UDG-11049

RF

TRIP

MODE

VDD

VREG VIN

VIN

VIN

VIN

VIN

VIN

TPS53353

VFB

EN

PGOOD

VBST

N/C

LL

LL

LL

1

2

3

4

5

6

7

8

9

10

11

22

21

20

19

18

17

16

15

14

13

12

C5

0.1 mF

VREG

22 mF

GND

LL

LL

LL

L1

0.44 mH

PA 0513 .441

330 mF

15 kW

R2

10 kW

R10

100 kW

R11

NI

C6

NI

330 mF

R9

2 W

22 mF

22 mF

22 mF

8 V

to

14 V

R6

200 kW

R8

110 kW

R4

NI

C4

4.7 mF

C3

1 mF

4.5 V to 25 V

EN

PGOOD

TPS53353

SLUSAK2B – AUGUST 2011 – REVISED FEBRUARY 2015

www.ti.com

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TPS53353 is a high-efficiency, single channel, synchronous buck converter suitable for low output voltage

point-of-load applications in computing and similar digital consumer applications. The device features proprietary

D-CAP mode control combined with an adaptive on-time architecture. This combination is ideal for building

modern low duty ratio, ultra-fast load step response DC-DC converters. The output voltage ranges from 0.6 V to

5.5 V. The conversion input voltage range is from 1.5 V up to 15 V and the VDD bias voltage is from 4.5 V to 25

V. The D-CAP mode uses the equivalent series resistance (ESR) of the output capacitor(s) to sense the device

current. One advantage of this control scheme is that it does not require an external phase compensation

network. This allows a simple design with a low external component count. Eight preset switching frequency

values can be chosen using a resistor connected from the RF pin to ground or VREG. Adaptive on-time control

tracks the preset switching frequency over a wide input and output voltage range while allowing the switching

frequency to increase at the step-up of the load.

8.2 Typical Applications

8.2.1 Typical Application Circuit Diagram

Figure 38. Typical Application Circuit Diagram

20

Submit Documentation Feedback

Copyright © 2011–2015, Texas Instruments Incorporated

Product Folder Links: TPS53353