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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1894 Datasheet

Advanced Li+ Battery-Pack Protectors

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MAX1894 pdf
19-2278; Rev 0; 4/02
Advanced Li+ Battery-Pack Protectors
General Description
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.
Applications
3- or 4-Series Li+ Battery Packs
Features
o Protect Against Cell Overvoltage
Factory Programmable Limits from 4V to 4.4V
Accurate to ±0.5%
o Protect Against Cell Undervoltage
Factory Programmable Limits from 2V to 3.2V
Accurate to ±2.0%
o Protect Against Charge, Discharge, and Pack-
Short Current Faults
o Automatically Trickle Charges Deeply Discharged
Cells
o Fully Integrated MOSFET Drivers Do Not Require
Pullup Resistors
o 0.8µA (typ) Shutdown Supply Current Prevents
Deep Discharge of Cells
o 30µA (typ) Operating Supply Current
o 28V (max) Input Voltage
o Available in Small 16-Pin QSOP Package
Pin Configuration
TOP VIEW
B4P 1
VCC 2
B3P 3
IC3 4
B2P 5
IC2 6
B1P 7
IC1 8
MAX1894
MAX1924
16 SRC
15 DSO
14 CGO
13 TKO
12 SHDN
11 CTL
10 PKN
9 BN
QSOP
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1894XEEE
-40°C to +85°C 16 QSOP
MAX1924VEEE
-40°C to +85°C 16 QSOP
MAX1924XEEE
-40°C to +85°C 16 QSOP
*Contact factory for alternative threshold voltages.
Typical Applications Circuits appear at end of data sheet.
CELLS
4
3
4
OVERVOLTAGE
4.25V*
4.35V*
4.35V*
OVERVOLTAGE
THRESHOLD HYSTERESIS
No
Yes
Yes
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1894 Datasheet

Advanced Li+ Battery-Pack Protectors

No Preview Available !

MAX1894 pdf
Advanced Li+ Battery-Pack Protectors
ABSOLUTE MAXIMUM RATINGS
SRC, IC2, IC3, VCC to BN.......................................-0.3V to +28V
IC1 to BN ..................................................................-0.3V to +6V
DSO, TKO, CGO to BN.............................-0.3V to (VSRC + 0.3V)
B4P to B3P ...............................................................-0.3V to +6V
B3P to B2P ...............................................................-0.3V to +6V
B2P to B1P ...............................................................-0.3V to +6V
B1P to BN .................................................................-0.3V to +6V
CTL, SHDN to PKN...................................................-0.3V to +6V
PKN to BN ...................................................................-2V to +2V
ESD Protection on All Pins ...............................................±2000V
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VSRC = VB4P + 0.1V, each battery cell voltage (VCELL) = 3.6V, VCTL = VSHDN = VPKN, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
SRC Input Current
Supply Current (Note 1)
Shutdown Supply Current
Top Cell Sampling Current
(Note 2)
SYMBOL
ISUP
ISHDN
CONDITIONS
VSRC - VB_P = 1V
No faults
Undervoltage without charge source
VCELL = 3.6V
MIN TYP MAX UNITS
20 40
µA
30 45
µA
0.8 2
µA
60 µA
Intermediate Cell Input Bias
Current (Note 3)
VCELL = 3.6V
500 pA
VCC Undervoltage Lockout
Threshold
Rising edge, hysteresis = 1% falling edge
4.5
V
Charge-Mode Detection
Threshold
VSRC - VB4P
25 100 mV
Overvoltage Threshold (Note 4)
MAX1894X cell voltage rising
VOV_TH
MAX1924X, MAX1924V cell voltage rising
4.225 4.250 4.275
4.325 4.350 4.375
V
Overvoltage Threshold
Hysteresis
VOV_HYT MAX1924X, MAX1924V cell voltage falling
200
mV
Undervoltage Threshold (Note 4)
PKN to BN Discharge Current
Fault Threshold
VUV_TH
VOD_TH
Cell voltage falling
2.260
130
2.300
145
2.340
160
V
mV
PKN to BN Charge Current
Fault Threshold
PKN to BN Discharge Current
Fault Threshold, Pack-Short
Condition
Discharge or Charge Current
Fault to DSO, CGO, TKO
Transition Delay Time
Discharge Current Fault to DSO
Transition Time Delay for Pack-
Short Condition
VOC_TH
VPS_TH
tI-DELAY
tP-DELAY
-120 -100 -80
385 405 425
mV
mV
2.5 3 3.5 ms
400 450 500
µs
2 _______________________________________________________________________________________


Part Number MAX1894
Description Advanced Li+ Battery-Pack Protectors
Maker Maxim
Total Page 16 Pages
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