1 Features

1• High-Efficiency DC-DC Buck Converter

– Wide Input Voltage Range From 7 V to 75 V

– Adjustable Output Voltage as Low as 1.225 V

– Output Current as High as 2.5 A

– Junction Temperature Range –40°C to 125°C

• Integrated 75-V, 160-mΩ Buck MOSFET

• Meets EN55022 and CISPR 22 EMI Standards

• ±1.5% Feedback Voltage Accuracy

• Emulated Peak Current-Mode Control

– Ultra-Fast Line and Load Transient Response

• Switching Frequency From 50 kHz to 500 kHz

• Master or Slave Frequency Synchronization Input

• 80-ns Minimum PWM ON Time For Low VOUT

• Monotonic Start-up into Prebiased Output

• Internal High-Voltage VCC Bias Supply Regulator

• Auxiliary Bias Supply Option to VCC

• Configurable Soft Start With Tracking

• Precision Standby and Shutdown Input

– Programmable Input UVLO With Hysteresis

• Remote Shutdown and Standby Control

• Cycle-by-Cycle Overcurrent Protection

• VCC and Gate Drive UVLO Protection

• Thermal Shutdown Protection With Hysteresis

• Thermally-Enhanced 20-Pin HTSSOP Package

2 Applications

• High-Efficiency Point-of-Load Regulators

• Telecommunications Infrastructure

• Factory Automation and Control

3 Description

The LM5005 high-voltage buck converter features all

of the functions necessary to implement an efficient

high-voltage switching regulator with a minimum

number of external components. This easy-to-use

converter operates over an input voltage range from

7 V to 75 V and delivers a maximum output current of

2.5 A. The control loop architecture is based upon

current-mode control using an emulated current ramp

for high noise immunity. Current-mode control

provides inherent line feed-forward, cycle-by-cycle

overcurrent protection and straightforward loop

compensation. The use of an emulated control ramp

reduces noise sensitivity of the PWM circuit, allowing

reliable control of small duty cycles necessary in high

input voltage applications.

The switching frequency is resistor-programmable

from 50 kHz to 500 kHz. To reduce EMI, an oscillator

synchronization pin allows multiple LM5005

regulators to self-synchronize or be synchronized to

an external clock signal. Additional protection

features include configurable soft start, external

power supply tracking, thermal shutdown with

automatic recovery, and remote shutdown capability.

The LM5005 is available in an 20-pin HTSSOP

package with an exposed pad that is soldered to the

PCB to achieve a low junction-to-board thermal

impedance. To create a custom regulator design, use

the LM5005 with WEBENCH® Power Designer.