TPS5432 Datasheet, PDF (1/28 Pages) Texas Instruments – 2.95V to 6V Input, 3A Output, 700kHz Synchronous Step Down Converter

TPS5432
www.ti.com
SLVSB89 – MARCH 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 –20°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 70mΩ
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
C_BOOT
TPS5432
0.1 mF LO
10 V 3.3 mH
PH ³
7
EN
C_O
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