MAX1894XEEE Maxim Integrated, MAX1894XEEE Datasheet
MAX1894XEEE
Manufacturer Part Number
MAX1894XEEE
Description
Battery Management
Manufacturer
Maxim Integrated
Series
MAX1894, MAX1924r
Datasheet
1.MAX1894XEEE.pdf
(16 pages)
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The MAX1894/MAX1924 are lithium-ion/lithium-polymer
(Li+) battery-pack protector ICs for 3- or 4-series Li+ bat-
tery packs. The MAX1894/MAX1924 enhance the useful
operating life of Li+ batteries by monitoring individual cell
voltages and preventing over/undervoltage conditions.
The MAX1894/MAX1924 also protect the battery pack
against charge current, discharge current, and pack-
short fault conditions.
In case of a fault condition, on-board drivers control
external P-channel MOSFETs, which disconnect the cells
from the pack external terminals. The external protection
MOSFETs are connected in a common-source configura-
tion that does not require external pullup resistors. The
MAX1894/MAX1924 use only one current-sense resistor
to achieve the protection features. All protection thresh-
olds and delays do not require any external components
and are trimmed at the factory.
If any cell voltage drops below the undervoltage thresh-
old, the MAX1894/MAX1924 disconnect the pack from
the load and power down to prevent deep discharge of
the pack. The MAX1894/MAX1924 offer a trickle-charge
feature, which provides a low-current path to safely
charge a deeply discharged pack. The MAX1894/
MAX1924 also have two logic-level inputs, which can be
used by a microcontroller to disable the protection
MOSFETs and to put the device in shutdown. The
MAX1894/MAX1924 have low quiescent current (30µA
typ) and ultra-low shutdown current (0.8µA typ) to pre-
vent deep-cell discharge.
The MAX1894X is designed for 4-series battery packs,
without hysteresis on the protection thresholds. The
MAX1924V and MAX1924X include hysteresis for the 3-
and 4-series packs, respectively.
19-2278; Rev 0; 4/02
*Contact factory for alternative threshold voltages.
Typical Applications Circuits appear at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX1894XEEE
MAX1924VEEE
MAX1924XEEE
3- or 4-Series Li+ Battery Packs
PART
________________________________________________________________ Maxim Integrated Products
Advanced Li+ Battery-Pack Protectors
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
General Description
Applications
PIN-PACKAGE
16 QSOP
16 QSOP
16 QSOP
CELLS
o Protect Against Cell Overvoltage
o Protect Against Cell Undervoltage
o Protect Against Charge, Discharge, and Pack-
o Automatically Trickle Charges Deeply Discharged
o Fully Integrated MOSFET Drivers Do Not Require
o 0.8µA (typ) Shutdown Supply Current Prevents
o 30µA (typ) Operating Supply Current
o 28V (max) Input Voltage
o Available in Small 16-Pin QSOP Package
4
3
4
Short Current Faults
Cells
Pullup Resistors
Deep Discharge of Cells
Factory Programmable Limits from 4V to 4.4V
Accurate to ±0.5%
Factory Programmable Limits from 2V to 3.2V
Accurate to ±2.0%
TOP VIEW
OVERVOLTAGE
4.25V*
4.35V*
4.35V*
B4P
V
B3P
B2P
B1P
IC3
IC2
IC1
CC
1
2
6
3
4
5
7
8
Ordering Information
MAX1894
MAX1924
QSOP
Pin Configuration
THRESHOLD HYSTERESIS
OVERVOLTAGE
16
15
14
13
12
11
10
9
SRC
SHDN
CTL
PKN
BN
DSO
CGO
TKO
Yes
Yes
No
Features
1