ISSUED DATE :2006/05/16 REVISED DATE : GJ2137 7 5 0 m A C M O S L o w D r o p o u t Vo l t a g e R e g u l a t o r Description The GJ2137 series of positive, linear regulators feature low quiescent current (30 A typ.) with low dropout voltage, making them ideal for battery applications. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the “Worst” of operating conditions. The GJ2137 is stable with an output capacitance of 2.2 F or greater. Features Very Low Dropout Voltage Guaranteed 750mA output Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Highly Accurate± 1.5% Low Temperature Coefficient Functional Block Diagram Applications Battery Powered Widgets Instrumentation Wireless Devices PC Peripherals Portable Electronics Package Dimensions TO-252 REF. A B C D E F S Millimeter Min. Max. 6.40 6.80 5.20 5.50 6.80 7.20 2.40 3.00 2.30 REF. 0.70 0.90 0.60 0.90 REF. G H J K L M R Millimeter Min. Max. 0.50 0.70 2.20 2.40 0.45 0.55 0 0.15 0.90 1.50 5.40 5.80 0.80 1.20 Typical Application Circuit GJ2137 Page: 1/5 ISSUED DATE :2006/05/16 REVISED DATE : Absolute Maximum Ratings Parameter Symbol Ratings Unit Input Max Voltage VIN 8 V Output Current IOUT 1 A Output Voltage VOUT 1.5~3.8 V Operating Ambient Temperature Topr -40 ~ +85 Junction Temperature Maximum Junction Temperature Thermal Resistance Internal Power Dissipation ( T=100 ) Tj -40 ~ +125 Tj Max 150 jc 60 PD 3 EDS Classification B Electrical Characteristics VIN=VOUT(T)+2V, Ta=25 Parameter Output Voltage /W W unless otherwise noted Symbol VOUT (E) Condition Min IO=1mA -1.5% (Note1) TYP VOUT(T) (Note2) Max Unit 1.5% V Output Current Current Limit Load Regulation IO ILIM VO>1.2V 750 - - mA VO>1.2V 750 850 - mA REGLOAD VIN=VOUT(T)+2V, IO=1mA to 750mA -1 0.2 1 % 1.4V<VOUT(T) 2.0V - - 1400 Dropout Voltage VDROPOUT 2.0V<VOUT(T) 2.8V - - 800 2.8V<VOUT(T) - - 600 Quiescent Current Ground Pin Current Line Regulation Input Voltage Over Temperature Shutdown Over Temperature Hysterisis Vo Temperature Coefficient Short Circuit Current Power Supply Rejection Output Voltage Noise IQ IGND REGLINE VIN OTS OTH TC ISC PSRR eN IO=750mA VO=VOUT(E)-2% mV VIN= VOUT(T)+2V, IO=0mA - 30 50 A VIN= VOUT(T)+2V, IO=1mA~750mA IO=1mA 1.4V<VOUT(T) 2.0V VIN=VOUT(T)+1 to 2.0V<VOUT(T)<4.0V VOUT(T)+2 - 35 - A -0.15 - 0.15 -0.1 0.02 0.1 Note3 - 7 - 150 - - 30 - - 30 - VIN=VOUT(T)+1V, VOUT<0.8V - 300 600 f=1kHz Io=100mA f=10kHz Co=2.2 F f=100kHz f=10Hz~100kHz, Io=10mA, Co=2.2 F - 50 20 10 30 - % V ppm/ mA dB Vrms 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: VIN (MIN) =V OUT+VDROPOUT GJ2137 Page: 2/5 ISSUED DATE :2006/05/16 REVISED DATE : Ordering Information ( contd. ) Part Number GJ2137-15 GJ2137-25 GJ2137-28 GJ2137-30 GJ2137-33 GJ2137-35 GJ2137-3.7 GJ2137-2H Marking 7T152 XXXX 7T252 XXXX 7T282 XXXX 7T302 XXXX 7T332 XXXX 7T352 XXXX 7T372 XXXX 7T2H2 XXXX Output Voltage Part Number 1.5V GJ2137-18 2.5V GJ2137-27 2.8V GJ2137-29 3.0V GJ2137-31 3.3V GJ2137-34 3.5V GJ2137-36 3.7V GJ2137-38 Marking 7T182 XXXX 7T272 XXXX 7T292 XXXX 7T312 XXXX 7T342 XXXX 7T362 XXXX 7T382 XXXX Output Voltage 1.8V 2.7V 2.9V 3.1V 3.4V 3.6V 3.8V 2.85V Detailed Description The GJ2137 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 750mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 . The GJ2137 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GJ2137 also incorporates current fold-back to reduce power dissipation when the output is short circuited. This feature becomes active when the output drops below 0.8V and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8V. External Capacitors The GJ2137 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. GJ2137 Page: 3/5 ISSUED DATE :2006/05/16 REVISED DATE : Characteristics Curve GJ2137 Page: 4/5 ISSUED DATE :2006/05/16 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 GJ2137 Page: 5/5