LM5010SD Datasheet, PDF (1/26 Pages) Texas Instruments – High-Voltage 1-A Step-Down Switching Regulator

LM5010
www.ti.com
SNVS307E – SEPTEMBER 2004 – REVISED FEBRUARY 2005
High-Voltage 1-A Step-Down Switching Regulator
Check for Samples: LM5010
FEATURES
1
•2 Input Voltage Range: 8V to 75V
• Valley Current Limit At 1.25A
• Switching Frequency Can Exceed 1 MHz
• Integrated N-Channel Buck Switch
• Integrated Startup Regulator
• No Loop Compensation Required
• Ultra-Fast Transient Response
• Operating Frequency Remains Constant With
Load and Line Variations
• Maximum Duty Cycle Limited During Startup
• Adjustable Output Voltage
• Precision 2.5V Feedback Reference
• Thermal shutdown
• Packages
– LLP-10 (4 mm x 4 mm)
– TSSOP-14EP
– Both Packages Have Exposed Thermal Pad
For Improved Heat Dissipation
APPLICATIONS
• High Efficiency Point-Of-Load (POL) Regulator
• Non-Isolated Telecommunications Buck
Regulator
• Secondary High Voltage Post Regulator
• Automotive Systems
DESCRIPTION
The LM5010 Step Down Switching Regulator features all the functions needed to implement a low cost, efficient,
buck bias regulator capable of supplying in excess of 1A load current. This high voltage regulator contains an N-
Channel Buck Switch, and is available in thermally enhanced LLP-10 and TSSOP-14EP packages. The
hysteretic regulation scheme requires no loop compensation, results in fast load transient response, and
simplifies circuit implementation. The operating frequency remains constant with line and load variations due to
the inverse relationship between the input voltage and the on-time. The valley current limit detection is set at
1.25A. Additional features include: V_CC under-voltage lockout, thermal shutdown, gate drive under-voltage
lockout, and maximum duty cycle limiter.
8V - 75V
Input
C1
SHUTDOWN
V_IN
V_CC
R_ON
LM5010
BST
R_ON / SD
SW
SS
I_SEN
C6
FB
RTN
S_GND
C3
C4
L1
D1
R1
R2
V_OUT
C2
Figure 1. Basic Step-Down Regulator
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.
All trademarks are the property of their respective owners.
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 © 2004–2005, Texas Instruments Incorporated