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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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NX2139A Scheda tecnica(PDF) 1 Page - Microsemi Corporation |
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NX2139A Scheda tecnica(HTML) 1 Page - Microsemi Corporation |
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1 / 21 page  NX2139A 1 Rev. 2.3 03/19/09 TYPICAL APPLICATION DESCRIPTION The NX2139A controller IC is a compact Buck control- ler IC with 16 lead MLPQ package designed for step down DC to DC converter in portable applications. It can be selected to operate in synchronous mode or non-synchronous mode to improve the efficiency at light load.Constant on time control provides fast response, good line regulation and nearly constant frequency un- der wide voltage input range. The NX2139A controller is optimized to convert single supply up to 24V bus voltage to as low as 0.75V output voltage. Over cur- rent protection and FB UVLO followed by latch fea- ture. A built-in LDO controller can drive an external N- MOSFET to provide a second output voltage from ei- ther PWM output source or other power source. Both PWM controller and LDO controller have separate EN feature. Other features includes: 5V gate drive capa- bility, power good indicator, over voltage protection, internal Boost schottky diode and adaptive dead band control. n Internal Boost Schottky Diode n Ultrasonic mode operation available n Bus voltage operation from 4.5V to 24V n Less than 1uA shutdown current with Enable low n Excellent dynamic response with constant on time control n Selectable between Synchronous CCM mode and diode emulation mode to improve efficiency at light load n Programmable switching frequency n Current limit and FB UVLO with latch off n Over voltage protection with latch off n LDO controller with seperate enable n Two independent Power Good indicator available n Pb-free and RoHS compliant ORDERING INFORMATION FEATURES SINGLE CHANNEL MOBILE PWM AND LDO CONTROLLER APPLICATIONS n Notebook PCs and Desknotes n Tablet PCs/Slates n On board DC to DC such as 12V to 3.3V, 2.5V or 1.8V n Hand-held portable instruments PRELIMINARY DATA SHEET Figure1 - Typical application of NX2139A Device Temperature Package Pb-Free NX2139ACMTR -10o C to 100o C 3X3 MLPQ-16L Yes Pb Free Product VIN 7V~22V TON HDRV BST SW LDRV OCSET FB VOUT ENSW /MODE 5V 10 VCC PVCC PGOOD Vout 1.8V/7A GND 1.5V@2A LDODRV LDOFB ENLDO LDOPG 5V LDOPG PGOOD 1MEG 4 9 2 15 14 5 PAD 6 7 3 1 10 8 11 13 12 16 100k 1u 1u 100k 50 33n 20k 1n 7.5k 7.5k 7.5k 2x10uF 10.5k 2R5TPE330MC 5k 1u 2x10uF 1n IRF7807 AO4714 1.5uH 330uF M3 SI4800 330p 2.2 |
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