TPS54KB2x 4-V to 16-V Input, 25-A, Remote Sense,

D-CAP4 Synchronous Buck Converter

1 Features

• 4-V to 16-V input voltage range

• 3.13-V to 5.3-V external VCC bias support

• 5.8-mΩ and 2.3-mΩ MOSFETs (VVCC = 3.3 V)

• 25-A continuous output current

• Optimized 16-pin VQFN-HR package for efficiency

and thermal performance

• ±0.5% reference (VREF) for TJ = –40°C to +125°C

• VREF to 5.5-V output voltage range

• Differential remote sense

• D-CAP4 with ultra fast load-step response

• Supports all ceramic output capacitors

• Selectable Auto-skip Eco-mode for high light-load

efficiency

• Programmable current limit with RILIM

• Selectable switching frequency:

800 kHz, 1.1 MHz, 1.4 MHz

• Programmable soft-start time

• Prebiased start-up capability

• Open-drain power-good output

• Valley overcurrent limit protection

• Overvoltage and undervoltage fault protection

2 Applications

• Rack server and blade server

• Hardware accelerator and add-in cards

• Data center switches

• Industrial PC

• Baseband unit (BBU)

3 Description

The TPS54KB2x device is a small, high-efficiency,

synchronous buck converter with an adaptive on-

time D-CAP4 control mode. The control method

provides low minimum on-time and fast load-transient

response across the entire output voltage range

without requiring an external compensation network.

Because external compensation is not required, the

device is easy to use and requires few external

components. The device is well-designed for space-

constrained data center applications.

The TPS54KB2x device has differential remote sense,

high-performance integrated MOSFETs, and an

accurate ±0.5% reference over the specified operating

junction temperature range. The device features

accurate load regulation and line regulation, Eco-

mode or FCCM operation, programmable settings

through the MSEL pin and programmable soft-start.

The TPS54KB2x device is a lead-free device. The

device is RoHS compliant without exemption.

Device Information

PART

NUMBER(1)

VREF (V)

FAULT

RESPONSE

BODY SIZE

(NOM)

TPS54KB20

0.9

Latch-off

3.00 mm × 3.50

mm

TPS54KB21(2)

0.5

Latch-off

TPS54KB22(2)

0.9

Hiccup

TPS54KB23(2)

0.5

Hiccup

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

Product preview.

V

OUT

V

IN

ILIM

AGND

PG

FB

BOOT

SW

GOSNS

EN

VIN

PGND

MSEL

VCC

SS

V

OSNS+

V

OSNS-

EN

PG

Net-tie

Simplified Schematic

Output Current (A)

0

2

4

6

8

10

12

14

16

18

20

22

2425

80

82

84

86

88

90

92

94

96

98

100

VOUT = 1.05 V, fSW = 1100 kHz, DCR = 0.15 m

VOUT = 3.3 V, fSW = 800 kHz, DCR = 1.35 m

VOUT = 5 V, fSW = 800 kHz, DCR = 2.1 m

Typical Application Efficiency (VIN = 12 V, Internal

VCC, Skip-Mode)

TPS54KB20

SLVSGP3 – MAY 2023

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. ADVANCE INFORMATION for preproduction products; subject to change

without notice.