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Overview
| Topology | Buck Converter |
| Input voltage | 9-36 V |
| Output 1 | 7.7 V / 1 A |
Description
The EVAL-LT3964-1-AZ evaluation circuit is a 36V synchronous dual Light-emitting diode (LED) driver with I2C featuring the LT3964-1. It drives two channels of LEDs at 1A when VIN is between 9V and 36V. EVAL-LT3964-1-AZ runs at 2MHz switching frequency. Its two channels can drive separate LED strings, which can have different currents, voltages, or dimming ratios. It can be controlled with I2C communications, or it can be run in non-I2C mode with proper ADDR pin settings. It is protected against both open and short LED conditions and reports the faults. In I2C mode, faults can be enabled or disabled. Up to 8 different EVAL-LT3964-1-AZ can be placed on the same I2C bus with unique addresses. A serial interface is available when connected to a DC2026C Linduino® One demo circuit.The LT3964-1 has an input voltage range from 4V to 36V. It has two independent 1.8A, 40V bucks with internal, synchronous 40V switches for high efficiency and small size. It has an adjustable switching frequency between 200kHz and 2MHz. It can be synchronized to an external source or programmed with a clock output (CLKOUT). The PWMTG high-side PWM MOSFET drivers assist with short-circuit protection and versatility. Although the evaluation circuit is optimized for just two LEDs per channel, it can be altered to be buck regulators with as high as 33V of LEDs if VIN is high enough and circuit components are changed appropriately.
Features
Wide Input Voltage Range: 4V to 36VTwo Independent 2A/40V Synchronous BucksI2C Interface for Internal True Color PWM™ Dimming (8192:1), Analog Dimming and Fault Reporting1000:1 External True Color PWM Dimming and 10:1 External Analog DimmingP-Channel Metal-Oxide Semiconductor (PMOS) Switch Driver for Pulse-Width Modulators (PWM) and Output Disconnect±3% Constant Current RegulationAdjustable Frequency: 200kHz to 2MHzFrequency Synchronization with Clock OutputProgrammable OPENLED Protection with ReportingShort-Circuit Protection with ReportingProgrammable Undervoltage Lockout with HysteresisInternal Compensation9 Unique Device Addresses for I2CAvailable in 5mm × 6mm 36-pin Quad-flat no-leads (QFN) Package
Typical applications
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,30% (A) | RDC typ. (mΩ) | fres (MHz) | VOP (V) | Mount | C | VR (V (DC)) | Endurance (h) | Operating Temperature | IRIPPLE (mA) | Z (mΩ) | ILeak (µA) | DF (%) | Ø D (mm) | L (mm) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 74438323022 | SPEC | 10 files | Active i| Production is active. Expected lifetime: >10 years. | WE-MAPI SMT Power Inductor | 2.2 | 2.2 | 3.55 | 147 | 60 | 80 | SMT | – | – | – | – | – | – | – | – | – | 2.5 | – | ||
 | 74438336047 | SPEC | 10 files | Active i| Production is active. Expected lifetime: >10 years. | WE-MAPI SMT Power Inductor | 4.7 | 2.4 | 5.15 | 137 | 30 | 80 | SMT | – | – | – | – | – | – | – | – | – | 3 | – | ||
 | 865080645010 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-ASLI Aluminum Electrolytic Capacitors | – | – | – | – | – | – | V-Chip SMT | 33 µF | 50 | 2000 | -55 °C up to +105 °C | 190 | 710 | 16.5 | 12 | 6.3 | 7.7 | 15" Tape & Reel |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 74438323022 | SPEC | |
| 74438336047 | SPEC | |
| 865080645010 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,30% (A) | RDC typ. (mΩ) | fres (MHz) | VOP (V) | Mount | C | VR (V (DC)) | Endurance (h) | Operating Temperature | IRIPPLE (mA) | Z (mΩ) | ILeak (µA) | DF (%) | Ø D (mm) | L (mm) | Packaging | Samples |
|---|
