TPS40303 Datasheet, PDF (1/29 Pages) Texas Instruments – 3-V TO 20-V INPUT SYNCHRONOUS BUCK CONTROLLER

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TPS40303, TPS40304, TPS40305
SLUS964 – NOVEMBER 2009
3-V TO 20-V INPUT SYNCHRONOUS BUCK CONTROLLER
Check for Samples :TPS40303 TPS40304 TPS40305
FEATURES
1
CONTENTS
• Input Voltage Range from 3 V to 20 V
Device Ratings
2
• 300 KHz (TPS40303), 600 KHz (TPS40304) and
1.2 MHz (TPS40305) Switching Frequencies
Electrical Characteristics
3
Device Information
8
• High- and Low-Side FET R_DS(on) Current
Sensing
Application Information
10
Design Examples
14
• Programmable Thermally Compensated OCP
Levels
Additional References
24
X
• Programmable Soft-Start
• 600 mV, 1% Reference Voltage
• Voltage Feed-Forward Compensation
• Supports Pre-Biased Output
• Frequency Spread Spectrum
• Thermal Shutdown Protection at 145°C
• 10-Pin 3 mm × 3 mm SON Package with
Ground Connection to Thermal Pad
APPLICATIONS
• POL Modules
• Printer
• Digital TV
• Telecom
DESCRIPTION
The TPS4030x is a family of cost-optimized synchronous buck controllers that operate from 3-V to 20-V input.
The controller implements a voltage-mode control architecture with input-voltage feed-forward compensation that
responds instantly to input voltage change. The switching frequency is fixed at 300 KHz, 600 KHz or 1.2 MHz.
Frequency Spread Spectrum feature adds dither to the switching frequency, significantly reducing the peak EMI
noise and making it much easier to comply with EMI standards.
The TPS4030x offers design with a variety of user programmable functions, including soft-start, Over- Current
Protection (OCP) levels, and loop compensation.
OCP level may be programmed by a single external resistor connected from LDRV pin to circuit ground. During
initial power on, the TPS4030x enters a calibration cycle, measures the voltage at the LDRV pin, and sets an
internal OCP voltage level. During operation, the programmed OCP voltage level is compared to the voltage drop
across the low side FET when it is on to determine whether there is an overcurrent condition. The TPS4030x
then enters a shutdown and restart cycle until the fault is removed.
SIMPLIFIED APPLICATION DIAGRAM
V
OUT
SD
V_IN
TPS4030x
5 FB
BOOT 6
4 COMP HDRV 7
3 PGOOD
SW 8
2 EN/SS LDRV/OC 9
1 VDD
GND
PAD
BP 10
V
IN
V
OUT
UDG-09158
1
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.
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 © 2009, Texas Instruments Incorporated