1 Features
• Input operating voltage range (VIN): 0.5 V – 4.5 V
• Bias voltage range: 2.3 V – 5.5 V
• Maximum continuous current: 1.5 A
• ON-resistance (RON): 7.5 mΩ (typ.)
• Regulated inrush current
• Integrated quick output discharge: 5.3 Ω
• Open drain Power-Good (PG) signal
• Turn-on time: < 200 μs at VIN = 1.0 V
• Thermal shutdown
• VBIAS undervoltage lockout (UVLO)
• Low power consumption:
– ON state (IQ): 10 μA (typ.)
– OFF state (ISD): 2.7 μA (typ.)
• Smart EN pin pulldown (RPD,EN)
– EN ≥ VIH (ION): 25 nA (typ.)
– EN ≤ VIL (RPD,ON): 500 kΩ (typ.)

2 Applications
• Wearables
• Solid state drive
• PC and notebooks
• Industrial PC
• Optical module

3 Description
The TPS22999 is a single-channel load switch that
is designed to achieve a fast turn-on time while
keeping a low inrush current The device contains an
N-channel MOSFET that can operate over an input
voltage range of 0.5 V to VBIAS –1.0 V and can
support a maximum continuous current of 1.5 A.
The switch is controlled by an enable pin (EN), which
is capable of interfacing directly with low voltage
GPIO signals (VIH = 0.8 V). The TPS22999 device
has an integrated 5.3-Ω quick output discharge path
when the switch is turned off to enable reliable system
operation. There is a Power-Good (PG) signal on the
device that indicates when the main MOSFET has
fully settled to the lowest resistance path , which can
be used to enable a downstream load. Integrated
thermal shutdown makes sure of protection in high
temperature environments.
The TPS22999 is available in a 0.35 mm pitch, 8-
pin WCSP package (YCH) and is characterized for
operation over the free-air temperature range of –
40°C to +105°C.