器件名称: ADP1147AN-5
功能描述: High Efficiency Step-Down Switching Regulator Controllers
文件大小: 195.81KB 共12页
简 介:a
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
High Efficiency Step-Down Switching Regulator Controllers ADP1147-3.3/ADP1147-5
FUNCTIONAL BLOCK DIAGRAM
VIN P-DRIVE GROUND SENSE(+) SENSE(–)
ADP1147
2 R Q S SLEEP 1 Q R S S VTH2 VTH1 T OFF-TIME CONTROL
VIN
V
B
C 10mV to 150mV VOS 13k G 1.25V
5pF
100k
REFERENCE
SENSE(–)
CT
ITH
SHUTDOWN
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 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.
P-CHANNEL IRF7204 L* 50H D1 30BQ040 VIN P-……
