LM3429/-Q1 N-Channel Controller for Constant Current LED Drivers
1 Features
- LM3429-Q1 is AEC-Q100 Grade 1 Qualified for Automotive Applications
- VIN Range From 4.5 V to 75 V
- Adjustable Current Sense Voltage
- High-Side Current Sensing
- 2-Ω, 1-A Peak MosFET Gate Driver
- Input Undervoltage Protection
- Overvoltage Protection
- PWM Dimming
- Analog Dimming
- Cycle-by-Cycle Current Limit
- Programmable Switching Frequency
- Low Profile 14-lead HTSSOP Package
- Thermal Shutdown
2 Applications
- LED Drivers - Buck, Boost, Buck-Boost, SEPIC
- Indoor and Outdoor SSL
- Automotive
- General Illumination
- Constant-Current Regulators
3 Description
The LM3429 is a versatile high voltage N-channel MosFET controller for LED drivers. It can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75V, makes the LM3429 ideal for illuminating LEDs in a very diverse, large family of applications.
Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3429 uses Predictive Off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.
The LM3429 includes a high-voltage startup regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions. Additional features include analog dimming, PWM dimming, overvoltage protection, undervoltage lock-out, cycle-by-cycle current limit, and thermal shutdown.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LM3429 | HTSSOP (14) | 5.00 mm × 4.40 mm |
| LM3429-Q1 |
- For all available packages, see the orderable addendum at the end of the data sheet.
Typical Boost Application Circuit
4 Revision History
Changes from G Revision (April 2013) to H Revision
- Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
Changes from F Revision (May 2013) to G Revision
- Changed layout of National Data Sheet to TI formatGo
