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Overview
| Topology | Buck-Boost Converter |
| Input voltage | 5-36 V |
| Switching frequency | 200-2000 kHz |
| Output 1 | 30 V / 1 A |
| Output 2 | 30 V / 1 A |
| IC revision | 1 |
Description
Released on LT JournalThe LTR3964 is a dual synchronous step-down DC/DC converter with 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 LED protection features, and also 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 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, andmaximum current sense threshold, providing additional analog dimming capability.
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 and10:1 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
- Constant-Current, Constant-Voltage Source
- General Purpose, Industrial, Medical and Automotive Lighting
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 | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR 2 (mA) | RDC max. (mΩ) | Type | IR (A) | Z @ 1 GHz (Ω) | H (mm) | 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 | – | – | – | – | 176 | – | 1.3 | – | 1 | ||
 | 742792040 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | SMT | 600 | 700 | 150 MHz | 2000 | 150 | High Current | 1.5 | 193 | 0.0009 | ||
 | 74279220181 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-MPSB EMI Multilayer Power Suppression Bead | – | – | – | 26.5 | – | – | SMT | 180 | 202 | 155 MHz | 3100 | 37 | High Current | 3.1 | 61 | 0.9 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 74438323022 | SPEC | |
| 742792040 | SPEC | |
| 74279220181 | 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 | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR 2 (mA) | RDC max. (mΩ) | Type | IR (A) | Z @ 1 GHz (Ω) | H (mm) | Samples |
|---|