The LM3421-Q1 and LM3423-Q1 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the these controllers ideal for illuminating LEDs in a large family of applications.
Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421-Q1 and LM3423-Q1 devices use 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 LM3421-Q1 and LM3423-Q1 devices include a high-voltage start-up 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.
| Number of channels | 1 |
| Topology | Boost Controller, Buck-Boost Controller, SEPIC Controller |
| Rating | Automotive |
| Operating temperature range (°C) | -40 to 150 |
| Vin (min) (V) | 4.5 |
| Vin (max) (V) | 75 |
| Vout (min) (V) | 3 |
| Vout (max) (V) | 72 |
| Iout (max) (A) | 5 |
| Iq (typ) (mA) | 2 |
| Switching frequency (max) (kHz) | 2000 |
| Features | Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown |
| HTSSOP (PWP) | 16 | 32 mm² 5 x 6.4 |
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