LINEAR TECHNOLOGY LT3465 LT3465A User Guide Manual
Summary
These high-efficiency LT3465/LT3465A drivers are specialized DC/DC converters designed to power multiple white LEDs safely from low voltages. Featuring a built-in Schottky diode and adjustable switching frequencies (1.2MHz or 2.4MHz), they optimize performance and simplify design by eliminating the need for external components like ballast resistors. This manual provides comprehensive electrical specifications, operational parameters, and application data needed by electronics engineers designing advanced, reliable lighting solutions for consumer products like mobile phones and digital cameras.
Page 1 Text Content
LT3465/LT3465A 1.2MHz/2.4MHz White LED Drivers with Built-in Schottky in Thin SOT
FEATURES DESCRIPTIO
Inherently Matched LED Current The LT®3465/LT3465A are step-up DC/DC converters Drives Up to Six LEDs from a 3.6V Supply designed to drive up to six LEDs in series from a Li-Ion cell. No External Schottky Diode Required Series connection of the LEDs provides identical LED 1.2MHz Switching Frequency (LT3465) currents and eliminates the need for ballast resistors. 2.4MHz Switching Frequency Above AM Broadcast These devices integrate the Schottky diode required exter- Band (LT3465A) nally on competing devices. Additional features include VIN Range: 2.7V to 16V output voltage limiting when LEDs are disconnected, one- VOUT(MAX) = 30V pin shutdown and dimming control. The LT3465 has Automatic Soft-Start (LT3465) internal soft-start. Open LED Protection
The LT3465 switches at 1.2MHz, allowing the use of tiny
High Efficiency: 81% (LT3465) 79% (LT3465A)
external components. The faster LT3465A switches at
Typical EF FI CI EN CY
2.4MHz. Constant frequency switching results in low input
Requires Only 0.22µF Output Capacitor
noise and a small output capacitor. Just 0.22µF is required
Low Profile (1mm) SOT-23
for 3-, 4- or 5-LED applications. APPLICATIO The LT3465 and LT3465A are available in the low profile (1mm) 6-lead SOT-23 (Thin SOTTM) package.
Cellular Phones
, LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a PDAs, Handheld Computers trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Digital Cameras MP3 Players GPS Receivers
TYPICAL APPLICATIO
Conversion Efficiency
L1 22µH VIN = 3.6V
3V TO 5V 4 LEDs
SW VOUT VIN
C1 LT3465/ C2 1µF LT3465A 0.22µF
SHUTDOWN
AND DIMMING CTRL FB
CONTROL GND
C1, C2: X5R OR X7R DIELECTRIC
LT3465
L1: MURATA LQH32CN220
LT3465A
Figure 1. Li-Ion Powered Driver for Four White LEDs
LED CURRENT (m A)
3465afa
Page Summary Contents For LINEAR TECHNOLOGY LT3465 LT3465A User Guide Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 330.32 KB |
| Published | May 29, 2026 |
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Frequently Asked Questions
What is the maximum number of LEDs this device can drive in series?
The LT3465/LT3465A are designed to drive up to six LEDs in series.
Does this converter require an external Schottky diode?
No, it eliminates the need for a ballast resistor and doesn't require an external Schottky diode.
What is the recommended operating temperature range?
The LT3465E/LT3465AE are guaranteed to meet performance in -40°C to 85°C.
How can low input noise be maintained?
Constant frequency switching results in low input current noise and requires only a small output capacitor (0.22µF).
What is the expected efficiency during normal operation?
Typical conversion efficiencies are listed as 81% for LT3465 and 79% for LT3465A.