AS3607 Power Management IC

3 Buck DCDCs, 5 LDOs, 1A Linear Charger, General Purpose ADC, Programmable Startup

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

AS3607 Block Diagram

AS3607 Block Diagram

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Supported Processors

Reference designs from processor vendors and partners of austriamicroysystems are available for many processor types.

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Where to Buy?

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