UCC2541 Controller Datasheet

UCC2541 Datasheet, PDF, Equivalent


Part Number

UCC2541

Description

High-Efficiency Ssynchronous Buck PWM Controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download UCC2541 Datasheet


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

UCC2541
UCC2541
ą
SLUS621A − AUGUST 2004 − SEPTEMBER 2005
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.
DESCRIPTION (CONT.)
The UCC2541 is available in the extended temperature range of –40°C to 105°C and is offered in thermally
enhanced PowerPADt 20-pin HTSSOP (PWP) or 32-pin quad flatpack (RHB) package. This space saving
package with standard 20-pin TSSOP footprint has a drastically lower thermal resistance of 1.4°C/W θJC to
accommodate the dual high-current drivers on board.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)(2)
UCC2541
UNIT
Supply voltage range, VDD
36 V
Supply current, IVDD
VDD
CEA−, COMP, G2C, RAMP, SS, TR, VEA−
50
−0.3 to 3.6
mA
VDRV
−0.3 to 9
Analog input voltages
G1, BST
SW, SWS
SW−0.3 to SW+9
−1 to 36
V
G2, G2S
−1 to 9
SYNCIN
−0.3 to 8.0
Sink current (peak), IOUT_SINK
Source current (peak), IOUT_SOURCE
G1, G2
G1, G2
3.5
−3.5
A
Operating junction temperature range, TJ
−55 to 150
Storage temperature, Tstg
−65 to 150
°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
300
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions”
is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to GND. Currents are positive into, and negative out of the specified terminal.
RECOMMENDED OPERATING CONDITIONS
Supply voltage, VDD
Supply voltage, VDRV
Supply voltage, REF
Supply voltage bypass, CVDD
Reference bypass capacitor, CREF
VDRV bypass capacitor, CVDRV
BST−SW bypass capacitor, CBST−SW
Timer current resistor range, RRSET
PWM ramp capacitor range, CRAMP
Turn-off capacitor range, CG2C
COMP pin load range, RLOAD
Junction operating temperature, TJ
Mode 1
Mode 2
Mode 3
MIN TYP MAX UNIT
8.5 35
4.75 9.00 V
3.0 3.3 3.6
1.0 2.2
0.1 1.0 2.2
µF
0.2
0.1
10 50 k
100 680
pF
120 1000
6.5 k
−40 105 °C
2 www.ti.com


Features UCC2541 ą SLUS621A − AUGUST 2004 − SEPTEMBER 2005 HIGHĆEFFICIENCY SYNCHR ONOUS BUCK PWM CONTROLLER FEATURES D O n-Chip Predictive Gate Drivet for High- Efficiency Synchronous Buck Operation D Dual ±3-A TrueDrivet Outputs D On-Boa rd Programmable Oscillator with 1-MHz F requency Operation D TR Input for Seque ncing Operation D Overcurrent Protectio n using a Parallel Average Current Mode Control Loop D 3 Modes to Support 2.7- V to 35-V Input Bias D Reverse Current Protection for Output Stage D User Prog rammable Shutdown Using SS Pin D ±1.0% Initial Tolerance Bandgap Reference D High Bandwidth Error Amplifiers D Therm ally Enhanced HTSSOP 20-Pin PowerPADt P ackage and QFN−32 Pin D Synchronizati on Input D Supports Pre-Bias Applicatio ns SIMPLIFIED APPLICATION DIAGRAM 1 RS ET UCC2541 SWS 20 2 REF BST 19 3 G2C G1 18 4 SYNCIN SW 17 5 RAMP VDD 1 6 6 GND PGND 15 7 VEA− G2 14 8 C EA− VDRV 13 9 COMP G2S 12 TR Inpu t 10 TR SS 11 APPLICATIONS D High Efficiency Non-Isolated Converters Requi.
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