MAX1614_11 Datasheet, PDF (8/9 Pages) Maxim Integrated Products – High-Side, n-Channel MOSFET Switch Driver Internal On/Off Latch

High-Side, n-Channel MOSFET
Switch Driver
Increasing Low-Battery
Comparator Hysteresis
The MAX1614 contains an on-chip comparator with 2%
hysteresis for low-battery detection. If more than 2%
hysteresis is needed on the low-battery comparator and
LBO is connected to OFF, use the circuit in Figure 5 to
add hysteresis. The circuit of Figure 5 shows LBO con-
trolling an n-channel MOSFET that shorts R2 to add pos-
itive feedback to the trip point. This is necessary to
prevent loading down the 1µA pullup at OFF (Figure 1).
N
N
2N7002
(SOT23)
BATT GATE
R1
SRC
ON
MAX1614
OFF
R2
LBI
LBO
R3
GND
LOAD
___________________Chip Information
SUBSTRATE CONNECTED TO GND
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
8 µMAX
PACKAGE
CODE
U8+1
LAND
OUTLINE NO. _{PATTERN NO.}
21-0036
90-0092
R1 = 909kΩ
R2, R3 = 150kΩ
V_L = 8.5V
V_H = 9.8V
HYSTERESIS = 6%
FALLING TRIP POINT V_L
( ) ^{VL = VTH}
R1 + R3
R3
RISING TRIP POINT V_H
( ) ^{VH = VTH}
R1 + R2 + R3
R3
Figure 5. Increasing Hysteresis of the Battery Disconnect
Circuit
8 _______________________________________________________________________________________