LM46002-Q1_15 Datasheet, PDF (1/52 Pages) Texas Instruments – SIMPLE SWITCHER 3.5 V to 60 V 2 A Synchronous Step-Down Voltage Converter

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LM46002-Q1
SNVSAA2A – JULY 2015 – REVISED AUGUST 2015
LM46002-Q1 SIMPLE SWITCHER^® 3.5 V to 60 V 2 A Synchronous Step-Down Voltage
Converter
1 Features
•1 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)
• 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
• Over Temperature Thermal Shutdown Protection
2 Applications
• Sub-AM Band 12 V and 24 V Automotive
• Industrial Power Supplies
• Telecommunications Systems
• Commercial Vehicle Power Supplies
• General Purpose Wide V_IN Regulation
• High Efficiency Point-Of-Load Regulation
3 Description
The LM46002-Q1 SIMPLE SWITCHER^® 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 in pin-to-pin compatible packages, including
LM46001, LM46000, LM43603, LM43602, LM43601
and LM43600. 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
under-voltage lockout, cycle-by-cycle current limit,
and output short circuit protection. The LM46002-Q1
device is available in the HTSSOP / PWP 16 leaded
package (5.1 mm x 6.6 mm x 1.2 mm) with 0.65 mm
lead pitch.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM46002-Q1
HTSSOP (16)
5.1 mm x 6.6 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
V_IN
C_IN
VIN
SW
LM46002-Q1
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
C_BOOT
V_OUT
C_OUT
C_BIAS
C_FF
R_FBT
C_VCC
R_FBB
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.