Output Current (A)
Efficiency ()
0 0.5 1 1.5 2 2.5
20
30
40
50
60
70
80
90
100
D001
VIN = 12 V
VIN = 24 V
VIN = 36 V
VIN = 48 V
VIN = 60 V
VIN = 75 V
FB
VIN
LM5005
VOUT
AGND
COMP
VIN
SYNC
SW
SD LF
RC1
CC1
CC2
RFB1
RFB2
PGND
VCC
5
17,18
2
7
6
10
13,14
3,4
SS
CSS
11
CIN
COUT
optional
CVCC
1
IS 15,16
RT
RT
8
CRAMP
RAMP
9
CBST
OUT 12
BST 20
DF
PRE 19
optional
SYNC
Copyright © 2016, Texas Instruments Incorporated
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM5005
SNVS397E –SEPTEMBER 2005–REVISED NOVEMBER 2016
LM5005 75-V, 2.5-A Step-Down Switching Regulator With Wide Input Voltage Range
1
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-mΩBuck 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
SPACER
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.
Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LM5005 HTSSOP (20) 6.50 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit Typical Efficiency, VOUT =5V