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www.ti.com
SLVS519 − MAY 2004
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FEATURES
DESCRIPTION
D
100 mΩ, 4.5-A Peak MOSFET Switch for High
Efficiency at 3-A Continuous Output Current
Uses External Lowside MOSFET or Diode
Fixed Output Versions −
1.2V/1.5V/1.8V/2.5V/3.3V/5.0V
Internally Compensated for Low Parts Count
Synchronizes to External Clock
1805 Out of Phase Synchronization
Wide PWM Frequency − Fixed 250 kHz,
500 kHz or Adjustable 250 kHz to 700 kHz
Internal Slow Start
Load Protected by Peak Current Limit and
Thermal Shutdown
Adjustable Undervoltage Lockout
The TPS5435x is a medium output current synchronous
buck PWM converter with an integrated high side
MOSFET and a gate driver for an optional low side
external MOSFET. Features include a high performance
voltage error amplifier that enables maximum
performance under transient conditions. The TPS5435x
has an under-voltage-lockout circuit to prevent start-up
until the input voltage reaches a preset value; an internal
slow-start circuit to limit in-rush currents; and a power good
output to indicate valid output conditions. The
synchronization feature is configurable as either an input
or an output for easy 180° out of phase synchronization.
D
D
D
D
D
D
D
D
The TPS5435x devices are available in a thermally
enhanced 16-pin TSSOP (PWP) PowerPAD package.
TI provides evaluation modules and the SWIFT Designer
software tool to aid in quickly achieving high-performance
power supply designs to meet aggressive equipment
development cycles.
D
D
16-Pin TSSOP PowerPADE Package
APPLICATIONS
D
D
D
D
Industrial & Commercial Low Power Systems
LCD Monitors and TVs
Computer Peripherals
Point of Load Regulation for High
Performance DSPs, FPGAs, ASICs and
Microprocessors
EFFICIENCY
vs
OUTPUT CURRENT
100
V
= 6 V
I
95
90
85
80
75
70
65
60
V
= 12 V
I
SIMPLIFIED SCHEMATIC
Input
Voltage
TPS54356
V = 12 V
I
O
SYNC
VIN
V
= 3.3 V
= 500 kHz
55
50
f
s
PWRGD
ENA
0
1
2
3
4
BOOT
PH
I
− Output Current − A
O
BIAS
Output
Voltage
LSG
PGND
VSENSE
PWRPAD
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 and SWIFT are trademarks of Texas Instruments.
ꢁꢖ ꢍ ꢛꢑ ꢔ ꢀꢏ ꢍꢐ ꢛ ꢒꢀꢒ ꢠꢡ ꢢꢣ ꢤ ꢟꢥ ꢦꢠꢣꢡ ꢠꢧ ꢨꢩ ꢤ ꢤ ꢪꢡꢦ ꢥꢧ ꢣꢢ ꢫꢩꢬ ꢭꢠꢨ ꢥꢦꢠ ꢣꢡ ꢮꢥ ꢦꢪꢊ ꢁꢤ ꢣꢮꢩ ꢨꢦꢧ
ꢨ ꢣꢡ ꢢꢣꢤ ꢟ ꢦꢣ ꢧ ꢫꢪ ꢨ ꢠ ꢢꢠ ꢨ ꢥ ꢦꢠ ꢣꢡꢧ ꢫ ꢪꢤ ꢦꢯꢪ ꢦꢪ ꢤ ꢟꢧ ꢣꢢ ꢀꢪꢰ ꢥꢧ ꢏꢡꢧ ꢦꢤ ꢩꢟ ꢪꢡꢦ ꢧ ꢧꢦ ꢥꢡꢮ ꢥꢤ ꢮ ꢱ ꢥꢤ ꢤ ꢥ ꢡꢦꢲꢊ
ꢁꢤ ꢣ ꢮꢩꢨ ꢦ ꢠꢣ ꢡ ꢫꢤ ꢣ ꢨ ꢪ ꢧ ꢧ ꢠꢡ ꢳ ꢮꢣ ꢪ ꢧ ꢡꢣꢦ ꢡꢪ ꢨꢪ ꢧꢧ ꢥꢤ ꢠꢭ ꢲ ꢠꢡꢨ ꢭꢩꢮ ꢪ ꢦꢪ ꢧꢦꢠ ꢡꢳ ꢣꢢ ꢥꢭ ꢭ ꢫꢥ ꢤ ꢥꢟ ꢪꢦꢪ ꢤ ꢧꢊ
Copyright 2004, Texas Instruments Incorporated