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MAX6440UTM Schematic ( PDF Datasheet ) - Maxim Integrated

Teilenummer MAX6440UTM
Beschreibung Low-Power / Single-/Dual-Level Battery Monitors with Hysteresis and Integrated P Reset
Hersteller Maxim Integrated
Logo Maxim Integrated Logo 




Gesamt 14 Seiten
MAX6440UTM Datasheet, Funktion
19-2535; Rev 0; 7/02
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
General Description
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
independent µP supervisor that monitors VCC and pro-
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.
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.
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
(VCC) from 1.8V to 3.3V with seven fixed reset threshold
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.
The MAX6439–MAX6442 are offered in a SOT23 pack-
age and are fully specified over a -40°C to +85°C temp-
erature range.
Applications
Battery-Powered Systems (Single-Cell Li+ or
Two-/Three-Cell NiMH, NiCd, Alkaline)
Cell Phones/Cordless Phones
Portable Medical Devices
Electronic Toys
Pagers
PDAs
MP3 Players
Features
o Factory-Trimmed VBATT Threshold Options for
Monitoring Single-Cell Li+ or Multicell
Alkaline/NiCd/NiMH Applications
o Immune to Short Battery Voltage Transients
o Low Current (2.5µA typ at 3.6V)
o Single and Dual Low-Battery Output Options
o 150ms Minimum LBO Timeout Period
o Independent µP Reset with Manual Reset
o Factory-Set Reset Thresholds for Monitoring VCC
from 1.8V to 3.3V
o Available with 150ms (min) and 1.2s (min) VCC
Reset Timeout Period Options
o -40°C to +85°C Operating Temperature Range
o Small 6- and 8-Pin SOT23 Packages
o No External Components
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6439UT_ _ _D_-T -40°C to +85°C 6 SOT23-6
MAX6440UT_ _ _D_-T -40°C to +85°C 6 SOT23-6
MAX6441KA_ _ _D_-T -40°C to +85°C 8 SOT23-8
MAX6442KA_ _ _D_-T -40°C to +85°C 8 SOT23-8
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 VCC
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.
Pin Configurations
TOP VIEW
VBATT 1
6 VCC
MAX6439
MR 2 MAX6440 5 GND
LBO 3
4 RESET
SOT23-6
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.






MAX6440UTM Datasheet, Funktion
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
Typical Operating Characteristics (continued)
(VBATT = 1.2V to 5.5V, VCC = 1.2V to 5.5V, unless otherwise specified. Typical values are at TA = +25°C.)
MAXIMUM VBATT TRANSIENT DURATION
vs. LTH THRESHOLD OVERDRIVE
120
MAXIMUM VCC TRANSIENT DURATION
vs. VTH THRESHOLD OVERDRIVE
60
NORMALIZED UPPER (HTH) AND LOWER
(LTH) TRIP VOLTAGES vs. TEMPERATURE
1.050
110
LBO ASSERTS ABOVE
100 THIS LINE
90
80
70
60
10
100
LTH THRESHOLD OVERDRIVE (mV)
1000
55
50
45
40
35
30
25
20
10
RESET ASSERTS ABOVE
THIS LINE
1.025
1.000
0.975
LOWER TRIP VOLTAGE
UPPER TRIP VOLTAGE
100
VTH THRESHOLD OVERDRIVE (mV)
1000
0.950
-40 -20 0 20 40 60
TEMPERATURE (°C)
80
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
1.050
LBO OUTPUT vs. SINK CURRENT
VCC = 3.3V, VBATT = 2.1V
120
1.025
100
80
1.000
60
0.975
0.950
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
RESET OUTPUT vs. SINK CURRENT
VCC = 2.1V, VBATT = 3.6V
140
120
100
80
60
40
RESET ASSERTED
20
0
0 2 4 6 8 10
ISINK (mA)
40
20
LBO ASSERTED
0
0 2 4 6 8 10
ISINK (mA)
RESET OUTPUT vs. SOURCE CURRENT
VCC = 3.3V, VBATT = 3.6V
3.50
3.25
3.00
2.75
2.50
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
ISOURCE (mA)
6 _______________________________________________________________________________________

6 Page









MAX6440UTM pdf, datenblatt
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
PART
MAX6439
MAX6440
MAX6441
MAX6442
OPEN-DRAIN
RESET
X
X
PUSH-PULL RESET
X
X
Selector Guide
SINGLE LOW-
BATTERY OUTPUT
X
X
DUAL LOW-BATTERY
OUTPUT
X
X
Standard Versions Table
PART
MAX6439UTDHRD3
MAX6439UTDHSD3
MAX6439UTEHRD3
MAX6439UTEHSD3
MAX6439UTEIRD3
MAX6439UTEISD3
MAX6440UTDHRD3
MAX6440UTDHSD3
MAX6440UTEHRD3
MAX6440UTEHSD3
MAX6440UTEIRD3
MAX6440UTEISD3
MAX6441KADHRD3
MAX6441KADHSD3
MAX6441KAEHRD3
MAX6441KAEHSD3
MAX6441KAEIRD3
MAX6441KAEISD3
MAX6442KADHRD3
MAX6442KADHSD3
MAX6442KAEHRD3
MAX6442KAEHSD3
MAX6442KAEIRD3
MAX6442KAEISD3
TOP MARK
ABMN
ABMO
ABMP
ABMQ
ABMR
ABMS
ABMT
ABMU
ABMV
ABMW
ABMX
ABMY
AEEI
AEEJ
AEEK
AEEL
AEEM
AEEN
AEEO
AEEP
AEEQ
AEER
AEES
AEET
Typical Application Circuit
DC/DC
Li+
3.6V
VCC
MR LBO
MAX6439
MAX6440
VBATT
RESET
GND
VCC
NMI
µP
RESET
GND
Pin Configurations (continued)
TOP VIEW
VBATT 1
GND 2
MR 3
LBOLH 4
MAX6441
MAX6442
8 VCC
7 LBOL
6 LBOH
5 RESET
SOT23-8
Chip Information
TRANSISTOR COUNT: 1478
PROCESS: BiCMOS
12 ______________________________________________________________________________________

12 Page





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