1 Features
1• 4.5 V – 18 V Operating Voltage, 20 V (Max)
• 90 mΩ R DS(ON) (Typical)
• 0.4 A to 1.6 A Adjustable Current Limit
• ±2% Accurate ILIMIT at 1A at 25°C
• ±3% Overvoltage, Undervoltage Threshold
• Programmable dVO/dt Control
• Fault Output for Thermal Shutdown, UVLO and
OVP
• -40°C to 125°C Junction Temperature Range
• Auto-Retry and Latch-Off Versions
• UL2367 Recognized - File No. E169910
• UL60950 - Safe during Single Point Failure Test

2 Applications
• White Goods, Appliances
• Set Top Boxes, DVD and Gaming Consoles
• HDD and SSD drives
• Smart Meters, Gas Analyzers
• Smart Load Switch
• USB Switch
• Adapter Power Devices

3 Description
The TPS25921 is a compact, feature rich eFuse with
a full suite of protection functions. The wide operating
voltage allows control of many popular DC buses.
The precise ±2% current limit, at room temperature,
provides excellent accuracy making the TPS25921
well suited for many system protection applications.
Load, source and device protection are provided with
multiple programmable features including overcurrent,
overvoltage and undervoltage. 3% threshold accuracy for UV and OV, ensures tight supervision of bus
voltages, eliminating the need for supervisor circuitry.
Fault flag output (FLT) is provided for system status
monitoring and down stream load control.
For hot-plug-in boards, TPS25921 provides in-rush
current control and programmable output ramp-rate.
Output ramp rate is programmable using a capacitor at soft-start (SS) pin, for maximum design flexibility.