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TPS40056PWP
Wide Vin (10V-40V) Synchronous Buck DC/DC Controller with Tracking
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SLVS612 − APRIL 2006
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FEATURES Operating Input Voltage 10 V to 40 V Output Voltage Tracks External Reference Programmable Fixed-Frequency Up to
100 kHz to 1 MHz Voltage Mode Controller Internal Gate Drive Outputs for High-Side
and Synchronous N-Channel MOSFETs Externally Synchronizable Programmable Short-Circuit Protection Thermal Shutdown 16-Pin PowerPAD� Package (θJC = 2°C/W) Programmable Closed-Loop Soft-Start
APPLICATIONS DDR Tracking Regulators Power Modules Networking Equipment Industrial Servers
CONTENTSDevice Ratings 2
Electrical Characteristics 3
Terminal Information 5
Application Information 7
Design Example 22
Additional References 29
DESCRIPTIONThe TPS40056 is part of a family of high-voltage,
wide input, synchronous, step-down converters.
The TPS40056 offers design flexibility with a
variety of user programmable functions, including
soft-start, operating frequency, high-side current
limit, and loop compensation. The TPS40056 is
also synchronizable to an external supply. It
incorporates MOSFET gate drivers for external
N-channel high-side and synchronous rectifier
(SR) MOSFET s. Gate drive logic incorporates
anti-cross conduction circuitry to prevent
simultaneous high-side and synchronous rectifier
conduction. The externally programmable short
circuit protection provides pulse-by-pulse current
limit, as well as hiccup mode operation utilizing an
internal fault counter for longer duration
overloads.
SIMPLIFIED APPLICATION DIAGRAM
VTT
VIN
VTRKINUDG−03080
