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| www..com ISSUED DATE :2006/05/16 REVISED DATE : GJ2137 Description 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 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 & Low Dropout Voltage Very Functional Block Diagram &Guaranteed 750mA output &Over-Temperature Shutdown &Current Limiting &Short Circuit Current Fold-back &Highly Accurate 1.5% &Low Temperature Coefficient 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 Input Max Voltage Output Current Output Voltage Operating Ambient Temperature Junction Temperature Maximum Junction Temperature Thermal Resistance Internal Power Dissipation ( T=100 : ) EDS Classification Symbol VIN IOUT VOUT Topr Tj Tj Max jc PD Ratings 8 1 1.5~3.8 -40 ~ +85 -40 ~ +125 150 60 3 B Unit V A V : : : : /W W Electrical Characteristics VIN=VOUT(T)+2V, Ta=25 : unless otherwise noted Parameter Output Voltage Output Current Current Limit Load Regulation Dropout Voltage Quiescent Current Ground Pin Current Line Regulation Input Voltage Over Temperature Shutdown Over Temperature Hysterisis Vo Temperature Coefficient Symbol VOUT(E) (Note1) Condition IO=1mA VO>1.2V VO>1.2V VIN=VOUT(T)+2V, IO=1mA to 750mA IO=750mA VO=VOUT(E)-2% 1.4V -1.5% 750 750 -1 -0.15 -0.1 Note3 - TYP VOUT(T) (Note2) Max 1.5% 1 1400 800 600 50 0.15 0.1 7 600 - Unit V mA mA % mV A A % V : : ppm/ : mA dB Vrms IO ILIM REGLOAD VDROPOUT IQ IGND REGLINE VIN OTS OTH TC ISC PSRR eN 850 0.2 30 35 0.02 150 30 30 300 50 20 10 30 VIN= VOUT(T)+2V, IO=0mA VIN= VOUT(T)+2V, IO=1mA~750mA IO=1mA 1.4V VIN=VOUT(T)+1V, VOUT<0.8V f=1kHz Io=100mA f=10kHz Co=2.2 F f=100kHz f=10Hz~100kHz, Io=10mA, Co=2.2 F - 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) =VOUT+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 XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX Marking 7T152 7T252 7T282 7T302 7T332 7T352 Output Voltage 1.5V 2.5V 2.8V 3.0V 3.3V 3.5V 3.7V 2.85V Part Number GJ2137-18 GJ2137-27 GJ2137-29 GJ2137-31 GJ2137-34 GJ2137-36 GJ2137-38 XXXX XXXX XXXX XXXX XXXX XXXX XXXX Marking 7T182 7T272 7T292 7T312 7T342 7T362 7T382 Output Voltage 1.8V 2.7V 2.9V 3.1V 3.4V 3.6V 3.8V 7T372 7T2H2 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. Detailed Description 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. External Capacitors 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 |
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