General Description
The MAX6775MAX6781 low-power, 1%-accurate bat-
tery monitors are available in the ultra-small DFN
package (1.0mm x 1.5mm) and SC70 packages. These
low-power devices are ideal for monitoring single lithi-
um-ion (Li+) cells, or multicell alkaline/NiCd/NiMH
power sources. These devices offer single (MAX6775/
MAX6776/MAX6777/MAX6778) or dual (MAX6779/
MAX6780/MAX6781) low-battery outputs and feature
fixed or resistor-adjustable hysteresis. Hysteresis elimi-
nates the output chatter sometimes associated with bat-
tery voltage monitors, usually due to input-voltage noise
or battery terminal voltage recovery after load removal.
These devices are available in several versions: with
single- or dual-voltage monitors, and with fixed or
adjustable hysteresis. The MAX6775/MAX6776 offer a
single battery monitor and factory-set hysteresis of
0.5%, 5%, or 10%. The MAX6779/MAX6780/MAX6781
have two battery monitors in a single package and fac-
tory-set hysteresis of 0.5%, 5%, or 10%. The MAX6777/
MAX6778 offer a single battery monitor with external
inputs for the rising and falling thresholds, allowing
external hysteresis control.
For convenient interface with system power circuitry or
microprocessors, both open-drain and push-pull out-
puts are available. The single-channel devices are
available with open-drain or push-pull outputs. The
dual-channel devices are available with both outputs
open-drain, both outputs push-pull, or one of each
(see the Selector Guide). This family of devices is
offered in small 5-pin SC70 and ultra-small 6-pin DFN
packages, and is fully specified over the -40C to
+85C extended temperature range.
Applications
Battery-Powered Systems (Single-Cell Li+ or
Multicell NiMH, NiCd, Alkaline)
Cell Phones/Cordless Phones
Pagers
Portable Medical Devices
PDAs
Electronic Toys
MP3 Players
Features
1.0%-Accurate Threshold Specified Over
Temperature
Single/Dual, Low-Battery Output Options
Low 3A Battery Current
Open-Drain or Push-Pull Low-Battery Outputs
Fixed or Adjustable Hysteresis
Low-Input Leakage Current Allows Use of Large
Resistors
Guaranteed Valid Low-Battery-Output Logic State
Down to V
BATT
= 1V
Immune to Short Battery Transients
Fully Specified from -40C to +85C
Small 5-Pin SC70 or Ultra-Small 6-Pin DFN
(1mm x 1.5mm) Package
MAX6775MAX6781
Low-Power, 1%-Accurate Battery
Monitor in DFN and SC70 Packages
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
LBI
3.6V
LBO
BATT
MAX6775
SHDN
OUT
DC-DC
CONVERTER
IN
Typical Operating Circuit
19-3774; Rev 0; 8/05
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 continued at end of data sheet.
+Denotes lead-free package.
*Future product--contact factory for availability.
MAX6775/MAX6776/MAX6779/MAX6780/MAX6781 are available
with factory-trimmed hysteresis. Specify trim by replacing "_"
with "A" for 0.5%, "B" for 5%, or "C" for 10% hysteresis.
Pin Configurations appear at end of data sheet.
PART
TEMP RANGE
PIN-PACKAGE
MAX6775XK_+T
-40C to +85C
5 SC70-5
MAX6775LT_+T*
-40C to +85C
6 DFN-6
MAX6776XK_+T*
-40C to +85C
5 SC70-5
MAX6776LT_+T*
-40C to +85C
6 DFN-6
MAX6777XK+T
-40C to +85C
5 SC70-5
MAX6777LT+T*
-40C to +85C
6 DFN-6
MAX6775MAX6781
Low-Power, 1%-Accurate Battery
Monitor in DFN and SC70 Packages
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
BATT
= 1.6V to 5.5V, T
A
= -40C to +85C, unless otherwise specified. Typical values are at T
A
= +25C.) (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 to GND............................................................-0.3V to +6V
LBI, LBL, LBH, LBI1, LBI2 to GND ...............-0.3V to minimum of
((V
BATT
+ 0.3V) and +6V)
LBO, LBO1, LBO2 to GND (open-drain) .................-0.3V to +6V
LBO, LBO1, LBO2 to GND (push-pull).........-0.3V to minimum of
((V
BATT
+ 0.3V) and +6V)
Input Current (all pins) ........................................................20mA
Output Current (all pins) .....................................................20mA
Continuous Power Dissipation (T
A
= +70C)
5-Pin SC70 (derate 3.1mW/C above +70C) ..............247mW
6-Pin DFN (derate 2.1mWC above +70C) ..............168mW
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= 0C to +70C
1.0
5.5
Operating Voltage Range
(Note 2)
V
BATT
T
A
= -40C to +85C
1.2
5.5
V
V
BATT
= 3.7V, no load
4
7
Supply Current
I
Q
V
BATT
= 1.8V, no load
3.2
6
A
FIXED HYSTERESIS (MAX6775/MAX6776/MAX6779/MAX6780/MAX6781)
0.5% hysteresis version
1.2037
1.2159
1.2280
5% hysteresis version
1.1493
1.1609
1.1725
LBI, LBI_ Falling Threshold
(Note 3)
V
LBIF
10% hysteresis version
1.0888
1.0998
1.1108
V
LBI Rising Threshold
V
LBIR
1.2098
1.222
1.2342
V
LBI Input Leakage Current
0.2V
V
LBI
V
BATT
- 0.2V
-5
+5
nA
ADJUSTABLE HYSTERESIS (MAX6777/MAX6778)
LBL, LBH Threshold
V
BATT
= 1.8V to 5.5V
1.2098
1.222
1.2342
V
LBL, LBH Input Leakage Current
V
BATT
- 0.2V
V
LBL/LBH
0.2V
-5
+5
nA
MAX6775MAX6781
Low-Power, 1%-Accurate Battery
Monitor in DFN and SC70 Packages
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 1.6V to 5.5V, T
A
= -40C to +85C, unless otherwise specified. Typical values are at T
A
= +25C.) (Note 1)
Note 1: Devices are tested at T
A
= +25C and guaranteed by design for T
A
= T
MIN
to T
MAX
, as specified.
Note 2: Operating range ensures low-battery output is in the correct state. Minimum battery voltage for electrical specification is 1.6V.
Note 3: The rising threshold is guaranteed to be higher than the falling threshold.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOW-BATTERY OUTPUTS (LBO, LBO1, LBO2)
Propagation Delay
t
PD
V
LBI_
+ 100mV to V
LBI_
- 100mV
9
s
Startup Time
V
BATT
rising above 1.6V
3
ms
V
BATT
1.2V, I
SINK
= 100A
0.3
V
BATT
2.7V, I
SINK
= 1.2mA
0.3
Output Low (Push-Pull or
Open-Drain)
V
OL
V
BATT
4.5V, I
SINK
= 3.2mA
0.3
V
V
BATT
1.6V, I
SOURCE
= 100A
0.8 x
V
BATT
V
BATT
2.7V, I
SOURCE
= 500A
0.8 x
V
BATT
Output High (Push-Pull )
V
OH
V
BATT
4.5V, I
SOURCE
= 800A
0.8 x
V
BATT
V
Output Leakage Current
(Open-Drain)
Output not asserted, V
LBO_
= 5.5V
-100
+100
nA
Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX6775 toc01
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
60
35
10
-15
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.5
-40
85
V
BATT
= 5V
V
BATT
= 3.6V
V
BATT
= 3V
V
BATT
= 2.4V
V
BATT
= 1.6V
PROPAGATION DELAY
vs. TEMPERATURE
MAX6775 toc02
TEMPERATURE (
C)
PROPAGATION DELAY (
s)
60
35
10
-15
8
9
10
11
12
7
-40
85
V
BATT
= 5V
100mV OVERDRIVE
V
BATT
= 1.6V
MAXIMUM TRANSIENT DURATION
vs. THRESHOLD OVERDRIVE
MAX6775 toc03
THRESHOLD OVERDRIVE V
TH
- V
CC
(mV)
MAXIMUM TRANSIENT DURATION (
s)
100
10
10
20
30
40
50
60
70
0
1
1000
OUTPUT ASSERTED ABOVE THIS LINE
MAX6775MAX6781
Low-Power, 1%-Accurate Battery
Monitor in DFN and SC70 Packages
4
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25C, unless otherwise noted.)
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE, MAX67__A
MAX6775 toc04
TEMPERATURE (
C)
THRESHOLD VOLTAGE (mV)
60
35
10
-15
-4
-3
-2
-1
0
1
-5
-40
85
NORMALIZED AT T
A
= +25
C
RISING
FALLING
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE, MAX67__B
MAX6775 toc05
TEMPERATURE (
C)
THRESHOLD VOLTAGE (mV)
60
35
10
-15
-3
-2
-1
0
1
-4
-40
85
NORMALIZED AT T
A
= +25
C
RISING
FALLING
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE, MAX67__C
MAX6775 toc06
TEMPERATURE (
C)
THRESHOLD VOLTAGE (mV)
60
35
10
-15
-2
-1
0
1
-3
-40
85
NORMALIZED AT T
A
= +25
C
RISING
FALLING
LBO OUTPUT VOLTAGE
vs. SINK CURRENT
MAX6775 toc07
SINK CURRENT (mA)
OUTPUT VOLTAGE (V)
12
9
6
3
0.1
0.2
0.3
0.4
0.5
0
0
15
V
BATT
= 5.0V
V
BATT
= 1.8V
V
BATT
= 3.3V
LBO OUTPUT VOLTAGE
vs. SOURCE CURRENT
MAX6775 toc08
SOURCE CURRENT (mA)
OUTPUT VOLTAGE (V)
4
3
2
1
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.0
0
5
V
BATT
= 5.0V
V
BATT
= 3.3V
V
BATT
= 1.8V
MAX6775MAX6781
Low-Power, 1%-Accurate Battery
Monitor in DFN and SC70 Packages
_______________________________________________________________________________________
5
Pin Description
MAX6775/
MAX6776
MAX6777/
MAX6778
MAX6779/
MAX6780/
MAX6781
DFN
SC70
DFN
SC70
DFN
NAME
FUNCTION
1
1
--
--
--
GND2
Reserved. Must be connected to GND. Do not use as the only
GND connection.
2
2
2
2
2
GND
Ground
3
3
--
--
--
LBI
Low-Battery Input. Connect to the resistive divider to set the
trip level.
4
4
4
4
--
LBO
Low-Battery Output, Active-Low. When V
LBI
/V
LBL
falls below
the falling threshold, LBO asserts. LBO deasserts when
V
LBI
/V
LBH
exceeds the rising threshold voltage.
5
--
5
--
--
N.C.
No Connection. Not internally connected.
6
5
6
5
6
BATT
Battery Input. Power supply to the device.
--
--
1
1
--
LBH
Rising-Trip-Level Input. Connect to a resistive divider to set the
rising trip level.
--
--
3
3
--
LBL
Falling-Trip-Level Input. Connect to a resistive divider to set the
falling trip level.
--
--
--
--
1
LBI2
Low-Battery Input 2. Connect to a resistive divider to set the
trip level.
--
--
--
--
3
LBI1
Low-Battery Input 1. Connect to a resistive divider to set the
trip level.
--
--
--
--
4
LBO1
Low-Battery Output 1, Active-Low. When V
LBI1
falls below the
falling threshold voltage, LBO1 asserts. LBO1 deasserts when
V
LBI1
exceeds the rising threshold voltage. LBO1 is push-pull
on the MAX6781 and open-drain for the MAX6779/MAX6780.
--
--
--
--
5
LBO2
Low-Battery Output 2, Active-Low. When V
LBI2
falls below the
falling threshold voltage, LBO2 asserts. LBO2 deasserts when
V
LBI2
exceeds the rising threshold voltage. LBO2 is open-drain.
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