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reference designLT3942 | Demoboard DC2404A

Analog Devices LT3942 | Demoboard DC2404A

36V, 2A Synchronous Buck-Boost Converter and LED Driver

Overview

TopologyBuck Converter
Input voltage9-36 V
Switching frequency300-2000 kHz
Output 13 V / 2 A

Description

The LT3942 is a monolithic 4-switch synchronous buck-boost LED driver. The driver can regulate the LED string current up to 34V with input voltages above, below, or equal to the output voltage. The proprietary peak-buck peak-boost current mode control scheme allows adjustable and synchronizable 300kHz to 2MHz fixed frequency operation, or internal 25% triangle spread spectrum operation for low EMI. With 3V to 36V input, 0V to 36V output and seamless low-noise transitions between operation regions, the LT3942 is ideal for LED driver applications in automotive, industrial and battery-powered systems. The LT3942 provides LED current regulation with up to 128:1 internal and 5000:1 external PWM dimming using an optional high-side PMOS switch. The CTRL pin provides flexible 20:1 analog dimming with ±2.5% LED current regulation at 100mV full scale. Robust fault protection detects an open or short LED condition, during which the LT3942 retries, latches off, or keeps running.

Features

  • 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Proprietary Peak-Buck Peak-Boost Current Mode
  • 3V to 36V Input Voltage Range
  • 0V to 36V Output Voltage Range
  • ±1.5% Output Voltage Regulation
  • ±3% LED Current Regulation
  • 5000:1 External and 128:1 Internal PWM Dimming
  • Rail-to-Rail LED Current Sense and Monitor Output
  • Open and Short LED Protection with Fault Reporting
  • 300kHz to 2MHz Fixed Switching Frequency with External Frequency Synchronization
  • Flicker-Free Spread Spectrum for Low EMI
  • Available in 28-Lead QFN (4mm × 5mm)

Typical applications

  • Voltage Regulator with Accurate Current Limit
  • Automotive and Industrial Lighting / General Purpose LED Driver

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
fres(MHz)
VOP(V)
Pins
Type
Mount
L(mm)
H(mm)
IR(A)
Working Voltage(V (AC))
Operating Temperature
SamplesAvailability & Sample
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74438356033
SPECWE-MAPI SMT Power Inductor, 3.3 µH, 5.15 A

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
–
Downloads10 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-MAPI SMT Power Inductor
Inductance3.3 µH
Performance Rated Current5.15 A
Saturation Current @ 30%7.1 A
DC Resistance39.9 mΩ
Self Resonant Frequency26 MHz
Operating Voltage80 V
Pins2 
–
MountSMT 
Length4 mm
Height2 mm
Rated Current3.6 A
–
Operating Temperature -40 °C up to +125 °C
–Check availability
60800213421
SPECWR-PHD Jumper, –, –
Simu­lation–
Availability
–
Downloads3 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Jumper
–
–
–
–
–
–
Pins2 
–
–
–
–
Rated Current3 A
Working Voltage200 V (AC)
Operating Temperature -25 °C up to +105 °C
–Check availability
62000311121
SPECWR-PHD Pin Header, –, –
Simu­lation–
Availability
–
Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
–
–
–
–
–
–
Pins3 
TypeStraight 
MountTHT 
Length6 mm
–
Rated Current2 A
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C
–Check availability
62000621121
SPECWR-PHD Pin Header, –, –
Simu­lation–
Availability
–
Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
–
–
–
–
–
–
Pins6 
TypeStraight 
MountTHT 
Length6 mm
–
Rated Current2 A
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C
–Check availability