AS3607 Power Management IC

Description

The fully programmable power management unit AS3607 includes: three DC-DC step-down converters and five low-noise LDOs suitable for RF applications, an LED backlight driver, two programmable current sinks and a powerful Li-Ion battery charger. The three step-down converters deliver 700 mA each with an efficiency of up to 95%, extending battery life significantly. The fixed 2 MHz switching frequency minimizes PCB footprint by allowing the use of tiny, low-profile inductors

Key Features

Voltage Generation

• 3 DCDC step down regulators
• - DVM (0.61V-3.3V, 700mA)
• - 50uA quiescent current
• - selectable switching frequency (2 or 1MHz)
• - 1.4A with combined DCDC 2 & 3
• 1 LDO low noise 2.7V (2.3-3.5V), 100mA
• 3 or 4 LDOs low noise
• - 1.2-3.5V; 150/250mA
• - 30uA quiescent current (low power mode)
• power supply supervision (LDO1)
• 5sec and 10sec emergency shut-down
• hibernation function

HV Backlight Driver

• step up for 26V backlight with internal transistor
• voltage control mode and over-voltage protection
• 2 programmable current sink (max. 38mA)
• max. 20mA@50V (with ext. transistor)
• possible external PWM dimming input

Battery Charger

• prog. trickle charging (25-220mA)
• prog. constant current charging (100-1000mA)
• prog. constant voltage charging (3.9V-4.25V)
• charger time-out and temperature supervision
• selectable current limitation for USB mode
• integrated battery switch & ideal diode
• external battery switch control output

Battery and Temperature

Supervisor2 or 4 General Purpose IOs

• 10bit general purpose ADC input
• PWM dimming input or wake-up input
• status output for: charger, low battery, power good and power-up key

OTP programmable BOOT Sequence

• programmable regulator default voltages
• programmable start-up sequence
• applicable for LDO 2-5 and DCDC 1-3

Control Interface

• I2C control lines, including watchdog
• Power-Up input
• Interrupt output
• bidirectional reset, with selectable delay
• ultra low power standby mode, 110uA with LDO5 on

Power-On Reset CircuitPackaging

• QFN36 6x6mm, 0.5mm pitch

Applications

PDA, PMP, GPS-Navigation System, e-Dictionaries

1 Cell Li+ or 3 Cell NiMH powered devices

Block diagram for AS3607 Power Management IC