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Overview
| Topology | Buck Converter |
| Input voltage | 9-36 V |
| Switching frequency | 300-2000 kHz |
| Output 1 | 3 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
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,30% (A) | RDC typ. (mΩ) | fres (MHz) | VOP (V) | Mount | Pins (Value) (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 74438356033 | SPEC | 10 files | Active i| Production is active. Expected lifetime: >10 years. | WE-MAPI SMT Power Inductor | 3.3 | 5.15 | 7.1 | 39.9 | 26 | 80 | SMT | 2 | – | 2 | – | – | 3.6 | – | ||
 | 60800213421 | SPEC | – | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | – | – | – | – | 2 | – | – | Jumper | – | 3 | Bag | |
 | 62000311121 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Pin Header | – | – | – | – | – | – | THT | 3 | Single | – | Pin Header | Straight | 2 | Bag | |
 | 62000621121 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Dual Pin Header | – | – | – | – | – | – | THT | 6 | Dual | – | Pin Header | Straight | 2 | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 74438356033 | SPEC | |
| 60800213421 | SPEC | – |
| 62000311121 | SPEC | – |
| 62000621121 | SPEC | – |
| Samples |
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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) | Mount | Pins (Value) (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples |
|---|