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ADP1147AN-33 Scheda tecnica(PDF) 1 Page - Analog Devices |
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ADP1147AN-33 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 12 page REV. 0 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 ADP1147-3.3/ADP1147-5 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., 1998 High Efficiency Step-Down Switching Regulator Controllers FUNCTIONAL BLOCK DIAGRAM Q R S VIN SENSE(–) VTH2 SLEEP VOS 1.25V OFF-TIME CONTROL 5pF 100k 13k VIN P-DRIVE GROUND SENSE(+) SENSE(–) CT ITH SHUTDOWN ADP1147 10mV to 150mV R S Q 1 2 C V G S T B VTH1 REFERENCE FEATURES Greater Than 95% Efficiency Current Mode Switching Architecture Provides Superior Load and Line Transient Response Wide Input Voltage Range 3.5 V* to 16 V User Defined Current Limit Short Circuit Protection Shutdown Pin Low Dropout Voltage Low Standby Current 160 A typ Low Cost Available in 8-Lead PDIP or 8-Lead SOIC APPLICATIONS Portable Computers Modems Cellular Telephones Portable Equipment GPS Systems Handheld Instruments GENERAL DESCRIPTION The ADP1147 is part of a family of High Efficiency Step-Down Switching Regulators. These regulators offer superior load and line transient response, a user defined current limit and an automatic power savings mode. The automatic power savings mode is used to maintain efficiency at lower output currents. The ADP1147 incorporates a constant off-time, current mode switching architecture to drive an external P-channel MOSFET at frequencies up to 250 kHz. Constant off-time switching gen- erates a constant ripple current in the external inductor. This results in a wider input voltage operating range of 3.5 V* to 16 V, and a less complex circuit design. *3.5 volt operation is for the ADP1147-3.3. 1000pF SHUTDOWN L * 50 H D1 30BQ040 1 F 0V = NORMAL 1.5V = SHUTDOWN RSENSE** 0.05 RC 1k CC 3300pF CT 470pF VIN (5.2V TO 12V) CIN 100 F VOUT 5V/2A COUT 390 F P-CHANNEL IRF7204 SHUTDOWN GND P-DRIVE SENSE(–) ADP1147 ITH CT VIN SENSE(+) + + + *COILTRONICS CTX 50–2MP **KRL SL-1-C1-0R050J Figure 1. High Efficiency Step-Down Converter (Typical Application) A very low dropout voltage with excellent output regulation can be obtained by minimizing the dc resistance of the Inductor, the RSENSE resistor, and the RDS(ON) of the P-MOSFET. The power savings mode conserves power by reducing switching losses at lower output currents. When the output load current falls below the minimum required for the continuous mode the ADP1147 will automatically switch to the power savings mode. It will remain in this mode until the inductor requires additional current or the sleep mode is entered. In sleep mode with no load the standby power consumption of the device is reduced to 2.0 mW typical at VIN = 10 V. For designs requiring even greater efficiencies refer to the ADP1148 data sheet. LOAD CURRENT – mA 100 95 60 1 10k 10 100 1k 90 85 65 80 75 70 VIN = 6 VOLTS VIN = 10 VOLTS Figure 2. ADP1147-5 Typical Efficiency, Figure 1 Circuit |
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