19-3774; Rev 2; 1/06
Low-Power, 1%-Accurate Battery
Monitors in µDFN and SC70 Packages
General Description
The MAX6775–MAX6781 low-power, 1%-accurate bat-
tery monitors are available in the ultra-small µDFN
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 µDFN
packages, and is fully specified over the -40°C to
+85°C extended temperature range.
♦
♦
♦
♦
♦
Features
♦
1.0%-Accurate Threshold Specified Over
Temperature
Single/Dual, Low-Battery Output Options
Low 3µA 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 -40°C to +85°C
♦
Small 5-Pin SC70 or Ultra-Small 6-Pin µDFN
(1mm x 1.5mm) Package
MAX6775–MAX6781
Ordering Information
PART
MAX6775XK_+T
MAX6775LT_+T*
MAX6776XK_+T
MAX6776LT_+T
MAX6777XK+T
MAX6777LT+T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
5 SC70-5
6 µDFN-6
5 SC70-5
6 µDFN-6
5 SC70-5
6 µDFN-6
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.
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
3.6V
Typical Operating Circuit
BATT
MAX6775
LBI
LBO
IN
DC-DC
CONVERTER
SHDN
OUT
Pin Configurations appear 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, 1%-Accurate Battery
Monitors in µDFN and SC70 Packages
MAX6775–MAX6781
ABSOLUTE MAXIMUM RATINGS
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
= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............247mW
6-Pin µDFN (derate 2.1mW°C above +70°C) ..............168mW
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
= 1.6V to 5.5V, T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
(Note 2)
Supply Current
SYMBOL
V
BATT
I
Q
CONDITIONS
T
A
= 0°C to +70°C
T
A
= -40°C to +85°C
V
BATT
= 3.7V, no load
V
BATT
= 1.8V, no load
0.5% hysteresis version
LBI, LBI_ Falling Threshold
(Note 3)
LBI Rising Threshold
LBI Input Leakage Current
LBL, LBH Threshold
LBL, LBH Input Leakage Current
V
LBIF
V
LBIR
0.2V
≤
V
LBI
≤
V
BATT
- 0.2V
V
BATT
= 1.8V to 5.5V
V
BATT
- 0.2V
≥
V
LBL/LBH
≥
0.2V
5% hysteresis version
10% hysteresis version
1.2037
1.1493
1.0888
1.2098
-5
1.2098
-5
1.222
MIN
1.0
1.2
4
3.2
1.2159
1.1609
1.0998
1.222
TYP
MAX
5.5
5.5
7
6
1.2280
1.1725
1.1108
1.2342
+5
1.2342
+5
V
nA
V
nA
V
UNITS
V
µA
FIXED HYSTERESIS
(MAX6775/MAX6776/MAX6779/MAX6780/MAX6781)
ADJUSTABLE HYSTERESIS
(MAX6777/MAX6778)
2
_______________________________________________________________________________________
Low-Power, 1%-Accurate Battery
Monitors in µDFN and SC70 Packages
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 1.6V to 5.5V, T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Propagation Delay
Startup Time
Output Low (Push-Pull or
Open-Drain)
V
OL
SYMBOL
t
PD
CONDITIONS
V
LBI_
+ 100mV to V
LBI_
- 100mV
V
BATT
rising above 1.6V
V
BATT
≥
1.2V, I
SINK
= 100µA
V
BATT
≥
2.7V, I
SINK
= 1.2mA
V
BATT
≥
4.5V, I
SINK
= 3.2mA
V
BATT
≥
1.6V, I
SOURCE
= 100µA
Output High (Push-Pull )
V
OH
V
BATT
≥
2.7V, I
SOURCE
= 500µA
V
BATT
≥
4.5V, I
SOURCE
= 800µA
Output Leakage Current
(Open-Drain)
Output not asserted, V
LBO_
= 5.5V
0.8 x
V
BATT
0.8 x
V
BATT
0.8 x
V
BATT
-100
+100
nA
V
MIN
TYP
9
3
0.3
0.3
0.3
V
MAX
UNITS
µs
ms
LOW-BATTERY OUTPUTS
(LBO,
LBO1, LBO2)
MAX6775–MAX6781
Note 1:
Devices are tested at T
A
= +25°C 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.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAXIMUM TRANSIENT DURATION
vs. THRESHOLD OVERDRIVE
MAX6775 toc02
SUPPLY CURRENT
vs. TEMPERATURE
MAX6775 toc01
PROPAGATION DELAY
vs. TEMPERATURE
12
V
BATT
= 1.6V
PROPAGATION DELAY (µs)
11
70
MAXIMUM TRANSIENT DURATION (µs)
60
50
40
30
20
10
0
85
1
OUTPUT ASSERTED ABOVE THIS LINE
5.5
SUPPLY CURRENT (µA)
5.0
4.5
4.0
3.5
3.0
2.5
-40
-15
10
35
60
V
BATT
= 2.4V
V
BATT
= 1.6V
V
BATT
= 5V
V
BATT
= 3.6V
V
BATT
= 3V
10
V
BATT
= 5V
9
8
100mV OVERDRIVE
85
7
-40
-15
10
35
60
10
100
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
THRESHOLD OVERDRIVE V
TH
- V
CC
(mV)
_______________________________________________________________________________________
MAX6775 toc03
6.0
3
Low-Power, 1%-Accurate Battery
Monitors in µDFN and SC70 Packages
MAX6775–MAX6781
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE, MAX67__A
MAX6775 toc04
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE, MAX67__B
MAX6775 toc05
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE, MAX67__C
NORMALIZED AT T
A
= +25°C
MAX6775 toc06
1
0
THRESHOLD VOLTAGE (mV)
NORMALIZED AT T
A
= +25°C
1
NORMALIZED AT T
A
= +25°C
1
THRESHOLD VOLTAGE (mV)
RISING
-1
FALLING
-2
-3
-4
-5
-40
-15
10
35
60
85
TEMPERATURE (°C)
RISING
FALLING
THRESHOLD VOLTAGE (mV)
0
0
FALLING
RISING
-1
-1
-2
-3
-2
-4
-40
-15
10
35
60
85
TEMPERATURE (°C)
-3
-40
-15
10
35
60
85
TEMPERATURE (°C)
LBO OUTPUT VOLTAGE
vs. SINK CURRENT
MAX6775 toc07
LBO OUTPUT VOLTAGE
vs. SOURCE CURRENT
5.0
4.5
OUTPUT VOLTAGE (V)
4.0
3.5
3.0
2.5
2.0
1.5
V
BATT
= 1.8V
V
BATT
= 3.3V
MAX6775 toc08
0.5
V
BATT
= 1.8V
0.4
OUTPUT VOLTAGE (V)
V
BATT
= 3.3V
5.5
V
BATT
= 5.0V
0.3
0.2
V
BATT
= 5.0V
0.1
0
0
3
6
9
12
15
SINK CURRENT (mA)
1.0
0
1
2
3
4
5
SOURCE CURRENT (mA)
4
_______________________________________________________________________________________
Low-Power, 1%-Accurate Battery
Monitors in µDFN and SC70 Packages
Pin Description
MAX6775/
MAX6776
µDFN
1
2
3
SC70
1
2
3
MAX6777/
MAX6778
µDFN
—
2
—
SC70
—
2
—
MAX6779/
MAX6780/
MAX6781
µDFN
—
2
—
GND2
GND
LBI
Reserved. Must be connected to GND. Do not use as the only
GND connection.
Ground
Low-Battery Input. Connect to the resistive divider to set the
trip level.
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.
No Connection. Not internally connected.
Battery Input. Power supply to the device.
Rising-Trip-Level Input. Connect to a resistive divider to set the
rising trip level.
Falling-Trip-Level Input. Connect to a resistive divider to set the
falling trip level.
Low-Battery Input 2. Connect to a resistive divider to set the
trip level.
Low-Battery Input 1. Connect to a resistive divider to set the
trip level.
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 MAX6779/MAX6781 and open-drain for the MAX6780.
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
for the MAX6780/MAX6781 and push-pull for the MAX6779.
MAX6775–MAX6781
NAME
FUNCTION
4
5
6
—
—
—
—
4
—
5
—
—
—
—
4
5
6
1
3
—
—
4
—
5
1
3
—
—
—
—
6
—
—
1
3
LBO
N.C.
BATT
LBH
LBL
LBI2
LBI1
—
—
—
—
4
LBO1
—
—
—
—
5
LBO2
_______________________________________________________________________________________
5
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