TPS54550_15 Datasheet, PDF (1/32 Pages) Texas Instruments – 4.5-V TO 20-V INPUT, 6-A OUTPUT SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FET (SWIFT™)

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6,4 mm y 5,0 mm
TPS54550
SLVS623A – MARCH 2006 – REVISED APRIL 2006
4.5-V TO 20-V INPUT, 6-A OUTPUT SYNCHRONOUS PWM
SWITCHER WITH INTEGRATED FET (SWIFT™)
FEATURES
• 40 mΩ MOSFET Switch for High Efficiency at
6-A (7.5 Peak) Output Current
• Uses External Lowside MOSFET
• Output Voltage Adjustable Down to 0.891 V
With 1% Accuracy
• Synchronizes to External Clock
• 180° Out of Phase Synchronization
• Wide PWM Frequency—Fixed 250 kHz,
500 kHz or Adjustable 250 kHz to 700 kHz
• Adjustable Slow Start
• Adjustable Undervoltage Lockout
• Load Protected by Peak Current Limit and
Thermal Shutdown
• 16-Pin TSSOP PowerPAD™ Package
• SWIFT Documentation Application Notes, and
Design Software: www.ti.com/swift
APPLICATIONS
• Industrial and Commercial Low Power
Systems
• LCD Monitors and TVs
• Computer Peripherals
• Point of Load Regulation for
High-Performance DSPs, FPGAs, ASICs and
Microprocessors
Simplified Schematic
TPS54550
SYNC
VIN
PWRGD
SS/ENA
VBIAS
BOOT
COMP
PH
LSG
VSENSE PGND
PWRPAD
Input
Voltage
Output
Voltage
DESCRIPTION
The TPS54550 is a medium output current
synchronous buck PWM converter with an integrated
high-side MOSFET and a gate driver for an low-side
external MOSFET. Features include a
high-performance voltage error amplifier that enables
maximum performance under transient conditions
and flexibility in choosing the output filter inductors
and capacitors. The TPS54550 has an undervoltage
lockout circuit to prevent start-up until the input
voltage reaches 4.5 V; a 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 TPS54550 device is 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.
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100
95
90
85
80
75
70
65
60
55
50
0
EFFICIENCY
vs
OUTPUT CURRENT
V_I = 9 V,
V_O = 3.3 V,
f_sw = 700 kHz
1
2
3
4
5
6
I_O - 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.
SWIFT, PowerPAD are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
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 © 2006, Texas Instruments Incorporated