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8
SLVS612 − APRIL 2006
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FEATURES
CONTENTS
D
D
D
D
Operating Input Voltage 10 V to 40 V
Device Ratings
2
3
5
7
22
29
Output Voltage Tracks External Reference
Electrical Characteristics
Terminal Information
Application Information
Design Example
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
Additional References
D
D
D
D
D
Externally Synchronizable
Programmable Short-Circuit Protection
Thermal Shutdown
DESCRIPTION
The 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) MOSFETs. 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.
16-Pin PowerPADt Package (θ = 2°C/W)
JC
Programmable Closed-Loop Soft-Start
APPLICATIONS
D
D
D
D
DDR Tracking Regulators
Power Modules
Networking Equipment
Industrial Servers
SIMPLIFIED APPLICATION DIAGRAM
+
TPS40056PWP
V
−
IN
1
2
3
4
5
6
7
8
SYNC
16
15
ILIM
VIN
RT
BP5
BOOST 14
EA_REF HDRV 13
V
TRKIN
12
SGND
SS
SW
+
BP10 11
LDRV 10
VFB
V
−
TT
COMP PGND
PAD
9
UDG−03080
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Copyright 2006, Texas Instruments Incorporated
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ꢠ ꢤ ꢡ ꢠꢙ ꢚꢮ ꢜꢛ ꢟ ꢧꢧ ꢥꢟ ꢝ ꢟ ꢞ ꢤ ꢠ ꢤ ꢝ ꢡ ꢩ
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1
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