Key Features

The AS3604 features all the functions of the AS3603 with the following additions (marked with boldface italcs):

• 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 (0.75 to 2.5V, 200mA; 250mA up to 1.4V)
  • − Three RF Low-Noise LDOs (1.85 to 3.4V, 200mA)
  • − Two RF Low-Noise LDOs (1.85 to 3.4V, 150mA)
  • − One SIM Low-Power LDO (3.0V, 20mA)
  • − One Periphery Low-Noise LDO (2.5 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
    -Stereo
  • − 1W @ 8
    -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 3.0 to 5.5V
• Four General Purpose Switches (1Ohm and 2 Ohm)
• 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)