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6,4 mm y 5,0 mm
TPS54352, TPS54353 TPS54354, TPS54355 TPS54356, TPS54357
SLVS519A − MAY 2004 − REVISED OCTOBER 2004
4.5ĆV TO 20ĆV INPUT, 3ĆA OUTPUT SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FET (SWIFT)
FEATURES D 100 mΩ, 4.5-A Peak MOSFET Switch for High
Efficiency at 3-A Continuous Output Current
D Uses External Lowside MOSFET or Diode D Fixed Output Versions −
1.2V/1.5V/1.8V/2.5V/3.3V/5.0V
D Internally Compensated for Low Parts Count D Synchronizes to External Clock D 1805 Out of Phase Synchronization D Wide PWM Frequency − Fixed 250 kHz,
500 kHz or Adjustable 250 kHz to 700 kHz
D Internal Slow Start D Load Protected by Peak Current Limit and
Thermal Shutdown
D Adjustable Undervoltage Lockout D 16-Pin TSSOP PowerPADE Package
APPLICATIONS D Industrial & Commercial Low Power Systems D LCD Monitors and TVs D Computer Peripherals D Point of Load Regulation for High
Performance DSPs, FPGAs, ASICs and
Microprocessors
SIMPLIFIED SCHEMATIC
TPS54356
SYNC
VIN
PWRGD ENA
BIAS
BOOT PH
LSG
PGND VSENSE
PWRPAD
Input Voltage
Output Voltage
DESCRIPTION
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.
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.
Efficiency − %
100 95 90 85 80 75 70 65 60 55 50 0
EFFICIENCY vs
OUTPUT CURRENT
VI = 6 V VI = 12 V
VI= 12 V VO= 3.3 V fs = 500 kHz
1
2
3
4
IO − Output Current − A
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.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright 2004, Texas Instruments Incorporated
TPS54352, TPS54353 TPS54354, TPS54355 TPS54356, TPS54357
SLVS519A − MAY 2004 − REVISED OCTOBER 2004
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.
ORDERING INFORMATION
TA
OUTPUT VOLTAGE
PACKAGE
PART NUMBER
1.2 V
Plastic HTSSOP (PWP)
TPS54352PWP
1.5 V
Plastic HTSSOP (PWP)
TPS54353PWP
−40°C to 85°C
1.8 V 2.5 V
Plastic HTSSOP (PWP) Plastic HTSSOP (PWP)
TPS54354PWP TPS54355PWP
3.3 V
Plastic HTSSOP (PWP)
TPS54356PWP
5.0 V
Plastic HTSSOP (PWP)
TPS54357PWP
(1) The PWP package is also available taped and reeled. Add an R suffix to the device type (i.e. TPS5435xPWPR).
PACKAGE DISSIPATION RATINGS(1)
PACKAGE
THERMAL IMPEDANCE JUNCTION-TO-AMBIENT
TA = 25°C POWER RATING
16-Pin PWP with solder(2)
42.1°C/W
2.36
16-Pin PWP without solder
151.9°C/W
0.66
(1) See Figure 47 for power dissipation curves. (2) Test Board Conditions
1. Thickness: 0.062”
2. 3” x 3”
3. 2 oz. Copper traces located on the top and bottom of the PCB for soldering
4. Copper areas located on the top and bottom of the PCB for soldering
5. Power and ground planes, 1 oz. copper (0.036 mm thick)
6. Thermal vias, 0.33 mm diameter, 1.5 mm pitch
7. Thermal isolation of power plane
For more information, refer to TI technical brief SLMA002.
TA = 70°C POWER RATING
1.31
0.36
TA = 85°C POWER RATING
0.95
0.26
2
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TPS54352, TPS54353 TPS54354, TPS54355 TPS54356, TPS54357
SLVS519A − MAY 2004 − REVISED OCTOBER 2004
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
VIN
VSENSE
Input voltage range, VI
UVLO SYNC
ENA
BOOT
VBIAS
LSG
SYNC
Output voltage range, VO
RT PWRGD
COMP
PH
PH
Source current, IO
LSG (Steady State Current) COMP, VBIAS
SYNC
LSG (Steady State Current)
Sink current, IS
PH (Steady State Current) COMP
ENA, PWRGD
Voltage differential
AGND to PGND
Operating virtual junction temperature range, TJ Storage temperature, Tstg Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
UNIT −0.3 V to 21.5 V −0.3 V to 8.0 V −0.3 V to 8.0.