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Product details

Parameters

Channels (#) 1 Vin (Min) (V) 2.7 Vin (Max) (V) 7 Switching frequency (Max) (kHz) 1000 Product type Inductive LED current per channel (mA) 100 Shutdown current (Typ) (uA) 0.1 Topology Boost Peak efficiency (%) 85 Features OVP Operating temperature range (C) -40 to 85 open-in-new Find other Backlight LED drivers

Package | Pins | Size

DSBGA (YZR) 8 3 mm² 1.981 x 1.981 open-in-new Find other Backlight LED drivers

Features

  • Synchronous Rectification, High Efficiency and no External Schottky Diode required
  • Uses Small Surface Mount Components
  • Can Drive 2-5 White LEDs in Series (May Function with More Low VF LEDs)
  • 2.7V to 7V Input Range
  • True Shutdown Isolation, no LED Leakage Current
  • DC Voltage LED Current Control
  • Input Undervoltage Lockout
  • Internal Output Over-Voltage Protection (OVP) Circuitry, with no External Zener Diode Required LM3501-16: 15.5V OVP; LM3501-21: 20.5V OVP.
  • Requires Only a Small 16V (LM3501-16) or 25V (LM3501-21) Ceramic Capacitor at the Input and Output
  • Thermal Shutdown
  • 0.1µA shutdown Current
  • Small 8-Bump Thin DSBGA Package

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Description

The LM3501 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. With fully integrated synchronous switching (no external schottky diode required) and a low feedback voltage (515 mV), power efficiency of the LM3501 circuit has been optimized for lighting applications in wireless phones and other portable products (single cell Li-Ion or 3-cell NiMH battery supplies). The LM3501 operates with a fixed 1 MHz switching frequency. When used with ceramic input and output capacitors, the LM3501 provides a small, low-noise, low-cost solution.

Two LM3501 options are available with different output voltage capabilities. The LM3501-21 has a maximum output voltage of 21V and is typically suited for driving 4 or 5 white LEDs in series. The LM3501-16 has a maximum output voltage of 16V and is typically suited for driving 3 or 4 white LEDs in series (maximum number of series LEDs dependent on LED forward voltage). If the primary white LED network should be disconnected, the LM3501 uses internal protection circuitry on the output to prevent a destructive overvoltage event.

A single external resistor is used to set the maximum LED current in LED-drive applications. The LED current can easily be adjusted by varying the analog control voltage on the control pin or by using a pulse width modulated (PWM) signal on the shutdown pin. In shutdown, the LM3501 completely disconnects the input from output, creating total isolation and preventing any leakage currents from trickling into the LEDs.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet LM3501 Synchronous Step-up DC/DC Converter for White LED Applications datasheet (Rev. C) May 02, 2013
White papers Common LED Functions and LED Driver Design Considerations Sep. 21, 2020
Technical articles Overcoming challenges for backlight LED drivers in automotive display solutions Jul. 16, 2020
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
User guides AN-1318 LM3501 Evaluation Board (Rev. A) Apr. 30, 2013

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
79
Description

A high efficiency synchronous step-up DC/DC converter with analog brightness control designed for white LED applications.

Features
  • Synchronous rectification, high efficiency and no external schottky diode required
  • Uses small surface mount components
  • Can drive up to 3 (or 4 low VF) white LEDs in series
  • 2.7V to 7V input range
  • True shutdown isolation, no LED leakage current
  • DC voltage LED current control
  • Input undervoltage lockout
  • Output (...)

Design tools & simulation

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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 8 View options

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