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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 36V
- Two Independent 1.6A/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
- PMOS Switch Driver for 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-Lead QFN Package
Typical applications
- Medical Lighting
- Automotive Lighting
- Industrial Lighting, Constant-Current, Constant-Voltage Source
- General Purpose
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) | IRIPPLE(mA) | Z(mΩ) | ILeak(µA) | DF(%) | Ø D(mm) | L(mm) | Packaging | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-MAPI SMT Power Inductor, 2.2 µH, 2.2 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Inductance2.2 µH | Performance Rated Current2.2 A | Saturation Current @ 30%3.55 A | DC Resistance147 mΩ | Self Resonant Frequency60 MHz | Operating Voltage80 V | MountSMT | – | – | – | – | – | – | – | – | Length2.5 mm | – | –Check availability | |||
 | SPECWE-MAPI SMT Power Inductor, 4.7 µH, 2.4 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Inductance4.7 µH | Performance Rated Current2.4 A | Saturation Current @ 30%5.15 A | DC Resistance137 mΩ | Self Resonant Frequency30 MHz | Operating Voltage80 V | MountSMT | – | – | – | – | – | – | – | – | Length3 mm | – | –Check availability | |||
 | SPECWCAP-ASLI Aluminum Electrolytic Capacitors, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ASLI Aluminum Electrolytic Capacitors | – | – | – | – | – | – | MountV-Chip SMT | Capacitance33 µF | Rated Voltage50 V (DC) | Endurance 2000 | Ripple Current190 mA | Impedance710 mΩ | Leakage Current16.5 µA | Dissipation Factor12 % | Diameter6.3 mm | Length7.7 mm | Packaging15" Tape & Reel | –Check availability |
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |