LM43602-Q1 Converter Datasheet

LM43602-Q1 Datasheet, PDF, Equivalent


Part Number

LM43602-Q1

Description

2-A Synchronous Step-Down Voltage Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM43602-Q1
SNVSA83C – APRIL 2015 – REVISED OCTOBER 2017
LM43602-Q1 3.5-V to 36-V, 2-A Synchronous Step-Down Voltage Converter
1 Features
1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 2: –40°C to
+125°C Ambient Operating Temperature
• 27-µA Quiescent Current in Regulation
• High Efficiency at Light Load (DCM and PFM)
• Meets 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 a 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 LM43602-Q1
With the WEBENCH® Power Designer
2 Applications
• Sub-AM Band Automotive
• Industrial Power Supplies
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation
• Telecommunications Systems
Simplified Schematic
VIN
CIN
VIN SW
LM43602Q
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
CBOOT
COUT
VOUT
CBIAS
CFF
RFBT
CVCC
RFBB
C001
3 Description
The LM43602-Q1 regulator is an easy-to-use
synchronous step-down DC-DC converter capable of
driving up to 2 A of load current from an input voltage
ranging from 3.5 V to 36 V (42 V abs maximum). The
LM43602-Q1 provides exceptional efficiency, output
accuracy and dropout voltage in a very small solution
size. An extended family is available in 0.5-A , 1-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 LM43602-Q1 device is available in
the HTSSOP (PWP) 16-pin leaded package (6.6 mm
× 5.1 mm × 1.2 mm).The LM43602A-Q1 version is
optimized for PFM operation and recommended for
new designs. The device is pin-to-pin compatible with
LM4360x and LM4600x family.
PART NUMBER
LM43602-Q1
LM43602A-Q1
Device Information
PACKAGE
BODY SIZE
HTSSOP (16)
6.60 mm × 5.10 mm
HTSSOP (16)
6.60 mm × 5.10 mm
space
space
Radiated Emission Graph
12VIN to 3.3 VOUT FS = 500 kHz IOUT = 2 A
80
Evaluation Board
70 EN 55022 Class B Limit
60 EN 55022 Class A Limit
50
40
30
20
10
0
0 200 400 600 800 1000
Frequency (MHz)
C001
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.

LM43602-Q1
LM43602-Q1
SNVSA83C – APRIL 2015 – REVISED OCTOBER 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 ................................................ 6
6.7 Switching Characteristics .......................................... 7
6.8 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 12
7.3 Feature Description................................................. 13
7.4 Device Functional Modes........................................ 20
8 Applications and Implementation ...................... 22
8.1 Application Information............................................ 22
8.2 Typical Applications ................................................ 22
9 Power Supply Recommendations...................... 33
10 Layout................................................................... 33
10.1 Layout Guidelines ................................................. 33
10.2 Layout Example .................................................... 36
11 Device and Documentation Support ................. 37
11.1 Device Support...................................................... 37
11.2 Development Support ........................................... 37
11.3 Receiving Notification of Documentation Updates 37
11.4 Community Resources.......................................... 37
11.5 Trademarks ........................................................... 38
11.6 Electrostatic Discharge Caution ............................ 38
11.7 Glossary ................................................................ 38
12 Mechanical, Packaging, and Orderable
Information ........................................................... 38
4 Revision History
Changes from Revision B (April 2017) to Revision C
Page
• Added top navigator icon for TI reference design .................................................................................................................. 1
• Changed MAX value for VBIAS rising threshold from "3.16" to "3.18" V ............................................................................... 5
Changes from Revision A (May 2015) to Revision B
Page
• Added links for WEBENCH ................................................................................................................................................... 1
• Added LM43602A-Q1 version ................................................................................................................................................ 1
• Added Maximum Operating Junction Temperature ............................................................................................................... 4
• Updating RPGOOD value for EN = 3.3V and EN = 0V ......................................................................................................... 6
• Updating EN Falling Threshold Curve ................................................................................................................................. 10
• Updating EN Rising Threshold Curve ................................................................................................................................. 10
• Updating EN Hysteresis Curve ............................................................................................................................................ 10
• Added Equation 25 .............................................................................................................................................................. 28
• Added Equation 26 .............................................................................................................................................................. 28
Changes from Original (April 2015) to Revision A
Page
• Changed device from Product Preview to Production Data ................................................................................................... 1
• Deleted "Super-AM Band" ..................................................................................................................................................... 1
• Added "BIAS pin voltage should not exceed VIN" to BIAS pin description ........................................................................... 3
• Added TYPE column to Pin Functions table ......................................................................................................................... 3
• Added "of 10000 hours" to FN 2 of table ............................................................................................................................... 4
• Changed info in Vfb rows; in ILKG-FB changed value of from FB=1.011 V to 1.015 V ....................................................... 6
• Changed The internal REF voltage is "1.011 V" to "1.015 V" .............................................................................................. 14
• Changed VFB = "1.011 V" to "1.015 V" ................................................................................................................................ 24
2 Submit Documentation Feedback
Product Folder Links: LM43602-Q1
Copyright © 2015–2017, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design LM43602-Q1 SN VSA83C – APRIL 2015 – REVISED OCTOB ER 2017 LM43602-Q1 3.5-V to 36-V, 2-A S ynchronous Step-Down Voltage Converter 1 Features •1 Qualified for Automoti ve Applications • AEC-Q100 Qualified With the Following Results: – Device Temperature Grade 2: –40°C to +125° C Ambient Operating Temperature • 27- µA Quiescent Current in Regulation • High Efficiency at Light Load (DCM and PFM) • Meets EN55022/CISPR 22 EMI St andards • Integrated Synchronous Rect ification • Adjustable Frequency Rang e: 200 kHz to 2.2 MHz (500 kHz default) • Frequency Synchronization to Exter nal Clock • Internal Compensation • Stable with Almost Any Combination of Ceramic, Polymer, Tantalum, and Aluminu m Capacitors • Power-Good Flag • So ft Start into a Pre-Biased Load • Int ernal Soft Start: 4.1 ms • Extendable Soft-Start Time by External Capacitor • Output Voltage Tracking Capability • Precision Enable to Prog.
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