ISSUED DATE :2006/04/10 REVISED DATE : GSC2146 6 0 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 GSC2146 series of positive, linear regulators feature low quiescent current (30 A typ.) with low dropout voltage, making them ideal for battery applications. The space-saving SOP-8 package is attractive for “Pocket” and “Hand Held” applications. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the “Worst” of operating conditions. In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and ground. The GSC2146 is stable with an output capacitance of 2.2 F or greater. Features Very Low Dropout Voltage Guaranteed 600mA output Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Factory Pre-set Output Voltage Highly Accurate± 1.5% Noise Reduction Bypass Capacitor L Temperature Coefficient Block Diagram Applications Battery Powered Widgets Instrumentation Wireless Devices Cordless Phones PC Peripherals Portable Electronics Electronic Scales 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 1/5 ISSUED DATE :2006/04/10 REVISED DATE : Absolute Maximum Ratings Parameter Symbol Ratings Unit Input Max Voltage VIN 8 V Output Current IOUT PD/( VIN- VO) A Output Voltage VOUT 1.5~3.8 V Operating Ambient Temperature Topr -40 ~ +85 Junction Temperature Maximum Junction Temperature Thermal Resistance Power Dissipation( T=100 ) Tj -40 ~ +125 Tj Max 150 ja 123.7 PD 810 EDS Classification B Electrical Characteristics Ta=25 Parameter Output Voltage Output Current Current Limit Load Regulation Dropout Voltage unless otherwise noted Symbol VOUT (E) Condition Min VIN=VOUT(T)+2V, IO=1mA -1.5% IO VIN=VOUT(T)+2V, VO>1.2V 600 ILIM REGLOAD VIN=VOUT(T)+2V, VO>1.2V (Note1) VDROPOUT VIN=VOUT(T)+2V, IO=1mA to 600mA Quiescent Current Input Voltage Over Temperature Shutdown Over Temperature Hysterisis IQ REGLINE Max Unit 1.5% V - - mA 600 800 - mA % VOUT(T) (Note2) - 0.2 1 1.4V - - 1900 IO=600mA 1.4V<VOUT(T) VO=VOUT(E)-2% 2.0V<VOUT(T) 2.0V - - 1400 2.8V - - 800 - - 600 - 30 50 1.4V -0.2 - 0.2 VIN=VOUT(T)+1 to 1.4V<VOUT(T) 2.0V VOUT(T)+2 2.0V<VOUT(T) -0.15 - 0.15 -0.1 0.02 0.1 VIN= VOUT(T)+1V, IO=0mA 1.3V VOUT(T) IO=1mA VIN OTS OTH Note3 - 7 - 150 - - 30 - TC - 30 - - 300 600 Output Voltage Temperature Coefficient Short Circuit Current(Note4) Power Supply Rejection TYP 1.3V VOUT(T) 2.8V<VOUT(T) Line Regulation /W mW ISC PSRR Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current eN VEH VEL IEH IEL ISD VIN=VOUT(T)+1V, VOUT<0.8V Io=100mA Co=2.2 F ceramic CBYP=0.01 F mV A % V ppm/ mA f=1kHz - 75 - f=10kHz - 55 - - 30 - - 30 - Vrms 2.0 - VIN V f=100kHz f=10Hz~100kHz Io=10mA, Co=2.2 F CBYP=0.01 F VIN=2.7V to 7V dB VIN=2.7V to 7V 0 - 0.4 V VEN=VIN, VIN=2.7V to 7V - - 0.1 A VEN= 0V, VIN=2.7V to 7V - - 0.5 A VIN=5V, VO=0V, VEN<VEL - 0.5 0.1 A Note 1: VOUT (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: V IN (MIN) =VOUT+V DROPOUT 4: To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must be applied before a current source load is applied. 2/5 ISSUED DATE :2006/04/10 REVISED DATE : Ordering Information ( contd. ) Part Number GSC2146-15 GSC2146-25 GSC2146-28 GSC2146-29 GSC2146-31 GSC2146-34 GSC2146-36 GSC2146-38 Marking 6D152 XXXX 6D252 XXXX 6D282 XXXX 6D292 XXXX 6D312 XXXX 6D342 XXXX 6D362 XXXX 6D382 XXXX Output Voltage Part Number 1.5V GSC2146-18 2.5V GSC2146-27 2.8V GSC2146-2H 2.9V GSC2146-30 3.1V GSC2146-33 3.4V 3.6V GSC2146-35 GSC2146-37 Marking 6D182 XXXX 6D272 XXXX 6D2H2 XXXX 6D302 XXXX 6D332 XXXX 6D352 XXXX 6D372 XXXX Output Voltage 1.8V 2.7V 2.85V 3.0V 3.3V 3.5V 3.7V 3.8V Detailed Description The GSC2146 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 150 , or the current exceeds 600mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 . The GSC2146 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GSC2146 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 GSC2146 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. A third capacitor can be connected between the BY-PASS pin and GND. This capacitor can be a low cost Polyester Film variety between the value of 0.001~0.01 F. A large capacitor improves the AC ripple rejection, but also makes the output come up slowly. This “Soft” turn-on is desirable in some applications to limit turn-on surges. 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. 3/5 ISSUED DATE :2006/04/10 REVISED DATE : Characteristics Curve 4/5 ISSUED DATE :2006/04/10 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 5/5