Under-Voltage Load Switch for Smart Battery Management

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 (VTHRESH) is programmed 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.

Features

  • Power source is actively switched off when VCC drops below a set threshold (programmed at manufacturing)
  • Wide input voltage range: 1.2V to 5.5V
  • Threshold voltage options: 1.2V to 4.2V in 100mV steps (factory programmed)
  • Supervisory over-current limit shutdown
  • Low drop-out disconnect from VCC to loads
  • Controlled turn-on slew rate
  • 500mV Off Mode to On Mode hysteresis
  • Over-current shutdown (3A)

Product Options

Orderable Part ID Part Status Buy Sample
ZSPM4121AI1W17 Not Recommended for New Designs Availability
ZSPM4121AI1W21 Not Recommended for New Designs Availability
ZSPM4121AI1W23 Not Recommended for New Designs Availability
ZSPM4121AI1W24 Not Recommended for New Designs Availability
ZSPM4121AI1W25 Not Recommended for New Designs Availability
ZSPM4121AI1W26 Not Recommended for New Designs Availability
ZSPM4121AI1W28 Not Recommended for New Designs Availability
ZSPM4121AI1W30 Not Recommended for New Designs Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
ZSPM4121 Datasheet Datasheet PDF 397 KB Jan 28, 2016
ZSPM4121 Short-form Datasheet Short Form Datasheet PDF 56 KB Jan 28, 2016
User Guides & Manuals
ZSPM4121 Evaluation Kit Description Manual PDF 176 KB Apr 20, 2016
Other
IDT CAD Altium Libraries for AID Products Rev 20160819 PCB Design Files ZIP 1.20 MB Aug 18, 2016

Evaluation Boards

Part Number Title Sort ascending
ZSPM4121W30KIT Evaluation Kit for ZSPM4121W30
ZSPM4121W17KIT Evaluation Kit for ZSPM4121W17