LM43601 Converter Datasheet

LM43601 Datasheet, PDF, Equivalent


Part Number

LM43601

Description

1-A Synchronous Step-Down Voltage Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM43601
SNVSA44B – AUGUST 2014 – REVISED JANUARY 2018
LM43601 3.5-V to 36-V, 1-A Synchronous Step-Down Voltage Converter
1 Features
1 33-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 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 LM43601 With
the WEBENCH® Power Designer
2 Applications
• Industrial Power Supplies
• Telecommunications Systems
• Sub-AM Band Automotive
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation
Simplified Schematic
VIN
CIN
VIN SW
LM43601
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
CBOOT
COUT
VOUT
CBIAS
CFF
RFBT
CVCC
RFBB
Copyright © 2018, Texas Instruments Incorporated
3 Description
The LM43601 regulator is an easy to use
synchronous step-down DC-DC converter capable of
driving up to 1 A of load current from an input voltage
ranging from 3.5 V to 36 V (42 V transient). The
LM43601 provides exceptional efficiency, output
accuracy, and dropout voltage in a very small solution
size. An extended family is available in 0.5-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 LM43601 device is available in the
16-leaded HTSSOP (PWP) package (6.6 mm × 5.1
mm × 1.2 mm) with 0.65-mm lead pitch. This device
is pin-to-pin compatible with LM46000, LM46001,
LM46002, LM43600, LM43602, and LM43603.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE
LM43601
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
space
Radiated Emission Graph
VIN = 12 V, VOUT = 3.3 V, FS= 500 kHz, IOUT = 1 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
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.

LM43601
LM43601
SNVSA44B – AUGUST 2014 – REVISED JANUARY 2018
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 ............................................ 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 Application .................................................. 25
9 Power Supply Recommendations...................... 43
10 Layout................................................................... 43
10.1 Layout Guidelines ................................................. 43
10.2 Layout Example .................................................... 46
11 Device and Documentation Support ................. 47
11.1 Device Support...................................................... 47
11.2 Receiving Notification of Documentation Updates 47
11.3 Community Resources.......................................... 47
11.4 Trademarks ........................................................... 47
11.5 Electrostatic Discharge Caution ............................ 47
11.6 Glossary ................................................................ 47
12 Mechanical, Packaging, and Orderable
Information ........................................................... 48
4 Revision History
Changes from Revision A (August 2014) to Revision B
Page
• Added top navigator icon for TI Design ................................................................................................................................. 1
• Editorial changes to meet writing/editing standards ............................................................................................................... 1
Changes from Original (August 2014) to Revision A
Page
• Changed from Preview to Production Data ........................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: LM43601
Copyright © 2014–2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design LM43601 SNVSA 44B – AUGUST 2014 – REVISED JANUARY 2018 LM43601 3.5-V to 36-V, 1-A Synchr onous Step-Down Voltage Converter 1 Fe atures •1 33-µA Quiescent Current in Regulation • High Efficiency at Ligh t Load (DCM and PFM) • Meets EN55022/ CISPR 22 EMI Standards • Integrated S ynchronous Rectification • Adjustable Frequency Range: 200 kHz to 2.2 MHz (5 00 kHz default) • Frequency Synchroni zation to External Clock • Internal C ompensation • Stable With Almost Any Combination of Ceramic, Polymer, Tantal um, and Aluminum Capacitors • Power-G ood Flag • Soft Start into Pre-Biased Load • Internal Soft Start: 4.1 ms Extendable Soft-Start Time by Extern al Capacitor • Output Voltage Trackin g Capability • Precision Enable to Pr ogram System UVLO • Output Short-Circ uit Protection With Hiccup Mode • Ove rtemperature Thermal Shutdown Protection • Create a Custom Design Using the LM43601 With the WEBENCH.
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