Analog Devices ADP1147
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.| Part No. | ADP1147 |
|---|---|
| Datasheet | ADP1147 Download |
| Manufacturer |  Analog Devices |
| Description | Step-Down Switching Regulator Controllers |
| Buy | Stock & Price |
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 InstrumentsGENERAL DESCRIPTION
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 generates 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. VIN (5.2V TO 12V) + 1●F + CIN 100●F P-CHANNEL IRF7204 L* 50●H D1 30BQ040 RSENSE** 0.05⍀ VOUT 5V/2A + COUT 390●F 0V = NORMAL 1.5V = SHUTDOWN VIN P-DRIVE CC RC 3300pF 1k⍀ ADP1147 SHUTDOWN ITH SENSE(+) CT SENSE(–) CT GND 470pF 1000pF *COILTRONICS CTX 50–2MP **KRL SL-1-C1-0R050J SHUTDOWN Figure 1.
