MAX1924XEEE Maxim Integrated Products, MAX1924XEEE Datasheet

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MAX1924XEEE

Manufacturer Part Number
MAX1924XEEE
Description
MAX1924XEEEAdvanced Li+ Battery-Pack Protectors
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1924XEEE.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

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MAX1924XEEE Summary of contents

Page 1

... TEMP RANGE MAX1894XEEE -40°C to +85°C MAX1924VEEE -40°C to +85°C MAX1924XEEE -40°C to +85°C *Contact factory for alternative threshold voltages. Typical Applications Circuits appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’ ...

Page 2

Advanced Li+ Battery-Pack Protectors ABSOLUTE MAXIMUM RATINGS SRC, IC2, IC3 BN.......................................-0.3V to +28V CC IC1 to BN ..................................................................-0.3V to +6V DSO, TKO, CGO to BN.............................-0. B4P to B3P ...............................................................-0.3V to +6V B3P to B2P ...............................................................-0.3V to ...

Page 3

Advanced Li+ Battery-Pack Protectors ELECTRICAL CHARACTERISTICS (continued 0.1V, each battery cell voltage (V SRC B4P Typical values are +25°C.) A PARAMETER SYMBOL Charge-Voltage Comparator Threshold for Resetting Discharge-Current Fault Latch Discharge-Voltage Comparator Threshold ...

Page 4

Advanced Li+ Battery-Pack Protectors ELECTRICAL CHARACTERISTICS ( 0.1V, each battery cell voltage (V SRC B4P PARAMETER SYMBOL SRC Input Current Supply Current (Note 1) I Shutdown Supply Current I SHDN Charge-Mode Detection Threshold Overvoltage Threshold (Note 4) ...

Page 5

Advanced Li+ Battery-Pack Protectors (T = +25°C, unless otherwise noted.) A SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE 1.2 1.1 1.0 4-SERIES BATTERY PACK 0.9 0.8 0.7 0.6 0.5 0.4 -40 - TEMPERATURE (°C) OVERVOLTAGE THRESHOLD vs. TEMPERATURE ...

Page 6

Advanced Li+ Battery-Pack Protectors (T = +25°C, unless otherwise noted.) A DISCHARGE-CURRENT FAULT TIMING MAX1894 toc10 V PKN 100mV/div 0 DSO 5V/div 0 1ms/div PIN NAME 1 B4P Cell 4 Positive Connection. Short B4P to B3P for MAX1924V. Supply Input. ...

Page 7

Advanced Li+ Battery-Pack Protectors Detailed Description The MAX1894/MAX1924 battery-pack protectors super- vise the charging and discharging process of Li+ cells. Designed for 3-series (MAX1924V) and 4-series (MAX1894X/MAX1924X) applications, these devices monitor the voltage across each cell to provide protec- tion ...

Page 8

Advanced Li+ Battery-Pack Protectors OVERDISCHARGE PROTECTION PACK + R TKO 510Ω PACK - Figure 1. Typical Applications Circuit with Trickle Charge the direction of current flow. To reverse the current flow, the charger has to be removed (Figure 5). The ...

Page 9

Advanced Li+ Battery-Pack Protectors V DSO, CGO, TKO = H NO RESET UVF LATCH UVF = UVF + 1 NO RESET OVF LATCH OVF = OVF + 1 MAX1924 V = 200mV OV_HYT MAX1894 OV_HYT YES TKO, ...

Page 10

Advanced Li+ Battery-Pack Protectors CELL VOLTAGE SAMPLING DSO, CGO, TKO OVERVOLTAGE THRESHOLD CELL VOLTAGE SAMPLING TKO, CGO OVERVOLTAGE THRESHOLD CELL VOLTAGE OVERVOLTAGE THRESHOLD HYSTERESIS SAMPLING TKO, CGO Figure 4. Undervoltage and Overvoltage Timing Diagrams 10 ______________________________________________________________________________________ UNDERVOLTAGE CONDITION 320ms UNDERVOLTAGE ...

Page 11

Advanced Li+ Battery-Pack Protectors NORMAL OPERATION OC FAULT NO V < V RSENSE OC_TH FOR 3ms YES TKO, CGO = > 0.1V B4P SRC Figure 5. Charge-Current Fault Set the nominal values of the trickle ...

Page 12

Advanced Li+ Battery-Pack Protectors Table 2. State Table STATE CTL STATE L Undervoltage L Overvoltage L Charge Current Fault L Discharge Current Fault L Pack Short Current L Fault X Forced Shutdown by External µP X CTL H Deep Discharge ...

Page 13

Advanced Li+ Battery-Pack Protectors Table 3. MOSFET Selection P-CHANNEL MAXIMUM DRAIN MOSFETS IRF7404 IRF7406 Si4431 Si4947 (dual) Protecting and Filtering Cell Inputs Resistors in series with each B_P pin are recommend limit the current in case there is ...

Page 14

Advanced Li+ Battery-Pack Protectors B4P B3P SELECTOR B2P B1P OVER AND UNDER THRESHOLDS REF PKN BN B4P SRC Figure 8. Simplified Functional Diagram 14 ______________________________________________________________________________________ SHDN CELL CLOCK RDY OV FAULT STATE CMP MACHINE UV FAULT HYSTERESIS CMP +145mV CHARGE ...

Page 15

Advanced Li+ Battery-Pack Protectors OVERDISCHARGE PROTECTION PACK + PACK - Figure 9. Typical Applications Circuit without Trickle Charge ______________________________________________________________________________________ R5 10Ω 16 SRC 15 DSO OVERCHARGE 14 PROTECTION CGO 13 TKO D1 2 CMPSH B4P R4 C6 ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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