1 Features
1• 2.7 V – 18 V Operating Voltage, 20 V (Max)
• 42 mΩ R ON (Typical)
• 0.6 A to 5.3 A Adjustable Current Limit (±8%)
• IMON Current Indicator Output (±8%)
• 200 μA Operating I Q (Typical)
• 95 μA DevSleep Mode IQ (Typical)
• 15 μA Disabled IQ (Typical)
• ±2% Overvoltage, Undervoltage Threshold
• Reverse Current Blocking
• 1 μs Reverse Voltage Shutoff
• Programmable dVo/dt Control
• Power Good and Fault Outputs
• -40°C to 125°C Junction Temperature Range
• UL 2367 Recognized
– File No. 169910
– RILIM ≥ 20 kΩ (4.81 A max)
• UL60950 - Safe during Single Point Failure Test
– Open/Short ILIM detection

2 Applications
• PCIe/SATA/SAS HDD and SSD Drives
• Enterprise and Micro Servers
• Smart Load Switch
• Set-Top-Box (STB), DTVs and Game Consoles
• RAID Cards - Holdup Power Management
• Telecom Switches and Routers
• Adapter Powered Devices

3 Description
The TPS25940 eFuse Power Switch is a compact,
feature rich power management device with a full
suite of protection functions, including a low power
DevSleep™ mode that supports compliance with the
SATA™ Device Sleep standard. The wide operating
range allows control of many popular DC bus
voltages. Integrated back to back FETs provide
bidirectional current control making the device well
suited for systems with load side holdup energy that
must not drain back to a failed supply bus.
Load, source and device protection are provided with
many programmable features including overcurrent,
dVo/dt ramp and overvoltage, undervoltage
thresholds. For system status monitoring and
downstream load control, the device provides
PGOOD, FLT and precise current monitor output.
Precise programmable undervoltage, overvoltage thresholds and the low IQ DevSleep mode simplify
SSD power management design.
The TPS25940 monitors V(IN) and V(OUT) to provide
true reverse current blocking when V(IN) < (V(OUT) - 10
mV). This function supports swift changeover to a
boosted voltage energy storage element in systems
where backup voltage is greater than bus voltage.