High-Side, n-Channel MOSFET

Switch Driver

8

_______________________________________________________________________________________

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).

___________________Chip Information

SUBSTRATE CONNECTED TO GND

MAX1614

OFF

LBO

GND

LBI

SRC

GATE

N

ON

BATT

LOAD

R2

N

2N7002

(SOT23)

R1

R3

R1 = 909k

Ω

R2, R3 = 150k

Ω

HYSTERESIS = 6%

(

)

(

)

R1 + R2 + R3

R3

R1 + R3

R3

Figure 5. Increasing Hysteresis of the Battery Disconnect

Circuit

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

PACKAGE

CODE

OUTLINE NO.

LAND

PATTERN NO.

8 µMAX

U8+1

21-0036

90-0092