ZSPM4121

Under-Voltage Load Switch for Smart Battery Management

© 2012 Zentrum Mikroelektronik Dresden AG

— Rev. 1.00

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The information furnished in this publication is subject to changes without notice.

ZSPM4121

GND

VOUT

NPG

VCC

customer-selected threshold voltage in the range of

1.2V to 4.2V with 100mV steps between options.

Regulated

Brief Description

The ZSPM4121 battery management load switch

can be used to protect a battery from excessive

discharge. It actively switches the battery power

source off if it drops to a set threshold (Off Mode).

When the input battery voltage is above the

threshold, the load switch is on (On Mode). The

ZSPM4121 threshold

voltage

grammed at manufacturing to a set point in the

range of 1.2V to 4.2V with 100mV steps between

options.

When the input battery voltage has been switched

off by the ZSPM4121, the quiescent current draw on

the battery is in the order of 100pA (typical). The

quiescent current in the on state is as low as 70nA.

The ZSPM4121 consists of an internally generated

threshold voltage, a comparator with hysteresis,

slew rate control for the load switch, a P-channel

load switch, and an open-drain indicator pin. The

500mV hysteresis between the Off Mode and the On

Mode

prevents

intermittent

operation.

The

ZSPM4121 also provides over-current protection.

Benefits

Off Mode: 100pA (typical)

(typical)

Features

VCC drops below a set threshold (programmed

at manufacturing)

100mV steps (factory programmed)

Related ZMDI Smart Power Products

Available Support

Physical Characteristics

ZSPM4121 Block Diagram