Maxim MAX6432EIUS-T Datasheet
General Description
The MAX6427–MAX6438 are single/dual-level battery monitors with internal hysteresis. These devices are offered with
single (MAX6427/MAX6428/MAX6429, MAX6433/
MAX6434/MAX6435) or dual (MAX6430/MAX6431/
MAX6432, MAX6436/MAX6437/MAX6438) low-battery output indicators, which can be used to indicate three battery
conditions: battery is good (operate system in normal
mode), battery is weak (operate system in low-power
mode), or battery is empty (disable the system).
These devices are ideal for monitoring single lithium-ion
(Li+) cells or multicell alkaline/NiCd/NiMH power supplies.
When the power-supply voltage drops below the specified
low threshold, the low-battery output asserts. When the
voltage rises above the specified high threshold, the lowbattery output is deasserted following a 140ms minimum
timeout period. The timeout period ensures that the supply
voltages have stabilized before power-converter or microprocessor activity is enabled.
The MAX6427–MAX6438 family is available with several
monitoring options. The MAX6427/MAX6428/MAX6429
offer factory-trimmed battery-monitor thresholds, with a single low-battery output. The MAX6430/MAX6431/MAX6432
also feature factory-trimmed thresholds, but have two lowbattery outputs.
The MAX6433–MAX6438 have user-adjustable threshold
voltages permitting the user to select the hysteresis range,
and consequently the sensitivity of the system to noise. A
wide hysteresis range also prevents chattering that can
result due to battery recovery after load removal. Single
low-battery outputs are supplied by the MAX6433/
MAX6434/MAX6435 and dual low-battery outputs by the
MAX6436/MAX6437/MAX6438.
The MAX6427–MAX6438 family is available with three output logic options for convenient interface with system
power circuitry or microprocessors. The family is offered in
small SOT23 and SOT143 packages and is fully specified
over temperature.
________________________Applications
Battery-Powered Systems (Single-Cell Li+ or
Two/Three-Cell NiMH, NiCd, Alkaline)
Cell Phones/Cordless Phones Pagers
Portable Medical Devices PDAs
Electronic Toys MP3 Players
Features
♦ Factory-Trimmed or User-Adjustable Threshold
Options
Factory-Trimmed Low Thresholds from 1.6V to
2.1V or 2.6V to 3.1V in 100mV Increments
(MAX6427–MAX6432)
Factory-Trimmed High Thresholds from 2.3V to
2.6V or 3.3V to 3.6V in 100mV Increments
(MAX6427–MAX6432)
User-Adjustable Low/High Thresholds with
615mV Internal Reference (MAX6433–MAX6438)
♦ Low Current (1µA, typ)
♦ Single or Dual Low-Battery Outputs
♦ Push-Pull LBO, Open-Drain LBO, and Open-Drain
LBO Options
♦ 140ms Minimum LBO Timeout Period
♦ Immune to Short Battery Voltage Transients
♦ Guaranteed Valid LBO Logic State to BATT = 1.0V
♦ -40°C to +85°C Operating Temperature Range
♦ Small 3, 4, 5 and 6-Pin SOT Packages
♦ No External Components Required
(MAX6427–MAX6432)
MAX6427–MAX6438
Low-Power, Single/Dual-Level Battery Monitors
with Hysteresis
________________________________________________________________ Maxim Integrated Products 1
19-2323; Rev 1; 9/03
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.
Ordering Information
Typical Operating Circuit appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX6427_ _UR-T -40°C to +85°C 3 SOT23-3
Ordering Information continued at end of data sheet.
Pin Configurations continued at end of data sheet.
†
The MAX6427–MAX6432 are available with factory-trimmed
battery-monitor thresholds. Select the desired thresholds
using Tables 1 or 2 and enter the corresponding letters in
the part number by replacing “_ _”.
Note: There are 26 standard versions with a required order
minimum of 2500 pieces. Sample stock is generally held on
the standard versions only (see Standard Versions Table).
Required order increment is 10,000 pieces for nonstandard
versions. Contact factory for availability. All devices available in tape-and-reel only.
BATT
1
3 GND
( ) ARE FOR THE MAX6429.
MAX6427
MAX6428
MAX6429
SOT23-3
TOP VIEW
2
LBO
(LBO)
Pin Configurations
MAX6427–MAX6438
Low-Power, Single/Dual-Level Battery Monitors
with Hysteresis
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(BATT = 1.0V to 5.5V or VDD= 1.6V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)
(Note 1)
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.
BATT, VDDto GND ................................................-0.3V to +6.0V
HTHIN, LTHIN Inputs to GND.....................-0.3V to (V
DD
+ 0.3V)
Open-Drain LBO/LBO, LBOH/LBOH,
LBOL/LBOL to GND .........................................-0.3V to +6.0V
Push-Pull LBO/LBO, LBOH/LBOH,
LBOL/LBOL to GND ................-0.3V to (BATT or V
DD
+ 0.3V)
Input Current (all pins) ........................................................20mA
Output Current (all pins) .....................................................20mA
Continuous Power Dissipation (T
A
= +70°C)
3-Pin SOT23-3 (derate 4.0mW/°C above +70°C) .......320mW
4-Pin SOT143-4 (derate 4.0mW/°C above +70°C) .....320mW
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .......571mW
6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) .......696mW
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TA = -40°C to +85°C
1.2 5.5
Operating Voltage Range V
BATT
TA = 0°C to +70°C
1.0 5.5
V
Operating Voltage Range V
DD
TA = -40°C to +85°C 1.6 5.5 V
BATT Supply Current I
BATT
V
BATT
= 3.7V, no load (MAX6427–MAX6432) 1 1.5 µA
VDD Supply Current I
DD
V
DD
= 3.7V, no load
(MAX6433–MAX6438)
1 1.5 µA
FACTORY-FIXED THRESHOLDS (MAX6427–MAX6432)
HTH Threshold
(Note 2)
V
HTH
Factory-fixed options, BATT rising,
LBO deasserted when BATT rises above
V
HTH
(MAX6427/MAX6428/MAX6429)
-2.5 +2.5 %
LTH Threshold
(Note 2)
V
LTH
Factory-fixed options, BATT falling,
LBO asserted when BATT falls below V
LTH
(MAX6427/MAX6428/MAX6429)
-2.5 +2.5 %
HTH- Threshold
(Note 2)
V
HTH-
Factory-fixed options, BATT falling, LBOH
asserted when BATT falls below V
HTH-
(MAX6430/MAX6431/MAX6432)
-2.5 +2.5 %
HTH+ Threshold
(Note 3)
V
HTH+
Factory-fixed options, BATT rising,
LBOH deasserted when BATT rises above
V
HTH+
(MAX6430/MAX6431/MAX6432)
-2.5 +2.5 %
LTH- Threshold
(Note 2)
V
LTH-
Factory-fixed options, BATT falling,
LBOL asserted when BATT falls below V
LTH-
(MAX6430/MAX6431/MAX6432)
-2.5 +2.5 %
LTH+ Threshold
(Note 3)
V
LTH+
Factory-fixed options, BATT rising,
LBOL deasserted when BATT rises above
V
LTH+
(MAX6430/MAX6431/MAX6432)
-2.5 +2.5 %
MAX6427–MAX6438
Low-Power, Single/Dual-Level Battery Monitors
with Hysteresis
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(BATT = 1.0V to 5.5V or VDD= 1.6V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)
(Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
USER-ADJUSTABLE THRESHOLDS (MAX6433–MAX6438)
HTHIN Threshold
(Note 4)
V
HTHIN
User-adjustable options, HTHIN rising,
LBO is deasserted when HTHIN rises above
V
HTHIN-
, V
REF
= 615mV
(MAX6433/MAX6434/MAX6435)
-2.5 +2.5 %
LTHIN Threshold
(Note 4)
V
LTHIN
User-adjustable options, LTHIN falling,
LBOH is asserted when LTHIN falls below
V
LTHIN-
, V
REF
= 615mV
(MAX6433/MAX6434/MAX6435)
-2.5 +2.5 %
HTHIN+ Threshold
(Note 4)
V
HTHIN+
User-adjustable options, HTHIN rising,
LBOH is deasserted when HTHIN rises
above V
HTHIN+
, V
REF
= 615mV
(MAX6436/MAX6437/MAX6438)
-2.5 +2.5 %
HTHIN- Threshold
(Note 5)
V
HTHIN-
User-adjustable options, HTHIN falling,
LBOH is asserted when HTHIN falls below
V
HTHIN-
, V
REF
= 585mV
(MAX6436/MAX6437/MAX6438)
-2.5 +2.5 %
LTHIN+ Threshold
(Note 4)
V
LTHIN+
User-adjustable options, LTHIN rising,
LBOL is deasserted when LTHIN rises
above V
LTHIN+
, V
REF
= 615mV
(MAX6436/MAX6437/MAX6438)
-2.5 +2.5 %
LTHIN- Threshold
(Note 5)
V
LTHIN-
User-adjustable options, LTHIN falling,
LBOL is asserted when LTHIN falls below
V
LTHIN-
, V
REF
= 585mV
(MAX6436/MAX6437/MAX6438)
-2.5 +2.5 %
HTHIN/LTHIN Leakage Current
(Note 6)
I
LKG
V
HTHIN
or V
LTHIN
> 400mV 20 nA
MAX6427–MAX6438
Low-Power, Single/Dual-Level Battery Monitors
with Hysteresis
4 _______________________________________________________________________________________
Note 1: Production testing done at TA= +25°C, limits over temperature guaranteed by design only.
Note 2: Percentage of selected factory-fixed HTH- or LTH- threshold voltage.
Note 3: Percentage of 1.05
✕
(selected factory-fixed threshold voltage).
Note 4: Percentage of 615mV voltage reference.
Note 5: Percentage of 585mV voltage reference.
Note 6: Guaranteed by design.
Note 7: V
SUPPLY
is BATT or VDD.
ELECTRICAL CHARACTERISTICS (continued)
(BATT = 1.0V to 5.5V or VDD= 1.6V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)
(Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LOW-BATTERY OUTPUTS (LBO, LBO, LBOH, LBOH, LBOL, LBOL )
Timeout Period t
LBOP
BATT or VDD/HTHIN/LTHIN rising above
threshold
140 210 280 ms
Delay t
LBOD
BATT or VDD/HTHIN/LTHIN falling below
threshold
100 µs
BATT or V
DD
≥ 1.6V, I
SINK
= 100µA,
asserted low
0.3
BATT or V
DD
≥ 2.7V, I
SINK
= 1.2mA,
asserted low
0.3
LBO/LBOL/LBOH Output LOW
(Push-Pull or Open-Drain)
V
OL
BATT or V
DD
≥ 4.5V, I
SINK
= 3.2mA,
asserted low
0.4
V
BATT or V
DD
≥ 1.6V, I
SOURCE
= 200µA,
deasserted
0.8 × V
SUPPLY
BATT or V
DD
≥ 2.7V, I
SOURCE
= 500µA,
deasserted
0.8 × V
SUPPLY
LBO Output HIGH (Push-Pull
Only) (Note 7)
V
OH
BATT or V
DD
≥ 4.5V, I
SOURCE
= 800µA,
deasserted
0.8 × V
SUPPLY
V
LBO Output Leakage Current
(Open-Drain Only)
I
LKG
LBO deasserted 500 nA
BATT or V
DD
≥ 1.6V, I
SINK
= 100µA,
deasserted low
0.3
BATT or V
DD
≥ 2.7V, I
SINK
= 1.2mA,
deasserted low
0.3
LBO/LBOL/LBOH Output
LOW (Open-Drain Only)
V
OL
BATT or V
DD
≥ 4.5V, I
SINK
= 3.2mA,
deasserted low
0.4
V
LBO Output Leakage Current
(Open-Drain Only)
I
LKG
LBO asserted 500 nA
0
0.6
0.3
1.2
0.9
1.5
1.8
-40 20 40-20 0 60 80
SUPPLY CURRENT
vs. TEMPERATURE
MAX6427 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
V
BATT
= 5V
V
BATT
= 3.3V
V
BATT
= 2V
LBO NOT ASSERTED
1.010
1.005
1.000
0.995
0.990
-40 20-20 0 40 60 80
NORMALIZED LBO TIMEOUT PERIOD
vs. TEMPERATURE
MAX6427 toc02
TEMPERATURE (°C)
NORMALIZED LBO TIMEOUT PERIOD
80
60
40
20
0
10 100 1000
MAXIMUM TRANSIENT DURATION
vs. LBO COMPARATOR OVERDRIVE
MAX6427 toc03
LBO COMPARATOR OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (µs)
OUTPUT DOES
NOT ASSERT
OUTPUT ASSERTS
0.950
0.975
1.025
1.000
1.050
-40 0-20 20 40 60 80
NORMALIZED UPPER AND LOWER
TRIP VOLTAGES vs. TEMPERATURE
MAX6427 toc04
TEMPERATURE (°C)
NORMALIZED TRIP VOLTAGES (V)
LOWER TRIP VOLTAGE
UPPER TRIP VOLTAGE
0
100
50
200
150
250
300
010
MAX6427 toc05
I
SINK
(mA)
4268
LBO OUTPUT vs. I
SINK
LBO OUTPUT (mV)
OPEN-DRAIN LBO
ASSERTED
MAX6427–MAX6438
Low-Power, Single/Dual-Level Battery Monitors
with Hysteresis
_______________________________________________________________________________________ 5
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX6427–MAX6438
Low-Power, Single/Dual-Level Battery Monitors
with Hysteresis
6 _______________________________________________________________________________________
Pin Description
PIN
M AX6427/
M AX6428/
M AX6429
M AX6430/
M AX6431/
M AX6432
M AX6433/
M AX6434/
M AX6435
M AX6436/
M AX6437/
M AX6438
NAME FUNCTION
1 — 4 —
LBO/
LBO
Low-Battery Output. LBO/LBO is asserted when BATT drops
below V
LTH
(MAX6427/MAX6428/MAX6429) or when LTHIN
(MAX6433/MAX6434/MAX6435) drops below V
LTHIN
, and
remains asserted for at least 140ms after BATT exceeds V
HTH
(MAX6427/MAX6428/MAX6429) or V
HTHIN
(MAX6433/
MAX6434/MAX6435).
23——BATT
Battery-Voltage Input. Input for battery-voltage threshold
monitors and device power supply for factory-trimmed
threshold versions.
3 1 2 2 GND Ground
— 2 — 5
LBOH/
LBOH
Low-Battery Output High. LBOH/LBOH is asserted when BATT
drops below V
HTH-
(MAX6430/MAX6431/MAX6432) or when
HTHIN drops below V
HTHIN-
(MAX6436/MAX6437/ MAX6438). It
remains asserted for at least 140ms after BATT exceeds V
HTH+
(MAX6430/MAX6431/MAX6432) or HTHIN rises above V
HTHIN+
(MAX6436/MAX6437/MAX6438).
— 4 — 4
LBOL/
LBOL
Low-Battery Output Low. LBOL/LBOL is asserted when BATT
drops below V
LTH-
(MAX6430/MAX6431/MAX6432) or when
LTHIN drops below V
LTHIN-
(MAX6436/MAX6437/
MAX6438). It remains asserted for at least 140ms after BATT
exceeds V
LTH+
(MAX6430/MAX6431/MAX6432) or LTHIN rises
above V
LTHIN+
(MAX6436/MAX6437/MAX6438).
—— 1 1 HTHIN
HTH Threshold Monitor Input. A resistor-divider network sets
the high threshold associated with LBOH/LBOH.
—— 3 3 LTHIN
LTH Threshold Monitor Input. A resistor-divider network sets
the low threshold associated with LBOL/LBOL.
—— 56V
DD
VDD Supply Voltage Input. Device power supply for adjustable
threshold versions.
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