LM46000 Datasheet, PDF (1/56 Pages) Texas Instruments – LM46000 SIMPLE SWITCHER® 3.5 V to 60 V 0.5 A Synchronous Step-Down Voltage Converter

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LM46000
SNVSA45A – JUNE 2014 – REVISED JULY 2014
LM46000 SIMPLE SWITCHER^® 3.5 V to 60 V 0.5 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 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
• 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 LM46000 SIMPLE SWITCHER® regulator is an
easy to use synchronous step-down DC-DC
converter capable of driving up to 500 mA of load
current from an input voltage range of 3.5 V to 60 V.
The LM46000 provides exceptional efficiency, output
accuracy and drop-out voltage in a very small
solution size. An extended family is available in 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 under-voltage lockout, cycle-
by-cycle current limit, and output short circuit
protection. The LM46000 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 LM46001, LM46002, LM43603,
LM43602, LM43601, and LM43600.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM46000
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 = 0.5 A
V_IN
C_IN
VIN
SW
LM46000
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.