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Global Mixed-mode Technology Inc.
G924
300mA Low-Noise LDO Regulators
Features
Low, 90A No-Load Supply Current Guaranteed 300mA Output Current Dropout Voltage is 200mV @ 150mA Load PSRR=53dB @ 1kHz Over-Temperature Protection and Short-Circuit Protection Max. Supply Current in Shutdown Mode < 1A Low Output Noise at 28VRMS Stable with low cost ceramic capacitors Output voltage: 1.20V~5.00V
General Description
The G924 is a low supply current, 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 G924 is from 2.5V to 5.5V. The over-current protection limit is set at 550mA typical and 400mA minimum. An over-temperature protection circuit is built-in in the G924 to prevent thermal overload. These power saving features make the G924 ideal for use in the batterypowered applications such as notebook computers, cellular phones, and PDA's.
Applications
Notebook Computers Cellular Phones PDAs Digital still Camera and Video Recorders Hand-Held Devices Audio Codec
Pin Configuration
Typical Application Circuit
SHDN
1
5
VIN
VIN
OUT
OUTPUT VOLTAGE
GND
2
G924
4 SOT-23-5 OUT
C
BATTERY
G924
IN
_ 1F
SHDN BYP GND
COUT 1F CBYP
10nF
BYP
3
Fixed mode
Ver: 0.2 Preliminary Oct 01, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Ordering Information
ORDER NUMBER
G924-330T1U
G924
TEMP. RANGE
-40C~ +85C
ORDER NUMBER (Pb free)
G924-330T1Uf
MARKING
94AXx
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
G924-120T1U G924-130T1U G924-140T1U G924-150T1U G924-160T1U G924-170T1U G924-180T1U G924-190T1U G924-200T1U G924-210T1U G924-220T1U G924-230T1U G924-240T1U G924-250T1U G924-260T1U G924-270T1U G924-280T1U G924-285T1U G924-290T1U G924-300T1U G924-310T1U G924-315T1U G924-320T1U G924-330T1U G924-340T1U G924-350T1U G924-360T1U G924-370T1U G924-380T1U G924-390T1U G924-400T1U G924-410T1U G924-420T1U G924-430T1U G924-440T1U G924-450T1U G924-460T1U G924-470T1U G924-475T1U G924-480T1U G924-490T1U G924-500T1U
ORDER NUMBER (Pb free)
G924-120T1Uf G924-130T1Uf G924-140T1Uf G924-150T1Uf G924-160T1Uf G924-170T1Uf G924-180T1Uf G924-190T1Uf G924-200T1Uf G924-210T1Uf G924-220T1Uf G924-230T1Uf G924-240T1Uf G924-250T1Uf G924-260T1Uf G924-270T1Uf G924-280T1Uf G924-285T1Uf G924-290T1Uf G924-300T1Uf G924-310T1Uf G924-315T1Uf G924-320T1Uf G924-330T1Uf G924-340T1Uf G924-350T1Uf G924-360T1Uf G924-370T1Uf G924-380T1Uf G924-390T1Uf G924-400T1Uf G924-410T1Uf G924-420T1Uf G924-430T1Uf G924-440T1Uf G924-450T1Uf G924-460T1Uf G924-470T1Uf G924-475T1Uf G924-480T1Uf G924-490T1Uf G924-500T1Uf
OUTPUT VOLTAGE (V)
1.20 1.30 1.40 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
94AAx 94ABx 94ACx 94ADx 94AEx 94AFx 94AGx 94AHx 94AIx 94AJx 94AKx 94ALx 94AMx 94ANx 94AOx 94APx 94AQx 94ARx 94ASx 94ATx 94AUx 94AVx 94AWx 94AXx 94AYx 94AZx 94BAx 94BBx 94BCx 94BDx 94BEx 94BFx 94BGx 94BHx 94BIx 94BJx 94BKx 94BLx 94BMx 94BNx 94BOx 94BPx
Ver: 0.2 Preliminary Oct 01, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
VIN to GND.....................................-0.3V to +6.5V Output Short-Circuit Duration........................Infinite SHDN to GND.............................-0.3V to VIN+0.3V OUT to GND...........................-0.3V to (VIN + 0.3V) Continuous Power Dissipation (TA = +25C) SOT-23-5................................................520mW
Note (1): See Recommended Minimum Footprint
G924
Operating Temperature Range...........-40C to +85C Junction Temperature..............................+150C JA (1) .............................................240C/Watt Storage Temperature Range..........-65C to +150C 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 =5V, V SHDN =VIN, TA =TJ =25C, unless otherwise noted.) (Note 1) PARAMETER
Input Voltage (Note 2) Output Voltage Accuracy Maximum Output Current Current Limit (Note 3) Short Circuit Current Ground Pin Current ILIM Isc IQ VOUT=1.50V VOUT=1.80V VOUT=2.50V Dropout Voltage (Note 4) VDROP IOUT =300mA VOUT=3.00V VOUT=3.30V VOUT=4.75V VOUT=5.00V Line Regulation Load Regulation Ripple Rejection Output Voltage Noise (10Hz to 100kHz) SHUTDOWN
SHDN Input Threshold
SYMBOL
VIN
CONDITION
VOUT2.50V, IOUT=1mA
MIN TYP MAX UNIT
2.5 -2 -3 -4 300 400 ------------------------------------550 280 90 1.36 1.10 0.58 0.41 0.36 0.25 0.24 0.06 0.02 53 28 5.5 2 3 4 ------------------------------%/V %/mA dB VRMS V mA mA mA A % V
VOUT
2.50V>VOUT1.80V, IOUT=1mA 1.80V>VOUT1.20V, IOUT=1mA
VLNR VLDR PSRR en
VIN=VOUT+0.1V,to 5.5V IOUT=10mA IOUT = 10mA to 300mA F=1kHz, 0.45VP-P, IOUT=10mA COUT = 1F, IOUT = 1mA, CBYP = 10nF
VIH VIL I SHDN IQSHDN TSHDN TSHDN
Regulator enabled Regulator shutdown V SHDN = VIN VOUT = 0V TA = +25C TA = +25C
1.5 -----------
----0.003 0.2 145 25
--0.4 1 1 -----
V A A C C
SHDN Input Bias Current
Shutdown Supply Current THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis
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: Not tested. For design purposes, the current limit should be considered 400mA minimum. Note 4: The dropout voltage is defined as (VIN-VOUT) when VOUT is 100mV below the target value of VOUT. The performance of every G924 part, see "Typical Performance Characteristics".
Ver: 0.2 Preliminary Oct 01, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN =5V, CIN=1F, COUT=1F, V SHDN = VIN, G924-475, TA =25C, unless otherwise noted.)
G924
Load Transient
Line Transient
Short Circuit Current
70 60 50 PSRR (dB) 40 30 20 10 0 0.01 200mA
Ripple Rejection
100mA
300mA
VIN=6V ; CIN=1F ; COUT=1F CBYP=10nF ; Vr=224mv 0.1 1 10 Frequency (KHz) 100
Turn-ON
Turn-OFF
Ver: 0.2 Preliminary Oct 01, 2004
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G924
Dropout Voltage vs. IL
Overcurrent Protection Characteristics
300 250 Dropout Voltage (mV) 200 150 100 50 0 0 50
TA=85C TA=25C TA=-25C
100
150 IL (mA)
200
250
300
Output Voltage vs. Temperature
5.2 5.1 5.0 Output Voltage (V) 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 -25 -15 -5 5 15 25 35 45 55 65 75 85 Temperature (C)
VIN=5.0V VIN=5.5V IL=10mA
Output Noise
Safe Operating Area [Power Dissipation Limit]
400 350 Output Current (mA) 300 250 200 150 100 50 0 0.1 0.4 0.7 1.0 1.3 1.6 1.9 2.2 Input-Output Voltage Differential VIN-VOUT (V) Note: VIN(max) <= 5.5V
TA=85C TA=55C TA=25C 1oz Copper on SOT-23-5 Package Mounted on recommended mimimum footprint (RJA=240C/W) Maximum Recommended Output Current Still air
Max. Power Dissipation vs. Temperature
0.7 0.6 Power Dissipation (W) 0.5 0.4 0.3 0.2 0.1 0 25 35 45 55 65 75 85 95 105 115 125 Amibent Temperature TA (C)
Still Air 1oz Copper on SOT-23-5 Package Mounted on recommended mimimum footprint (RJA=240C/W)
Ver: 0.2 Preliminary Oct 01, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Pin Description
PIN
1 2 3 4 5
G924
NAME
SHDN
FUNCTION
Active-High Enable 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 heat sink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. This is a reference bypass pin. It should connect external 10nF capacitor to GND to reduce output noise. Bypass capacitor must be no less than 1nF. (CBYP 1nF) Regulator Output. Sources up to 300mA. Bypass with a 1F capacitor to GND. Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1F to GND.
GND BYP OUT VIN
Detailed Description
The block diagram of the G924 is shown in Figure 1. It consists of an error amplifier, 1.20V bandgap reference, PMOS output transistor, internal feedback voltage divider, shutdown logic, over current protection circuit, and over temperature protection circuit. 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 1.20V bandgap reference. If the feedback voltage is higher than 1.20V, 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 1.20V. Similarly, when the feedback voltage is less than
1.20V, the error amplifier causes the output PMOS to conduct more current to pull the feedback voltage up to 1.20V. 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 1.20V bandgap reference. The output voltage, VOUT, is then given by the following equation: VOUT = 1.20 (1 + R1/R2). (1)
Alternatively, the relationship between R1 and R2 is given by: R1 = R2 (VOUT / 1.20 - 1). (2)
For the output voltage versions of G924, the output voltages are 1.20V for G924-120, 2.50V for G924-250, 3.30V for G924-330, etc.
VIN SHDN
SHUTDOWN LOGIC ERROR AMP OVER CURRENT PROTECT & DYNAMIC FEEDBACK
OUT BYP
R1
OVER TEMP. PROTECT 1.2V Vref
CBYP R2
GND
Figure 1. Functional Diagram
Ver: 0.2 Preliminary Oct 01, 2004
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Global Mixed-mode Technology Inc.
Over Current Protection The G924 uses a current mirror to monitor the output current. A small portion of the PMOS output transistor's current is mirrored onto a resistor such that the voltage across this resistor is proportional to the output current. This voltage is compared against the 1.20V reference. Once the output current exceeds the limit, the PMOS output transistor is turned off. Once the output transistor is turned off, the current monitoring voltage decreases to zero, and the output PMOS is turned on again. If the over current condition persist, the over current protection circuit will be triggered again. Thus, when the output is shorted to ground, the output current will be alternating between 0 and the over current limit. The typical over current limit of the G924 is set to 550mA. Note that the input bypass capacitor of 1F must be used in this case to 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. Over Temperature Protection To prevent abnormal temperature from occurring, the G924 has a built-in temperature monitoring circuit. When it detects the temperature is above 145oC, the output transistor is turned off. When the IC is cooled down to below 120oC, the output is turned on again. In this way, the G924 will be protected against abnormal junction temperature during operation. Shutdown Mode When the SHDN pin is connected a logic low voltage, the G924 enters shutdown mode. All the analog circuits are turned off completely, which reduces the current consumption to only the leakage current. The output is disconnected from the input. When the output has no load at all, the output voltage will be discharged to ground through the internal resistor voltage divider. Operating Region and Power Dissipation Since the G924 is a linear regulator, its power dissipation is always given by P = IOUT (VIN - VOUT). The maximum power dissipation is given by:
G924
Refer to "Safe Operating Area" of the Typical Performance Characteristics is the G924 valid operating region & refer to "Maximum Power Dissipation vs. Temperature" is the maximum power dissipation of SOT-23-5. The die attachment area of the G924's lead frame is connected to pin 2, which is the GND pin. Therefore, the GND pin of G924 can carry away the heat of the G924 die very effectively. To improve the power dissipation, 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 1F capacitor on the input and a 1F capacitor on the output of the G924. 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 G924 is designed to deliver low dropout voltages and low quiescent currents in battery powered systems. Power-supply rejection is 53dB 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 G924 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 30mV. 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 G924 use a P-channel MOSFET pass transistor, their dropout voltage is a function of RDS(ON) multiplied by the load current cause the G924 use a P-channel MOSFET pass transistor, their dropout voltage is a function of RDS(ON) multiplied by the load current.
PDMAX = (TJ - TA)/JA = (150-25) / 240 = 520mW Where (TJ - TA) is the temperature difference the G924 die and the ambient air, JA, is the thermal resistance of the chosen package to the ambient air. For surface 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 240oC/Watt. (See Recommended Minimum Footprint).
Ver: 0.2 Preliminary Oct 01, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Layout Guide
An input capacitance of 1F is required between the G924 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 rout-
G924
ing 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.
Recommend Minimum Footprint
SOT-23-5
Ver: 0.2 Preliminary Oct 01, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Package Information
D C L
G924
E
H
e1 e
1
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 SYMBOLS
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
DIMENSIONS IN MILLIMETERS 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
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.
Ver: 0.2 Preliminary Oct 01, 2004
TEL: 886-3-5788833 http://www.gmt.com.tw
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