TPS53353_16 Datasheet, PDF (20/37 Pages) Texas Instruments – Synchronous Buck SWIFT Converter

TPS53353
SLUSAK2C – AUGUST 2011 – REVISED FEBRUARY 2016
8 Application and Implementation
www.ti.com
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
C4
C3
4.7 mF 1 mF
R6
R4
R8
200 kW
NI
110 kW
VVDD
4.5 V to 25 V
22
21
20
19
18 17 16 15 14 13 12
RF
TRIP MODE VDD VREG VIN VIN VIN VIN VIN VIN
CIN
22 mF
CIN
22 mF
CIN
22 mF
VIN 8 V
to
CIN
14 V
22 mF
VREG
PGOOD
EN
VFB
R10
1
100 kW
R2
10 kW
TPS53353
GND
EN PGOOD VBST N/C LL LL LL _{LL LL LL}
2
3
4
5 6 7 8 9 10 11
R9
2W
C5
0.1 mF
15 kW
L1
0.44 mH
PA 0513.441
R11
NI
C6
NI
Figure 38. Typical Application Circuit Diagram
VOUT
COUT
330 mF
COUT
330 mF
UDG-11049
20
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