LM46002-Q1 Datasheet, PDF (1/60 Pages) Texas Instruments – 3.5-V to 60-V, 2-A, Synchronous Step-Down Voltage Converter

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LM46002-Q1, LM46002A-Q1
SNVSAA2B – JULY 2015 – REVISED JULY 2017
LM46002-Q1 3.5-V to 60-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 1: –40°C to
+125°C Ambient Operating Temperature
• 27-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 and Adjustable External Soft Start
• 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 LM46002-Q1
With the WEBENCH^® Power Designer
3 Description
The LM46002-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 60 V. The LM46002-Q1
provides exceptional efficiency, output accuracy and
drop-out voltage in a very small solution size. An
extended family is available in various load-current
options and 36-V maximum input voltage. The device
is pin-to-pin compatible package with LM4360x and
LM4600x family. 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
reduction at light loads improve light load efficiency.
The family requires few external components. 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 LM46002A-Q1
version is optimized for PFM operation and
recommended for new designs. The LM46002-Q1
device is available in the 16-lead HTSSOP (PWP)
package (6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm
lead pitch.
2 Applications
• Sub-AM Band 12-V and 24-V Automotive
• Telecommunications Systems
• Commercial Vehicle Power Supplies
• General Purpose Wide V_IN Regulation
• High Efficiency Point-Of-Load Regulation
Simplified Schematic
VIN
CIN
VIN
SW
LM46002-Q1
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
CBOOT
VOUT
COUT
CBIAS
CFF
RFBT
CVCC
RFBB
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM46002-Q1
HTSSOP (16)
6.60 mm × 5.10 mm
LM46002A-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.
white
white
Radiated Emission Graph
V_IN = 24 V, V_OUT = 3.3 V, F_S = 500 kHz, I_OUT = 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.