GENERAL DESCRIPTION

The ADP5020 provides a highly integrated power solution that includes all of the power circuits necessary for a digital imaging module. It comprises two step-down dc-to-dc converters, one LDO, and a power sequence controller. All dc-to-dc converters integrate power pMOSFETs and nMOSFETs, making the system simpler and more compact and reducing the cost. The ADP5020 has digitally programmed output voltages and buck converters that can source up to 600 mA. A fixed frequency operation of 3 MHz enables the use of tiny inductors and capacitors. The buck converters use a voltage mode, constant-frequency PWM control scheme, and the synchronous rectification is implemented to reduce the power loss. The Buck 1 regulator operates at up to 93 efficiency.

FEATURES

Input voltage range: 2.4 V to 5.5 V

Low standby current: 1 μA

Switching frequency: 3 MHz

I2C interface

Synchronous Buck 1 regulator: 600 mA

Synchronous Buck 2 regulator: 250 mA

Low dropout regulator (LDO): 150 mA

Internal compensation

Internal soft start

Thermal shutdown

20-lead 4 mm × 4 mm LFCSP

APPLICATIONS

Digital cameras, handsets

Mobile TVs