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LT3480EDD#TRPBF

Description
Conv DC-DC 3.6V to 36V Synchronous Step Down Single-Out 0.79V to 20V 2A Automotive 10-Pin DFN EP T/R
File Size353KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LT3480EDD#TRPBF Overview

Conv DC-DC 3.6V to 36V Synchronous Step Down Single-Out 0.79V to 20V 2A Automotive 10-Pin DFN EP T/R

LT3480EDD#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
TypeSynchronous Step Down
Output TypeAdjustable
Switching Frequency (kHz)200 to 2400
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)0.79 to 20
Maximum Output Current (A)2
Minimum Input Voltage (V)3.6
Maximum Input Voltage (V)36
Operating Supply Voltage (V)3.6 to 36
Typical Quiescent Current (uA)70
Line Regulation0.01%/V
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count10
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width3
PCB changed10
Lead ShapeNo Lead
LT3480
36V, 2A, 2.4MHz Step-Down
Switching Regulator with
70µA Quiescent Current
FEATURES
n
DESCRIPTION
The
LT
®
3480
is an adjustable frequency (200kHz to
2.4MHz) monolithic buck switching regulator that ac-
cepts input voltages up to 36V (60V maximum). A high
efficiency 0.25 switch is included on the die along with
a boost Schottky diode and the necessary oscillator, con-
trol, and logic circuitry. Current mode topology is used
for fast transient response and good loop stability. Low
ripple Burst Mode operation maintains high efficiency at
low output currents while keeping output ripple below
15mV in a typical application. In addition, the LT3480 can
further enhance low output current efficiency by draw-
ing bias current from the output when V
OUT
is above 3V.
Shutdown reduces input supply current to less than 1µA
while a resistor and capacitor on the RUN/SS pin provide a
controlled output voltage ramp (soft-start). A power good
flag signals when V
OUT
reaches 86% of the programmed
output voltage. The LT3480 is available in 10-lead MSOP
and 3mm
×
3mm DFN packages with exposed pads for
low thermal resistance.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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Wide Input Range:
Operation from 3.6V to 36V
Over-Voltage Lockout Protects Circuits
through 60V Transients
2A Maximum Output Current
Low Ripple Burst Mode
®
Operation
70µA I
Q
at 12V
IN
to 3.3V
OUT
Output Ripple < 15mV
Adjustable Switching Frequency: 200kHz to 2.4MHz
Low Shutdown Current: I
Q
< 1µA
Integrated Boost Diode
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 0.25 On-Resistance
0.790V Feedback Reference Voltage
Output Voltage: 0.79V to 20V
Soft-Start Capability
Small 10-Lead Thermally Enhanced MSOP and
(3mm
×
3mm) DFN Packages
APPLICATIONS
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Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
TYPICAL APPLICATION
3.3V Step-Down Converter
V
IN
4.5V TO 36V
TRANSIENT
TO 60V
OFF ON
14k
4.7µF
470pF
40.2k
V
IN
RUN/SS
BD
BOOST
0.47µF
V
C
RT
PG
SYNC
GND
FB
100k
316k
22µF
LT3480
SW
EFFICIENCY (%)
4.7µH
80
70
60
50
0
3480 TA01
Efficiency
V
OUT
3.3V
2A
100
90
V
OUT
= 5V
V
OUT
= 3.3V
V
IN
= 12V
L = 5.6µH
F = 800 kHz
0.5
1.0
1.5
LOAD CURRENT (A)
2
3480 TA01b
3480fe
For more information
www.linear.com/LT3480
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