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Part Number: MAX1773A
Description: The MAX1773/MAX1773A highly integrated ICs serve as the control logic for a system with multiple power...
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MAX1773A
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DataSheet
General Description
MAX1773A General Description
The MAX1773/MAX1773A highly integrated ICs serve as the control logic for a system with multiple power sources. They directly drive external P-channel MOSFETs to select from an AC adapter and dual battery sources for charge and discharge. The selection is made based on the presence of the power sources and the state of the batteries. The MAX1773/MAX1773Adetect low battery conditions using integrated analogcomparators and check for the presence of a battery by using battery thermistor outputs.
The MAX1773/MAX1773A are designed for use with a buck topology charger. They provide a simple and easily controlled solution to a difficult analog power control problem. The MAX1773/MAX1773A provide most of the power source monitoring and selection, freeing the system power management microprocessor (P) for other tasks. This not only simplifies development of the power management firmware for the P but also allows the P to enter standby, thereby reducing system power consumption.
The MAX1773A is recommended for new designs.
MAX1773A Maximum Ratings
VBATA, VBATB to GND ............................................-0.3V to +20V
VCOMA to GND........................................-0.3V to (VBATA + 0.3V)
VCOMB to GND........................................-0.3V to (VBATB + 0.3V)
VCHGA, VCHGB, VEXTLD, VACDET to GND ...............0.3V to +30V
VPDS, VDISA, VDISB to GND..................-0.3V to (VEXTLD + 0.3V)
VDD, VBATSEL, V ACPRES, VBATSTAT, VTCOMP,
VMINV to GND......................................................,,,.-0.3V to +6V
VTHMA, VTHMB (Note 1).......................................... -0.3V to +6V
Continuous Current out of THMA, THMB..............................20mA
I ACPRES, IBATSTAT Sink Current........................................30mA
Continuous Power Dissipation (TA = +70)
20-Pin TSSOP (derate 7.0mW/ above +70) ...............560mW
Operating Temperature ........................................-40 to +85
Storage Temperature ..........................................-65 to +150
Lead Temperature (soldering, 10s) ...................................+300
MAX1773A Features
Patented† 7-MOSFET Topology Offers Low-Cost Solution
Automatically Detects and Responds to: Low Battery Voltage Condition Battery Insertion and Removal AC Adapter Presence
Direct Drive of P-Channel MOSFETs
Simplifies Power Management P Firmware
Extends Battery Life by Allowing Power Management P to Enter Standby
4.75V to 28V AC Adapter Input Voltage Range
Integrated LDO with 1mA Drive Capability
Small Footprint 20-Pin TSSOP Package
MAX1773A Typical Application
Notebook and Subnotebook Computers PDAs and Handy-Terminals Internet Tablets Dual-Battery Portable Equipment
MAX1773A
PDF/DataSheet Download
- Datasheet: MAX1773A
- File Size: 407319 KB
- Manufacturer: Maxim
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