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LM22677TJE-5.0 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM22677TJE-5.0 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
1 / 16 page LM22677/LM22677Q December 10, 2010 5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency General Description The LM22677 series of regulators are monolithic integrated circuits which provide all of the active functions for a step- down (buck) switching regulator capable of driving up to 5A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance N-channel MOSFET. The series consists of a fixed 5V output and an adjustable version. The SIMPLE SWITCHER® concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH® design tool. National’s WEBENCH® tool includes features such as exter- nal component calculation, electrical simulation, thermal sim- ulation, and Build-It boards for easy design-in. The switching clock frequency is provided by an internal fixed frequency os- cillator which operates at 500 kHz. The switching frequency can also be adjusted with an external resistor or synchronized to an external clock up to 1MHz. It is also possible to self- synchronize multiple regulators to share the same switching frequency. The LM22677 series also has built in thermal shut- down, current limiting and an enable control input that can power down the regulator to a low 25 µA quiescent current standby condition. Features ■ Wide input voltage range: 4.5V to 42V ■ Internally compensated voltage mode control ■ Stable with low ESR ceramic capacitors ■ 100 mΩ N-channel MOSFET ■ Output voltage options: -ADJ (outputs as low as 1.285V) -5.0 (output fixed to 5V) ■ ±1.5% feedback reference accuracy ■ Switching frequency of 500 kHz, adjustable between 200 kHz and 1 MHz ■ -40°C to 125°C operating junction temperature range ■ Precision enable pin ■ Integrated boot diode ■ Integrated soft-start ■ Fully WEBENCH® enabled ■ Step-down and inverting buck-boost applications ■ LM22677Q is an Automotive Grade product that is AEC- Q100 grade 1 qualified (-40°C to +125°C operating junction temperature) Package ■ TO-263 THIN (Exposed Pad) Applications ■ Industrial Control ■ Telecom and Datacom Systems ■ Embedded Systems ■ Automotive Telematics and Body Electronics ■ Conversions from Standard 24V, 12V and 5V Input Rails Simplified Application Schematic 30074101 © 2010 National Semiconductor Corporation 300741 www.national.com |
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