AS3604 Power Management IC

Description

The AS3604 is based on the architecture of the AS3603. It has additional functions like momentary power loss detection, a synchronous DCDC buck converter, charger resume operation and increased driving capability of the LDOs.

Key Features

The AS3604 features all the functions of the AS3603 with the following additions:

• Momentary Power Loss Detection
  • Detect a short interruption (<200ms) of the battery supply (e.g. due to a dropped phone)
• Ten Programmable High Performance LDOs
  • Two Digital Low-Power LDOs (0.75V to 2.5V, 200mA; 250mA up to 1.4V)
  • Three RF Low-Noise LDOs (1.85V to 3.4V, 200mA)
  • Two RF Low-Noise LDOs (1.85V to 3.4V, 150mA)
  • One SIM Low-Power LDO (3.0V, 20mA)
  • One Periphery Low-Noise LDO (2.5V to 3.2V, 200mA)
  • One Low-Power LDO (2.5V, 10mA)

• Programmable High Efficiency DC/DC Converters
  • Step-down: 0.8V-3.4V, up to 500mA with 2.2MHz operating frequency and small external coil (2.2uH)
  • Step Up: 15V, 45mA, (for White LEDs)
• Stereo Audio Power Amplifier
  • 0.5W @ 4 [0001] -Stereo
  • 1W @ 8 [0001] -Bridged
  • Digital Volume Control, 3dB Steps
  • Click- and Pop-Less Start-Up and Power- Down
• Complete Chemistry-Independent Battery Charger
  • Integrated Fuel Gauge
  • Automatic Trickle Charging
  • Programmable Constant Current Charging
  • Programmable Constant Voltage Charging
  • Programmable Pulse Charging
  • Safety Functions (Low Battery Shutdown)
  • Operation without Battery
  • No-Battery Detection
  • Can regulate the current through the battery or from the charger
  • Charger Input Overvoltage protection (6V)
  • Shutdown even with connected charger
  • Charger Resume operation
  • Charger Interrupts (Inserted, Removed, Overvoltage, Resume)
• Four 8-Bit Programmable Current Sources (0.625mA to 160mA) support:
  • Buzzer
  • Vibrator
  • LEDs
• Wide Battery Supply Range 3.0V to 5.5V
• Four General Purpose Switches (1Ω and 2Ω)
• Three Programmable General Purpose I/O Pins
• On-Chip Bandgap Tuning for High Accuracy (±1%)
• Integrated Programmable Watchdog (7.5 to 1900ms)
• Programmable Reset (10 to 110ms)
• Shutdown Current typ 7μA (2.5V Always On)
• Overcurrent and Thermal Protection
• 0.35μ CMOS Solution
• 48-Pin, 6x6mm QFN Package (0.4mm pitch)
• 2.1 Watt Power Dissipation @ TAMBIENT = 70ºC
• Almost Pin Compatible to AS3603 (only one pin changed)

Applications

The AS3604 provides multi-standard power management for mobile phones, PDAs, and 1-cell Li+ or 3 to 4-cell Ni-MH powered devices.

Block diagram for AS3604 Power Management IC