MAX6841DUKD2+T Maxim Integrated, MAX6841DUKD2+T Datasheet

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MAX6841DUKD2+T

Manufacturer Part Number
MAX6841DUKD2+T
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6841, MAX6842, MAX6843, MAX6844, MAX6845r
Datasheet
1.MAX6841DUKD2T.pdf (14 pages)

Specifications of MAX6841DUKD2+T

Number Of Voltages Monitored
1
Monitored Voltage
0.9 V to 1.5 V
Undervoltage Threshold
0.765 V
Overvoltage Threshold
0.81 V
Output Type
Active High, Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
40 ms
Supply Voltage - Max
1.8 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23
Chip Enable Signals
No
Maximum Power Dissipation
571 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
8.1 uA
Supply Voltage - Min
0.75 V
The MAX1906 protects against overvoltage conditions
in lithium-ion/lithium polymer (Li+) battery packs by
blowing a three-terminal protection fuse. The IC should
be used in conjunction with resettable protection cir-
cuits to provide a high level of safety against over-
charging Li+ batteries. It can be used with 2-, 3-, or
4-series cell battery packs.
The MAX1906 monitors individual cell voltages. If any
cell voltage exceeds the overvoltage threshold for
greater than 2.1s, the MAX1906 activates an internal
SCR. The SCR sinks sufficient current to blow an exter-
nal protection fuse, permanently disabling the battery
pack. Alternatively, the IC can drive the gate of an
external MOSFET to blow the fuse.
The MAX1906 also offers protection against disconnect-
ed voltage sense pins. If a disconnected pin is detected,
the DISCON output is forced low. The MAX1906 includes
a test mode, which determines if the circuit is operating
correctly while in an assembled battery pack.
The low-cost MAX1906 is available in a thermally
enhanced 16-pin QFN package.
19-2455; Rev 0; 4/02
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.
CONTROLLER
OPTIONAL
PACK
2-, 3-, or 4-Series Li+ Battery Packs for
Portable Products
PACK+
PACK-
VCC
Minimal Operating Circuit
FUSE
________________________________________________________________ Maxim Integrated Products
7
4
2
3
5
OUT
DISCON
DRV
TEST
PKN
General Description
MAX1906X
B4P
B3P
B2P
B1P
Applications
BN
16
14
12
10
8
Li+ Battery-Pack Protector with
o Protects Against Overvoltage
o ±1% Accurate Protection Thresholds
o Integrated 2.1s Fault-Delay Timer
o Built-in 1.5A SCR Fuse Driver
o Test Mode for Functional Verification in
o 8µA (max) Supply Current
o 1µA (max) Standby Current
o Protects Against Disconnected B1P–B4P Pins
o Protects 2-, 3-, or 4-Series Li+ Battery Packs
o Available in Small 16-Pin QFN Package
MAX1906SEGE -40°C to +85°C 16 QFN 5m m
MAX1906VEGE -40°C to +85°C 16 QFN 5m m
MAX1906XEGE -40°C to +85°C 16 QFN 5m m
Integrated Fuse Driver
Assembled Pack
(5mm x 5mm)
PART
DISCON
TEST
DRV
I.C.
[]:MAX1906V, MAX1906X
():MAX1906X
TEMP RANGE PIN-PACKAGE
1
2
3
4
5mm x 5mm QFN
16
Ordering Information
5
MAX1906S/V/X
15
6
Pin Configuration
14
7
13
8
12
11
10
9
Features
✕
✕
✕
B2P
N.C.
B1P
I.C.
5mm
5mm
5mm
CELLS
2
3
4
1

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MAX6841DUKD2+T Summary of contents

Page 1

... DRV CONTROLLER 3 TEST 5 PKN PACK- ________________________________________________________________ Maxim Integrated Products 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. Li+ Battery-Pack Protector with Integrated Fuse Driver o Protects Against Overvoltage o ±1% Accurate Protection Thresholds o Integrated 2.1s Fault-Delay Timer o Built-in 1 ...

Page 2

Li+ Battery-Pack Protector with Integrated Fuse Driver ABSOLUTE MAXIMUM RATINGS B4P to BN ...............................................................-0.3V to +24V B3P to BN ...............................................................-0.3V to +18V B2P to BN ...............................................................-0.3V to +12V B4P to B3P, B3P to B2P, B2P to B1P, B1P to BN ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 0°C to +85°C, individual cell voltages = 4.2V unless otherwise noted. Typical values are PARAMETER SYMBOL Disconnected Pin Test Time TEST Input High Minimum TEST High Duration TEST Input Low TEST Pulldown ...

Page 4

Li+ Battery-Pack Protector with Integrated Fuse Driver (T = +25°C, unless otherwise noted.) A OVERVOLTAGE THRESHOLD vs. TEMPERATURE 4.455 4.450 4.445 4.440 -40 - TEMPERATURE (°C) STANDBY CURRENT vs. TEMPERATURE 0.70 0.68 0.66 0.64 0.62 0.60 ...

Page 5

PIN MAX1906S MAX1906V MAX1906X 11, 13 11, 13 11, 13 ...

Page 6

Li+ Battery-Pack Protector with Integrated Fuse Driver PACK+ PACK CONTROLLER Figure 1. Typical Application Circuit for 4-Series Battery Packs—Using the Internal SCR to Blow the Protection Fuse PACK+ PACK CONTROLLER PACK- Figure 2. Typical Application Circuit for 4-Series Battery Packs—Using ...

Page 7

OUT IC DISCON IC MAX1906S DRV B2P TEST B1P PKN BN Figure 3. Cell Connections for 2- and 3-Series Battery Packs DRV DRIVER PKN OUT SCR SCR DRIVER BN Figure 4. MAX1906 Functional Diagram _______________________________________________________________________________________ Li+ Battery-Pack Protector with Integrated ...

Page 8

Li+ Battery-Pack Protector with Integrated Fuse Driver OVERDISCHARGE THREE-TERMINAL PROTECTION PROTECTION FUSE PACK+ SFD-145B VCC 7 OUT B4P R5 100kΩ 4 DISCON B3P DISCON MAX1906X 2 DRV B2P 3 TEST TEST B1P 5 BN PKN PACK- Figure 5. Typical Application ...

Page 9

I SUP 0.8ms V B_P V DRV NOTE: ALL VALUES ARE TYPICAL. Figure 6. Current Consumption of Chip in Different States V TEST 50µs I SUP V DRV V DISCON Figure 7. Timing Diagram for Test Mode high and ...

Page 10

Li+ Battery-Pack Protector with Integrated Fuse Driver NO NO ALL CELLS CHECKED? YES WAIT 2.56s NO NO Figure 8. Overvoltage Protection Protection Features Overvoltage Detection If any cell voltage exceeds the overvoltage threshold, the MAX1906 stops sampling and monitors the ...

Page 11

Design Procedure Fuse Drive Options The MAX1906 supports two methods for blowing the external protection fuse: the internal SCR can be directly connected to the fuse’s heater terminal or an external MOSFET can be used to drive the heater. The ...

Page 12

Li+ Battery-Pack Protector with Integrated Fuse Driver RC Filters On Cell Inputs The MAX1906 has an unused pin placed between each of the cell connections. These extra pins minimize the risk of a solder short between pins during the assem- ...

Page 13

For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Li+ Battery-Pack Protector with Integrated Fuse Driver Package Information 13 ...

Page 14

... 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2002 Maxim Integrated Products ...

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