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ADP1148AR-5 Datasheet(PDF) 1 Page - Analog Devices |
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ADP1148AR-5 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADP1148, ADP1148-3.3, ADP1148-5 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1997 High Efficiency Synchronous Step-Down Switching Regulators FUNCTIONAL BLOCK DIAGRAM Q R S VTH1 VIN SENSE(–) VTH2 1.25V OFF-TIME CONTROL 100k 13k B VIN P-DRIVE SENSE(+) SENSE(–) G 4 6 CT ITH SHUTDOWN 8 1 3 ADP1148 10mV to 150mV C VFB INT VCC REFERENCE 5 10 T N-DRIVE PWR GND 14 12 ADJUSTABLE VERSION VFB 9 7 S 1 Q R S 2 V SLEEP SIGNAL GND 11 NON-OVERLAP DRIVE FEATURES Operation From 3.5 V to 18 V Input Voltage Ultrahigh Efficiency > 95% Low Shutdown Current Current Mode Operation for Excellent Line and Load Transient Response High Efficiency Maintained Over Wide Current Range Logic Controlled Micropower Shutdown Short Circuit Protection Very Low Dropout Operation Synchronous FET Switching for High Efficiency Adaptive Nonoverlap Gate Drives APPLICATIONS Notebook and Palmtop Computers Portable Instruments Battery Operated Digital Devices Industrial Power Distribution Avionics Systems Telecom Power Supplies GPS Systems Cellular Telephones GENERAL DESCRIPTION The ADP1148 is part of a family of synchronous step-down switching regulator controllers featuring automatic sleep mode to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250 kHz using a constant off-time current-mode architecture. VIN INT VCC ITH CT S-GND P-DRIVE SENSE(+) SENSE(–) SHUTDOWN N-DRIVE P-GND ADP1148 + + P-CH IRF7204 N-CH IRF7403 1000pF CT 470pF RC 1k CC 3300pF C1 10BQ040 L* 62 H RSENSE** 0.05 +COUT 390 F CIN 100 F VIN (5.2V TO 18V) 1 F 10nF 0V = NORMAL >1.5V = SHUTDOWN *COILTRONICS CTX-68-4 **KRL SL-1-C1-0R050L VOUT 5V/2A Figure 1. High Efficiency Step-Down Converter Figure 2. ADP1148-5 Typical Efficiency The constant off-time architecture maintains constant ripple current in the inductor, easing the design of wide input range converters. Current-mode operation provides excellent line and load transient response. The operating current level is user programmable via an external current sense resistor. The ADP1148 incorporates automatic Power Saving Sleep Mode operation when load currents drop below the level re- quired for continuous operation. In sleep mode, standby power is reduced to only about 2 mW at VIN = 10 V. In shutdown, both MOSFETs are turned off. TYPICAL APPLICATIONS LOAD CURRENT – A 100 85 70 0.02 2 95 90 80 75 0.2 VIN = 6V VIN = 10V FIGURE 1 CIRCUIT |
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