Overview
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 (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)
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 468 KB | |
| Guide | 7Z 1.21 MB | |
| Manual - Development Tools | PDF 287 KB | |
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Design & Development
Boards & Kits
Evaluation
ZSPM4121W17KIT
Not Recommended for New Designs
Evaluation Kit for ZSPM4121W17
The ZSPM4121 Evaluation Board is a compact system designed to facilitate measuring the performance and operating characteristics of the ZSPM4121 Under-Voltage Load Switch. For the ZSPM4121W17KIT, the board includes a ZSPM4121AI1W17 sample, which is factory configured for a VTHRESH factory of...
Recommended Documents:
Evaluation
ZSPM4121W30KIT
Not Recommended for New Designs
Evaluation Kit for ZSPM4121W30
The ZSPM4121 Evaluation Board is a compact system designed to facilitate measuring the performance and operating characteristics of the ZSPM4121 Under-Voltage Load Switch. For the ZSPM4121W30KIT, the board includes a ZSPM4121AI1W30 sample, which is factory configured for a VTHRESH factory of...
Recommended Documents:
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
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