G5U2178 ETL | Alldatasheet

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Technical content

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Description

The G5U2178 series of positive, linear regulators feature low quiescent current (45A typ.) with low dropout voltage, making them 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. In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and Ground. The G5U2178 is stable with an output capacitance of 4.7F or greater. Features Functional Block Diagram & Very Low Dropout Voltage & Guaranteed 1.5A output & Over-Temperature Shutdown & Current Limiting & Short Circuit Current Fold-back & Highly Accurate± 1.5% & Low‡Temperature Coefficient & Noise Reduction Bypass Capacitor & Power-Saving Shutdown Mode

Applications

& Battery Powered Widgets & Instrumentation & Wireless Devices & PC Peripherals & Portable Electronics Package Dimensions A 4.40 4.80 c2 1.25 1.45 b 0.66 0.91 L2 1.27 REF. L4 0.00 0.30 B D 8.6 9.0 c 0.36 0.5 e 1.70 REF. L1 2.29 2.79 L 14.6 15.8 E 9.80 10.4 0˚ 8˚ Typical Application Circuit

ISSUED DATE :2005/06/21 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 1.5~5.0 V Operating Ambient Temperature Topr -40 ~ +85 : Junction Temperature Tj -40 ~ +125 Maximum Junction Temperature Tj Max 150 Thermal Resistance jc 5 :/W Internal Power Dissipation(æT=100:) PD 3000 mW EDS Classification B Electrical Characteristics VIN=VOUT(T)+2V, VEN=VIN, TA=25: unless otherwise Parameter Symbol Condition Min TYP Max Unit Output Voltage VOUT(E) (Note1) VEN=VEHmin, IO=1mA -1.5% VOUT(T) (Note2) 1.5% V Output Current IO VOUT>1.2V 1.5 - - A Current Limit ILIM VOUT>1.2V 1.5 2.0 - A Load Regulation REGLOAD IO=1mA to 1.5A -1 0.2 1 % 1.5V<VOUT(T) 2.0V - - 1300 2.0V<VOUT(T) 2.8V - - 800 Dropout Voltage VDROPOUT IO=1.5A VO=VOUT(E)-2% 2.8V<VOUT(T) - - 600 mV Quiescent Current IQ IO=0mA - 45 70 A Ground Pin Current IGND IO=1mA~1.5A - 45 - A IO=1mA VIN=VOUT(T)+1 to VOUT(T)+2 4.0V VOUT(T) -0.4 - 0.4 Input Voltage VIN Note3 - 7 V Over Temperature Shutdown OTS - 150 - : Over Temperature Hysterisis OTH - 30 - : Output Voltage Temperature Coefficient TC - 30 - ppm/: Short Circuit Current ISC VOUT<0.4V - 750 - mA f=1kHz - 50 - Power Supply Rejection PSRR Io=100mA Co=4.7F ceramic f=10kHz - 20 - dB f=1kHz - 75 - Power Supply Rejection PSRR Io=100mA Co=4.7F ceramic CBYP=0.01F f=10kHz - 55 - dB Output Voltage Noise eN f=10Hz~100kHz Io=10mA, CBYP=0F Co=4.7F - 30 - Vrms Output Voltage Noise eN f=10Hz~100kHz Io=10mA, CBYP=0.01F Co=4.7F - 30 - Vrms VEH 2.0 - VIN V EN Input Threshold VEL 0 - 0.4 V IEH VIN=7V - - 0.1 A EN Input Bias Current IEL VEN= 0V, VIN=7V - - 0.5 A Shutdown Supply Current ISD VIN=5V, VOUT=0V, VEN=0V - 0.5 2 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: VIN (MIN) =VOUT+VDROPOUT

ISSUED DATE :2005/06/21 REVISED DATE : Ordering Information ( contd. ) Part Number Marking Output Voltage Part Number Marking Output Voltage 5U2178-15 8152 XXXX 1.5V 5U2178-18 8182 XXXX 1.8V 5U2178-25 8252 XXXX 2.5V 5U2178-33 8332 XXXX 3.3V 5U2178-47 8472 XXXX 4.75V 5U2178-50 8502 XXXX 5.0V Characteristics Curve

ISSUED DATE :2005/06/21 REVISED DATE : 115: 85: 55: 25: -5: -45:

ISSUED DATE :2005/06/21 REVISED DATE :

ISSUED DATE :2005/06/21 REVISED DATE : Detailed Description The G5U2178 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 G5U2178 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3, the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75. External Capacitors The G5U2178 is stable with an output capacitance to ground of 4.7F 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 0.1F ceramic capacitor with a 10F 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 0.1F 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 0.001~0.01F. 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 When pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1A. This pin behaves much like an electronic switch. 100k resistor is necessary between VEN source and EN pin when VEN is higher than VIN. (Note: there is no internal pull-up for EN PIN) 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: 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