TPS5432 Converter Datasheet

TPS5432 Datasheet, PDF, Equivalent


Part Number

TPS5432

Description

700kHz Synchronous Step Down Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download TPS5432 Datasheet


TPS5432
TPS5432
www.ti.com
SLVSB89A – MARCH 2012 – REVISED OCTOBER 2012
2.95V to 6V Input, 3A Output, 700kHz Synchronous Step Down Converter
Check for Samples: TPS5432
FEATURES
1
2 Two 70mΩ (typical) MOSFETs for 3A
Continuous Output Current
• Current Mode Control With External
Compensation
• 700kHz Switching Frequency
• 360µA no Load Quiescent Operating Current
(no switching)
• 0.808V Internal Voltage Reference
• ±2.0% Reference Accuracy at 25°C
• ±3.0% Reference Accuracy Over Temperature
Range –40°C~125°C
• Stable Operation With Ceramic Output
Capacitor
• Adjustable Slow Start
• Cycle by Cycle Current Limit, and Frequency
Fold Back Protection
• Thermally Enhanced 8-Pin SOIC (DDA)
Package
APPLICATIONS
• Consumer Applications such as DTV, Set Top
Boxes, LCD displays, CPE
• Low-Voltage Point-of-Load Regulations for
SoC, CPU, DSP
DESCRIPTION
The TPS5432 is a 6V, 3A, low Iq, current mode,
synchronous monolithic buck converter with
integrated MOSFETs. The TPS5432 enables small
designs by integrating the MOSFETs, implementing
current mode control to reduce external component
count, reducing inductor size by 700kHz switching
frequency. SOIC-8 package with exposed thermal
pad provides both thermally enhanced solution and
easy to use.
The TPS5432 provides accurate regulation for a
variety of loads with an accurate 3.0% voltage
reference over temperature.
Efficiency is maximized through the integrated 70m
MOSFETs and 360μA typical supply current. Using
the enable pin, shutdown supply current is reduced to
2 µA by entering a shutdown mode.
The output voltage startup ramp is controlled by the
slow start pin. A ceramic capacitor at this pin can
easily adjust the slow start time.
Frequency fold back and thermal shutdown protects
the device during an over-current condition.
SIMPLIFIED SCHEMATIC
INPUT
3-6 V
Cin
10 mF
10 V
Rc
4.99 kW
Cc
3.3 nF
Css
0.01 mF
2 VIN
1
BOOT
CBOOT
TPS5432
0.1 mF LO
10 V 3.3 mH
PH 3
7
EN
CO
22 mFx2
6
COMP
5
VSENSE
8
SS
4
GND
1.2 V@3 A
R1
10 kW
R2
20 kW
Cff
390 pF
100
95
90
85
80
75
70
65
60
55
50
0
Vin = 5 V, Vout = 1.2 V
Vin = 3.3 V, Vout = 1.2 V
Vin = 5 V, Vout = 1.8 V
Vin = 3.3 V, Vout = 1.8 V
Vin = 5 V, Vout = 3.3 V
500 1000 1500 2000 2500 3000
Load Current - mA
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated

TPS5432
TPS5432
SLVSB89A – MARCH 2012 – REVISED OCTOBER 2012
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
PIN CONFIGURATION
SO-8 WITH THERMAL PAD
(TOP VIEW)
BOOT
1
8 SS
VIN 2
7 EN
Thermal
Pad
PH 3
6 COMP
GND
4
5 VSENSE
NAME
BOOT
PIN
NUMBER
1
COMP
6
EN
GND
PH
SS
THERMAL PAD
VIN
VSENSE
7
4
3
8
9
2
5
PIN FUNCTIONS
DESCRIPTION
A bootstrap cap is required between BOOT and PH. If the voltage on this cap is below the minimum
required by the output device, the output is forced to switch off until the cap is refreshed.
Error amplifier output, and input to the output switch current comparator. Connect frequency compensation
to this pin.
This pin has an internal pull up which enables switching if left open. To disable switching and reduce
quiescent current, this pin must be pulled to ground.
Ground. This pin should be electrically connected directly to the thermal pad under the IC
The source of the internal high side power MOSFET, and drain of the internal low side (synchronous)
rectifier MOSFET.
Slow start time setting. An external capacitor connected to this pin sets the output rise time
GND pin should be connected to the exposed thermal pad for proper operation. This thermal pad should
be connected to any internal PCB ground plane using multiple vias for good thermal performance.
Supplies the control circuitry and switches of the power converter. The range is 2.95V to 6V.
Inverting node of the gm error amplifier.
Tj
–40°C to 125°C
ORDERING INFORMATION(1)
PACKAGE(2) (3)
8-pin SOIC PowerPAD™
Tube
Tape and Reel
ORDERABLE PART NUMBER
TPS5432DDA
TPS5432DDAR
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(3) All package options have Cu NIPDAU lead/ball finish.
2 Submit Documentation Feedback
Product Folder Links: TPS5432
Copyright © 2012, Texas Instruments Incorporated


Features TPS5432 www.ti.com SLVSB89A – MARCH 2012 – REVISED OCTOBER 2012 2.95V to 6V Input, 3A Output, 700kHz Synchronou s Step Down Converter Check for Samples : TPS5432 FEATURES 1 •2 Two 70mΩ (t ypical) MOSFETs for 3A Continuous Outpu t Current • Current Mode Control With External Compensation • 700kHz Switc hing Frequency • 360µA no Load Quies cent Operating Current (no switching) 0.808V Internal Voltage Reference ±2.0% Reference Accuracy at 25°C ±3.0% Reference Accuracy Over Temper ature Range –40°C~125°C • Stable Operation With Ceramic Output Capacitor • Adjustable Slow Start • Cycle by Cycle Current Limit, and Frequency Fol d Back Protection • Thermally Enhance d 8-Pin SOIC (DDA) Package APPLICATIONS • Consumer Applications such as DTV, Set Top Boxes, LCD displays, CPE • L ow-Voltage Point-of-Load Regulations fo r SoC, CPU, DSP DESCRIPTION The TPS543 2 is a 6V, 3A, low Iq, current mode, sy nchronous monolithic buck converter with integrated MOSFETs. The TPS5432 enables small designs by inte.
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