MAX6439UTBISD3+T [MAXIM]
Power Supply Support Circuit, Fixed, 2 Channel, BICMOS, PDSO6, SOT-23, 6 PIN;
| 型号： | MAX6439UTBISD3+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 2 Channel, BICMOS, PDSO6, SOT-23, 6 PIN 信息通信管理 光电二极管 |
| 文件： | 总14页 (文件大小：250K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2535; Rev 1; 12/05
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
Note: The first two “_ _” are placeholders for the battery moni-
(V ) from 1.8V to 3.3V with seven fixed reset threshold
CC
tor voltage levels. Desired threshold levels are set by the part
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.
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.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Applications
Pin Configurations
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.
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
ABSOLUTE MAXIMUM RATINGS
BATT CC
Open-Drain LBO, LBOH, LBOL, LBOLH to GND ...-0.3V to +6V*
Open-Drain RESET to GND ....................................-0.3V to +6V*
Push-Pull RESET to GND............................-0.3V to (V
MR to GND .................................................-0.3V to (V
V
, V
to GND.................................................-0.3V to +6V*
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
+ 0.3V)
+ 0.3V)
CC
CC
Input/Output Current, All Pins .............................................20mA
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW
8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW
*Applying 7V for a duration of 1ms does not damage the device.
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.
ELECTRICAL CHARACTERISTICS
(V
BATT
= 1.2V to 5.5V, V = 1.2V to 5.5V, T = -40°C to +85°C, unless otherwise specified. Typical values are at T = +25°C.) (Note1)
CC
A
A
PARAMETER
Operating Voltage Range
SYMBOL
CONDITIONS
= 0°C to +85°C
MIN
1.0
1.2
1.0
1.2
TYP
MAX
5.5
5.5
5.5
5.5
7
UNITS
T
T
T
T
A
A
A
A
V
V
V
BATT
BATT
= -40°C to +85°C
= 0°C to +85°C
= -40°C to +85°C
V
V
Operating Voltage Range
V
V
CC
CC
CC
+ V
Supply Current
I
+ I
V
= 3.6V, V = 3.3V, no load (Note 2)
CC
2.5
µA
BATT
CC
BATT
BATT
V
BATT
THRESHOLDS
MAX6439UT_ J, MAX6440UT_ J
MAX6439UT_ I, MAX6440UT_ I
MAX6439UT_ H, MAX6440UT_ H
MAX6439UT_ G, MAX6440UT_ G
MAX6439UT_ T, MAX6440UT_ T
MAX6439UT_ S, MAX6440UT_ S
MAX6439UT_ R, MAX6440UT_ R
MAX6439UT_ Q, MAX6440UT_ Q
MAX6439UTF, MAX6440UTF
MAX6439UTE, MAX6440UTE
MAX6439UTD, MAX6440UTD
MAX6439UTC, MAX6440UTC
MAX6439UTB, MAX6440UTB
MAX6439UTA, MAX6440UTA
MAX6439UTP, MAX6440UTP
MAX6439UTO, MAX6440UTO
MAX6439UTN, MAX6440UTN
MAX6439UTM, MAX6440UTM
MAX6439UTL, MAX6440UTL
MAX6439UTK, MAX6440UTK
3.510
3.413
3.315
3.218
2.535
2.438
2.340
2.243
3.023
2.925
2.828
2.730
2.633
2.535
2.048
1.950
1.853
1.755
1.658
1.560
3.60
3.50
3.40
3.30
2.60
2.50
2.40
2.30
3.10
3.00
2.90
2.80
2.70
2.60
2.10
2.00
1.90
1.80
1.70
1.60
3.690
3.588
3.485
3.383
2.665
2.563
2.460
2.358
3.178
3.075
2.973
2.870
2.768
2.665
2.153
2.050
1.948
1.845
1.743
1.640
HTH Threshold
HTH
V
LTH Threshold
LTH
V
2
_______________________________________________________________________________________
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 1.2V to 5.5V, V = 1.2V to 5.5V, T = -40°C to +85°C, unless otherwise specified. Typical values are at T = +25°C.) (Note1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MAX6441UT_ J, MAX6442UT_ J
MAX6441UT_ I, MAX6442UT_ I
MAX6441UT_ H, MAX6442UT_ H
MAX6441UT_ G, MAX6442UT_ G
MAX6441UT_ T, MAX6442UT_ T
MAX6441UT_ S, MAX6442UT_ S
MAX6441UT_ R, MAX6442UT_ R
MAX6441UT_ Q, MAX6442UT_ Q
MAX6441UT_ J, MAX6442UT_ J
MAX6441UT_ I, MAX6442UT_ I
MAX6441UT_ H, MAX6442UT_ H
MAX6441UT_ G, MAX6442UT_ G
MAX6441UT_ T, MAX6442UT_ T
MAX6441UT_ S, MAX6442UT_ S
MAX6441UT_ R, MAX6442UT_ R
MAX6441UT_ Q, MAX6442UT_ Q
MAX6441UTF, MAX6442UTF
MAX6441UTE, MAX6442UTE
MAX6441UTD, MAX6442UTD
MAX6441UTC, MAX6442UTC
MAX6441UTB, MAX6442UTB
MAX6441UTA, MAX6442UTA
MAX6441UTP, MAX6442UTP
MAX6441UTO, MAX6442UTO
MAX6441UTN, MAX6442UTN
MAX6441UTM, MAX6442UTM
MAX6441UTL, MAX6442UTL
MAX6441UTK, MAX6442UTK
MAX6441UTF, MAX6442UTF
MAX6441UTE, MAX6442UTE
MAX6441UTD, MAX6442UTD
MAX6441UTC, MAX6442UTC
MAX6441UTB, MAX6442UTB
MAX6441UTA, MAX6442UTA
MAX6441UTP, MAX6442UTP
MAX6441UTO, MAX6442UTO
MAX6441UTN, MAX6442UTN
MAX6441UTM, MAX6442UTM
MAX6441UTL, MAX6442UTL
MAX6441UTK, MAX6442UTK
MIN
TYP
MAX
3.690
3.588
3.485
3.383
2.665
2.563
2.460
2.358
3.875
3.767
3.659
3.552
2.798
2.691
2.583
2.476
3.178
3.075
2.973
2.870
2.768
2.665
2.153
2.050
1.948
1.845
1.743
1.640
3.337
3.229
3.121
3.014
2.906
2.798
2.260
2.153
2.045
1.937
1.830
1.722
UNITS
3.510
3.413
3.315
3.218
2.535
2.438
2.340
2.243
3.686
3.583
3.481
3.378
2.662
2.559
2.457
2.355
3.023
2.925
2.828
2.730
2.633
2.535
2.048
1.950
1.853
1.755
1.658
1.560
3.174
3.071
2.969
2.867
2.764
2.662
2.150
2.048
1.945
1.843
1.740
1.638
3.600
3.500
3.400
3.300
2.600
2.500
2.400
2.300
3.780
3.675
3.570
3.465
2.730
2.625
2.520
2.415
3.100
3.000
2.900
2.800
2.700
2.600
2.100
2.000
1.900
1.800
1.700
1.600
3.255
3.150
3.045
2.940
2.835
2.730
2.205
2.100
1.995
1.890
1.785
1.680
HTH- Threshold
HTH-
V
HTH+ Threshold
HTH+
V
LTH- Threshold
LTH-
V
LTH+ Threshold
LTH+
V
_______________________________________________________________________________________
3
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 1.2V to 5.5V, V = 1.2V to 5.5V, T = -40°C to +85°C, unless otherwise specified. Typical values are at T = +25°C.) (Note1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LBO, LBOL, LBOH, LBOLH
Timeout Period
t
V
V
rising above threshold
150
225
300
ms
LBOP
BATT
BATT
LBO, LBOL, LBOH, LBOLH
Delay Time
t
falling below threshold
100
µs
V
LBOD
(V
or V ) ≥ 1.2V, I
= 50µA,
BATT
CC
SINK
SINK
SINK
SINK
0.3
0.3
0.3
0.3
asserted low
(V or V ) ≥ 1.6V, I
asserted low
= 100µA,
= 1.2mA,
= 3.2mA,
BATT
CC
LBO, LBOL, LBOH, LBOLH
Output Low
(Open Drain)
V
OL
(V or V ) ≥ 2.7V, I
asserted low
BATT
CC
(V or V ) ≥ 4.5V, I
asserted low
BATT
CC
LBO, LBOL, LBOH, LBOLH
Output Open-Drain Leakage
Current
I
Output deasserted
500
nA
LKG
MAX64_ _ _ _ _ _ T
MAX64_ _ _ _ _ _ S
MAX64_ _ _ _ _ _ R
MAX64_ _ _ _ _ _ Z
MAX64_ _ _ _ _ _ Y
MAX64_ _ _ _ _ _ W
MAX64_ _ _ _ _ _ V
3.000
2.850
2.550
2.250
2.125
1.620
1.530
3.075
2.925
2.625
2.313
2.188
1.665
1.575
0.3
3.150
3.000
2.700
2.375
2.250
1.710
1.620
V
Reset Threshold
V
V
CC
TH
V
V
Reset Hysteresis
%
CC
CC
V
falling at 10mV/µs from (V + 100mV)
TH
CC
to RESET Delay
50
µs
to (V - 100mV)
TH
MAX64_ _ _ _ _ _ _ D3
MAX64_ _ _ _ _ _ _ D7
150
225
300
V
to RESET Timeout Period
t
ms
V
CC
RP
1200
1800
2400
V
0.3 x V
CC
IL
MR Input Voltage
V
0.7 x V
1
IH
CC
MR Minimum Pulse Width
MR Glitch Rejection
t
µs
ns
ns
ms
Ω
MPW
100
200
225
1500
225
MR to RESET Delay
MR Reset Timeout Period
MR Pullup Resistance
MR Rising Debounce Period
t
150
750
150
300
2250
300
MRP
MR to V
CC
t
(Note 3)
ms
DEB
4
_______________________________________________________________________________________
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 1.2V to 5.5V, V = 1.2V to 5.5V, T = -40°C to +85°C, unless otherwise specified. Typical values are at T = +25°C.) (Note1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
≥ 1.53V, I
= 100µA, RESET
CC
SOURCE
0.8 x V
CC
CC
deasserted
RESET Output High
(Push-Pull)
V
V
OH
V
≥ 2.55V, I
= 500µA, RESET
CC
SOURCE
0.8 x V
deasserted
V
V
V
≥ 1.0V, I
≥ 1.2V, I
= 50µA, RESET asserted
= 100µA, RESET asserted
0.3
0.3
CC
CC
SINK
SINK
RESET Output Low
V
V
OL
≥ 2.12V, I
= 1.2mA, RESET
CC
SINK
0.3
asserted
RESET Output Leakage Current
(Open Drain)
RESET deasserted
500
nA
Note 1: Production testing done at T = +25°C; limits over temperature guaranteed by design only.
A
Note 2: The device is powered up by the highest voltage between V
and V
.
BATT
CC
Note 3: MR input ignores falling input pulses, which occur within the MR debounce period (t ) after a valid MR reset assertion.
DEB
This prevents invalid reset assertion due to switch bounce.
Typical Operating Characteristics
(V
= 1.2V to 5.5V, V
= 1.2V to 5.5V, unless otherwise specified. Typical values are at T = +25°C.)
BATT
CC
A
SUPPLY CURRENT vs. TEMPERATURE
= 3.3V, V = 3.6V
NORMALIZED LBO TIMEOUT PERIOD
vs. TEMPERATURE
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
V
CC
BATT
4
3
2
1
0
1.10
1.05
1.00
0.95
0.90
1.015
1.010
1.005
1.000
0.995
0.990
TOTAL
I
BATT
I
CC
0.985
0.980
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
Typical Operating Characteristics (continued)
(V
= 1.2V to 5.5V, V
= 1.2V to 5.5V, unless otherwise specified. Typical values are at T = +25°C.)
BATT
C
C
A
MAXIMUM V
TRANSIENT DURATION
MAXIMUM V TRANSIENT DURATION
CC
NORMALIZED UPPER (HTH) AND LOWER
(LTH) TRIP VOLTAGES vs. TEMPERATURE
BATT
vs. LTH THRESHOLD OVERDRIVE
vs. V THRESHOLD OVERDRIVE
TH
1.050
1.025
1.000
0.975
0.950
120
110
60
55
50
45
40
35
30
25
20
LBO ASSERTS ABOVE
THIS LINE
RESET ASSERTS ABOVE
THIS LINE
100
90
LOWER TRIP VOLTAGE
UPPER TRIP VOLTAGE
80
70
60
10
100
1000
10
100
1000
-40
-20
0
20
40
60
80
LTH THRESHOLD OVERDRIVE (mV)
V
THRESHOLD OVERDRIVE (mV)
TEMPERATURE (°C)
TH
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
LBO OUTPUT vs. SINK CURRENT
V
CC
= 3.3V, V
= 2.1V
BATT
1.050
1.025
1.000
0.975
0.950
120
100
80
60
40
20
0
LBO ASSERTED
8 10
-40
-20
0
20
40
60
80
0
2
4
6
TEMPERATURE (°C)
I
(mA)
SINK
RESET OUTPUT vs. SINK CURRENT
RESET OUTPUT vs. SOURCE CURRENT
= 3.3V, V = 3.6V
V
CC
= 2.1V, V
= 3.6V
V
CC
BATT
BATT
140
120
100
80
3.50
3.25
3.00
2.75
2.50
60
40
RESET ASSERTED
20
0
0
2
4
6
8
10
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
(mA)
I
(mA)
I
SOURCE
SINK
6
_______________________________________________________________________________________
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
Pin Description
PIN
NAME
FUNCTION
MAX6439/ MAX6441/
MAX6440
MAX6442
Battery Voltage Input. Input for battery voltage threshold monitors and device power supply
1
1
V
BATT
if V
is greater than V
.
CC
BATT
Manual Reset Input, Active-Low, Internal 1.5kΩ Pullup to V . Pull low to assert a one-shot
CC
edge-triggered RESET output for the MR reset timeout period. Leave unconnected or
2
3
3
MR
connect to V
if unused. The MR input is debounced for MR rising edges to prevent false
CC
reset events.
Low-Battery Output, Active Low, Open Drain. LBO is asserted when V
drops below the
BATT
LTH specification and remains asserted until V
least 150ms.
rises above the HTH specification for at
—
LBO
BATT
Reset Output, Active Low, Push-Pull or Open Drain. RESET changes from high to low when
the V input drops below the selected reset threshold and remains low for the V reset
CC
CC
timeout period after V
exceeds the reset threshold. RESET is one-shot edge-trigger
CC
4
5
RESET
pulsed low for the MR reset timeout period when the MR input is pulled low. RESET is an
open-drain output for the MAX6439/MAX6441, and a push-pull output for the
MAX6440/MAX6442. The push-pull outputs are referenced to V . RESET is guaranteed to
CC
be in the correct logic state for V
or V
> 1.0V.
CC
BATT
5
6
2
8
GND
Ground
V
Voltage Input. Input for V
reset threshold monitor and device power supply if V
is
CC
CC
CC
V
CC
greater than V
.
BATT
Low-Battery Output High, Active Low, Open Drain. LBOH is asserted when V
drops
BATT
below the HTH- specification. LBOH is deasserted when V
specification for at least 150ms.
rises above the HTH+
—
—
—
6
7
4
LBOH
LBOL
BATT
Low-Battery Output Low, Active Low, Open Drain. LBOL is asserted when V
drops
BATT
below the LTH- specification. LBOL is deasserted when V
rises above the LTH+
BATT
specification for at least 150ms.
Low-Battery Output Low/High, Active Low, Open Drain. LBOLH is asserted when V
LBOLH drops below the LTH- specification. LBOLH is deasserted when V
BATT
rises above the
BATT
HTH+ specification for at least 150ms.
monitor separate high-voltage and low-voltage thresh-
olds to determine battery status. The output(s) can be
used to signal when the battery is charged, when the
battery is low, and when the battery is empty. Factory-
trimmed thresholds are ideal for monitoring single-cell
Li+ or multicell alkaline/NiCd/NiMH power supplies.
Detailed Description
The MAX6439–MAX6442 family is available with several
monitoring options. The factory-trimmed thresholds
eliminate the requirement for external components. The
MAX6439/MAX6440 have single low-battery outputs
and the MAX6441/MAX6442 have dual low-battery out-
puts (see Figure 1a and Figure 1b).
When the power-supply voltage drops below the speci-
fied low threshold, the low-battery output asserts. When
the voltage rises above the specified high threshold fol-
lowing a 150ms (min) timeout period, the low-battery
output is deasserted. This ensures the supply voltage
The MAX6439–MAX6442 combine a 1.23V reference
with two comparators, logic, and timing circuitry to pro-
vide the user with information about the charge state of
the power-supply batteries. The MAX6441/MAX6442
_______________________________________________________________________________________
7
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
V
BATT
MAX6441
V
BATT
MAX6440
LTH
DETECT
LBOL
5%
HYST
LTH
DETECT
LBO
TIMEOUT
PERIOD
R
S
Q
Q
LBOH
LBO
HTH
DETECT
LBO TIMEOUT
PERIOD
HTH
DETECT
5%
HYST
LBOLH
1.23V
V
CC
V
CC
1.23V
V
CC
RESET
TIMEOUT
PERIOD
V
TH
DETECT
RESET
RESET
RESET
TIMEOUT
PERIOD
V
TH
DETECT
V
CC
MR
V
CC
MR
Figure 1a. Functional Diagram
Figure 1b. Functional Diagram
has stabilized before power-converter or microproces-
sor activity is enabled.
low-battery outputs: LBOH, LBOL, and LBOLH. LBOH
asserts when V
drops below V
and remains
rises above
BATT
HTH-
BATT
drops below V
asserted for at least 150ms after V
. LBOL asserts when V
These devices also have an independent µP supervisor
V
HTH+
BATT
LTH-
BATT
drops
that monitors V
and provides an active-low reset out-
CC
and remains asserted for at least 150ms after V
put. A manual reset function is available to allow the
user to reset the µP with a push-button.
rises above V
. LBOLH asserts when V
LTH+
BATT
below V
and remains asserted for at least 150ms
LTH-
BATT
BATT
Low-Battery Output
The low-battery outputs are available in active-low
(LBO, LBOL, LBOH, LBOLH), open-drain configura-
tions. The low-battery outputs can be pulled to a volt-
after V
rises above V
(see Figure 3). For fast-
HTH+
rising V
input, the LBOL timeout period must com-
plete before the LBOH/LBOLH timeout period begins.
Reset Output
The MAX6439–MAX6442 provide an active-low reset
output (RESET). RESET is asserted when the voltage at
age independent of V
or V
, up to 5.5V. This
BATT
CC
allows the device to monitor and operate from direct
battery voltage while interfacing to higher voltage
microprocessors.
V
falls below the reset threshold level. Reset remains
CC
asserted for the reset timeout period after V
exceeds
CC
The MAX6439/MAX6440 single-output voltage monitors
provide a single low-battery output, LBO. These fixed-
the threshold. If V
goes below the reset threshold
CC
before the reset timeout period is completed, the inter-
nal timer restarts. The MAX6439/MAX6441 have open-
drain reset outputs, while the MAX6440/MAX6442 have
push-pull reset outputs (see Figure 4).
threshold devices assert LBO when V
drops below
BATT
V
V
and remain asserted for at least 150ms after
LTH
BATT
rises above V
(see Figure 2). The MAX6441/
HTH
MAX6442 triple-output voltage monitors provide three
8
_______________________________________________________________________________________
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
V
BATT
HTH
LTH
t
t
t
LBOP
LBOP
LBOD
LBO
Figure 2. Single Low-Battery Output Timing
V
BATT
HTH+
HTH-
LTH+
LTH-
t
D
LBOL
t
t
LBOP
LBOP
t
t
LBOP
D
LBOH
t
LBOP
LBOLH
Figure 3. Dual Low-Battery Output Timing
V
CC
V
TH
GND
MR
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
GND
RESET
GND
t
RP
t
t
MRP
MRP
t
t
DEB
DEB
t
t
MPW
MPW
Figure 4. RESET Timing Diagram
_______________________________________________________________________________________
9
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
CURRENT-
DC/DC CONVERTER
LIMITED
AC WALL
ADAPTER
V
HTH
IN
SHDN
V
HYST
LED
V
OUT
BATT
GATE
BATT
IN
V
LTH
V
CC
V
CHG
BATT
LBOL
1-CELL
Li+
BATTERY
t
MAX6441
MAX6442
LBOP
MAX1879
PULSE-WIDTH
SELECT INPUT
TSEL
GND
LBOH
LBO
LBOLH
RESET
THERM
ADJ
HTH = BATTERY VOLTAGE GOOD, ENABLE OPERATION.
LTH = BATTERY VOLTAGE LOW, SUSPEND/DISABLE OPERATION.
GND
THERMISTOR
Figure 5. Hysteresis
Figure 6. Li+ Charger Application (Using MAX1879)
logic levels, open-drain/open-collector outputs, or a
momentary push-button switch to GND (the MR function
IN
OUT
is internally debounced for the t
timeout period) to
DEB
DC/DC
SHDN
create a manual reset function. If MR is driven from long
cables, or if the device is used in a noisy environment,
connect a 0.1µF capacitor from MR to GND to provide
additional noise immunity (see Figure 4).
Li+
3.6V
V
CC
LBOL
V
CC
V
BATT
LBOH
NMI
Hysteresis
Hysteresis increases the comparator’s noise margin by
increasing the upper threshold or decreasing the lower
threshold. The hysteresis prevents the output from
MAX6441
MAX6442
µP
MR
oscillating (chattering) when V
is near the low-bat-
BATT
RESET
RESET
tery threshold. This is especially important for applica-
tions where the load on the battery creates significant
fluctuations in battery voltages (see Figure 5).
GND
GND
Applications Information
Li+ Battery Charger Application
The MAX6441/MAX6442 dual-output battery monitors
can be used in conjunction with a battery charger to
provide a system with additional information about the
battery charge state. Many battery chargers, such as
the MAX1879, provide the user with a CHG output,
which tells the system when the battery is charged. The
MAX6441/MAX6442 dual-output battery monitors pro-
vide three outputs, which can be used to relay the bat-
tery condition to the system. This information is useful in
determining which system resources can be powered by
the battery at the current charge state (see Figure 6).
Figure 7. DC-to-DC Converter Application
Manual Reset
Many microprocessor-based products require manual
reset capability, allowing the operator, a test technician,
or external logic circuitry to initiate a reset while the
monitored supplies remain above their reset thresholds.
These devices have a dedicated active-low MR pin.
When MR is pulled low, RESET asserts a one-shot low
pulse for the MR reset timeout period. The MR input has
an internal 1.5kΩ pullup resistor to V
unconnected if not used. MR can be driven with CMOS-
and can be left
CC
10 ______________________________________________________________________________________
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
Table 1. Factory-Trimmed Lower and Upper Threshold Combinations for Single-Cell Li+
or Three-Cell Alkaline/NiCd/NiMH Applications
UPPER THRESHOLD (HTH)
VOLTAGES
3.3V
AG
BG
CG
DG
EG
FG
3.4V
AH
BH
CH
DH
EH
3.5V
AI
3.6V
AJ
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
LOWER
THRESHOLD
(LTH)
BI
BJ
CI
DI
EI
CJ
DJ
EJ
FH
FI
FJ
Table 2. Factory-Trimmed Lower and Upper Threshold Combinations for Two-Cell
Alkaline/NiCd/NiMH Applications
UPPER THRESHOLD (HTH)
VOLTAGES
2.3V
KQ
LQ
2.4V
KR
LR
2.5V
KS
2.6V
KT
1.6V
1.7V
1.8V
1.9V
2.0V
2.1V
LOWER
THRESHOLD
(LTH)
LS
LT
MQ
NQ
OQ
PQ
MR
NR
OR
PR
MS
NS
OS
PS
MT
NT
OT
PT
Table 3. Factory-Trimmed V
Threshold Levels
Reset
Table 4. V
Guide
Reset Timeout Period Suffix
CC
CC
ACTIVE TIMEOUT PERIOD (ms)
PART NO.
SUFFIX
( _ )
V
NOMINAL
RESET
CC
TIMEOUT
PERIOD SUFFIX
MIN
150
MAX
300
THRESHOLD (V)
D3
D7
T
S
3.075
2.925
2.625
2.313
2.188
1.665
1.575
1200
2400
R
Z
Y
W
V
DC-to-DC Converter Application
The MAX6441/MAX6442 triple-output battery monitors
can be used in conjunction with a DC-to-DC converter
to power microprocessor systems using a single Li+
cell or two to three alkaline/NiCd/NiMH cells. The LBOH
output indicates that the battery voltage is weak, and is
used to warn the microprocessor of potential problems.
Armed with this information, the microprocessor can
reduce system power consumption. The LBOL output
indicates the battery is empty, and system power
should be disabled. By connecting LBOL to the SHDN
pin of the DC-to-DC converter, power to the microproces-
sor is removed. Microprocessor power does not return
until the battery has recharged to a voltage greater than
V
(see Figure 7).
LTH+
______________________________________________________________________________________ 11
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
Selector Guide
OPEN-DRAIN
SINGLE LOW-
BATTERY OUTPUT
DUAL LOW-BATTERY
OUTPUT
PART
PUSH-PULL RESET
RESET
MAX6439
MAX6440
MAX6441
MAX6442
X
—
X
—
X
X
X
—
—
X
—
X
—
—
—
X
Typical Application Circuit
Standard Versions Table
PART
TOP MARK
ABMN
ABMO
ABMP
ABMQ
ABMR
ABMS
ABMT
ABMU
ABMV
ABMW
ABMX
ABMY
AEEI
DC/DC
MAX6439UTDHRD3
MAX6439UTDHSD3
MAX6439UTEHRD3
MAX6439UTEHSD3
MAX6439UTEIRD3
MAX6439UTEISD3
MAX6440UTDHRD3
MAX6440UTDHSD3
MAX6440UTEHRD3
MAX6440UTEHSD3
MAX6440UTEIRD3
MAX6440UTEISD3
MAX6441KADHRD3
MAX6441KADHSD3
MAX6441KAEHRD3
MAX6441KAEHSD3
MAX6441KAEIRD3
MAX6441KAEISD3
MAX6442KADHRD3
MAX6442KADHSD3
MAX6442KAEHRD3
MAX6442KAEHSD3
MAX6442KAEIRD3
MAX6442KAEISD3
Li+
3.6V
V
CC
V
CC
LBO
MR
NMI
µP
MAX6439
MAX6440
V
RESET
BATT
RESET
GND
GND
Pin Configurations (continued)
AEEJ
AEEK
AEEL
TOP VIEW
AEEM
AEEN
AEEO
AEEP
V
V
1
2
3
4
8
7
6
5
CC
BATT
GND
MR
LBOL
LBOH
RESET
MAX6441
MAX6442
AEEQ
AEER
AEES
LBOLH
SOT23-8
AEET
Chip Information
TRANSISTOR COUNT: 1478
PROCESS: BiCMOS
12 ______________________________________________________________________________________
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, SOT 6L BODY
1
21-0058
G
1
______________________________________________________________________________________ 13
Low-Power, Single-/Dual-Level Battery Monitors
with Hysteresis and Integrated µP Reset
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
SEE DETAIL "A"
SYMBOL
MIN
MAX
e
b
A
0.90
0.00
0.90
0.28
0.09
2.80
2.60
1.50
0.30
1.45
0.15
1.30
0.45
0.20
3.00
3.00
1.75
0.60
C
L
A1
A2
b
C
D
E
C
C
L
E1
L
E
E1
L
0.25 BSC.
L2
e
PIN 1
I.D. DOT
(SEE NOTE 6)
0.65 BSC.
1.95 REF.
0∞
e1
0
8∞
e1
D
C
C
L
L2
A2
A
GAUGE PLANE
A1
SEATING PLANE
C
0
L
NOTE:
1. ALL DIMENSIONS ARE IN MILLIMETERS.
2. FOOT LENGTH MEASURED FROM LEAD TIP TO UPPER RADIUS OF
HEEL OF THE LEAD PARALLEL TO SEATING PLANE C.
DETAIL "A"
3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH & METAL BURR.
4. PACKAGE OUTLINE INCLUSIVE OF SOLDER PLATING.
5. COPLANARITY 4 MILS. MAX.
6. PIN 1 I.D. DOT IS 0.3 MM ÿ MIN. LOCATED ABOVE PIN 1.
PROPRIETARY INFORMATION
TITLE:
7. SOLDER THICKNESS MEASURED AT FLAT SECTION OF LEAD
BETWEEN 0.08mm AND 0.15mm FROM LEAD TIP.
PACKAGE OUTLINE, SOT-23, 8L BODY
8. MEETS JEDEC MO178.
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0078
D
1
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
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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