ZSPM4121 Datasheet, PDF (9/17 Pages) Analog Devices – Under-Voltage Load Switch for Smart Battery Management

ZSPM4121
Under-Voltage Load Switch for Smart Battery Management
Figure 2.5 On Mode / Off Mode Transition Delay
Figure 2.6 Over-Current Retry Performance
3 Description of Circuit
The ZSPM4121 battery management load switch consists of an internally generated threshold voltage,
comparator with hysteresis, slew rate control for the load switch, a P-channel load switch, and an open-drain
indicator pin. When the input battery voltage is above the factory-configured threshold, the load switch is on (the
On Mode). When the input battery voltage falls to the threshold voltage or below, the load switch is off (the Off
Mode), and the quiescent current draw on the battery is in the order of 100pA (typical). The ZSPM4121 threshold
voltage is programmed at manufacturing to an option in the range of 1.2V to 4.2V with 100mV steps between
options. The 500mV hysteresis between the Off Mode and the On Mode prevents intermittent operation. The
ZSPM4121 also provides over-current protection.
Figure 3.1 ZSPM4121 Block Diagram
ZSPM4121
VCC
VOUT
Regulated
VTHRESH
NPG
Note: At manufacturing, VTHRESH is programmed to a
customer-selected threshold voltage in the range of
1.2V to 4.2V with 100mV steps between options.
GND
Data Sheet
April 30, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
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