE Q’TY/REEL
SOT-23-5 3,000 ea
Feed Direction
Feed Direction
SOT-23-5 Package Orientation
SOT-23-5 Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver: 1.1
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