LINEAR TECHNOLOGY LT3480 Data Sheet
Summary
This technical manual details the LT3480, a high-efficiency, adjustable frequency monolithic buck switching regulator. It is designed to maintain stable power for critical systems requiring wide input voltage support and exceptional efficiency across various loads. The document provides detailed specifications on advanced features such as Burst Mode operation, soft-start capability, Power Good flagging, and ultra-low shutdown current (<1µA). Ideal for engineers designing portable electronics, automotive battery regulation systems, and complex distributed industrial power supplies.
Page 1 Text Content
LT3480
36V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current
FEATURES DESCRIPTION n Wide Input Range:
The LT®3480 is an adjustable frequency (200k Hz to
Operation from 3.6V to 36V 2.4MHz) monolithic buck switching regulator that ac- Over-Voltage Lockout Protects Circuits cepts input voltages up to 36V (60V maximum). A high through 60V Transients effi ciency 0.25 switch is included on the die along with n 2A Maximum Output Current
a boost Schottky diode and the necessary oscillator, con-
n Low Ripple Burst Mode® Operation
trol, and logic circuitry. Current mode topology is used
70μA IQ at 12VIN to 3.3VOUT for fast transient response and good loop stability. Low Output Ripple < 15m V ripple Burst Mode operation maintains high effi ciency at n Adjustable Switching Frequency: 200k Hz to 2.4MHz
low output currents while keeping output ripple below
n Low Shutdown Current: IQ < 1μA
15m V in a typical application. In addition, the LT3480 can
n Integrated Boost Diode
further enhance low output current effi ciency by draw-
n Synchronizable Between 250k Hz to 2MHz
ing bias current from the output when VOUT is above 3V.
n Power Good Flag
Shutdown reduces input supply current to less than 1μA
n Saturating Switch Design: 0.25 On-Resistance
while a resistor and capacitor on the RUN/SS pin provide a
n 0.790V Feedback Reference Voltage
controlled output voltage ramp (soft-start). A power good
n Output Voltage: 0.79V to 20V
fl ag signals when VOUT reaches 86% of the programmed
FF IC IE
n Soft-Start Capability
output voltage. The LT3480 is available in 10-Pin MSOP
n Small 10-Pin Thermally Enhanced MSOP and
and 3mm × 3mm DFN packages with exposed pads for
(3mm × 3mm) DFN Packages low thermal resistance.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
APPLICATIONS
Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
n Automotive Battery Regulation
n Power for Portable Products
n Distributed Supply Regulation
n Industrial Supplies
TYPICAL APPLICATION
3.3V Step-Down Converter Effi ciency
VIN VOUT
4.5V TO 36V 3.3V TRANSIENT 2A VOUT = 5V
VIN BD
TO 60V
OFF ON RUN/SS BOOST
VOUT = 3.3V
VC LT3480 SW
40.2k SYNC FB VIN = 12V
GND L = 5.6μH
22μF100k F = 800 k Hz
0.5 1.0 1.5 LOAD CURRENT (A)
3480 TA01 3480 TA01b
3480fb
Page Summary Contents For LINEAR TECHNOLOGY LT3480 Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 304.86 KB |
| Published | May 25, 2026 |
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Frequently Asked Questions
What is the operating input voltage range for this regulator?
It accepts input voltages from 3.6V up to 36V (with a 60V absolute maximum).
How does it maintain efficiency during low output currents?
It features integrated boost diode and Burst Mode operation, allowing efficient draw-down of bias current while maintaining low output ripple.
Can I configure the startup voltage ramp?
Yes, it includes a soft-start capability controlled by an external resistor and capacitor on the RUN/SS pin to ramp the output voltage from 0.79V to 20V.
What are the package options for the LT3480?
It is available in 10-Pin MSOP, 16-Pin QSOP, and specific 3mm × 3mm DFN packages.