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ADI LT3909EDD#PBF product image
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ADI LT3909EDD#PBFRoHS

Manufacturer
ADI
MPN
LT3909EDD#PBF
LCSC Part #
C671647
Packaging
DFN-12-EP(3x3)
Customer #
Key Attributes
2-String x 60mA, 2MHz Step-Up LED Driver with ±2% Current Matching
Datasheetpdf iconADI LT3909EDD#PBF
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QtyUnit PriceTotal Amount
1+$ 9.9133$ 9.91
10+$ 9.5716$ 95.72
Standard Packaging121/Full Tube
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Products Specifications

All
TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/LED Drivers
ManufacturerADI
PackagingDFN-12-EP(3x3)
Output Current60mA
Operating Temperature-40℃~+125℃
Frequency - Switching2MHz
DimmingPWM;Analog
Number of Channels2
TypeDC-DC
FeaturesOver Voltage Protection;Built-in soft-start;Short Circuit Protection;LED open-circuit protection;Over-Temperature Protection (OTP)
Switch tube (built-in/external)Built-in
TopologyBoost
Constant Current Accuracy2%
Voltage - Input(DC)2.9V~40V
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Introduction

AI Translation

A 2-string x 60mA LED driver with a fixed 2MHz step-up DC/DC converter capable of driving up to 36V of LEDs. Each LED string contains an accurate high-side current source with ±2% current matching. Output voltage adapts to variations in LED VF for optimum efficiency. Maximum LED current can be programmed from 10mA to 60mA per string using a single resistor. LED brightness can be reduced with analog dimming (up to 10:1) or with PWM dimming (up to 40,000:1 at 100Hz, up to 160:1 at 25kHz) (independent of leakage at VOUT). The LED pins can be paralleled for higher LED current. Additional features include: programmable maximum VOUT for open LED protection, a fault flag to indicate open-LED or LED-short-to-GND and an internal regulation loop to safely limit junction temperature. The LT3909 also includes internal compensation, internal soft-start and micropower shutdown. The LT3909 is available in the 12-pin (3mm x 3mm) DFN and 12-pin MSOP packages.

Features

AI Translation
  • Up to 36V of LEDs, 2-String x 60mA LED Driver
  • Wide Input Range: 2.91 to 40V
  • Up to 40,000:1 PWM Dimming (250ns LED On-Time)
  • ±2% LED Current Matching (Typ ±0.3%)
  • Integrated Schottky Diode
  • Internal 400mΩ, 40V, 1A Switch
  • Single Resistor Sets LED Current (10mA to 60mA) for Both High-Side Current Sources
  • Output Adapts to LED VF for Optimum Efficiency
  • LED Current Regulated Even for Vin > Vout
  • Fault Flag + Protection for Open-LED and LED-Short to-GND (Other String Remains in Regulation)
  • Programmable Maximum VOUT (Regulated)
  • Internal Compensation, Soft-Start and Thermal Regulation
  • Accurate EN/UVLO Threshold
  • Fixed 2MHz Switching Frequency

Applications

AI Translation
  • PDAs, Handheld Computers
  • GPS Receivers
  • Automotive Displays
  • High Contrast Instrument Clusters