TPS40042 Datasheet, PDF (1/35 Pages) Texas Instruments – LOW PIN COUNT, LOW VIN (3.0 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH EXTERNAL REFERENCE INPUT

TPS40042
www.ti.com
SLUS777 – NOVEMBER 2007
LOW PIN COUNT, LOW V_IN (3.0 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC
CONTROLLER WITH EXTERNAL REFERENCE INPUT
FEATURES
1
•2 3.0-V to 5.5-V Input
• External Reference required: 0.5 V to 1.5 V
• Output Voltage from REFIN to 90% of VIN
• High-Side Drive for N-Channel FET
• Supports Pre-Biased Outputs
• Adaptive Anti-Cross Conduction Gate Drive
• Fixed switching frequency (600 kHz) Voltage
Mode Control
• Three Selectable Short Circuit Protection
Levels
• Hiccup Restart from Faults
• Active Low Enable
• Thermal Shutdown Protection at 145°C
• 10-Pin, 3-mm x 3-mm SON (DRC)
APPLICATIONS
• DDR Memory
• Point of Load
• Telecommunications
• DC to DC Modules
CONTENTS
Device Ratings
2
Electrical Characteristics
4
Device Information
8
Application Information
10
Design Examples
18
Additional References
28
DESCRIPTION
The TPS40042 DC/DC controller is designed to
operate with an input source between a 3.0 V and 5.5
V. To reduce the number of external components, a
number of operating parameters are fixed internally.
The operating frequency for example, is internally set
at 600 kHz. (Continued)
V_IN
Reference Input
Enable
TPS40042
1 REFIN
HDRV 10
2 EN
SW 9
3 FB
BOOT 8
4 COMP
LDRV 7
5 VDD
GND 6
V_OUT
UDG-07141
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.
Predictive Gate Drive is a registered trademark of Texas Instruments.
2
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 © 2007, Texas Instruments Incorporated