PDF LX1911 Data sheet ( Hoja de datos )

Número de pieza	LX1911
Descripción	1.5A - 1.1MHZ PWM Step-Down Regulator
Fabricantes	Microsemi
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No Preview Available ! LX1911www.DataSheet4U.com ® 1.5A, 1.1MHZ PWM Step-Down Regulator TM PRODUCTION DATA SHEET DESCRIPTION The LX1911 operates as a Current Mode PWM Buck regulator that switches to PFM mode with light loads. The entire regulator function is implemented with minimal external components. The LX1911 responds quickly to dynamic load changes using a high bandwidth error amplifier and internal compensation. Tight output voltage regulation is maintained with the compensated 800mV, ±2% reference (line and temp regulation). With two external resistors the output voltage is easily programmed, from 800mV to 90% of VIN. The regulator is capable of providing an output load current of 1.5A and has no minimum load current requirement for stable operation. Current limit is cycle-by-cycle to protect the switch. Power conversion efficiency is maximized with a low regulator IQ and PFM mode of operation. The LX1911 operational range covers 4.0V to 6.0V, features include power on delay; soft start to limit inrush currents; and thermal shutdown during fault conditions. The 6-pin package is a small, RoHS compliant / Pb-free, MO-229 with excellent power dissipation capacity. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com KEY FEATURES Internal Reference 800mv ±2% Accuracy (Line and Temp.) 4.0V to 6.0V Input Range Internal Soft Start Adj. Output From 0.8V to VIN Output Current (I >1.5A) Quiescent Current < 550μA, typical @ 23°C 1.1MHz PWM Frequency Micro Lead-frame, Thin MO- 229, 6-Pin Package APPLICATIONS/BENEFITS Portable Microprocessor Core Voltage Supplies 5V to 3V PRODUCT HIGHLIGHT 4.0 to 6V 4.7µF 4 VINPOWER 5 VINANALOG 2 GND LX1911 6 N.C. 3 SW 1 FB C 10 C = 680p 100% 90% 80% 3.3µH 1.2V @ 1.5A 25K 20µF 50K Ground Range Tie-in 70% 60% 50% 40% 30% 1 EFFICIENCY vs IOUT (VIN=5V) Top VO=3.375V Lower VO=1.25V 10 100 1000 10000 mA Figure 1 – LX1911 Circuit Topology and Typical Efficiency Performance TA (°C) PACKAGE ORDER INFO Input Voltage Output Voltage Range Plastic MO-229 LD 6 Pin 3mm² RoHS Compliant / Pb-free 0 to 70 4.5V – 5.5V Adjustable LX1911CLD For Tape & Reel, append the letters “TR” to the part number. (i.e. LX1911CLD-TR) Part Markings Copyright © 2004 Rev. 1.1, 2006-05-15 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 1 page LX1911www.DataSheet4U.com ® 1.5A, 1.1MHZ PWM Step-Down Regulator TM PRODUCTION DATA SHEET CHARACTERISTIC CURVES CH2:VOUT CH1:SWITCH Figure 4– Step Load Response 250ma-1.2A 3.3µH, 40µF Blue: Vout 50mV/div AC; Green: ISTEP 200ma/div Figure 5 – Switching Waveforms: PFM Mode CH1:VIN CH2:VOUT Figure 6 – Power On and Soft Start For IOUT 10mA to 1amp Regulated VOUT vs Temperature (Iout=10ma) 0.8% 0.6% 0.4% 0.2% 0.0% -0.2% -0.4% -0.6% -0.8% -25 0 25 50 75 100 125 150 TEMPERATURE, °C Figure 7– Vout Temperature Stability Copyright © 2004 Rev. 1.1, 2006-05-15 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 5 Page

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