ISSUED DATE :2005/07/05 REVISED DATE : GQ2131 C M O S P o s i t i v e Vo l t a g e R e g u l a t o r Description The GQ2131 is a fixed 1.2V of positive, linear regulators feature low quiescent current (60 A typ.) with low dropout voltage, making them ideal for battery applications. This rugged device has both Thermal Shutdown, and Current Fold-back to prevent device failure under the “Worst” of operating conditions. An additional feature is a “Power Good” detector, which pulls low when the output is out of regulation. The GQ2131 is stable with an output capacitance of 2.2 F or greater. Features Very Low Dropout Voltage Guaranteed 150mA output Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Accurate± 3.0% Power Good Output Function Power-saving Shutdown Mode Low Temperature coefficient Functional Block Diagram Applications Battery Powered Widgets Instrumentation Wireless Devices PC Peripherals Portable Electronics Cordless Phones Electronic Scales Package Dimensions REF. A B C D E F Millimeter Min. Max. 2.70 3.10 2.60 3.00 1.40 1.80 0.30 0.55 0 0.10 0° 10° REF. G H I J K L Dimensions Millimeter 1.90 REF. 1.20 REF. 0.12 REF. 0.37 REF. 0.60 REF. 0.95 REF. Typical Application Circuit 1/5 ISSUED DATE :2005/07/05 REVISED DATE : Fig 1. Typical Application Schematic Fig 2. Typical Application For Processor VID Code Power Sequencing Schematic Pin Description Pin Number 1 2 Pin Name VIN Gnd 3 EN 4 5 PG VOUT Pin Function Supply Input Ground Enable/Shutdown (Input): CMOS compatible input. Logic high= enable; Logic low= shutdown. Do not leave open. Power Good Output Regulator Output Ordering Information ( contd. ) Part Number GQ2131-12 Marking 1C122 XXXX Output Voltage Part Number Marking Output Voltage 1.2V Detailed Description The GQ2131 of COMS regulator contains a PMOS pass transistor, voltage reference, error amplifier, over -current protection, thermal shutdown and Power Good function. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds 150 , or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 . The GQ2131 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GQ2131 also incorporates current fold-back to reduce power dissipation when the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts. External Capacitors The GQ2131 is stable with an output capacitance to ground of 2.2 F or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1 F ceramic capacitor with a 10 F Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1 F to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “Quiet” ground termination is desirable. This can be achieved with a “Star” connection. Enable The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1 A. This pin behaves much like an electronic switch. 2/5 ISSUED DATE :2005/07/05 REVISED DATE : Power Good The GQ2131 includes the Power Good feature. When the output is not within 15% of the specified voltage, it pulls low. This can occur under the following conditions: 1) Input Voltage too low. 2) During Over-Temperature. 3) During Over-Current. 4) If output is pulled up. (Note: PG pin is an open-drain output.) Absolute Maximum Ratings Parameter Symbol Ratings Unit Input Max Voltage VIN 7 V Output Current IOUT PD/( VIN- VO) mA GND-0.3 to VIN+0.3 V Input, Output Voltage Operating Ambient Temperature Junction Temperature Maximum Junction Temperature Thermal Resistance Power Dissipation( T=100 ) Topr -40 ~ +85 Tj -40 ~ +125 Tj Max 150 ja 260 /W PD 380 mW EDS Classification B Electrical Characteristics Ta=25 Parameter Output Voltage Current Limit Load Regulation Dropout Voltage Quiescent Current Ground Pin Current Line Regulation Input Voltage Over Temperature Shutdown Over Temperature Hysterisis Symbol VO ILIM REGLOAD VDROPOUT IQ IGND REGLINE VIN OTS OTH Output Voltage Temperature Coefficient TC Power Supply Rejection PSRR Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current Shutdown Output Voltage Output Under Voltage PG Leakage Current PG Voltage Low VPG Delay eN VEH VEL IEH IEL ISD VO,SD VUV ILC VOL TPGD VIN=2.7V, VEN= VIN, O=100uA unless otherwise noted Condition Min TYP Max Unit IO=0.1mA -3.0% - 3.0% V VO<0.1V IO=0.1mA to 150mA IO=150mA, VOUT=VO-2% 150 -4 - 350 1 - 4 1300 mA % mV VIN=6V, IO=0mA, VO=VO(NOM) VIN=6V, IO=1mA to150mA IO=0.1mA, VIN=2.7V to 6V -0.3 60 65 - 80 0.3 A A % 2.7 - 6 V - 150 - - 30 - - 30 - Io=100mA Co=2.2 F f=10Hz to 100kHz Io=10mA ppm/ f=1kHz - 50 - f=10kHz - 20 - f=100kHz - 15 - Co=2.2 F - 30 - Vrms 1.6 0 0 1.5 0.1 0.1 0.5 0.1 - VIN 0.4 1 0.4 95 0.1 5 V V A A A V %Vo(NOM) A V ms VEN=VIN VEN= 0V VIN=5V, VO=0V, VEN=0V Output Loading 1200 , VEN=0V PG ON @ % of VOUT VPG=6V, PG is off ISINK=0.1mA See Timing Diagram on page 5 dB Note 1: VIN (MIN) =VOUT+VDROPOUT 3/5 ISSUED DATE :2005/07/05 REVISED DATE : Characteristics Curve 4/5 ISSUED DATE :2005/07/05 REVISED DATE : Timing Diagram Important Notice: All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM. GTM reserves the right to make changes to its products without notice. GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems. GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory: Taiwan: No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C. TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785 China: (201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165 5/5