ADP5020

Data Sheet 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 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. Power Management Unit for Imaging Modules ADP5020 TYPICAL APPLICATIONS CIRCUIT VIN 2.4V TO 5.5V VDD1 SW1 10µF 2.2µH 1µF VDD_IO 1.7V TO 3.6V 10kΩ 10kΩ 0.1µF VDD2 VOUT1 VOUT1 VDD3 PGND1 ADP5020 VDDA SW2 VOUT2 VDD_IO PGND2 SDA SCL XSHTDN EN/GPIO VOUT3 SYNC VOUT1 2.5V TO 3.7V 10µF VOUT2 2.2µH 1.1V TO 1.8V 4.7µF VOUT3 1.8V TO 3.3V 1µF EXT. ...