LM3421MH

LM3421MH, TSSOP, n-channel controller, -0.3V to 7.0V, -100μA

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Price:: US $0.30~0.50 / piece [Get Latest Price]

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Qty (lots)	Price/lot
1 ~ 1000 :	0.50 / Piece
1001 ~ 10000 :	0.40 / Piece
10001 ~ 100000 :	0.30 / Piece

PartNumber:: LM3421MH

Brand:: National Semiconductor - NS | Pack: TSSOP | D/C: 13+

Availability:: Supply Ability: 10000/Day Can Ship Immediately
Delivery: 10-15 Business Days (ships out within 3 Business days)

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Products Upload time: 2013-07-26

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Part Number:LM3421MH
US $0.30 - 0.50
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Product Summary

The LM3421MH is an n-channel controller for constant current led drivers. The LM3421MH devices are versatile high voltage LED driver controllers. With the capability to be configured in a Buck, Boost, Buck-Boost (Flyback), or SEPIC topology, and an input operating voltage rating of 75V, these controllers areideal for illuminating LEDs in a very diverse, large family of applications. Adjustable high-side current sense with a typical sense voltage of 100mV allows for tight regulation of the LED current with the highest efficiency possible. Output LED current regulation is based on peak current-mode control with predictive Off-Time Control. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation. The LM3421MH also includes an LED output status flag, a fault flag, a programmable fault timer, and a logic input to select the polarity of the dimming output driver. The LM3421MH can be applied in LED Drivers, Constant-Current Buck-Boost Regulator, Constant-Current Boost Regulator, Constant-Current Flyback Regulator, Constant-Current SEPIC Regulator, and Thermo-Electric Cooler (Peltier) Drive.

Parametrics

LM3421MH absolute maximum ratings: (1)VIN,EN, PD, nDIM: -0.3V to 76.0V; (2)DPOL: -100μA continuous; (3)RCT: -0.3V to 76.0V; (4)VCC: -0.3V to 8.0V; (5)TIMR: -0.3V to 7.0V; (6)GATE, DDRV: -0.3V to VCC; (7)Maximum Junction Temperature (Internally Limited): 165°C; (8)torage Temperature Range -65°C to +150°C.

Features

LM3421MH features: (1)VIN range from 4.5V to 75V; (2)2% Internal reference voltage (1.235V); (3)Current sense voltage adjustable from 20mV; (4)High-side current sensing; (5)2Ω MOSFET gate driver; (6)Dimming MOSFET gate driver; (7)Input under-voltage protection; (8)Over-voltage protection; (9)Low shutdown current, IQ< 1μA; (10)Fast (50kHz) PWM dimming; (11)Cycle-by-cycle current limit; (12)Programmable switching frequency; (13)LED output status flag (LM3423 only); (14)Fault timer pin (LM3423 only); (15)TSSOP EP 16-lead package (LM3421); (16)TSSOP EP 20-lead package (LM3423).