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SLUS621A − AUGUST 2004 − SEPTEMBER 2005
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ꢔꢕ ꢖ ꢁꢑ ꢍꢗ ꢐꢑ ꢘ ꢘꢋ ꢐ
FEATURES
APPLICATIONS
D
On-Chip Predictive Gate Drivet for
High-Efficiency Synchronous Buck
Operation
D
High Efficiency Non-Isolated Converters
Requiring Advanced Features such as
Pre-Bias Support and Tracking Capability
D
D
Dual 3-A TrueDrivet Outputs
D
D
Point-of-Load Modules for Servers, Telecom,
and Data communication Equipments
On-Board Programmable Oscillator with
1-MHz Frequency Operation
Good for Input Voltages of 3.3 V, 5.0 V,
12.0 V, or Intermediate Bus Voltages
D
TR Input for Sequencing Operation
D
Overcurrent Protection using a Parallel
Average Current Mode Control Loop
DESCRIPTION
The UCC2541 is a synchronous buck PWM
controller for high current and low output voltage
applications.
D
D
D
D
D
D
3 Modes to Support 2.7-V to 35-V Input Bias
Reverse Current Protection for Output Stage
User Programmable Shutdown Using SS Pin
1.0% Initial Tolerance Bandgap Reference
High Bandwidth Error Amplifiers
For higher efficiency, it incorporates the Predictive
Gate Drivet technology that virtually eliminates
body diode conduction losses in synchronous
rectifiers.
Thermally Enhanced HTSSOP 20-Pin
PowerPADt Package and QFN−32 Pin
D
Synchronization Input
D
Supports Pre-Bias Applications
SIMPLIFIED APPLICATION DIAGRAM
UCC2541
1
RSET
20
SWS
VIN
2
BST 19
REF
3
18
17
G2C
G1
4
SYNCIN
RAMP
SW
5
VDD 16
VOUT
6
GND
VEA−
CEA−
COMP
TR
15
14
13
12
11
PGND
G2
7
8
VDRV
G2S
9
TR Input
10
SS
Predictive Gate Drive, TrueDrive and PowerPAD are trademarks of Texas Instruments Incorporated.
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Copyright 2004, Texas Instruments Incorporated
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www.ti.com