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.