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LM3500 Datasheet(PDF) 1 Page - Texas Instruments

Part No. LM3500
Description  Synchronous Step-up DC/DC Converter for White LED Applications
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com

LM3500 Datasheet(HTML) 1 Page - Texas Instruments

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SNVS231F – MAY 2004 – REVISED APRIL 2007
LM3500 Synchronous Step-up DC/DC Converter for White LED Applications
Check for Samples: LM3500
input and output
Thermal Shutdown
Synchronous rectification, high efficiency and
no external schottky diode required
0.1µA shutdown current
Uses small surface mount components
Small 8-bump thin micro SMD package
Can drive 2-5 white LEDs in series
(may function with more low-VF LEDs)
LCD Bias Supplies
2.7V to 7V input range
White LED Backlighting
Internal output over-voltage protection (OVP)
circuitry, with no external zener diode required
Handheld Devices
LM3500-16: 15.5V OVP; LM3500-21: 20.5V
Digital Cameras
Portable Applications
True shutdown isolation
Input undervoltage lockout
Requires only small ceramic capacitors at the
The LM3500 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 intergrated synchronous switching (no external schottky diode
required) and a low feedback voltage (500mV), power efficiency of the LM3500 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 LM3500 operates with a fixed 1MHz switching frequency. When used with ceramic input and
output capacitors, the LM3500 provides a small, low-noise, low-cost solution.
Two LM3500 options are available with different output voltage capabilities. The LM3500-21 has a maximum
output voltage of 21V and is typically suited for driving 4 or 5 white LEDs in series. The LM3500-16 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 LM3500 uses internal protection circuitry on the output to prevent a destructive over-voltage event.
A single external resistor is used to set the maximum LED current in LED-drive applications. The LED current
can easily be adjusted using a pulse width modulated (PWM) signal on the shutdown pin. In shutdown, the
LM3500 completely disconnects the input from output, creating total isolation and preventing any leakage
currents from trickling into the LEDs.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.

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