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Analog Devices LT3964-1

Dual 36V Synchronous 2A Buck LED Driver with I2C

Overview

TopologyBuck Converter
Input voltage4-36 V
Switching frequency200-2000 kHz
Output 140 V / 2 A

Description

The LT3964-1 is a dual synchronous step-down DC/ DC converter with an I2C interface designed to operate as a constant-current and constant-voltage source and is ideal for driving LEDs. The fixed frequency and peak current mode topology result in stable operation over a wide range of supply and output voltages. The ground-referred voltage FB pin serves as the input for several Light Emitting Diode (LED) protection features, and allows the converter to operate as a constant-voltage source. The maximum output current is set by an external resistor, and the output current amplifier has a rail-to-rail common mode range. LT3964-1 uses an I2C interface to communicate with a microcontroller to read LED faults, write PWM and analog dimming registers and set fault masking. The I2C PWM input provides LED dimming ratios up to 8192:1. The I2C programmable CTRL register sets the gain of the external CTRL pin, and maximum current sense threshold, providing additional analog dimming capability.

Features

  • Wide Input Voltage Range: 4V to 36V
  • Two Independent 2A/40V Synchronous Bucks
  • I2C Interface for Internal True Color PWM™ Dimming (8192:1), Analog Dimming and Fault Reporting
  • 1000:1 External True Color PWM Dimming and 10:1 External Analog Dimming
  • P-Channel Metal-Oxide Semiconductor (PMOS) Switch Driver for Pulse-Width Modulators (PWM) and Output Disconnect
  • ±3% Constant Current Regulation
  • Adjustable Frequency: 200kHz to 2MHz
  • Frequency Synchronization with Clock Output
  • Programmable OPENLED Protection with Reporting
  • Short-Circuit Protection with Reporting
  • Programmable Undervoltage Lockout with Hysteresis
  • Internal Compensation
  • 9 Unique Device Addresses for I2C
  • Available in 5mm × 6mm 36-pin Quad-flat no-leads (QFN) Package

Typical applications

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
MountIR,40K
(A)
SizeVersion Samples
74437349100SPEC

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.

8 files Active i| Production is active. Expected lifetime: >10 years.WE-LHMI SMT Power Inductor 10 4.05 5.6 10.5 69 12 SMT 3.2 7050 SMT
7447709680SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-PD SMT Power Inductor 68 3.9 3.6 4.4 89 5.5 SMT 3.2 1210 Standard
Order Code Data­sheet Simu­lation
74437349100SPEC

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.

7447709680SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
MountIR,40K
(A)
SizeVersion Samples