(China (Mainland))
Product Summary
The MC34844AEPR2 is a high efficiency, LED driver for use in backlighting LCD displays from 10" to 20"+. Operating from supplies of 7.0 to 28V, the MC34844AEPR2 is capable of driving up to 160 LEDs in 10 parallel strings. Current in the 10 strings is matched to within ±2%, and can be programmed via the I2C/SM Bus interface.
Parametrics
Absolute maximum ratings: (1)Ambient Temperature Range: -40 to 105℃; (2)Junction to Ambient Temperature: 32℃/W; (3)Junction to Case Temperature: 3.5℃/W; (4)Maximum junction temperature: 150 ℃; (5)Storage temperature range: -40 to 150℃; (6)Peak Package Reflow Temperature During Reflow: 260℃; (7)Power Dissipation: 3.9 W at TA = 25℃, 2.5 W at TA = 70℃.
Features
Features: (1)Input voltage of 7.0 to 28V; (2)2.5A integrated boost FET; (3)up to 50 mA on the 34844 LED current per channel; (4)up to 80 mA on the 34844A LED current per channel; (5)90% efficiency (DC:DC); (6)I2C/SM Bus interface; (7)10 channel current mirror with ?% current matching; (8)Boost output voltage up to 60V, with Dynamic Headroom Control (DHC); (9)PWM frequency programmable or synchronizable from 100 to 25,000 Hz for the 34844; (10)PWM frequency programmable or synchronizable from 110 to 27,000 Hz for the 34844A; (11)32-Ld 5x5x1.0mm TQFN Package; (12)Pb-free packaging designated by suffix code EP.
Diagrams
| Image | Part No | Mfg | Description |  |
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 MC34844AEPR2 |
Freescale Semiconductor |
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