ISSUED DATE :2006/02/24 REVISED DATE : GSC2127 7 5 0 m A 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 GSC2127 series of positive, linear regulators feature low quiescent current (45 A typ.) with low dropout voltage, making then ideal for battery applications. Output voltages are set at the factory and trimmed to 1.5% accuracy. These rugged devices have 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 GSC2127 is stable with an output capacitance of 4.7 F or greater. Features Very Low Dropout Voltage Guaranteed 750mA output Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Low Temperature Coefficient Noise Reduction Bypass Capacitor Power-saving Shutdown Mode Power Good Output Function Functional Block Diagram Applications Battery Powered Widgets Instrumentation Wireless Devices PC Peripherals Portable Electronics Package Dimensions REF. A B C D E F Millimeter Min. Max. 5.80 4.80 3.80 0° 0.40 0.19 6.20 5.00 4.00 8° 0.90 0.25 REF. M H L J K G Millimeter Min. Max. 0.10 0.25 0.35 0.49 1.35 1.75 0.375 REF. 45° 1.27 TYP. Typical Application Circuit GSC2127 Page: 1/6 ISSUED DATE :2006/02/24 REVISED DATE : Absolute Maximum Ratings Parameter Symbol Ratings Unit Input Max Voltage VIN 8 V Output Current IOUT PD/( VIN- VO) mA Output Voltage VOUT 1.5~3.3 V Operating Ambient Temperature Topr -40 ~ +85 Junction Temperature Maximum Junction Temperature Internal Power Dissipation( T=100 ) Tj -40 ~ +125 Tj Max 150 PD 810 EDS Classification mW B Electrical Characteristics TA=25 unless otherwise noted (VIN=VOUT (T) +2V, VEN=VIN, CIN=1 F, COUT=4.7 F) Parameter Output Voltage Output Current Current Limit Short Circuit Current Load Regulation Dropout Voltage Symbol VOUT (E) (Note1) Condition Min TYP Max Unit IO=1mA, VIN=VOUT(T)+2V -1.5 VOUT(T) 1.5 % VO>1.2V 750 - - mA IO ILIM ISC VO>1.2V 750 - - mA VIN=VOUT(T)+1V, VO < 0.4V - 750 - mA REGLOAD VIN=VOUT(T)+2V, IO=1mA to 750mA % VDROPOUT IO=750mA VO=VOUT(E)-2% -1 0.2 1 VOUT(T)=1.5V - - 1000 VOUT(T)=1.8V - - 650 VOUT(T) 2.0V Quiescent Current Ground Pin Current IQ VIN=VOUT(T)+2V, IO=0mA IGND VIN=VOUT(T)+2V, IO=1mA to 750mA VOUT(T)<2.0V Line Regulation Input Voltage Over Temperature Shutdown Over Temperature Hysterisis Output Voltage Temperature Coefficient Power Supply Rejection Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current Output Under Voltage Output Over Voltage PG Leakage Current PG Voltage Low (Note2) REGLINE IO=1mA VIN=VOUT(T)+1 to 2.0V VOUT(T)<4.0V VOUT(T)+2 4.0V VOUT(T) - - 500 - 45 70 A A - 45 - -0.15 - 0.15 -0.1 0.02 0.1 -0.4 - 0.4 VIN OTS OTH Note3 - 7 - 150 - - 30 - TC - 30 - f=1kHz - 75 - f=10kHz - 55 - f=100kHz PSRR eN VEH VEL IEH IEL ISD VUV VOV ILC VOL Io=100mA Co=4.7 F (ceramic) mV % V ppm/ dB - 30 - f=10Hz~100kHz, Io=10mA, Co=4.7 F - 30 - Vrms VIN=2.7V to 7V 2.0 - VIN V VIN=2.7V to 7V 0 - 0.4 V VEN=VIN, VIN=2.7V to 7V - - 1 A VEN= 0V, VIN=2.7V to 7V - - 1 A VIN=5V, VO=0V, VEN<VEL - 0.5 2 PG goes Low when VOUT too Low - - 84 % VOUT(T) PG goes Low when VOUT too High 105 - - % VOUT(T) A VPG=7V - - 1.0 A ISINK=0.25mA - - 0.4 V Note 1: V OUT (E) =Effective Output Voltage (i.e. the output voltage when “VOUT (T) + 2.0V” is provided at the VIN pin while maintaining a certain IOUT value). 2: VOUT (T) =Specified Output Voltage 3: VIN (MIN) =VOUT+VDROPOUT GSC2127 Page: 2/6 ISSUED DATE :2006/02/24 REVISED DATE : Ordering Information ( contd. ) Part Number GSC2127-15 GSC2127-25 Marking 7B152 XXXX 7B252 XXXX Output Voltage Part Number 1.5V GSC2127-18 2.5V GSC2127-33 Marking 7B182 XXXX 7B332 XXXX Output Voltage 1.8V 3.3V Detailed Description The GSC2127 series of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. 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 140 , or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 . The GSC2127 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75ohms. External Capacitors The GSC2127 is stable with an output capacitance to ground of 4.7 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 When EN pin is pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 2 A. This pin behaves much like an electronic switch. 100K resistor is necessary between VEN source and EN pin when VEN is high than VIN. (Note: There is no internal pull-up for EN pin. It can not be floating.) Power Good The GSC2127 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.) GSC2127 Page: 3/6 ISSUED DATE :2006/02/24 REVISED DATE : Characteristics Curve GSC2127 Page: 4/6 ISSUED DATE :2006/02/24 REVISED DATE : GSC2127 Page: 5/6 ISSUED DATE :2006/02/24 REVISED DATE : 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 GSC2127 Page: 6/6