• DC to DC Step Down 1.2 A, 0.9V (Dynamically Adjustable to 0.87V/1.1V/1.2V)
• DC to DC step Down 1.2 A, 1.2V (Dynamically Adjustable to 1.0V/1.1V/1.3V) or 1.75V
(Dynamically Adjustable 1.65V/1.70V/1.80V)
• DC to DC Step Down 1.2 A, 1.8V (Dynamically Adjustable to 1.70V/1.75V/1.85V) or
2.5V (Dynamically Adjustable 2.3V/2.4V/2.6V)
• DC to DC Step Up/Down 520 mA, 3.3V (Dynamically Adjustable to 3.0V/3.1V/3.4V)
• Dual Battery Chargers: Li+ Precharge, Fast Charge, Top-up Charge, 4.1V (or
Adjustable), Processor Tuned Algorithms
– USB Trickle Charge: Precharge Flat Battery from USB Pre-enumeration, then Autowake of Processor at 3.8V Battery Level
– Battery Charge Select: 25 mA to 500 mA
– Real-time Charge Inhibit: Allows Charge Suspend (e.g. During TX Slots)
Supply Monitor of Four Power Sources: Thermistors, Temperature, DC/DC Rails, all
Supplied with Out-of-regulation Threshold Detection
SIM Interface: SIM / USIM, 1.8V / 3.0V Standards, Integrated TX and RX Data FIFO
SPI Control Interface: Up to 13 MHz; Tuned for SA1110/PXA250/PXA255 1.2 MHz SPI,
128 8-bit Registers
Power on Reset: For SA1110/PXA250/PXA255 Architectures plus Additional
Sequenced System Level Resets
Voltage and Temperature Supervision
Calibrated Voltage Reference
8-bit ADC with 5-input Multiplexer
Integrated Oscillator, Start-up and Self-protection Circuitry
Off Power: 60 µA with External “Button Select” for Restart
Applications Include: PDAs, PCMCIA Cards, SMART Phones, Pocket PCs, 3G
Applications, Intel® XScale™ Powered Applications
Management IC
for Datacom
The AT73C203 device provides an integrated solution to portable and handheld applications built around microprocessors requiring “smart” power management functions,
such as PDAs, Palmtop computers, point-of-sales terminals, 3G modems, etc.
Its compact package outline and small size of external components make the
AT73C203 suitable for PCMCIA card power management as well.
The AT73C203 integrates a power switch controller that, when connected to an external power switch, may be used for automatically selecting one of four possible power
Internal battery
External battery
Plugtop power supply unit 5V (PSU)
PC Host USB supply
The power switch output (VDD-PSU line) is connected directly to external auxiliary
components such as a radio or any other “current hungry” module.
The AT73C203 is also equipped with four digital rails from VDD-PSU to supply a baseband chip, a reset generator for the baseband chip, and a SPI interface to control the
AT73C203 via an internal register set. The USIM interface allows the application processor to communicate with and control a USIM card. Charge control enables the
application processor to charge the battery from the PSU or USB. A state machine
can also determine whether to charge the internal battery through USB at start-up.
Additionally, hardware monitoring gives information to the application processor when
a voltage drop occurs (programmed via internal registers).
Note: This is a summary document. A complete document
is available on our Web site at
Functional Diagram
Figure 1. AT73C203 Functional Diagram
Stand Alone
LDO Regulator
Digital Control
Converter Buck
0.9 V
(0.87 V to 1.2 V)/1.2 A
Internal 900 kHZ Oscillator
Very Low Temperature Shift
Converter Buck
1.2 V
(1 V to 1.8 V)/1.2 A
Serial Interface
Clock Distributor
8-bit ADC
Power Management
State Machine
Converter Buck
1.8 V
(1.7 V to 2.6 V)/1.2 A
DC-DC Converter
Boost - LDO 3.3V
(3 V to 5.4 V)/520 mA
Level Shifter
1.8 V/2.8 V/10 mA
Internal Voltage
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