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MAX6784TCC+-MAX6785TCB+T
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level Battery Monitors in Small TDFN and TQFN Packages
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages19-0541; Rev 3; 3/10
General DescriptionFeaturesThe MAX6782–MAX6790 are low-power, 1% accurate,
dual-/triple-/quad-level battery monitors offered in small
TDFN and TQFN packages. These devices are ideal for
monitoring single lithium-ion (Li+) cells, or multicell alka-
line/NiCd/NiMH power sources. These devices feature
fixed and adjustable hysteresis options to eliminate out-
put chattering associated with battery-voltage monitors.
The MAX6782/MAX6783 offer four battery monitors in a
single package with factory-set (0.5%, 5%, 10%) or
adjustable hysteresis. The MAX6784/MAX6785 provide
three battery monitors with factory-set (0.5%, 5%, 10%)
or adjustable hysteresis. The MAX6786/MAX6787/
MAX6788 offer two battery monitors with external inputs
for setting the rising and falling thresholds, allowing
external hysteresis control. The MAX6789/MAX6790 fea-
ture quad-level overvoltage detectors with complemen-
tary outputs.
The MAX6782–MAX6790 are offered with either open-drain
or push-pull outputs. The MAX6782/MAX6784/MAX6786/
MAX6789 are available with push-pull outputs while the
MAX6783/MAX6785/MAX6787/MAX6790 are available with
open-drain outputs. The MAX6788 is available with one
open-drain output and one push-pull output (see the
Selector Guide). This family of devices is offered in space-
saving TDFN and TQFN packages and is fully specified
over the-40°C to +85°C extended temperature range.
Ordering Information
Selector Guide
Applications
Ordering Information continued at end of data sheet.+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
The MAX6782/MAX6783/MAX6784/MAX6785 are available with
factory-trimmed hysteresis. Specify trim by replacing “_” with
“A” for 0.5%, “B” for 5%, or “C” for 10% hysteresis.
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
PARTTEMP RANGEPIN-PACKAGE
MAX6782TE_+-40°C to +85°C16 TQFN-EP*
MAX6783TE_+-40°C to +85°C16 TQFN-EP*
MAX6784TC_+-40°C to +85°C12 TQFN-EP*
MAX6785TC_+-40°C to +85°C12 TQFN-EP*
PARTMONITOR LEVELLBO OUTPUT
OVOV
OUTPUT TYPEHYSTERESISMAX6782TE_+4Quad——Push-PullFixed/Adj
MAX6783TE_+4Quad——Open DrainFixed/Adj
MAX6784TC_+3Triple——Push-PullFixed/Adj
MAX6785TC_+3Triple——Open DrainFixed/Adj
MAX6786TA+2Dual——Push-PullAdj
MAX6787TA+2Dual——Open DrainAdj
MAX6788TA+2Dual——Push-Pull/Open DrainAdj
MAX6789TB+4—SingleSinglePush-Pull—
MAX6790TB+4—SingleSingleOpen Drain—
Note:All devices are available in tape and reel in 2.5k increments. For tape and reel orders, add a “T” after the “+” to complete the part
Battery-Powered Systems
(Single-Cell Li+ or
Multicell NiMH, NiCd,Alkaline)
Cell Phones/Cordless
Phones
Pagers
Portable Medical Devices
PDAs
Electronic Toys
MP3 Players
1% Accurate Threshold Specified Over Full
Temperature RangeDual-/Triple-/Quad, Low-Battery Output OptionsLow 5.7µA Battery CurrentOpen-Drain or Push-Pull OutputsFixed or Adjustable HysteresisLow Input Bias CurrentGuaranteed Valid Low-Battery-Output Logic State
Down to VBATT= 1.05V
Reverse-Battery ProtectionImmune to Short Battery TransientsFully Specified from -40°C to +85°CSmall TDFN and TQFN Packages
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VBATT= 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.
(All voltages referenced to GND.)
BATT.........................................................................-0.3V to +6V
IN1–IN4, LBH1, LBL1,
LBH2, LBL2..................-0.3V to Min ((VBATT+ 0.3V) and +6V)
HADJ1–HADJ4, REF.......-0.3V to Min ((VBATT+ 0.3V) and +6V)
LBO1–LBO4(push-pull)..-0.3V to Min ((VBATT+ 0.3V) and +6V)
LBO1–LBO4(open drain).........................................-0.3V to +6V
Input Current (all pins)........................................................20mA
Output Current (all pins).....................................................20mA
Continuous Power Dissipation (TA= +70°C)
8-Pin TDFN (derate 23.8mW/°C above +70°C)..........1905mW
10-Pin TDFN (derate 24.4mW/°C above +70°C)........1951mW
12-Pin Thin QFN (derate 16.7mW/°C above +70°C)..1333mW
16-Pin Thin QFN (derate 20.8mW/°C above +70°C)..1667mW
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
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
TA = 0°C to +70°C1.055.5Operating Voltage Range
(Note 2)VBATTTA = -40°C to +85°C1.25.5V
VBATT = 3.7V, no load6.310µASupply CurrentIQVBATT = 1.8V, no load5.7µA
Startup Time (Note 3)VBATT rising from 0 to 1.6V5ms
MAX6782/MAX6783/MAX6784/MAX6785
0.5% hysteresis (A version)0.59940.60550.6115
5% hysteresis (B version)0.57230.57810.5839IN_ Falling Threshold (Note 4)VINF
10% hysteresis (C version)0.54220.54770.5531
IN_ Rising Threshold (Note 4)VINR0.60240.60850.6146V
IN_, HADJ_ Input Leakage
CurrentVIN_, VHADJ_ ≥ 0.3V5nA
Reference OutputVREF0.60240.60850.6146V
Reference Load RegulationIREF = 0 to 1mA0.3mV/mA
Reference Temperature
CoefficientTEMPCO15ppm/°C
Reference Short-Circuit Current20mA
Hysteresis Adjustment Range0.4VREFV
Hysteresis Adjustment Logic LowVHALL0.05V
Hysteresis Adjustment Logic
HighVHALH0.17V
MAX6786/MAX6787/MAX6788
LBL_, LBH_ ThresholdVTH0.60240.60850.6146V
LBL_, LBH_ Input Leakage
CurrentVLBL, VLBH_ ≥ 0.3V5nA
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
ELECTRICAL CHARACTERISTICS (continued)
(VBATT= 1.6V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
MAX6782–MAX6788
LBO_ Propagation DelaytPD±100mV overdrive30µs
VBATT ≥ 1.2V, ISINK = 100µA0.3V
VBATT ≥ 2.7V, ISINK = 1.2mA0.3VLBO_ Output Low Voltage (Push-
Pull or Open Drain)VOL
VBATT ≥ 4.5V, ISINK = 3.2mA0.4V
VBATT ≥ 1.6V, ISOURCE = 10µA0.8 x
VBATTV
VBATT ≥ 2.7V, ISOURCE = 500µA0.8 x
VBATTVLBO_ Output High Voltage
(Push-Pull) (Note 5)VOH
VBATT ≥ 4.5V, ISOURCE = 800µA0.8 x
VBATTV
LBO_ Output Leakage Current
(Open Drain)Output not asserted, VLBO_ = 0 or 5V500nA
MAX6789/MAX6790
IN_ Rising ThresholdVTH+0.60240.60850.6146V
IN_ Hysteresis31mV
IN_ Input Leakage CurrentVIN_ ≥ 0.3V5nA
OV, OV Delay TimetPD±100mV overdrive30µs
VBATT ≥ 1.6V, ISINK = 100µA, output
asserted0.3
VBATT ≥ 2.7V, ISINK = 1.2mA, output
asserted0.3OV Output Low Voltage (Push-
Pull or Open Drain)VOL
VBATT ≥ 4.5V, ISINK = 3.2mA, output
asserted0.4
VBATT ≥ 1.2V, ISOURCE = 10µA, output not
asserted
0.8 x
VBATT
VBATT ≥ 2.7V, ISOURCE = 500µA, output not
asserted
0.8 x
VBATT
OV Output High Voltage (Push-
Pull) (Note 5)VOH
VBATT ≥ 4.5V, ISINK = 800µA, output not
asserted
0.8 x
VBATT
OV Output Leakage Current
(Open Drain)Output not asserted, VOV, VOV = 0 or 5V500nA
VBATT ≥ 1.2V, ISINK = 100µA, output not
asserted0.3
VBATT ≥ 2.7V, ISINK = 1.2mA, output not
asserted0.3OV Output Low Voltage
(Push-Pull or Open Drain)VOL
VBATT ≥ 4.5V, ISINK = 3.2mA, output not
asserted0.4
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
ELECTRICAL CHARACTERISTICS (continued)
(VBATT= 1.6V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
VBATT ≥ 1.6V, ISOURCE = 10µA, output
asserted
0.8 x
VBATT
VBATT ≥ 2.7V, ISOURCE = 500µA, output
asserted
0.8 x
VBATT
OV Output High Voltage (Push-
Pull ) (Note 5)VOH
VBATT ≥ 4.5V, ISOURCE = 800µA, output
asserted
0.8 x
VBATT
OV Output Leakage Current
(Open Drain)Output asserted, VOV = 0 or 5V500nA
CLEAR Input Low VoltageVIL0.3 x
VBATTV
CLEAR Input High VoltageVIH0.7 x
VBATTV
CLEAR Pullup Resistance2580kΩ
CLEAR Minimum Pulse Width1µs
CLEAR Delay TimetCLD300ns
Note 1:Devices are tested at TA = +25°C and guaranteed by design for TA = TMIN to TMAXas specified.
Note 2:Operating voltage range ensures low battery output is in the correct state. Minimum battery voltage for electrical specifica-
tion is 1.6V.
Note 3:Reference and threshold accuracy is only guaranteed after the startup time. Startup time is guaranteed by design.
Note 4:The rising threshold is guaranteed to be higher than the falling threshold.
Note 5:The source current is the total source current from all outputs.
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
SUPPLY CURRENT
vs. TEMPERATURE
MAX6782 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (35-1510
VBATT = 5V
VBATT = 3.6V
VBATT = 1.8V
PROPAGATION DELAY
vs. TEMPERATURE
MAX6782 toc02
TEMPERATURE (°C)
PROPAGATION DELAY (3510-15
VIN_ = ±100mV OVERDRIVE
MAXIMUM TRANSIENT DURATION
vs. THRESHOLD OVERDRIVE
MAX6782 toc03
THRESHOLD OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (
OUTPUT ASSERTED ABOVE THIS LINE
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE (MAX6782TEA)
MAX6782 toc04
TEMPERATURE (°C)
NORMALIZED THRESHOLD (V)3510-15
NORMALIZED AT TA = +25°C
FALLING
RISING
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE (MAX6782TEB)
MAX6782 toc05
TEMPERATURE (°C)
NORMALIZED THRESHOLD (V)3510-15
NORMALIZED AT TA = +25°C
FALLING
RISING
NORMALIZED THRESHOLD VOLTAGES
vs. TEMPERATURE (MAX6782TEC)
MAX6782 toc06
TEMPERATURE (°C)
NORMALIZED THRESHOLD (V)3510-15
NORMALIZED AT TA = +25°C
FALLING
RISING
Typical Operating Characteristics
(VBATT= 3.6V, TA= +25°C, unless otherwise noted.)
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
Typical Operating Characteristics (continued)
(VBATT= 3.6V, TA= +25°C, unless otherwise noted.)
LBO OUTPUT VOLTAGE LOW
vs. SINK CURRENT
MAX6782 toc07
SINK CURRENT (mA)
OUTPUT VOLTAGE (V)963
VBATT = 1.8VVBATT = 3.3V
VBATT = 5.0V
MAX6782 toc08
SOURCE CURRENT (mA)
OUTPUT VOLTAGE (V)321
LBO OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENTVBATT = 1.8V
VBATT = 3.3V
VBATT = 5.0V
PUSH-PULL
VERSIONS
REFERENCE VOLTAGE
vs. TEMPERATUREMAX6782 toc09
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)3510-15
MAX6782TEA
REFERENCE VOLTAGE
vs. REFERENCE CURRENTMAX6782 toc10
REFERENCE CURRENT (mA)
REF
(V)
MAX6782TEB
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGEMAX6782 toc11
SUPPLY VOLTAGE (V)
REFERENCE VOLTAGE (V)
MAX6782TEB
CLEAR LATCH CIRCUITMAX6782 toc12
100μs/div
IN_
5V/div
CLEAR
5V/div
5V/div
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
Pin Description
PIN
MAX6782/
MAX6783
MAX6784/
MAX6785
NAMEFUNCTION1IN2Battery Monitor Input 2. Connect to an external resistive divider to set the trip
threshold for monitor 2.2IN3Battery Monitor Input 3. Connect to an external resistive divider to set the trip
threshold for monitor 3.—IN4Battery Monitor Input 4. Connect to an external resistive divider to set the trip
threshold for monitor 4.3REFReference Output. REF can source up to 1mA. REF does not require an external
bypass capacitor for stability. Keep the capacitance from REF to GND below 50pF.4HADJ1
Hysteresis Adjustment Input 1.
Connect HADJ1 to GND to select an internal preset hysteresis option.
Connect a resistive divider from REF to HADJ1 and to GND to externally adjust the
hysteresis for IN1 from its internal preset hysteresis (see Figure 6).5HADJ2
Hysteresis Adjustment Input 2.
Connect HADJ2 to GND to select an internal preset hysteresis option.
Connect a resistive divider from REF to HADJ2 and to GND to externally adjust the
hysteresis for IN2 from its internal preset hysteresis (see Figure 6).6HADJ3
Hysteresis Adjustment Input 3.
Connect HADJ3 to GND to select an internal preset hysteresis option.
Connect a resistive divider from REF to HADJ3 and to GND to externally adjust the
hysteresis for IN3 from its internal preset hysteresis (see Figure 6).—HADJ4
Hysteresis Adjustment Input 4.
Connect HADJ4 to GND to select an internal preset hysteresis option.
Connect a resistive divider from REF to HADJ4 and to GND to externally adjust the
hysteresis for IN4 from its internal preset hysteresis (see Figure 6).LBO4Active-Low, Low-Battery Output 4. LBO4 asserts when VIN4 falls below the falling
threshold voltage. LBO4 deasserts when VIN4 exceeds the rising threshold voltage.7LBO3Active-Low, Low-Battery Output 3. LBO3 asserts when VIN3 falls below the falling
threshold voltage. LBO3 deasserts when VIN3 exceeds the rising threshold voltage.8LBO2Active-Low, Low-Battery Output 2. LBO2 asserts when VIN2 falls below the falling
threshold voltage. LBO2 deasserts when VIN2 exceeds the rising threshold voltage.9LBO1Active-Low, Low-Battery Output 1. LBO1 asserts when VIN1 falls below the falling
threshold voltage. LBO1 deasserts when VIN1 exceeds the rising threshold voltage.10BATTBattery Input. Power supply to the device. For better noise immunity, bypass BATT
to GND with a 0.1µF capacitor as close to the device as possible.11GNDGround—N.C.No Connection. Not internally connected.12IN1Battery Monitor Input 1. Connect to an external resistive divider to set the trip
threshold for monitor 1.EPExposed Pad. Connect EP to the ground plane. Do not use EP as the only ground
connection.
MAX6782/MAX6783/MAX6784/MAX6785
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
Pin Description (continued)
PINNAMEFUNCTIONLBL1Falling Trip Level Input 1. Connect to an external resistive divider to set the falling trip level.LBH1Rising Trip Level Input 1. Connect to an external resistive divider to set the rising trip level.LBL2Falling Trip Level Input 2. Connect to an external resistive divider to set the falling trip level.LBH2Rising Trip Level Input 2. Connect to an external resistive divider to set the rising trip level.GNDGroundLBO2Active-Low, Low-Battery Output 2. LBO2 asserts when VLBL2 falls below the falling threshold voltage. LBO2
deasserts when VLBH2 exceeds the rising threshold voltage.LBO1Active-Low, Low-Battery Output 1. LBO1 asserts when VLBL1 falls below the falling threshold voltage. LBO1
deasserts when VLBH1 exceeds the rising threshold voltage.BATTBattery Input. Power supply to the device. For better noise immunity, bypass BATT to GND with a 0.1µF
capacitor as close to the device as possible.EPExposed Pad. Connect EP to the ground plane. Do not use EP as the only ground connection.
MAX6786/MAX6787/MAX6788
PINNAMEFUNCTIONIN1Overvoltage Monitor Input 1IN2Overvoltage Monitor Input 2IN3Overvoltage Monitor Input 3IN4Overvoltage Monitor Input 4GNDGroundCLEARActive-Low Clear Input. OV and OV do not latch when an overvoltage fault is detected if CLEAR is held low.
CLEAR has an internal pullup resistor to BATT.N.C.No Connection. Not internally connected.OV
Active-Low Overvoltage Output. When any of the inputs (VIN_) exceeds its respective rising threshold
voltage, OV asserts and stays asserted until CLEAR is pulled low or the power to the device is cycled. OV
does not latch when an overvoltage fault is detected if CLEAR is held low.OVActive-High Overvoltage Output. Inverse of OV.BATTBattery Input. Power supply to the device. For better noise immunity, bypass BATT to GND with a 0.1µF
capacitor as close to the device as possible.EPExposed Pad. Connect EP to the ground plane. Do not use EP as the only ground connection.
MAX6789/MAX6790
Detailed DescriptionThe MAX6782–MAX6788 are designed to monitor two
to four battery levels (1% accuracy) and assert an
active-low output indicator when the monitored voltage
level falls below the user-set threshold. Each battery
level is associated with an independent open-drain or
push-pull output. Each of these independent outputs
can be used to provide low battery warnings at differ-
ent voltage levels. Each of these monitored levels offers
fixed or adjustable hysteresis in order to prevent the
lighter loads. The MAX6782–MAX6785 also feature ref-
erence outputs that can source up to 1mA.
The MAX6789/MAX6790 monitor four overvoltage con-
ditions and assert the complementary overvoltage out-
puts when any voltage at the inputs exceeds its
respective threshold. The MAX6789/MAX6790 allow
each trip threshold to be set with external resistors.
These devices also feature a latch and a clear function.
Figures 1, 2, and 3 show the simplified block diagrams
for the MAX6782–MAX6790. See theSelector Guide.
MAX6782–MAX6790
Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN PackagesMAX6782
MAX6783
MAX6784
MAX6785HYSTERESIS
SELECT
GND
( ) MAX6782/MAX6783 ONLY
COMPARATOR
SECTION 1
REF
COMPARATOR
SECTION 2
COMPARATOR
SECTION 3
COMPARATOR
SECTION 4
REFERENCE
INTERNAL
HYSTERESIS
LADDER
BATT
IN1
HADJ1
LBO1
IN2
HADJ2
LBO2
IN3
HADJ3
LBO3
IN4
HADJ4
LBO4
Figure 1. MAX6782–MAX6785 Block Diagram
MAX6786
MAX6787
MAX6788
REF
BATT
RHYST
LBH_
LBL_
LBO_
GND
