G9612 Global Mixed-mode Technology Inc. Low-Dropout, 500mA Linear Regulator with Reset Features General Description 500mA Output Current, with Foldback Current The G9612 are low-dropout, linear regulator with reset function supply 3.4V, 3.3V or 2.5V output for currents up to 500mA. They are available in a 1.0W 2 SOT 89-5 package with 0.18 inch copper heat sink. Typical dropouts are 560mV at 5V and 500mA. Other features include foldback current limiting and thermal overload protection. Limiting High Ripple Rejection ±1.5% Output Accuracy ±2% Reset Threshold Accuracy Externally Programmable Reset Time Delay Generator Internal 500mA P-Channel Pass Transistor 320µA quiescent Current Thermal Overload Protection SOT89-5 Package The reset function in G9612 detect VCC level with hysteresis, keeping it asserted for time delay determined by external capacitor. The reset output is active low open-drain output. The detection threshold are 3.9V or 4.2V. Applications The output is preset at 3.4V for the G9612A, 3.3V for the G9612B/C, and 2.5V for G9612D. The reset threshold is preset at 4.2V for G9612 A/B/D and 3.9V for G9612C. CD ROM or DVD ROM Slim-Type CD/DVD DVD Player Ordering Information PART NUMBER MARKING REGULATOR OUTPUT VOLTAGE RESET THRESHOLD VOLTAGE TEMO. RANGE PINPACKAGE G9612ATEU G9612BTEU G9612CTEU G9612DTEU G9612A G9612B G9612C G9612D 3.4 3.3 3.3 2.5 4.2 4.2 3.9 4.2 -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C SOT89-5L SOT89-5L SOT89-5L SOT89-5L Pin Configuration Typical Operation Circuit VCC G9612 RESET CD 5 4 Rpull-high 10kΩ VIN 1µF RESET G9612 VOUT CD 1 VIN 2 3 GND VOUT GND OUTPUT VOLTAGE 10µF (Tantalum or Aluminum) SOT 89-5L TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Feb 13, 2003 1 G9612 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Supply Voltage (IN or OUT to GND)..….+0.3V to +6.5V Input Voltage….…….………………………………+ 6.5V Continuous Power Dissipation (TA = +25°C)…...…0.7W Minimum footprint (θJA)…..…………………….178°C/W With 400mil x 450mil heatsink copper..………..….1.0W θJA……………………………………………..…125°C/W Output Short-Circuit Duration…….……..…..……1 min Operating Temperature Range……….-40°C to +85°C Junction Temperature…………….……….……+160°C Storage Temperature Range….….…-65°C to +160°C Lead Temperature (soldering, 10sec)……...…+300°C 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, CIN=1µF, COUT=10µF, TJ =TA=25°C (Note3), unless otherwise noted. Typical values for regulators are at VIN =5V. PARAMETER Input Voltage SYMBOL CONDITIONS VIN Output Voltage (Note 1) VOUT Load Regulation Line Regulation ∆VLDR ∆VLNR Dropout Voltage (Note 2) ∆VDO G9612A G9612B/C G9612D IOUT=1mA to 500mA, VIN=VOUT +1V (VOUT+0.5V) ≤ VIN ≤ 6V, IOUT =25mA G9612A/B/C IOUT=500mA G9612D MIN 2.5 3.35 3.25 2.45 -8 Output Noise Quiescent Current Foldback Current Limit Foldback Voltage Thermal Shutdown Temperature Thermal Shutdown Hysteresis PSRR en IQ ILIM f=120HZ, IOUT=30mA f=120HZ, IOUT=300mA 20Hz to 100kHz, IOUT=30mA~500mA. VOUT<VFOLDBACK VOUT>VFOLDBACK VFOLDBACK TSD ∆TSD Reset Threshold VTH- Reset Threshold Hysteresis VHYS Reset Threshold Tempco CD Delay Pin Threshold Voltage CD Pin Sink Current CD Pin Pullup Resistance RESET Output Current Low RESET Function Operating Voltage VTCD ICD RD IOL VOP 260 650 0.6 G9612A/B/D G9612C G9612A/B/D G9612C 4.11 3.81 VCC = 5V VCC=1.5V, VCD=0.5V 3.5 3 100 8 VCC=2.5V, V RESET =0.4V RESET sink current>10µA MAX UNITS 6.0 3.45 3.35 2.55 17 8 610 V 3.4 3.3 2.5 8 0.3 560 650 40 Parameter Tempco VOUT Ripple Rejection TYP 70 65 320 320 400 900 0.78 160 30 4.2 3.9 150 130 40 3.9 4.3 200 11.5 0.7 700 V mV mV mV ppm/°C dB µVRMS 450 580 1200 0.95 µA mA 4.29 3.99 V V °C °C mV 4.3 400 0.85 ppm/°C V mA kΩ mA V Note 1: (VIN-VOUT) is limited to keep the product (IOUT x (VIN - VOUT)) from exceeding the package power dissipation limits. Note 2: Dropout Voltage is (VIN - VOUT) when VOUT falls to 100mV below its nominal value at VIN = VOUT+1V. For example, the G9612 is tested by measuring the VOUT at VIN = VOUT+1V, then VIN is lowered until VOUT falls 100mV below the measured value. The difference (VIN - VOUT) is then measured and defined as ∆VDO. Note 3: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Feb 13, 2003 2 G9612 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VIN=5V,CIN=COUT=10µF, CONT=VIN, TJ=25°C, unless otherwise noted) CONT Pin vs. Output Load transient Load Transient Line Transient Line Transient Line Transient TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Feb 13, 2003 3 Global Mixed-mode Technology Inc. G9612 Typical Performance Characteristics (continued) Over Current Response Short Circuit Response Power Supply Rejection Ratio Power Supply Rejection Ratio RL=100Ω CL=10µF RL=22Ω CL=10µF Power Supply Rejection Ratio Power Supply Rejection Ratio RL=11Ω CL=10µF RL=6.6Ω CL=10µF TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Feb 13, 2003 4 G9612 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Safe Operating Area Safe Operating Area 0.55 0.55 0.5 0.45 Load Current(A) Load Current(A) 0.5 0.4 0.35 0.3 0.45 0.4 0.35 0.25 minimum footprint 400mil×450mil heatsink 0.2 0.3 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 Input-Output Voltage Differential(V) Inpout -Output Voltage Differential(V) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Feb 13, 2003 5 G9612 Global Mixed-mode Technology Inc. Pin Description PIN NO. PIN NAME 1 2 3 4 5 VIN GND VOUT CD RESET PIN FUNCTION Regulator Input. Supply voltage can range from 2.5V to 6V. Ground Regulator Output. Sources up to 500mA. External Programmable time delay is set by the capacitor connect to CD pin. RESET Open-Drain Output remains low while VIN is below the reset threshold, and for delay time set by CD after VIN rises above the reset threshold. VIN － ＋ MOSFET DRIVER WITH FOLDBACK CURRENT LIMIT P RESET VOUT THERMAL PROTECTION 1.24V REFERENCE － ＋ RD CD R1 R2 GND Figure 1. Functional Diagram Detailed Description The G9612 also offer reset function to detect the level of VIN. They assert a reset signal whenever VIN supply voltage declines below a preset threshold (VTH), keeping it asserted for time delay set by capacitor connected to CD pin, after VIN has resen above the high reset threshold (VTH + VHYS). The RESET is an active low, open-drain output. The G9612 are low-dropout, low-quiescent current linear regulators with reset function The regulator in G9612 supply 3.4V, 3.3V or 2.5V output for load currents up to 500mA. The reset function detect VIN. As illustrated in Figure 1, they consist of a 1.24V reference, error amplifier, MOSFET driver, P-channel pass transistor, and internal feedback voltage divider, reset threshold comparator and time delay generator. Internal P-Channel Pass Transistor The G9612 feature a 500mA P-channel MOSFET pass transistor. This provides several advantages over similar designs using PNP pass transistors, including longer battery life. The P-channel MOSFET requires no base drive, which reduces quiescent current considerably. PNP based regulators waste considerable amounts of current in dropout when the pass transistor saturates. They also use high base-drive currents under large loads. The G9612 do not suffer from these problems and consume only 320µA of quiescent current. The 1.24V bandgap reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the P-channel pass transistor. If the feedback voltage is lower than the reference, the pass transistor gate is pulled lower, allowing more current to pass and increasing the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up, allowing less current to pass to the output. Additional blocks of linear regulator include a foldback current limiter, reverse current protection, and thermal sensor. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Feb 13, 2003 6 Global Mixed-mode Technology Inc. Foldback Current Limiting The worst-case thermal resistance from junction to air (θJA) requirements are: The G9612 also include a foldback current limiter. It monitors and controls the pass transistor’s gate voltage, estimating the output current and limiting it to 900mA for output voltages above 0.78V. If the output voltage drops below 0.78V, implying a short-circuit condition, the output current is limited to 400mA. θJA = (150°C -TA) PD Use larger copper pad area to obtain specific heat sink thermal resistance values for larger output current, higher input-output difference, and higher ambient temperature. Thermal Overload Protection Thermal overload protection limits total power dissipation in the G9612. When the junction temperature exceeds TJ = +160°C, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor will turn the pass transistor on again after the IC’s junction temperature cools by 30°C, resulting in a pulsed output during thermal overload conditions. CD Capacitor Selection The reset timeout delay is set by internally pull-up RD (typical value 200kΩ) and external CD. When the voltage at CD pin exceeds the buffer threshold, typically 0.85 VCC, the RESET output high. The voltage detector and buffer have built-in hysterisis to prevent erratic reset operation. For CD = 0.1µF, typical reset time delay is 10ms. Thermal overload protection is designed to protect the G9612 in the event of fault conditions. For continual operation, the absolute maximum junction temperature rating of TJ = +160°C should not be exceeded. Regulator Output Capacitor Selection and Regulator Stability Normally, use capacitors 0.1µF minimum on the input and 10µF minimum on the output of the G9612. The larger input capacitor values provide better supply noise rejection and line-transient response. Improve load transient response, stability, and power-supply rejection by using large output capacitors. For stable operation over the full temperature range and with load current up to 500mA, 10µF tantalum or 47µF aluminum minimum is recommended. Too small capacitors with small ESR can result in oscillation. Operating Region and Power Dissipation Maximum power dissipation of the G9612 depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipation across the device is P = IOUT (VIN-VOUT). The resulting maximum power dissipation is: PMAX= G9612 (TJ-TA) (θJC+θCA) Transient Considerations The Typical Operating Characteristics show the G9612 load-transient response. Two components of the output response can be observed on the load-transient graphs—a DC shift from the output impedance due to the different load currents, and the transient response. Typical transients for step changes in the load current from 5mA to 500mA are 0.1V. Increasing the output capacitor’s value attenuates transient spikes. where (TJ -TA) is the temperature difference between the G9612 die junction and the surrounding air, θJC is the thermal resistance of the package chosen, and θCA is the thermal resistance through the printed circuit board, copper traces and other materials to the surrounding air. The thermal resistance of SOT89-5 with 0.18 inch2 copper heat sink isθJA = 125°C/W. The power dissipation of G9612 is: PD = (VIN - VOUT) x IOUT TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Feb 13, 2003 7 G9612 Global Mixed-mode Technology Inc. Package Information A C D F L E B I K H J G SYMBOL A B C D E F G H I J K L DIMENSION IN MM MIN. MAX. DIMENSION IN INCH MIN. MAX. 4.40 4.05 1.50 1.30 2.40 0.80 0.173 0.159 0.059 0.051 0.094 0.031 4.60 4.25 1.70 1.50 2.60 ----3.00 REF 0.181 0.167 0.067 0.059 0.102 ----0.118 REF 1.50 REF 0.059 REF 0.40 0.52 0.016 0.020 1.40 0.35 1.60 0.41 0.055 0.014 0.063 0.016 5º TYP 5º TYP Taping Specification Feed Direction SOT 89-5L 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: 1.2 Feb 13, 2003 8