Details, datasheet, quote on part number: LT3932EUFDPBF
PartLT3932EUFDPBF
Category
TitleIC LED DRIVER SYNC 40V 2A 28 QFN
Description
CompanyLinear Technology Corporation
DatasheetDownload LT3932EUFDPBF datasheet
  
LT3932EUFDPBF photo

Others parts numbering
LT3932IUFDPBF
LT3932HUFDPBF

 

Features, Applications

1.5% LED Current Regulation nn 1.2% Output Voltage Regulation nn 5000:1 PWM Dimming nn 128:1 Internal PWM Dimming nn Spread-Spectrum Frequency Modulation nn Silent Switcher Architecture for Low EMI to 36V Input Voltage Range to 36V LED String Voltage 2A, 36V Internal Switches to 2MHz with SYNC Function nn 99.9% Maximum Duty Cycle nn Analog or Duty Cycle LED Current Control nn Open/Short LED Protection and Fault Indication nn Accurate LED Current Sense with Monitor Output nn Programmable UVLO nn Thermally Enhanced 5mm) QFN

DESCRIPTION

The is a monolithic, synchronous, step-down DC/DC converter that utilizes fixed-frequency, peak current control and provides PWM dimming for a string of LEDs. The LED current is programmed by an analog voltage or the duty cycle of pulses at the CTRL pin. An output voltage limit can be set with a resistor divider to the FB pin. The switching frequency is programmable from by an external resistor at the RT pin by an external clock at the SYNC/SPRD pin. With the optional spread spectrum frequency modulation enabled, the frequency varies from 125% to reduce EMI. The LT3932 also includes a driver for an external, high side PMOS for PWM dimming and an internal PWM signal generator for analog control of PWM dimming when an external signal is not available. Additional features include an LED current monitor, an accurate EN/UVLO pin threshold, open-drain fault reporting for open-circuit and short-circuit load conditions, and thermal shutdown.

L, LT, LTC, LTM, Linear Technology, the Linear logo and Silent Switcher are registered trademarks and True Color PWM is a trademark of Analog Devices, Inc. Protected by U.S. Patents including and other patents pending. All other trademarks are the property of their respective owners.

APPLICATIONS
Automotive Lighting Industrial and General Purpose Lighting

VIN 30.1k LT3932 VREF 2.2F 100k CTRL PWM GND ISP 50m INTVCC 2.2F 100k FAULT SYNC/SPRD 2MHz 100nF ISN PWMTG ISMON 162k 10nF

TOP VIEW EN/UVLO INTVCC CTRL GND 22 GND 21 VIN 20 VIN 29 GND SW 17 VIN 16 VIN 15 GND SYNC/SPRD PWM PWMTG VOUT RP RT BST VIN

VIN, EN/UVLO.............................................................40V ISP, ISN, and VOUT.....................................................40V ISP ISN..................................................................0.3V CTRL and FB.............................................................3.3V PWM, SYNC/SPRD, and FAULT....................................6V SS and VC.................................................................3.3V SW, BST, INTVCC, VREF, ISMON, PWMTG, RT, and RP................................................................ (Note 2) Operating Junction Temperature Range (Notes to 150C Storage Temperature Range................... to 150C

UFD PACKAGE 5mm) PLASTIC QFN = 43C/W EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

PART MARKING* 3932 PACKAGE DESCRIPTION 5mm) Plastic QFN 5mm) Plastic QFN 5mm) Plastic QFN TEMPERATURE RANGE to 150C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25C. VIN = 12V, VEN/UVLO = 5V unless otherwise noted.

PARAMETER Input Voltage Range VIN Pin Quiescent Current EN/UVLO Threshold (Falling) EN/UVLO Rising Hysteresis EN/UVLO Pin Hysteresis Current Reference VREF Voltage VREF Pin Current Limit IVREF = 0A IVREF = 500A VREF = 1.9V, Current Out of Pin

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25C. VIN = 12V, VEN/UVLO = 5V unless otherwise noted.

PARAMETER LED Current Regulation CTRL-Off Threshold (Falling) CTRL-Off Rising Hysteresis CTRL Pin Current Sense Voltage (VISP-VISN) (Analog Input) ISP Pin Current ISN Pin Current ISP/ISN Common Mode Range Current Error Amplifier Transconductance Duty Cycle Control of LED Current Sense Voltage (VISP-VISN) (Duty Cycle Input) CTRL Pulse Input High (VIH) CTRL Pulse Input Low (VIL) CTRL Pulse Input Frequency Range Voltage Regulation FB Regulation Voltage FB Pin Current Voltage Error Amplifier Transconductance Power Stage Peak Current Limit Minimum Off-Time Minimum On-Time Bottom Switch On-Resistance Top Switch On-Resistance Oscillator Programmed Switching Frequency (fSW) Spread Spectrum Frequency Range RT Pin Current Limit SYNC/SPRD Threshold (Rising) SYNC/SPRD Falling Hysteresis SYNC/SPRD Pin Current Soft-Start SS Pin Charging Current SS Pin Discharging Current SS Lower Threshold (Falling) SS Higher Threshold (Rising) VSS = 0V VSS mV V VSYNC/SPRD = 45.3k, VSYNC/SPRD = 523k, VSYNC/SPRD = 45.3k, VSYNC/SPRD = 523k, VSYNC/SPRD = 3.3V VRT = 0V, Current Out of Pin

VCTRL = 2V VCTRL 2V (100%), VIN = 36V, VISP = 24V VCTRL 750mV (50%), VIN = 36V, VISP = 24V VCTRL 300mV (5%), VIN = 36V, VISP = 24V VIN = 36V, VISP = 24V, VCTRL = 2V, Current Into Pin VIN = 36V, VISN = 24V, VCTRL = 2V, Current Into Pin VIN = 36V (Note 5) VIN = 36V, VISP = 24V CTRL Duty 75% (100%), VIN = 36V, VISP = 24V CTRL Duty 37.5% (50%), VIN = 36V, VISP = 24V CTRL Duty 15% (5%), VIN = 36V, VISP = 24V


 

Some Part number from the same manufacture Linear Technology Corporation
LT3932IUFDPBF
LT3932HUFDPBF
 
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