LM5010 High Voltage 1A Step Down Switching Regulator

General 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.

Features

• 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

Typical Applications

• High Efficiency Point-Of-Load (POL) Regulator
• Non-Isolated Telecommunications Buck Regulator
• Secondary High Voltage Post Regulator
• Automotive Systems

Package

• LLP-10 (4 mm x 4 mm)
• TSSOP-14EP
• Both Packages Have Exposed Thermal Pad For Improved Heat Dissipation

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

V_IN to GND                                                                                     76V

BST to GND                                                                                   90V

SW to GND (Steady State)                                                          -1.5V

BST to V_CC                                                                                   76V

BST to SW                                                                                     14V

V_CC to GND                                                                                  14V

S_GND to RTN                                                                -0.3V to +0.3V

SS to RTN                                                                          -0.3V to 4V

V_IN to SW                                                                                      76V

Current Out of I_SEN                                                               See Text

All Other Inputs to GND                                                        -0.3 to 7V

ESD Rating (Note 2) Human Body Model                                      2kV

Storage Temperature Range                                     -55˚C to +150˚C

Lead Temperature (Soldering 4 sec) (Note 4)                           260˚C

Operating Ratings (Note 1)

V_IN                                                                                         8V to 75V

Operating Junction Temperature                               −40˚C to + 125˚C

Connection Diagrams

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