G924 Global Mixed-mode Technology Inc. 300mA Low-Noise LDO Regulators Features General Description Low, 90µA 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 < 1µA Low Output Noise at 28µVRMS Stable with low cost ceramic capacitors Output voltage: 1.20V~5.00V 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 90µA. In the shutdown mode, the maximum supply current is less than 1µA. 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 SHDN GND 1 2 Typical Application Circuit 5 VIN VIN ＋C G924 BATTERY G924 IN _ 1µF 4 3 BYP OUT SOT-23-5 COUT 1µF SHDN GND BYP OUTPUT VOLTAGE OUT CBYP 10nF Fixed mode TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 1 G924 Global Mixed-mode Technology Inc. Ordering Information ORDER NUMBER ORDER NUMBER (Pb free) MARKING VOLTAGE TEMP. RANGE PACKAGE G924-330T1U G924-330T1Uf 94AXx 3.30V -40°C~ +85°C SOT-23-5 For other output voltage, please contact us at [email protected] Note: T1: SOT-23-5 U: Tape & Reel Selector Guide ORDER NUMBER ORDER NUMBER (Pb free) OUTPUT VOLTAGE (V) MARKING 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 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 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 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 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 2 G924 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Operating Temperature Range…….....-40°C to +85°C Junction Temperature………………...………+150°C θ JA (1) ….…..…………….……….…..…..240°C/Watt Storage Temperature Range……….-65°C to +150°C Reflow Temperature (soldering, 10sec)…..…….260°C 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 = +25°C) SOT-23-5………..…………..……….……….…520mW Note (1): See Recommended Minimum Footprint 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 =25°C, unless otherwise noted.) (Note 1) PARAMETER Input Voltage (Note 2) Output Voltage Accuracy SYMBOL CONDITION VIN VOUT MIN TYP MAX UNIT 2.5 --- 5.5 VOUT≥2.50V, IOUT=1mA -2 --- 2 2.50V>VOUT≥1.80V, IOUT=1mA -3 --- 3 1.80V>VOUT≥1.20V, IOUT=1mA -4 --- 4 Maximum Output Current V % 300 --- --- mA Current Limit (Note 3) ILIM 400 550 --- mA Short Circuit Current Isc --- 280 --- mA Ground Pin Current IQ µA Dropout Voltage (Note 4) VDROP IOUT =300mA --- 90 --- VOUT=1.50V VOUT=1.80V VOUT=2.50V ------- 1.36 1.10 0.58 ------- VOUT=3.00V --- 0.41 --- VOUT=3.30V VOUT=4.75V ----- 0.36 0.25 ----- VOUT=5.00V --- 0.24 --- V Line Regulation ∆VLNR VIN=VOUT+0.1V,to 5.5V IOUT=10mA --- 0.06 --- %/V Load Regulation ∆VLDR IOUT = 10mA to 300mA --- 0.02 --- %/mA Ripple Rejection Output Voltage Noise (10Hz to 100kHz) PSRR F=1kHz, 0.45VP-P, IOUT=10mA --- 53 --- dB en COUT = 1µF, IOUT = 1mA, CBYP = 10nF --- 28 --- µVRMS VIH Regulator enabled 1.5 --- --- VIL Regulator shutdown --- --- 0.4 SHUTDOWN SHDN Input Threshold V SHDN Input Bias Current I SHDN V SHDN = VIN TA = +25°C --- 0.003 1 µA Shutdown Supply Current IQSHDN VOUT = 0V TA = +25°C --- 0.2 1 µA TSHDN --- 145 --- °C ∆TSHDN --- 25 --- °C THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis Note 1: Limits is 100% production tested at TA= +25°C. 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”. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 3 G924 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VIN =5V, CIN=1µF, COUT=1µF, V SHDN = VIN, G924-475, TA =25°C, unless otherwise noted.) Line Transient Load Transient Short Circuit Current Ripple Rejection 70 100mA 60 PSRR (dB) 50 300mA 30 20 10 0 0.01 Turn-ON 200mA 40 VIN=6V ; CIN=1µF ; COUT=1µF CBYP=10nF ; Vr=224mv 0.1 1 10 Frequency (KHz) 100 Turn-OFF TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 4 G924 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Dropout Voltage vs. IL Overcurrent Protection Characteristics 300 Dropout Voltage (mV) 250 200 TA=85°C 150 TA=25°C 100 TA=-25°C 50 0 0 50 100 Output Voltage vs. Temperature 150 IL (mA) 200 250 300 Output Noise 5.2 5.1 IL=10mA Output Voltage (V) 5.0 4.9 VIN=5.5V 4.8 4.7 4.6 VIN=5.0V 4.5 4.4 4.3 4.2 -25 -15 -5 5 15 25 35 45 55 65 75 85 Temperature (°C) Safe Operating Area [Power Dissipation Limit] Max. Power Dissipation vs. Temperature 0.7 400 Maximum Recommended Output Current 300 250 TA=85°C 200 TA=55°C TA=25°C 150 100 1oz Copper on SOT-23-5 Package Mounted on recommended mimimum footprint (RθJA=240°C/W) 50 Still Air 1oz Copper on SOT-23-5 Package Mounted on recommended mimimum footprint (RθJA=240°C/W) 0.6 Still air Power Dissipation (W) Output Current (mA) 350 0.5 0.4 0.3 0.2 0.1 0 0 0.1 0.4 0.7 1.0 1.3 1.6 1.9 25 2.2 35 45 55 65 75 85 95 105 115 125 Amibent Temperature TA (°C) Input-Output Voltage Differential VIN-VOUT (V) Note: VIN(max) <= 5.5V TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 5 G924 Global Mixed-mode Technology Inc. Pin Description PIN NAME FUNCTION 1 SHDN Active-High Enable Input. A logic low reduces the supply current to less than 1µA. Connect to IN for normal operation. 2 GND Ground. This pin also functions as a heat sink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. 3 BYP 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) 4 OUT Regulator Output. Sources up to 300mA. Bypass with a 1µF capacitor to GND. 5 VIN Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1µF to GND. Detailed Description 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: 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 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 － OVER CURRENT PROTECT & DYNAMIC FEEDBACK ERROR AMP SHUTDOWN LOGIC ＋ OUT BYP R1 OVER TEMP. PROTECT CBYP 1.2V Vref R2 GND Figure 1. Functional Diagram TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 6 G924 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 1µF 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. 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. 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. 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. 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. 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. 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 1µF capacitor on the input and a 1µF 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 (10µF) may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. 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. 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: 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)/θJA = (150-25) / 240 = 520mW Where (TJ – TA) is the temperature difference the G924 die and the ambient air, θJA, 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). TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 7 Global Mixed-mode Technology Inc. Layout Guide 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. An input capacitance of 1µF 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- Recommend Minimum Footprint SOT-23-5 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 8 G924 Global Mixed-mode Technology Inc. Package Information C D L E H θ1 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 SYMBOLS MIN DIMENSIONS IN MILLIMETERS NOM MAX A 1.00 1.10 1.30 A1 A2 0.00 0.70 ----0.80 0.10 0.90 b C 0.35 0.10 0.40 0.15 0.50 0.25 D E 2.70 1.40 2.90 1.60 3.10 1.80 e e1 H --------2.60 1.90(TYP) 0.95 2.80 --------3.00 L θ1 0.37 ------ ----- 1º 5º 9º Taping Specification PACKAGE Q’TY/REEL SOT-23-5 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. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.2 Preliminary Oct 01, 2004 9