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Features
* 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 A with External "Button Select" for Restart Applications Include: PDAs, PCMCIA Cards, SMART Phones, Pocket PCs, 3G Applications, Intel(R) XScaleTM Powered Applications
* * * * * * * * * *
Power Management AT73C203 Power Management IC for Datacom Platforms Summary
Description
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 sources: * * * * 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).
2742BS-PMGMT-03/04
Note: This is a summary document. A complete document is available on our Web site at www.atmel.com.
Functional Diagram
Figure 1. AT73C203 Functional Diagram
Stand Alone LDO Regulator
Power Switch
DC-DC Converter Buck 0.9 V (0.87 V to 1.2 V)/1.2 A
Digital Control
Internal 900 kHZ Oscillator Very Low Temperature Shift DC-DC 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
DC-DC Converter Buck 1.8 V (1.7 V to 2.6 V)/1.2 A
Measurement Bridge ISO 7816 UART DC-DC Converter Boost - LDO 3.3V (3 V to 5.4 V)/520 mA
Temperature Sensor
SIM Level Shifter Battery Charger Internal Voltage Reference
SIM LDO 1.8 V/2.8 V/10 mA
2
AT73C203
2742BS-PMGMT-03/04
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2742BS-PMGMT-03/04

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