AS3654 Power Management IC

Description

The AS3654 is a highly integrated solution for power supply generation and monitoring, battery management including charging. It is controlled via a serial control interface and integrates all necessary system specific functions such as clock, reset and interrupt generation, voltage and temperature monitoring.

Key Features

System Control

• Serial Control Interface
• On/Off Control Module
• Reset Generation for system controller
• Programmable Interrupt Controller
• Watchdog
• Low power off mode (9μA; 2.5V LDO on)

Supply Voltage Generation

• 1 RF Programmable Low Noise LDOs (400mA)
• 1 RF Programmable Low Noise LDOs (150mA) 2 RF Programmable Low Noise LDOs (150mA)
• 2 Programmable Digital Low Power LDOs (200mA)
• 2 General Purpose PWM DC/DC step up converter with two programmable current sinks (e.g. for white led)
• 3 General Purpose high efficiency DC/DC step down converter
• 1 Low noise charge pump with 5V output voltage
• 1 Ultra Low Power 2.5V LDO (always on)

Current Sinks

• 4 programmable(6-bit) from 0.625 to 40mA optional useable as GPIOs
• 3 programmable high voltage (15V) (6-bit) from 0.625 to 40mA
• Internal PWM generator

10-bit Successive Approximation ADC

• 40μs conversation time

Battery Management

• Full featured chemistry independent step down charger with included Gas Gauge and Current limitation
• 0.2 W Battery switch for start-up during trickle charging
• Integrated USB charger up to 400mA

Power Management Features

• Wide Battery Supply Range 3.0…5.5V
• On-Chip Bandgap Tuning for High Accuracy (±1%)
• Current protection
• Thermal Protection with internal temperature sensor

Audio

• 18-Bit Audio DAC
• Two Digital Audio Inputs (I²S interface)
• 2.9V low Noise LDO for Audio DAC
• Headphone Amplifier Output with GND separation
• GND Buffer for Headphone Amplifier
• Line/ Headphone output with GND separation

Programmable System Clock

• 1.6 MHz to 2.3 MHz with 100 kHz steps

Package

• BGA100 9x9mm, 0.8mm pitch

Applications

• Power Management Unit
• 1 Cell Li+ or 3 Cell NiMH powered devices
• Car battery powered systems with and without internal battery

Block Diagram