LINEAR TECHNOLOGY 700mA Low Noise High Current LED Charge Pump Specification Guide User Manual
Summary
This sophisticated charge pump DC/DC converter, LTC3215, is designed as a high-efficiency, low-noise driver for powering high-current LEDs. It offers automatic mode switching and ultralow dropout functionality, enabling reliable light output up to 700mA from variable inputs (2.9V–4.4V). The accompanying manual provides comprehensive electrical characteristics, operational parameters, and application guidance, making it ideal for engineers developing small, battery-powered electronics such as smartphone camera flashes, PDAs, general lighting systems, or portable strobe applications.
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LTC3215
700m A Low Noise High Current LED Charge Pump
FEATURES DESCRIPTIO High Efficiency Operation: 1x, 1.5x or 2x Boost The LTC®3215 is a low noise, high current charge pump Modes with Automatic Mode Switching DC/DC converter designed to power high current LEDs. Ultralow Dropout ILED Current Control The part includes an accurate programmable current Output Current up to 700m A source capable of driving loads up to 700m A from a 2.9V
Low Noise Constant Frequency Operation* to 4.4V input. Low external parts count (two flying capaci- Wide VIN Range: 2.9V to 4.4V tors, one programming resistor and two bypass capaci- Open/Shorted LED Protection tors) makes the LTC3215 ideally suited for small, battery- LED Disconnect in Shutdown powered applications.
Low Shutdown Current: 2.5µA
Built-in soft-start circuitry prevents excessive inrush cur-
4% LED Current Programming Accuracy
rent during start-up. High switching frequency enables the
Automatic Soft-Start Limits Inrush Current
use of small external capacitors. LED current is pro-
No Inductors
grammed with an external resistor. The LED is discon-
Tiny Application Circuit (All Components <1mm
nected from VIN during shutdown.
Profile)
EF FI CI EN CY (P LE D/ N)
3mm × 3mm 10-Lead DFN Package An ultralow dropout current source maintains accurate LED current at very low ILED voltages. Automatic mode switching optimizes efficiency by monitoring the voltage
APPLICATIO S
across the LED current source and switching modes only
LED Torch/Camera Light Supply for Cell Phones, when ILED dropout is detected. The LTC3215 is available in PDAs and Digital Cameras a low profile 3mm × 3mm 10-Lead DFN package. General Lighting and/or Flash/Strobe Applications , LTC and LT are registered trademarks of Linear Technology Corporation.
*Protected by U.S. Patent 6411531.
TYPICAL APPLICATIO
Efficiency vs VIN
ILED = 200m A
C1+ C1– C2+ C2– VIN2.9V TO 4.4V CPO
CIN LED1 CCPO
2.2µF LTC3215 4.7µF
ILED ILED
ENDISABLE ENABLE
LED = AOT2015 HPW 1751B 20k VF = 3V TYP AT 200m A
3215 TA01a
VIN (V)
LED1: AOT2015 HPW 1751B
3215 TA01b
Page Summary Contents For LINEAR TECHNOLOGY 700mA Low Noise High Current LED Charge Pump Specification Guide User Manual
Manual Details
| Brand | Current |
|---|---|
| Pages | 12 |
| File Size | 159.83 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
What is the maximum output current for LED driving?
The output current can be up to 700mA, capable of driving loads from a 2.9V minimum input.
Can this device operate with low power or sleep modes?
Yes, it features an ultralow shutdown current of 2.5µA and automatic LED disconnect in shutdown mode.
How is the efficiency optimized during operation?
The Automatic Mode Switching optimizes efficiency by monitoring the voltage across the LED current source and switching modes only when a dropout is detected.
What types of applications are ideal for this charge pump?
It is suited for small, battery-powered applications such as LED Torch/Camera Light Supply or General Lighting/Flash/Strobe Applications.