19-2535; Rev 0; 7/02
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
General Description
Features
The MAX6439–MAX6442 are a family of ultra-low-power
battery monitors with integrated microprocessor (µP)
supervisors. The battery monitors are offered with sin-
gle or dual low-battery output options that can be used
to signal when the battery is OK (enabling full system
operation), when the battery is low (for low-power sys-
tem operation), and when the battery is dead (to dis-
able system operation). These devices also have an
ꢀ Factory-Trimmed V
Threshold Options for
BATT
Monitoring Single-Cell Li+ or Multicell
Alkaline/NiCd/NiMH Applications
ꢀ Immune to Short Battery Voltage Transients
ꢀ Low Current (2.5µA typ at 3.6V)
ꢀ Single and Dual Low-Battery Output Options
ꢀ 150ms Minimum LBO Timeout Period
ꢀ Independent µP Reset with Manual Reset
independent µP supervisor that monitors V
and pro-
CC
vides an active-low reset output. A manual reset func-
tion is available to reset the µP with a push-button. No
external components are required.
ꢀ Factory-Set Reset Thresholds for Monitoring V
CC
The MAX6439–MAX6442 are offered with several facto-
ry-trimmed low-battery threshold combinations ideal for
single-cell lithium-ion (Li+) or multicell alkaline/NiCd/
NiMH applications. When the battery voltage drops
below each specified low threshold, the low-battery out-
puts are asserted to alert the system. When the voltage
rises above the specified high thresholds, the outputs
are deasserted after a 150ms minimum timeout period,
ensuring the voltages have stabilized before power cir-
cuitry is activated or providing microprocessor reset tim-
ing. The low and high thresholds provide hysteresis in
battery-operated systems to eliminate output chattering.
from 1.8V to 3.3V
ꢀ Available with 150ms (min) and 1.2s (min) V
CC
Reset Timeout Period Options
ꢀ -40°C to +85°C Operating Temperature Range
ꢀ Small 6- and 8-Pin SOT23 Packages
ꢀ No External Components
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
8 SOT23-8
8 SOT23-8
MAX6439UT_ _ _D_-T
MAX6440UT_ _ _D_-T
MAX6441KA_ _ _D_-T
MAX6442KA_ _ _D_-T
The MAX6439/MAX6440 offer factory-trimmed battery
monitors with a single output. The MAX6441/MAX6442
offer factory-trimmed battery monitors with dual outputs.
All battery monitors have open-drain low-battery outputs.
The MAX6439–MAX6442 monitor system voltages
(V ) from 1.8V to 3.3V with seven fixed reset threshold
CC
options. Each device is offered with two minimum reset
timeout periods of 150ms or 1200ms. The MAX6439/
MAX6441 are offered with an open-drain RESET output
and the MAX6440/MAX6442 are offered with a push-
pull RESET output.
Note: The first two “_ _” are placeholders for the battery moni-
tor voltage levels. Desired threshold levels are set by the part
number suffix found in Tables 1 and 2. The third “_” is the V
CC
reset threshold level suffix found in Table 3. The “_” after the D
is a placeholder for the reset timeout period suffix found in
Table 4. All devices are available in tape-and-reel only. There
is a 2500-piece minimum order increment for standard ver-
sions. Sample stock is typically held on standard versions only.
Nonstandard versions require a minimum order increment of
10,000 pieces. Contact factory for availability.
The MAX6439–MAX6442 are offered in a SOT23 pack-
age and are fully specified over a -40°C to +85°C temp-
erature range.
Pin Configurations
Applications
Battery-Powered Systems (Single-Cell Li+ or
Two-/Three-Cell NiMH, NiCd, Alkaline)
TOP VIEW
V
1
2
3
6
5
4
V
CC
BATT
MR
Cell Phones/Cordless Phones
Portable Medical Devices
Electronic Toys
Pagers
MAX6439
MAX6440
GND
LBO
RESET
PDAs
SOT23-6
MP3 Players
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.
5秒后页面跳转
NTC热敏电阻与PTC热敏电阻的应用原理及应用范围
GTO与普通晶闸管相比为什么可以自关断？为什么普通晶闸管不能呢？从GTO原理、应用范围带你了解原因及推荐型号
LF353数据手册解读：特性、应用、封装、引脚说明、电气参数及替换型号推荐
A4950资料手册解读：特性、应用、封装、引脚功能、电气参数及代换型号
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
