G914G

Global Mixed-mode Technology Inc. G914X 300mA High PSRR, Low-Noise LDO Regulators Features Ultra Low Output Noise⎯30µV (rms) Ultra Low 55µA No-Load Supply Current Ultra Low Dropout 70mV @ 50mA Load Guarantee 300mA Output Current Over-Temperature and Short-Circuit Protection Fixed Mode: 2.70V (G914A), 2.80V (G914B) 3.00V (G914C), 3.30V (G914D) 2.50V (G914E), 2.85V (G914F) 1.50V (G914G), 1.80V (G914H) Adjustable Mode: from 1.25V to 5.50V (G914Z) PSRR=70dB Max. Supply Current in Shutdown Mode < 1µA Stable with low cost ceramic capacitors General Description The G914X is a low supply current, high PSRR low dropout linear regulator that comes in a space saving SOT-23-5 package. The supply current at no-load is 55µA. In the shutdown mode, the maximum supply current is less than 1µA. Operating voltage range of the G914X is from 2.5V to 5.5V. The over-current protection limit is set at 500mA typical and 400mA minimum. An over- temperature protection circuit is built-in in the G914X to prevent thermal overload. These power saving features make the G914X ideal for use in the battery-powered applications such as notebook computers, cellular phones, and PDA’s. Applications Notebook Computers Cellular Phones PDA Hand-Held Devices Battery-Powered Application Ordering Information ORDER NUMBER G914A G914B G914C G914D G914E G914F G914G G914H G914Z ORDER NUMBER (Pb free) G914Af G914Bf G914Cf G914Df G914Ef G914Ff G914Gf G914Hf G914Zf MARKING 4Axx 4Bxx 4Cxx 4Dxx 4Exx 4Fxx 4Gxx 4Hxx 4Zxx VOLTAGE 2.70V 2.80V 3.00V 3.30V 2.50V 2.85V 1.50V 1.80V Adjustable TEMP. RANGE -40°C~ +85°C -40°C~ +85°C -40°C~ +85°C -40°C~ +85°C -40°C~ +85°C -40°C~ +85°C -40°C~ +85°C -40°C~ +85°C -40°C~ +85°C PACKAGE SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 Pin Configuration G914A~G914H IN 1 5 OUT Typical Application Circuit G914A~G914H IN IN OUT OUTPUT VOLTAGE ＋ GND 2 BATTERY CIN － 1µF SHDN BYP GND SHDN 3 4 BYP CBYP 10nF COUT 4.7µF SOT-23-5 G914Z Fixed mode G914Z IN OUT R1 ＋ CIN 1µF BATTERY － SET SHDN GND R2 5 OUT OUTPUT VOLTAGE IN 1 GND 2 COUT 4.7µF SHDN 3 4 SET SOT-23-5 Adjustable mode Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. Absolute Maximum Ratings VIN to GND. . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +7V Output Short-Circuit Duration. . . . . . . . . . .. . . . . .Infinite All Other Pins to GND. . . . . . . . . . .-0.3V to (VIN + 0.3V) Thermal Resistance Junction to Ambient, (θJA) SOT-23-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240°C/W G914X Operating Temperature Range. . . . . . .-40°C to +85°C Juction Temperature. . . . . . . . . . . . . . . . . . . . .+150°C Storage Temperature Range. . . . . . . -65°C to +160°C Reflow Temperature (soldering, 10sec) . . . . . . 260°C 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=VOUT(STD)+1V, V SHDN =VIN, TA=TJ =25°C, unless otherwise noted.) (Note 1) PARAMETER Input Voltage (Note 2) Output Voltage Accuracy Maximum Output Current Current Limit (Note 3) Ground Pin Current ILIM ILOAD = 0mA IQ VIN =3.6V IOUT = 1mA IOUT = 50mA, VOUT ≥ 2.7V Version VO (NOM) ≥ 3.0V IOUT = 150mA Dropout Voltage (Note 4) VDROP 2.5V≤VO (NOM) ≤2.85V VO (NOM) = 1.8V VO (NOM) = 1.5V VO (NOM) ≥ 3.0V IOUT =300mA 2.5V≤VO (NOM) ≤2.85V VO (NOM) = 1.8V VO (NOM) = 1.5V Line Regulation Load Regulation (Note 5) Power Supply Rejection Ratio Output Voltage Temperature Coefficient Output Voltage Noise (10Hz to 100kHz) (G914H) en VIN=VOUT+1V ΔVLNR ΔVLDR PSRR VIN=VOUT+100mV to 5.5V, IOUT = 1mA IOUT = 10mA to 300mA IOUT = 10mA CBYP = 10nF, f = 120HZ ILOAD = 50mA ILOAD = 300mA SYMBOL VIN CONDITIONS Variation from specified VOUT, IOUT=1mA,VOUT≥2.5V version MIN Note2 -2 -3 -4 ----------------------------------------------- TYP --------300 500 55 145 265 2 70 230 250 380 510 450 500 760 910 0.1 0.1 70 30 52 35 30 26 MAX UNITS 5.5 2 3 4 ----120 ----------------600 660 1500 1800 0.28 1 ------------µVRMS %/V % dB ppm/°C mV µA mA mA % V VOUT For G914H, IOUT=1mA For G914G, IOUT=1mA ΔVO/ΔT IOUT = 50mA, TJ = 25°C to 125°C COUT = 1µF, IOUT = 150mA, CBYP=1nF COUT = 1µF, IOUT = 150mA, CBYP=10nF COUT = 1µF, IOUT = 150mA, CBYP = 100nF COUT = 1µF, IOUT = 1mA, CBYP = 10nF Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 2 Global Mixed-mode Technology Inc. Electrical Characteristics (VIN=VOUT(STD)+1V, V SHDN =VIN, TA=TJ =25°C, unless otherwise noted.) PARAMETER SHUTDOWN SHDN Input Threshold SHDN Input Bias Current G914X MIN 1.5 ----------- SYMBOL VIH VIL ISHDN IQ SHDN TSHDN ΔTSHDN VSET ISET CONDITIONS Regulator enabled Regulator shutdown V SHDN = VIN VOUT = 0V TA = +25°C TA = +25°C TYP ----0.003 --150 15 1.25 5 MAX UNITS --0.4 0.1 1 ----1.275 30 V µA Shutdown Supply Current THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis SET INPUT SET Reference Voltage SET Input Leakage Current Note 1: Note 2: Note 3: Note 4: Note 5: °C °C V nA VIN = 2.5V to 5.5V,IOUT = 1mA VSET = 1.3V 1.225 --- Limits is 100% production tested at T A = +25 ° C. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. VIN (min)=VOUT (STD)+VDROPOUT Not tested. For design purposes, the current limit should be considered 400mA minimum to 600mA maximum. The dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT for VIN = VOUT +1V. The performance of every G914X version, see “Typical Performance Characteristics”. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 1mA to 300mA. Changes in output due to heating effects are covered by the thermal regulation specification. Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 3 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VIN = V O+1V, CIN=1µF, COUT=1µF, V SHDN = VIN, G914D, TA =25°C, unless otherwise noted.) Output Voltage vs. Load Current 3.340 3.330 3.320 400 G914X Ground Current vs. Load Current G914D 350 Ground Current (µA) Output Voltage (V) 300 250 200 150 100 50 0 VIN=3.6V No Load 3.310 3.300 3.290 3.280 3.270 3.260 3.250 3.240 0 50 100 150 200 250 300 0 50 100 150 200 250 300 Load Current (mA) Load Current (mA) Output Voltage vs. Input Voltage 3.5 3.0 400 350 Supply Current vs. Input Voltage No Load ILOAD=300mA 300 Output Voltage (V) Supply Current (µA) 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 5 6 250 200 150 100 50 ILOAD=50mA ILOAD=0mA 0 0 1 2 3 4 5 6 Input Voltage (V) Input Voltage (V) Dropout Voltage vs. Load Current 1000 900 Ouptut Noise 10HZ to 100kHZ TA=25°C G914H G914E Dropout Voltage (mV) 800 700 600 500 400 300 200 100 0 0 50 100 150 200 250 300 G914G Top to down G914A G914B G914F G914C G914D Loading (mA) Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 4 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Ground Current vs. Temperature 100 G914X SHDN Input Bias Current vs. Temperature 0.20 Ground Current (µA) 80 SHDN Input Bias Current (µA) G914D VIN = 4.3V IOUT =0A 0.10 G914D VIN=4.3V VSHDN=VIN 60 0.00 40 -0.10 20 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 10 11 12 13 0000 -0.20 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 10 11 12 13 0000 Junction Temperature TJ (°C) Junction Temperature TJ (°C) Shutdown Supply Current vs. Temperature 1.00 3.36 G914D VIN = 4.3V Output Voltage vs. Temperature 3.34 G914D ILOAD=1mA VIN=5.5V Shutdown Supply Current(µA) 0.60 Output Voltage (V) 3.32 0.20 3.30 VIN=4.3V 3.28 VIN=3.4V 3.26 -0.20 -0.60 -1.00 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 10 11 12 13 0000 3.24 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 10 11 12 13 0000 Junction Temperature TJ (°C) Junction Temperature TJ (°C) Dropout Voltage vs. Temperature 400 350 G914D Dropout Voltage (mV) 300 ILOAD=150mA 250 200 150 100 50 ILOAD=0mA 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 10 11 12 13 0000 ILOAD=50mA Junction Temperature TJ (°C) Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 5 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Line Transient G914X Load Transient Load Transient 90 80 70 Power Supply Rejection Ripple ILOAD =10mA PSRR (dB) 60 50 ILOAD=150mA 40 30 20 10 0 0.01 0.1 1 10 100 G914E V IN =5V Frequency (KHz) Output Noise vs. Bypass Capacitance 70 60 G914H VIN=2.8V TA=25°C COUT=1µF 70 60 Output Noise vs. Load Current G914H VIN=2.8V TA=25°C COUT=1µF 40 30 20 10 0 Output Noise (µVrms) Output Noise (µVrms) 0.1 50 40 30 20 10 0 0.001 0.01 50 1 10 100 1000 Bypass Capacitance (µF) Load Current (mA) Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 6 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) G914X Power Off Response Waveform Power On Response Waveform Shutdown Delay Waveform Shutdown Delay Waveform Turn-On Time vs. Bypass Capacitance 100000 Propagation Delay Time 10000 Turn-Off Time vs. Bypass Capacitance 1000 Propagation Delay Time Time (µs) G914D ILOAD =150mA CIN=COUT=1µF VIN=4.3V power already VSHDN=0 to 4.3V 100 Time (µs) 1000 100 Fall Time 10 10 Rise Time 1 0.1 1 G914D ILOAD =150mA CIN=COUT=1µF VIN=4.3V power already VSHDN=4.3V to 0V 1 10 100 0.1 1 10 100 Bypass Capactor (nF) Bypass Capacitor (nF) Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 7 Global Mixed-mode Technology Inc. Pin Description PIN G914A~H G914Z 1 2 3 4 1 2 3 --- G914X NAME IN GND SHDN FUNCTION Regulator Input. Supply voltage can range from +2.5V to +6.0V. Bypass with 1µF to GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maximize thermal dissipation. Active-Low Shutdown Input. A logic low reduces the supply current to less than 1µA. Connect to IN for normal operation. 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) 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. The adjustable output voltage, VOUT, is then given by the following equation: VOUT = 1.25 (1 + R1/R2), Reference to Typical Application Circuit in Page 1. Regulator Output. Sources up to 300mA. Bypass with a 4.7µF, ＜0.2Ω typical ESR capacitor to GND. BYP --- 4 SET 5 5 OUT Detailed Description The block diagram of the G914X is shown in Figure 1. It consists of an error amplifier, 1.25V 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 1.25V 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 conduct more current to pull the feedback voltage up to 1.25V. Thus, through this feedback action, the error amplifier, output PMOS, and the voltage divider 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: VOUT = 1.25 (1 + R1/R2). (1) Alternatively, the relationship between R1 and R2 is given by: R1 = R2 (VOUT / 1.25 + 1). (2) For the output voltage versions of G914X, the output voltages are 2.7V for G914A, 2.8V for G914B, 3.0V for G914C, 3.3V for G914D, and 2.5V for G914E, 2.85V for G914F, 1.50V for G914G and 1.80V for G914H. IN SHDN － SHUTDOWN LOGIC ERROR AMP OVER CURRENT PROTECT & DYNAMIC FEEDBACK ＋ OUT BYP R1 OVER TEMP. PROTECT 1.25V Vref CBYP R2 GND Figure 1. Functional Diagram Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 8 Global Mixed-mode Technology Inc. Over Current Protection The G914X use 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 1.25V 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 G914X is set to 500mA. 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. Over Temperature Protection To prevent abnormal temperature from occurring, the G914X has a built-in temperature monitoring circuit. When it detects the temperature is above 150°C, the output transistor is turned off. When the IC is cooled down to below 135°C, the output is turned on again. In this way, the G914X will be protected against abnormal junction temperature during operation. Shutdown Mode When the SHDN pin is connected a logic low voltage, the G914X 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 G914X is a linear regulator, its power dissipation is always given by P = IOUT (VIN – VOUT). The maximum power dissipation is given by: G914X The die attachment area of the G914X’s lead frame is connected to pin 2, which is the GND pin. Therefore, the GND pin of G914X can carry away the heat of the G914X 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 4.7µF capacitor on the output of the G914X. 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. For stable operation over the full temperature range, with load currents up to 120mA, a minimum of 4.7µF is recommended. Power-Supply Rejection and Operation from Sources Other than Batteries The G914X is designed to deliver low dropout voltages and low quiescent currents in battery powered systems. Power-supply rejection is 70dB 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 G914X 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 0mA to 100mA is 12mV. 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 G914X use a P-channel MOSFET pass transistor, their dropout voltage is a function of RDS(ON) multiplied by the load current cause the G914X 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 G914X 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 240°C/Watt. (See Recommended Minimum Footprint). Refer to Figure 2 is the G914X valid operating region (Safe Operating Area) & refer to Figure 3 is maximum power dissipation of SOT-23-5. Ver: 1.8 Jul 24, 2007 TEL: 886-3-5788833 http://www.gmt.com.tw 9 Global Mixed-mode Technology Inc. Layout Guide An input capacitance of ≅ 1µF is required between the G914X 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. G914X 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 4 is G914X PCB recommended layout. Safe Operating Area [Power Dissipation Limit] 400 350 300 Output Current (mA) 250 200 150 100 50 0 0.1 0.4 0.7 1.0 1.3 1.6 1.9 2.2 1oz Copper on SOT-23-5 Package Mounted on recommended mimimum footprint (RJA=240°C/W) Maximum Power Dissipation of SOT-23-5 0.7 Still Air 1oz Copper on SOT-23-5 Package Mounted on recommended mimimum footprint (RθJA=240°C/W) Maximum Recommended Output Current Still air 0.6 0.5 Power Dissipation (W) 0.4 0.3 0.2 0.1 0 25 TA=85° TA=55°C TA=25°C 35 45 55 65 75 85 95 105 115 125 Input-Output Voltage Differential VIN-VOUT (V) Amibent Temperature TA (°C) Note: VIN(max)