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| www..com ISSUED DATE :2004/12/16 REVISED DATE : GQ2123 Description 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 The GQ2123 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. In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and Ground. The GQ2123 is stable with an output capacitance of 2.2 F or greater. Features & Low Dropout Voltage Very Functional Block Diagram Applications & Battery Powered Widgets &Instrumentation &Wireless Devices &PC Peripherals &Portable Electronics &Cordless Phones &Electronic Scales &Guaranteed 300mA output &Over-Temperature Shutdown &Current Limiting &Short Circuit Current Fold-back &Highly Accurate 1.5% &Noise Reduction Bypass Capacitor &Power-saving Shutdown Mode &Factor Pre-set Output Voltage 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 1/7 ISSUED DATE :2004/12/16 REVISED DATE : Absolute Maximum Ratings Parameter Input Max Voltage Output Current Output Voltage Operating Ambient Temperature Junction Temperature Maximum Junction Temperature Power Dissipation( T=100 : ) EDS Classification Symbol VIN IOUT VOUT Topr Tj Tj Max PD Ratings 8 PD/( VIN- VO) 1.5~5.0 -40 ~ +85 -40 ~ +125 150 380 B Unit V mA V : mW Electrical Characteristics Ta=25 Parameter Output Voltage Output Current Current Limit Load Regulation Dropout Voltage Quiescent Current Ground Pin Current Line Regulation Symbol VOUT(E) (Note1) unless otherwise noted Condition VIN=VOUT(T)+2V, IO=1mA VIN=VOUT(T)+2V, IO=300mA Min -1.5% -2.5% 300 300 -1 1.4V TYP VOUT(T) (Note2) Max 1.5% 2.5% 1 1300 400 300 50 0.2 0.15 0.1 0.4 7 300 VIN 0.4 0.1 0.5 1 0.4 Unit V V mA mA % mV A A IO ILIM REGLOAD VDROPOUT IQ IGND REGLINE VIN=VOUT(T)+2V, VOUT VOUT(E)*0.96 VIN=VOUT(T)+2V, VO>1.2V VIN=VOUT(T)+2V, IO=1mA to 300mA 1.2V VOUT(T) 2.0V IO=300mA VO=VOUT(E)-2% 2.0V -0.2 IO=1mA 1.4V Input Voltage Over Temperature Shutdown Over Temperature Hysterisis VIN OTS OTH TC ISC PSRR eN VEH VEL IEH IEL ISD VO,SD V : : ppm/ : mA dB Vrms V V A A A V Output Voltage Temperature Coefficient Short Circuit Current(Note4) Power Supply Rejection Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current Shutdown Output Voltage certain IOUT value). f=10kHz f=10Hz~100kHz Co=2.2 F Io=10mA VIN=2.7V to 7V VIN=2.7V to 7V VEN=VIN, VIN=2.7V to 7V VEN= 0V, VIN=2.7V to 7V VIN=5V, VO=0V, VEN 2/7 ISSUED DATE :2004/12/16 REVISED DATE : Ordering Information ( contd. ) Part Number GQ2123-15 GQ2123-25 GQ2123-28 GQ2123-30 GQ2123-33 GQ2123-35 GQ2123-37 GQ2123-50 XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX Marking 3B152 3B252 3B282 Output Voltage 1.5V 2.5V 2.8V 3.0V 3.3V 3.5V 3.7V 5.0V Part Number GQ2123-18 GQ2123-27 GQ2123-29 GQ2123-31 GQ2123-34 GQ2123-36 GQ2123-38 GQ2123-2H XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX Marking 3B182 Output Voltage 1.8V 2.7V 2.9V 3.1V 3.4V 3.6V 3.8V 2.85V 3B272 3B292 3B312 3B342 3B362 3B382 3B2H2 3B302 3B332 3B352 3B372 3B502 Characteristics Curve 3/7 ISSUED DATE :2004/12/16 REVISED DATE : 4/7 ISSUED DATE :2004/12/16 REVISED DATE : 5/7 ISSUED DATE :2004/12/16 REVISED DATE : 6/7 ISSUED DATE :2004/12/16 REVISED DATE : The GQ2123 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 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 : . The GQ2123 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GQ2123 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. The GQ2123 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. 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. Detailed Description External Capacitors Enable 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 7/7 |
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