Datasheet

1
2
3
4
8
7
6
5
BOOT
VIN
PH
GND
SS
EN
COMP
VSENSE
Thermal
Pad
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)
PIN FUNCTIONS
PIN
DESCRIPTION
NAME NUMBER
A bootstrap cap is required between BOOT and PH. If the voltage on this cap is below the minimum
BOOT 1
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
COMP 6
to this pin.
This pin has an internal pull up which enables switching if left open. To disable switching and reduce
EN 7
quiescent current, this pin must be pulled to ground.
GND 4 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)
PH 3
rectifier MOSFET.
SS 8 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
THERMAL PAD 9
be connected to any internal PCB ground plane using multiple vias for good thermal performance.
VIN 2 Supplies the control circuitry and switches of the power converter. The range is 2.95V to 6V.
VSENSE 5 Inverting node of the gm error amplifier.
ORDERING INFORMATION
(1)
T
j
PACKAGE
(2) (3)
ORDERABLE PART NUMBER
Tube TPS5432DDA
–40°C to 125°C 8-pin SOIC PowerPAD™
Tape and Reel 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.
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Product Folder Links: TPS5432