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MAX1538 Datasheet

  • MAX1538

  • 电源选择器，用于双电池系统

  • 492.10KB

  • 22页

  • MAXIM   MAXIM

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19-3169; Rev 0; 1/04
Power-Source Selector for
Dual-Battery Systems
General Description
The MAX1538 selector provides power-source control
for dual-battery systems. The device selects between
an AC adapter and dual batteries based on the pres-
ence of the three power sources and the state of
charge of each battery. The MAX1538 includes analog
comparators to detect AC/airline-adapter presence and
determine battery undervoltage. Fast analog circuitry
allows the device to switch between power sources to
implement a break-before-make time, which allows hot
swapping of battery packs. The MAX1538 indepen-
dently performs power-source monitoring and selec-
tion, freeing the system power-management 碌P for
other tasks. This simplifies the development of 碌P
power-management firmware and allows the 碌P to enter
standby, reducing system power consumption.
The MAX1538 supports 鈥渞elearn mode,鈥?which allows
the system to measure and fully utilize battery capacity.
In this state, the part allows the selected battery to be
discharged even when an AC adapter is present. The
MAX1538 can also be used to power the system in an
aircraft. On detecting an airline adapter, the MAX1538
automatically disables charging or discharging of bat-
tery packs and only allows the system to be powered
from the adapter.
The MAX1538 is available in a space-saving 28-pin thin
QFN package with a maximum footprint of 5mm x 5mm.
Features
鈾?/div>
Automatically Detects and Responds to
Low-Battery Voltage Condition
Battery Insertion and Removal
AC-Adapter Presence
Airline-Adapter Presence
鈾?/div>
Step-Down and Step-Up Charger Compatibility
鈾?/div>
Fast Break-Before-Make Selection
Allows Hot Swapping of Power Sources
No External Schottky Diodes Needed
鈾?/div>
50碌A Maximum Battery Quiescent Current
鈾?/div>
Implements Battery Capacity Relearning
鈾?/div>
Allows Usage of Aircraft Supply
鈾?/div>
Direct Drive of P-Channel MOSFETs
鈾?/div>
Simplifies Power-Management 碌P Firmware
鈾?/div>
4.75V to 28V AC-Adapter Input Voltage Range
鈾?/div>
Small 28-Pin Thin QFN Package (5mm x 5mm)
MAX1538
Ordering Information
PART
MAX1538ETI
TEMP RANGE
-40掳C to +85掳C
PIN-PACKAGE
28 Thin QFN
Typical Operating Circuit
SYSTEM LOAD
ADAPTER
Applications
Notebook and Subnotebook Computers
Internet Tablets
Dual-Battery Portable Equipment
ACDET
AIRDET
ADPIN
REVBLK
EXTLD
BATTERY
CHARGER
CHG_OUT
CHGIN
CHRG
BATSEL
RELRN
OUT2
OUT1
OUT0
MAX1538
ADPBLK
V
DD
Pin Configuration appears at end of data sheet.
MINVA
CHGA
CHGB
DISB
GND
DISA
BATB
BATA
BATTERY B
BATTERY A
BATSUP
MINVB
________________________________________________________________
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.

MAX1538 PDF文件相关型号

MAX1538ETI,MAX1541EVKIT

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