LM3423 Datasheet | Texas Instruments

Features - 1 VIN Range From 4.5 V to 75 V - High-Side Adjustable Current Sense - 2-Ω, 1-A Peak MOSFET Gate Driver - Input Undervoltage and Output Overvoltage Protection - PWM and Analog Dimming - Cycle-by-Cycle Current Limit - Programmable Switching Frequency - Zero Current Shutdown and Thermal Shutdown - LED Output Status Flag (LM3423 and LM3423-Q0 Only) - Fault Status Flag and Timer(LM3423 and LM3423-Q0 Only) 2 Applications - LED Drivers: Buck, Boost, Buck-Boost, and SEPIC - Indoor and Outdoor Area SSL - Automotive - General Illumination - Constant-Current Regulators 3 Description The LM3421 and LM3423 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 and LM3423 devices use predictive off-time (PRO) control, which is a bination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop pensation while providing inherent input voltage feed-forward pensation. The LM3421 and LM3423 devices include a highvoltage 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 pact solutions. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LM3421 HTSSOP (16) 5.00 mm × 4.40 mm HTSSOP (20) 6.50 mm × 4.40 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Boost Application 1 VIN HSN 16 2 EN HSP...