LM46001 Datasheet, PDF (1/52 Pages) Texas Instruments – LM46001 SIMPLE SWITCHER® 3.5 V to 60 V 1 A Synchronous Step-Down Voltage Converter

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LM46001
SNVSA46A – JUNE 2014 – REVISED JULY 2014
LM46001 SIMPLE SWITCHER^® 3.5 V to 60 V 1 A Synchronous Step-Down Voltage
Converter
1 Features
•1 24 µA Quiescent Current in Regulation
• High Efficiency at Light Load (DCM and PFM)
• Meets EN55022/CISPR 22 EMI standards
• Integrated Synchronous Rectification
• Adjustable Switching Frequency: 200 kHz to 2.2
MHz (500 kHz default)
• Frequency Synchronization to External Clock
• Internal Compensation
• Stable with Many Combinations 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
• Industrial Power Supplies
• Telecommunications Systems
• Sub-AM Band 12 V and 24 V Automotive
• Commercial Vehicle Power Supplies
• General Purpose Wide V_IN Regulation
• High Efficiency Point-Of-Load Regulation
Simplified Schematic
3 Description
The LM46001 SIMPLE SWITCHER® 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 60 V. The
LM46001 provides exceptional efficiency, output
accuracy and drop-out voltage in a very small
solution size. An extended family is available in 0.5 A
and 2.0 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
reduction 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
under-voltage lockout, cycle-by-cycle current limit,
and output short circuit protection. The LM46001
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. Pin to pin compatible with LM46000,
LM46002, LM43603, LM43602, LM43601, and
LM43600.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM46001
HTSSOP (16)
5.1 mm x 6.6 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Radiated Emission Graph
V_OUT = 3.3 V, V_IN = 24 V, F_S= 500 kHz, I_OUT = 1 A
V_IN
C_IN
VIN
SW
LM46001
ENABLE
PGOOD
SS/TRK
RT
SYNC
AGND
CBOOT
BIAS
FB
VCC
PGND
L
C_BOOT
C_OUT
V_OUT
C_BIAS
C_FF
R_FBT
C_VCC
R_FBB
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.