MAX6782 MAXIM [Maxim Integrated Products], MAX6782 Datasheet - Page 8

• Manufacturer Part Number: MAX6782
• Description: Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level Battery Monitors in Small TDFN and TQFN Packages
• Manufacturer: MAXIM [Maxim Integrated Products]

Low-Power, 1% Accurate, Dual-/Triple-/Quad-Level
Battery Monitors in Small TDFN and TQFN Packages
MAX6786/MAX6787/MAX6788
MAX6789/MAX6790
The 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
output from chattering as the battery recovers from the
8
PIN
PIN
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
10
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
CLEAR
NAME
NAME
LBH1
LBH2
LBO2
LBO1
BATT
LBL1
LBL2
BATT
GND
GND
N.C.
IN1
IN2
IN3
IN4
OV
OV
Falling Trip Level Input 1. Connect to an external resistive divider to set the falling trip level.
Rising Trip Level Input 1. Connect to an external resistive divider to set the rising trip level.
Falling Trip Level Input 2. Connect to an external resistive divider to set the falling trip level.
Rising Trip Level Input 2. Connect to an external resistive divider to set the rising trip level.
Ground
Active-Low, Low-Battery Output 2. LBO2 asserts when V
deasserts when V
Active-Low, Low-Battery Output 1. LBO1 asserts when V
deasserts when V
Battery 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.
Overvoltage Monitor Input 1
Overvoltage Monitor Input 2
Overvoltage Monitor Input 3
Overvoltage Monitor Input 4
Ground
Active-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.
No Connection. Not internally connected.
Active-Low Overvoltage Output. When any of the inputs (V
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.
Active-High Overvoltage Output. Inverse of OV.
Battery 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.
Detailed Description
LBH2
LBH1
exceeds the rising threshold voltage.
exceeds the rising threshold voltage.
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 the Selector Guide .
FUNCTION
FUNCTION
LBL2
LBL1
IN_
Pin Description (continued)
) exceeds its respective rising threshold
falls below the falling threshold voltage. LBO2
falls below the falling threshold voltage. LBO1