LM43601-Q1_16 Datasheet, PDF (1/53 Pages) Texas Instruments – LM43601-Q1 SIMPLE SWITCHER® 3.5 V to 36 V 1 A Synchronous Step-Down Voltage Converter

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LM43601-Q1
SNVSAA0A – JULY 2015 – REVISED AUGUST 2015
LM43601-Q1 SIMPLE SWITCHER^® 3.5 V to 36 V 1 A Synchronous Step-Down Voltage
Converter
1 Features
•1 AEC-Q100 Qualified (–40°C to +125°C Operating
Junction Temperature)
• 33 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 Automotive
• Industrial Power Supplies
• Telecommunications Systems
• General Purpose Wide V_IN Regulation
• High Efficiency Point-Of-Load Regulation
3 Description
The LM43601-Q1 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 36 V (42
V transient). The LM43601-Q1 provides exceptional
efficiency, output accuracy and drop-out voltage in a
very small solution size. An extended family is
available in 0.5 A, 2 A and 3 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 LM43601-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. Pin to pin compatible with LM46000,
LM46001, LM46002, LM43600, LM43602, LM43603.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM43601-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
LM43601-Q1
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
Radiated Emission Graph
V_IN = 12 V, V_OUT = 3.3 V, F_S= 500 kHz, I_OUT = 1 A
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.