1 Features
• Ultra-low IQ: 200 nA (typ), even in dropout
• Shutdown IQ: 3 nA (typ)
• Excellent transient response (1 mA to 50 mA)
– < 10-μs settling time
– 80-mV undershoot
• Packages:
– 1.0-mm × 1.0-mm X2SON
– SOT23-5
– 0.64-mm × 0.64-mm DSBGA
• Input voltage range: 1.5 V to 6.0 V
• Output voltage range: 0.8 V to 5.0 V (fixed)
• Output accuracy: 1.5% over temperature
• Smart enable pulldown
• Very low dropout:
– 270 mV (max) at 200 mA (VOUT = 3.3 V)
• Stable with a 1-μF or larger capacitor

2 Applications
• Wearables electronics
• Thermostats, smoke and heat detectors
• Gas, heat, and water meters
• Blood glucose monitors and pulse oximeters
• Residential circuit breakers and fault indicators
• Building security and video surveillance devices
• EPOS card readers

3 Description
The TPS7A03 is an ultra-small, ultra-low quiescent
current low-dropout linear regulator (LDO) that can
source 200 mA with excellent transient performance.
The TPS7A03, with an ultra-low IQ of 200 nA, is
designed specifically for applications where very-low
quiescent current is a critical parameter. This device
maintains low IQ consumption even in dropout mode
to further increase battery life. When in shutdown or
disabled mode, the device consumes ultra-low,
3-nA IQ that helps increase the shelf life of the battery.
The TPS7A03 has an output range of 0.8 V to 5.0
V available in 50-mV steps to support the lower core
voltages of modern microcontrollers (MCUs).
The TPS7A03 features a smart enable circuit with an
internally controlled pulldown resistor that keeps the
LDO disabled even when the EN pin is left floating
and helps minimize the external components used to
pulldown the EN pin. This circuit also helps minimize
the current drawn through the external pulldown
circuit when the device is enabled.
The TPS7A03 is fully specified for TJ = –40°C to
+125°C operation.