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LM22671 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM22671 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 18 page  LM22671/LM22671Q December 10, 2010 500 mA SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features General Description The LM22671 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 500 mA loads with excellent line and load regulation characteris- tics. 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 1 MHz. It is also possible to self- synchronize multiple regulators to share the same switching frequency. The LM22671 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. An adjustable soft-start feature is provided by selecting an appropriate external soft-start capacitor. Features ■ Wide input voltage range: 4.5V to 42V ■ Internally compensated voltage mode control ■ Stable with low ESR ceramic capacitors ■ 200 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 ■ Adjustable soft-start ■ Fully WEBENCH® enabled ■ Step-down and inverting buck-boost applications ■ LM22671Q is an Automotive Grade product that is AEC- Q100 grade 1 qualified (-40°C to +125°C operating junction temperature) Package ■ PSOP-8 (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 30076801 © 2010 National Semiconductor Corporation 300768 www.national.com |
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