1 Features
• Features and configured for a wide range of
applications
– 3.8-V to 17-V input voltage range
– Fixed 3.3-V output voltage for TPSM861253
– ± 1 % output voltage accuracy from 0 to 65°C
– Integrated 55-mΩ and 24-mΩ MOSFETs
– 100-μA low quiescent current
– 1.4-MHz switching frequency
– Maximum 95 % large duty cycle operation
– Precision EN threshold voltage
– 1.6-ms fixed typical soft-start time
• Ease of use and small design size
– TPSM861253 forced continuous conduction
mode (FCCM) at light loading
– Fast transient D-CAP3™ control mode
– Easy layout with integrated inductor and
feedback resistance
– Support start-up with prebiased output voltage
– Open-drain power-good indicator
– Non-latch for OV, OT, and UVLO protection
– Hiccup mode in UV protection
– Cycle-by-cycle OC and NOC protection
– –40°C to 125°C operating junction temperature
– 3.3-mm × 4-mm × 2-mm QFN package

2 Applications
• Merchant network and server PSU
• Other AC/DC adapters/PSU
• Factory automation and control
• Test and measurement

3 Description
The TPSM861253 is a simple, easy-to-use, highefficiency,
high-power density, synchronous buck
module with input voltage ranging from 3.8 V to 17
V and supports up to 1-A continuous current.
The TPSM861253 employs D-CAP3 control mode
to provide a fast transient response and to support
low-ESR output capacitors with no requirement for
external compensation. The device can support up to
95% duty cycle operation.
TPSM861253 is fixed 3.3-V output voltage part
with FCCM mode. The device integrates complete
protection through OVP, OCP, UVLO, OTP, and UVP
with hiccup.
The device is available in a QFN package. The
junction temperature is specified from –40°C to
125°C.