LM43600-Q1 Converter Datasheet

LM43600-Q1 Datasheet, PDF, Equivalent


Part Number

LM43600-Q1

Description

0.5-A Synchronous Step-Down Voltage Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM43600-Q1
SNVSA99C – JULY 2015 – REVISED NOVEMBER 2017
LM43600-Q1 3.5-V to 36-V, 0.5-A Synchronous Step-Down Voltage Converter
1 Features
1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
• 33-µA Quiescent Current in Regulation
• High Efficiency at Light Load (DCM and PFM)
• Tested to EN55022/CISPR 22 EMI standards
• Integrated Synchronous Rectification
• Adjustable Frequency Range: 200 kHz to 2.2 MHz
(500 kHz Default)
• Frequency Synchronization to External Clock
• Internal Compensation
• Stable with Almost Any Combination of Ceramic,
Polymer, Tantalum, and Aluminum Capacitors
• Power-Good Flag
• Soft Start into Pre-Biased Load
• Internal Soft Start: 4.1 ms
• Extendable Soft-Start Time by External Capacitor
• Output Voltage Tracking Capability
• Precision Enable to Program System UVLO
• Output Short-Circuit Protection with Hiccup Mode
• Overtemperature Thermal Shutdown Protection
• Create a Custom Design Using the LM43600-Q1
With the WEBENCH® Power Designer
2 Applications
• Sub-AM Band Automotive
• Telecommunications Systems
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation
3 Description
The LM43600-Q1 regulator is an easy-to-use
synchronous step-down DC-DC converter capable of
driving up to 0.5 A of load current from an input
voltage ranging from 3.5 V to 36 V (42 V transient).
The LM43600-Q1 provides exceptional efficiency,
output accuracy and dropout voltage in a very small
solution size. An extended family is available in 1 A, 2
A, and 3 A load current options in pin-to-pin
compatible packages. Peak current mode control is
employed to achieve simple control loop
compensation and cycle-by-cycle current limiting.
Optional features such as programmable switching
frequency, synchronization, power-good flag,
precision enable, internal soft start, extendable soft
start, and tracking provide a flexible and easy to use
platform for a wide range of applications.
Discontinuous conduction and automatic frequency
modulation at light loads improve light load efficiency.
The family requires few external components and pin
arrangement allows simple, optimum PCB layout.
Protection features include thermal shutdown, VCC
undervoltage lockout, cycle-by-cycle current limit, and
output short-circuit protection. The LM43600-Q1
device is available in the 16-pin, leaded HTSSOP
(PWP) package (6.6 mm × 5.1 mm × 1.2 mm) with
0.65-mm lead pitch. The device is pin-to-pin
compatible with the LM4360x and LM4600x families.
The LM43600A-Q1 version is optimized for PFM
operation and recommended for new designs.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM43600-Q1,
LM43600A-Q1
HTSSOP (16)
6.60 mm × 5.10 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
Radiated Emission (VIN = 12 V, VOUT = 3.3 V
FS = 500 kHz, IOUT = 0.5 A)
dBuV
80
70
60
50
40
30
20
10
30
Vertical Polarization
Horizontal Polarization
EN 55022 Class B Limit
Evaluation Board Emissions
100
Frequency (MHz)
1000
VIN
CIN
Simplified Schematic
VIN SW
LM43600-Q1
L
CBOOT
VOUT
COUT
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
CBIAS
CFF
RFBT
CVCC
RFBB
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.

LM43600-Q1
LM43600-Q1
SNVSA99C – JULY 2015 – REVISED NOVEMBER 2017
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 Timing Requirements ................................................ 7
6.7 Switching Characteristics .......................................... 7
6.8 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 14
7.3 Feature Description................................................. 15
7.4 Device Functional Modes........................................ 23
8 Applications and Implementation ...................... 25
8.1 Application Information............................................ 25
8.2 Typical Applications ................................................ 25
9 Power Supply Recommendations...................... 42
10 Layout................................................................... 42
10.1 Layout Guidelines ................................................. 42
10.2 Layout Example .................................................... 45
11 Device and Documentation Support ................. 46
11.1 Development Support ........................................... 46
11.2 Receiving Notification of Documentation Updates 46
11.3 Community Resources.......................................... 46
11.4 Trademarks ........................................................... 46
11.5 Electrostatic Discharge Caution ............................ 46
11.6 Glossary ................................................................ 46
12 Mechanical, Packaging, and Orderable
Information ........................................................... 46
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (September 2017) to Revision C
Page
• Added LM43600A-Q1 information on page 1 ........................................................................................................................ 1
• Added RPGOOD values for LM43600A-Q1 ............................................................................................................................... 6
Changes from Revision A (August 2015) to Revision B
Page
• No technical changes; editorial only ...................................................................................................................................... 1
• Added links for WEBENCH ................................................................................................................................................... 1
Changes from Original (July 2015) to Revision A
Page
• Changed from Preview to Production Data ............................................................................................................................ 1
2 Submit Documentation Feedback
Product Folder Links: LM43600-Q1
Copyright © 2015–2017, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LM43600-Q1 SNVSA99C – JULY 20 15 – REVISED NOVEMBER 2017 LM43600-Q1 3.5-V to 36-V, 0.5-A Synchronous Step- Down Voltage Converter 1 Features •1 Qualified for Automotive Applications • AEC-Q100 Qualified With the Followi ng Results: – Device Temperature Grad e 1: –40°C to +125°C Ambient Operat ing Temperature • 33-µA Quiescent Cu rrent in Regulation • High Efficiency at Light Load (DCM and PFM) • Tested to EN55022/CISPR 22 EMI standards • Integrated Synchronous Rectification Adjustable Frequency Range: 200 kHz t o 2.2 MHz (500 kHz Default) • Frequen cy Synchronization to External Clock Internal Compensation • Stable with Almost Any Combination of Ceramic, Pol ymer, Tantalum, and Aluminum Capacitors • Power-Good Flag • Soft Start int o Pre-Biased Load • Internal Soft Sta rt: 4.1 ms • Extendable Soft-Start Ti me by External Capacitor • Output Voltage Tracking Capability • Precision Enable to Program System UVL.
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