LM43603-Q1_15 Datasheet, PDF (1/50 Pages) Texas Instruments – LM43603-Q1 SIMPLE SWITCHER® 3.5 V to 36 V 3 A Synchronous Step-Down Voltage Converter

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LM43603-Q1
SNVSA82A – APRIL 2015 – REVISED MAY 2015
LM43603-Q1 SIMPLE SWITCHER® 3.5 V to 36 V 3 A Synchronous Step-Down Voltage
Converter
1 Features
•1 LM43603-Q1 is an Automotive-Grade Product that
is AEC-Q100 Qualified (–40°C to +125°C
Operating Junction 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 a Program System UVLO
• Output Short Circuit Protection with Hiccup Mode
• Overtemperature Thermal Shutdown Protection
2 Applications
• Sub-AM Band Automotive
• Industrial Power Supplies
• Telecommunications Systems
• General Purpose Wide V_IN Regulation
• High Efficiency Point-Of-Load Regulation
3 Description
The LM43603-Q1 SIMPLE SWITCHER^® regulator is
an easy-to-use synchronous step-down DC-DC
converter capable of driving up to 3 A of load current
from an input voltage ranging from 3.5 V to 36 V (42
V abs max). The LM43603-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 2 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, V_CC
undervoltage lockout, cycle-by-cycle current limit, and
output short circuit protection. The LM43603-Q1
device is available in the HTSSOP / PWP 16-pin
leaded package (5.1 mm x 6.6 mm x 1.2 mm); the
device is pin-to-pin compatible with LM43600,
LM43601, LM43602, LM46000, LM46001, and
LM46002.
PART NUMBER
LM43603-Q1
Device Information
PACKAGE
BODY SIZE
HTSSOP (16)
5.1 mm x 6.6 mm
4 Simplified Schematic
VIN
CIN
VIN
SW
LM43603Q
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
CBOOT
VOUT
COUT
CBIAS
CFF
RFBT
CVCC
RFBB
C001
1
Radiated Emission Graph
12 V_IN to 3.3 V_OUT, F_S = 500 kHz, I_OUT = 3 A
80
Evaluation Board
70
EN 55022 Class B Limit
EN 55022 Class A Limit
60
50
40
30
20
10
0
0
200
400
600
800
1000
Frequency (MHz)
C001
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.