Hitachi 55293DLB, Service Manual

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APL5910
General Description
The APL5910 is a 1A ultra low dropout linear regulator. The IC needs two supply voltages, one is a control
voltage (VCNTL) for the control circuitry, the other is a main supply voltage (VIN) for power conversion, to
reduce power dissipation and provide extremely low dropout voltage. The APL5910 integrates many functions.
A Power-On- Reset (POR) circuit monitors both supply voltages on VCNTL and VIN pins to prevent erroneous
operations. The functions of thermal shutdown and current-limit protect the device against thermal and current
over-loads. A POK indicates that the output voltage status with a delay time set internally. It can control other
converter for power sequence. The APL5910 can be enabled by other power systems. Pulling and holding the
EN voltage below 0.4V shuts off the output.
The APL5910 is available in a SOP-8P package which features small size as SOP-8 and an Exposed Pad to
reduce the junction-to-case resistance to extend power range of applications.
Features

Ultra Low Dropout
o
0.12V (Typical) at 1AOutput Current

0.8V Reference Voltage

High Output Accuracy
o
±1.5%over Line, Load, and Temperature Range

Fast Transient Response

Adjustable Output Voltage

Power-On-Reset Monitoring on Both VCNTL and VIN Pins

Internal Soft-Start

Current-Limit and ShortCurrent-Limit Protections

Thermal Shutdown with Hysteresis

Open-Drain VOUT Voltage Indicator (POK)

Low Shutdown Quiescent Current (< 30mA )

Shutdown/Enable Control Function

Simple SOP-8P Package with Exposed Pad

Lead Free and Green Devices Available (RoHS Compliant)
Applications

Motherboards, VGA Cards

Notebook PCs

Add-in Cards

Figure: Pin configuration