TPSM861253 3.8V to 17V Input, 1A, Synchronous Buck Module in QFN Package

1 Features

• Configured for a wide range of applications

– 3.8V to 17V wide input voltage range

– Fixed 3.3V output voltage for TPSM861253

– ±1% output voltage accuracy from 0 to 65°C

– Integrated 55mΩ and 24mΩ MOSFETs

– 1.4MHz switching frequency

– Maximum 95% large duty cycle operation

– 1.2V precision EN threshold voltage

– 1.6ms 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 resistor

– 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

– 3.3mm × 4mm × 2mm QFN package

• Create a custom design using the TPSM861253

with the WEBENCH® Power Designer

2 Applications

• Merchant network and server PSU

• AC/DC adapters/PSU

• Factory automation and control

• Test and measurement

3 Description

The TPSM861253 is a simple, easy-to-use, high-

efficiency, high-power density, synchronous buck

module with input voltage ranging from 3.8V to 17V

and supports up to 1A 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 3.3V 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.

Package Information

PART NUMBER

PACKAGE

(1)

PACKAGE SIZE(2)

TPSM861253

RDX (QFN-FCMOD, 7)

4.00mm × 3.30mm

(1)

For more information, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

VOUT

PG

VOS

VIN

EN

PGND

V

OUT

EN

VIN

Cout

Cin

1

6

4

3

5

7

PG

Simplified Schematic

Iout (A)

0.001

0.01

0.1

1

0

20%

40%

60%

80%

100%

TPSM861253 Efficiency at VIN = 12V

TPSM861253

SLUSFD2A – SEPTEMBER 2023 – REVISED JANUARY 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.