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Global Mixed-mode Technology Inc.
G923
300mA High PSRR LDO Regulators
Features
Low, 90A 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 < 1A Low Output Noise at 224VRMS Stable with low cost ceramic capacitors
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 1A. 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.
Applications
Notebook Computers Cellular Phones PDAs Digital still Camera and Video Recorders Hand-Held Devices Audio Codec
Pin Configuration
IN
OUT
OUTPUT VOLTAGE COUT
C
BATTERY SHDN 1 5 SET
G923
IN
_ 1F
SHDN GND SET
1F
Fixed mode
GND 2
G923 G963
IN
3
4
OUT
IN
OUT R1
OUTPUT VOLTAGE
SOT-23-5 BATTERY CIN 1F
G923
SHDN GND
SET R2 COUT 1F
Adjustable mode
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Global Mixed-mode Technology Inc.
Ordering Information
ORDER NUMBER
G923-330T1U
G923
TEMP. RANGE
-40C~ +85C
ORDER NUMBER (Pb free)
G923-330T1Uf
MARKING
92AUx
VOLTAGE
3.30V
PACKAGE
SOT-23-5
For other output voltage, please contact us at sales@gmt.com.tw Note: T1: SOT-23-5
U: Tape & Reel
Selector Guide
ORDER NUMBER
G923-150T1U G923-160T1U G923-170T1U G923-180T1U G923-190T1U G923-200T1U G923-210T1U G923-220T1U G923-230T1U G923-240T1U G923-250T1U G923-260T1U G923-270T1U G923-280T1U G923-285T1U G923-290T1U G923-300T1U G923-310T1U G923-315T1U G923-320T1U G923-330T1U G923-340T1U G923-350T1U G923-360T1U G923-370T1U G923-380T1U G923-390T1U G923-400T1U G923-410T1U G923-420T1U G923-430T1U G923-440T1U G923-450T1U G923-460T1U G923-470T1U G923-475T1U G923-480T1U G923-490T1U G923-500T1U
ORDER NUMBER (Pb free)
G923-150T1Uf G923-160T1Uf G923-170T1Uf G923-180T1Uf G923-190T1Uf G923-200T1Uf G923-210T1Uf G923-220T1Uf G923-230T1Uf G923-240T1Uf G923-250T1Uf G923-260T1Uf G923-270T1Uf G923-280T1Uf G923-285T1Uf G923-290T1Uf G923-300T1Uf G923-310T1Uf G923-315T1Uf G923-320T1Uf G923-330T1Uf G923-340T1Uf G923-350T1Uf G923-360T1Uf G923-370T1Uf G923-380T1Uf G923-390T1Uf G923-400T1Uf G923-410T1Uf G923-420T1Uf G923-430T1Uf G923-440T1Uf G923-450T1Uf G923-460T1Uf G923-470T1Uf G923-475T1Uf G923-480T1Uf G923-490T1Uf G923-500T1Uf
OUTPUT VOLTAGE (V)
1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.30 2.40 2.50 2.60 2.70 2.80 2.85 2.90 3.00 3.10 3.15 3.20 3.30 3.40 3.50 3.60 3.70 3.80 3.90 4.00 4.10 4.20 4.30 4.40 4.50 4.60 4.70 4.75 4.80 4.90 5.00
MARKING
92AAx 92ABx 92ACx 92ADx 92AEx 92AFx 92AGx 92AHx 92AIx 92AJx 92AKx 92ALx 92AMx 92ANx 92AOx 92APx 92AQx 92ARx 92ASx 92ATx 92AUx 92AVx 92AWx 92AXx 92AYx 92AZx 92BAx 92BBx 92BCx 92BDx 92BEx 92BFx 92BGx 92BHx 92BIx 92BJx 92BKx 92BLx 92BMx
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
VIN 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
G923
SHDN to IN. . . . . . . . . . . . . . . . . . . . . . . .-7V to 0.3V OUT to GND. . . . . . . . . . . . . . . . -0.3V to (VIN + 0.3V)
Note (1): See Recommended Minimum Footprint (Figure 3)
Continuous Power Dissipation (TA = 25C) SOT-23-5. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 520mW Operating Temperature Range . . . . . . . -40C to 85C Junction Temperature. . . . . . . . . . . . . . . . . . . . .150C Thermal Resistance Junction to Ambient, (JA) SOT-23-5. . . . . . . . . . . . . . . . . . . . . . . . 240C/Watt(1) Storage Temperature Range. . . . . . . .-65C to 160C Reflow Temperature (soldering, 10sec) . . . . . . 260C
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
(VIN =+3.6V, V SHDN =VIN, TA =TJ =+25C, unless otherwise noted.) (Note 1) PARAMETER
Input Voltage (Note 2) Output Voltage Accuracy Adjustable Output Voltage Range (Note 3) Maximum Output Current Current Limit (Note 4) Short Circuit Current Ground Pin Current Dropout Voltage (Note 5) Line Regulation Load Regulation Ripple Rejection SHUTDOWN
SHDN Input Threshold SHDN Input Bias Current
SYMBOL
VIN VOUT VOUT ILIM Isc IQ VDROP VLNR VLDR PSRR IOUT =150mA IOUT =300mA
CONDITION
Variation from specified VOUT, IOUT=1mA
MIN TYP MAX UNIT
2.5 -2 VSET 300 400 ----------------------550 280 90 200 400 0.06 0.02 65 5.5 2 5.5 ------------------V % V mA mA mA A mV %/V %/mA dB
SET=GND, VIN=V(STD)+0.1V,to 5.5V IOUT=10mA IOUT = 10mA to 300mA F=100Hz, 0.45VP-P, IOUT=10mA
VIH VIL I SHDN IQSHDN
Regulator enabled Regulator shutdown V SHDN = VIN VOUT = 0V VIN = 2.5V to 5.5V, IOUT = 1mA VSET = 1.3V TA = +25C TA = +25C TA = +25C TA = TMIN to TMAX TA = +25C
1.5 -------
----0.003 0.2
--0.4 0.1 1
V A A
Shutdown Supply Current SET INPUT SET Reference Voltage (Note 3) SET Input Leakage Current (Note 3) THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis
VSET ISET TSHDN TSHDN
1.225 1.25 1.275 ----1.25 5 --30
V nA C C
-----
145 25
-----
Note 1: Limits is 100% production tested at TA= +25C. Low duty pulse techniques are used during test to maintain junction 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 (VIN-VOUT) when VOUT is 100mV below the target value of VOUT. The performance of every G923 part, see "Typical Performance Characteristics".
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN= 5V, VOUT = 3.3V, CIN = 1F, COUT = 1F, TA=25C, unless otherwise noted.)
G923
Load Transient
Line Transient
Short Circuit Current
Start-Up
Overcurrent Protection Characteristics
80 70
Ripple Rejection (dB)
Ripple Rejection
IL=100mA
60 50 40 30 20 10 0 10 100 1000 10000 Frequency (Hz) 100000 V IN=5V ; COUT =1F V ripple(pk-pk)=448mV IL=10mA
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Shuntdown Pin Delay
G923
Shuntdown Pin Delay
Dropout vs IO
500
400
Drop out (mV)
300
200
100
0 0 50 100 150 Io (mA) 200 250 300
Recommended Minimum Footprint
SOT-23-5
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Global Mixed-mode Technology Inc.
Pin Description
PIN
1 2 3 4 5
G923
NAME
SHDN
FUNCTION
Active-Low Shutdown Input. A logic low reduces the supply current to less than 1A. Connect to IN for normal operation. Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1F to GND Regulator Output. Fixed or adjustable from 1.25V to +5.5V. Sources up to 300mA. Bypass with a 1F, 0.2 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.
GND IN OUT SET
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's output becomes higher so that the PMOS output transistor has a smaller gate-to-source voltage (VGS). This reduces the current carrying capability 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
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, VOUT, is then given by the following equation: (1) VOUT = 1.25 (1 + R1/R2). Alternatively, the relationship between R1 and R2 is given by: (2) R1 = R2 (VOUT /1.25 - 1). For the reasons of reducing power dissipation and loop stability, R2 is chosen to be 100K. For G923330, 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.
IN SHDN
SHUTDOWN LOGIC ERROR AMP OVER CURRENT PROTECT & DYNAMIC FEEDBACK
P OUT SET
OVER TEMP. PROTECT 1.25V Vref
R1
350mV R2
GND
MODE COMPARATOR
Figure 1. Functional Diagram
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Global Mixed-mode Technology Inc.
OUTPUT VOLTAGE IN BATTERY CIN 1F OUT R1
G923
G923
SHDN GND
SET R2 COUT 1F RL
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 240C/Watt. (See Recommended Minimum Footprint) [Figure 3] Refer to Figure 4 is the G923 valid operating region (Safe Operating Area) & refer to Figure 5 is maximum power dissipation of SOT-23-5. The die attachment area of the G923's lead frame is 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.
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 145C, the output transistor is turned off. When the IC is cooled down to below 120C, 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 = IOUT (VIN - VOUT). The maximum power dissipation is given by:
Applications Information
Capacitor Selection and Regulator Stability Normally, use a 1F capacitor on the input and a 1F 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 (10F) may be necessary if large, 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 RDS(ON) multiplied by the load current.
PD(MAX) = (TJ - TA) /JA,=(150C-25C)/240C/W = 520mW Where (TJ -TA) is the temperature difference the G923 die and the ambient air,JA, is the thermal resistance of the chosen package to the ambient air. For surface
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Layout Guide An input capacitance of 1F 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.
G923
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.
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's routing wire. Figure 6 is adjustable mode of G923 PCB layout. Figure 7 is a PCB layout of G923 fixed mode.
Figure 3. Recomme nded Minimum Footprint Safe Operating Area of G923 [ Power Diss ipation Limit]
200
Maximum Recommended Outp ut Curren t
Maximum Power Dissipation of SOT-23-5
0.7
Still AirAir St ill
0.6 0.5 TA=25 Power Dissipation (W) 0.4 0.3 0.2 0.1 0
1oz Copper on SOT-23-5 Package 1oz copper on SOT-23-5Package Mount ed on rec omm end mim imum f oot print (RJA=240C/W) Mounted on recommended foorprint (R?JA=240C/W)
150 Output C urrent (mA)
100
TA=55 TA=85
50
TA=25C,Still Air 1oz Copper on SOT -23-5 Package Mounted on recommended mimimum footprint (RJA=240C/ W)
Figure 4 Safe Operating Area
0
0.0 0 .5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
25
35
45
55
65
75
85
95
105
115
125
Input-Output Voltage Differential VI N-VOUT (V) Note : VIN(m ax ) <=5.5V
Amibent Temperature TATA (C) Amibent T emperature (C)
Figure 4 Safe O perating Area
Figure 5 Power Dissipation vs. Tem perature
Figure 6. Adjustable Mode
*Distance between pin & capacitor must no more than 1cm
Figure 7. Fixed Mode
*Distance between pin & capacitor must no more than 1cm
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Package Information
D C L
G923
E
H
1 e1 e
A A2 A1
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 4. Dimension L is measured in gage plane
SYMBOL
A A1 A2 b C D E e e1 H L 1
MIN.
1.00 0.00 0.70 0.35 0.10 2.70 1.40 --------2.60 0.37 1
DIMENSION IN MM NOM.
1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.95 2.80 -----5
MAX.
1.30 0.10 0.90 0.50 0.25 3.10 1.80 --------3.00 ----9
MIN.
0.039 0.000 0.028 0.014 0.004 0.106 0.055 --------0.102 0.015 1
DIMENSION IN INCH NOM.
0.043 ----0.031 0.016 0.006 0.114 0.063 0.075(TYP) 0.037 0.110 ----5
MAX.
0.051 0.004 0.035 0.020 0.010 0.122 0.071 --------0.118 ----9
Taping Specification
PACKAGE
SOT-23-5
Q'TY/REEL
3,000 ea
Feed Direction 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.
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TEL: 886-3-5788833 http://www.gmt.com.tw
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