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LM60440, LM60430
SNVSBN5A –FEBRUARY 2020–REVISED JUNE 2020
LM604x0 3.8-V to 36-V, 3-A, and 4-A Ultra-Small Synchronous Step-Down Converter
1 Features
3 Description
The LM604x0 regulator is an easy-to-use,
synchronous, step-down DC/DC converter that
delivers best-in-class efficiency for rugged industrial
applications. The LM60430 drives up to 3-A of load
current, and the LM60440 is industry's smallest 4A
step-down converter.
1
•
Functional Safety-Capable
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Documentation available to aid functional
safety system design
•
•
Low EMI and switching noise
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Meets CISPR22 class 5 standard
The LM604x0 is available in an ultra-miniature WQFN
package with wettable flanks and a standard QFN
pin-out with a thermal pad to enhance thermal
performance. This enhanced QFN package features
extremely small parasitic inductance and resistance,
enabling very high efficiency while minimizing switch
node ringing and dramatically reducing EMI.
Enhanced QFN package minimizes parasitic
inductance and switch node ringing
Configured for rugged industrial applications
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Standard QFN footprint: single large thermal
pad and all pins accessible from perimeter
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Pin compatible variants:
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LM60440 (36 V, 4 A)
LM60430 (36 V, 3 A)
The LM604x0 uses peak-current-mode control to
automatically fold back frequency at light load to
ensure exceptional efficiency across the entire load
range. The low power dissipation paired with a
thermally optimized QFN package enables a power
dense solution size. In addition the device requires
few external components and has a pinout designed
for simple PCB layout. The small solution size and
feature set of the LM604x0 are designed to simplify
implementation for a wide range of end equipment.
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Junction temperature range –40°C to +150°C
Frequency: 400 kHz, 1 MHz
Output voltage range: 1 V to 24 V
•
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High efficiency power conversion at all loads
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Peak efficiency > 95%
90% PFM efficiency at 10-mA, 12 VIN, 5 VOUT
Low operating quiescent current of 25 µA
This device is also available in an AEC-Q100-
qualified version.
Create a custom design using the LM60440 with
the WEBENCH® Power Designer
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
2 Applications
LM60440
WQFN-13
3.00 mm × 2.00 mm
•
•
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Industrial PC and CPU (PLC controller)
Servo drive and AC drive control module
Medical and instrumentation applications
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
space
Efficiency versus Output Current
VOUT = 5 V, 400 kHz
Simplified Schematic
BOOT
100
90
VIN
CIN
VIN
EN
CBOOT
L1
VOUT
COUT
SW
PGND
VCC
80
PG
FB
70
RFBT
CVCC
60
8V
12V
RFBB
AGND
24V
50
0
0.5
1
1.5
2
2.5
Output Current (A)
3
3.5
4
4.5
Eff_
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.