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MAX1773A Datasheet

  • MAX1773A

  • Power Source Selector for Dual-Battery Systems

  • 397.77KB

  • Maxim   Maxim

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19-1796; Rev 1; 1/03
KIT
ATION
EVALU
BLE
AVAILA
Power Source Selector for
Dual-Battery Systems
Features
o
Patented
鈥?/div>
7-MOSFET Topology Offers Low-Cost
Solution
o
Automatically Detects and Responds to:
Low Battery Voltage Condition
Battery Insertion and Removal
AC Adapter Presence
o
Direct Drive of P-Channel MOSFETs
o
Simplifies Power Management 碌P Firmware
o
Extends Battery Life by Allowing Power
Management 碌P to Enter Standby
o
4.75V to 28V AC Adapter Input Voltage Range
o
Integrated LDO with 1mA Drive Capability
o
Small Footprint 20-Pin TSSOP Package
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 bat-
tery 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/MAX1773A
detect low battery conditions using integrated analog
comparators 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 prob-
lem. The MAX1773/MAX1773A provide most of the power
source monitoring and selection, freeing the system power
management microprocessor (碌P) for other tasks. This not
only simplifies development of the power management
firmware for the 碌P but also allows the 碌P to enter standby,
thereby reducing system power consumption.
The MAX1773A is recommended for new designs.
MAX1773/MAX1773A
Ordering Information
PART
MAX1773EUP
MAX1773AEUP
TEMP. RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
20 TSSOP
20 TSSOP
________________________Applications
Notebook and Subnotebook Computers
PDAs and Handy-Terminals
Internet Tablets
Dual-Battery Portable Equipment
Pin Configuration appears at end of data sheet.
鈥?/div>
Covered by U.S. Patent number 5,764,032.
Typical Operating Circuit
FROM HOST
碌P
BATSEL
V
DD
MINV
3.3V
SYSTEM LOGIC SUPPLY
TO HOST
碌P
AC ADAPTER
INPUT
ACPRES
BATSTAT
ACDET
PDS
3.3V
MAX1773
MAX1773A
EXTLD
THMA
BATA
TCOMP
THMB
BATB
COMB
DISB
CHGB
BATTERY
B
BATTERY
A
COMA
DISA
CHGA
STEP-DOWN
CHARGER
OUTPUT
INPUT
OUTPUT
3.3V DC-DC
CONVERTER
INPUT
SYSTEM LOAD
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MAX1773A PDF文件相關(guān)型號

MAX1773AEUP

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