converter. LM5164-Q1 Datasheet

LM5164-Q1 Datasheet PDF


Part

LM5164-Q1

Description

100-V Input 1-A synchronous buck DC/DC converter

Manufacture

etcTI

Page 30 Pages
Datasheet
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LM5164-Q1 Datasheet
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LM5164-Q1
SNVSB51A – SEPTEMBER 2018 – REVISED MARCH 2019
LM5164-Q1 100-V Input, 1-A synchronous buck DC/DC converter with ultra-low IQ
1 Features
1 AEC-Q100-qualified for automotive applications
– Device temperature grade 1: –40°C to +125°C,
ambient temperature range
• Designed for reliable and rugged applications
– Wide input voltage range of 6 V to 100 V
– Junction temperature range: –40°C to +150°C
– Fixed 3-ms internal soft-start timer
– Peak and valley current-limit protection
– Input UVLO and thermal shutdown protection
• Suited for scalable automotive power supplies
– Low minimum on- and off-times of 50 ns
– Adjustable switching frequency up to 1 MHz
– Diode emulation for high light-load efficiency
– 10.5-µA no-load input quiescent current
– 3-µA shutdown quiescent current
– Optimized for CISPR 25 EMI standard
• Integration reduces solution size and cost
– COT mode control architecture
– Integrated 0.725-Ω NFET buck switch supports
wide duty cycle range
– Integrated 0.34-Ω NFET synchronous rectifier
eliminates external Schottky diode
– 1.2-V internal voltage reference
– No loop compensation components
– Internal VCC bias regulator and boot diode
• Create a custom design using WEBENCH® power
designer
2 Applications
• Automotive 48-V mild hybrid ECU bias supplies
• Automotive DC/DC converters
• Automotive HVAC compressors and PTC heaters
3 Description
The LM5164-Q1 synchronous buck converter is
designed to regulate over a wide input voltage range,
minimizing the need for external surge suppression
components. A minimum controllable on-time of 50 ns
facilitates large step-down conversion ratios, enabling
the direct step-down from a 48-V nominal input to
low-voltage rails for reduced system complexity and
solution cost. The LM5164-Q1 operates during input
voltage dips as low as 6 V, at nearly 100% duty cycle
if needed, making it an excellent choice for high-
performance 48-V battery automotive applications
and MHEV/EV systems.
With integrated high-side and low-side power
MOSFETs, the LM5164-Q1 delivers up to 1-A of
output current. A constant on-time (COT) control
architecture provides nearly constant switching
frequency with excellent load and line transient
response. Additional features of the LM5164-Q1
include ultra-low IQ and diode emulation mode
operation for high light-load efficiency, innovative
peak and valley overcurrent protection, integrated
VCC bias supply and bootstrap diode, precision
enable and input UVLO, and thermal shutdown
protection with automatic recovery. An open-drain
PGOOD indicator provides sequencing, fault
reporting, and output voltage monitoring.
The LM5164-Q1 is qualified to automotive AEC-Q100
grade 1 and is available in a 8-pin SO PowerPAD™
package. Its 1.27-mm pin pitch provides adequate
spacing for high-voltage applications.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM5164-Q1
SO PowerPAD (8) 4.89 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN = 6 V...100 V
CIN
2.2 µF
RRON
100 k:
Typical Application
U1
VIN SW
LM5164-Q1
EN/UVLO BST
LO
68 µH
CBST
2.2 nF RFB1
448 k:
RON
FB
GND PGOOD
RFB2
49.9 k:
VOUT = 12 V
IOUT = 1 A
COUT
47 µF
*VOUT tracks VIN if VIN < 12 V
1
Typical Application Efficiency, VOUT = 12 V
100
90
80
70
60
50
40
30
0.001
0.01
0.1
Load (A)
VIN = 14V
VIN = 24V
VIN = 48V
VIN = 72V
1
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.

LM5164-Q1 Datasheet
LM5164-Q1
SNVSB51A – SEPTEMBER 2018 – REVISED MARCH 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics ............................................. 7
7 Detailed Description .............................................. 9
7.1 Overview .................................................................. 9
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 15
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application .................................................. 16
9 Power Supply Recommendations...................... 22
10 Layout................................................................... 23
10.1 Layout Guidelines ................................................. 23
10.2 Layout Example .................................................... 25
11 Device and Documentation Support ................. 26
11.1 Device Support...................................................... 26
11.2 Related Documentation ....................................... 26
11.3 Receiving Notification of Documentation Updates 27
11.4 Community Resources.......................................... 27
11.5 Trademarks ........................................................... 27
11.6 Electrostatic Discharge Caution ............................ 27
11.7 Glossary ................................................................ 27
12 Mechanical, Packaging, and Orderable
Information ........................................................... 27
4 Revision History
Changes from Original (September 2018) to Revision A
Page
• First release of production-data data sheet............................................................................................................................ 1
2 Submit Documentation Feedback
Product Folder Links: LM5164-Q1
Copyright © 2018–2019, Texas Instruments Incorporated


Features Datasheet pdf Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM5164-Q1 SNVSB51A – SEPTEMBE R 2018 – REVISED MARCH 2019 LM5164-Q 1 100-V Input, 1-A synchronous buck DC/ DC converter with ultra-low IQ 1 Featu res •1 AEC-Q100-qualified for automot ive applications – Device temperature grade 1: –40°C to +125°C, ambient temperature range • Designed for reli able and rugged applications – Wide i nput voltage range of 6 V to 100 V – Junction temperature range: –40°C to +150°C – Fixed 3-ms internal soft-s tart timer – Peak and valley current- limit protection – Input UVLO and the rmal shutdown protection • Suited for scalable automotive power supplies – Low minimum on- and off-times of 50 ns – Adjustable switching frequency up to 1 MHz – Diode emulation for high l ight-load efficiency – 10.5-µA no-lo ad input quiescent current – 3-µA sh utdown quiescent current – Optimized for CISPR 25 EMI standard • Integration reduces solution size and cost – COT mode control architecture – In.
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