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LM2771 Scheda tecnica(PDF) 1 Page - Texas Instruments |
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LM2771 Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 16 page LM2771 VIN VOUT EN Capacitors: 1 PF - TDK C1005X5R1A105K 4.7 PF - TDK C1608X5R0J475K or equivalent VIN = 3.0V to 5.5V Cfly 1 PF CIN 1 PF COUT 4.7PF VOUT: 1.5V IOUT up to 250 mA C1+ C1- GND LM2771 www.ti.com SNVS435 – MARCH 2006 LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter Check for Samples: LM2771 1 FEATURES • No Inductors…Small Solution Size • Current Limit and Thermal Protection 2 • Low-Noise Fixed Frequency Operation • WSON-10 Package (3mm × 3mm × 0.8mm) • 1.5V Output Voltage • Li-Ion (3.6V) to 1.5V with 81% Efficiency APPLICATIONS • 1.7% Output Voltage Accuracy • DSP, Memory, and Microprocessor Power • Very Low Output Ripple: 8mV @ 250mA Supplies • Output Currents up to 250mA • Mobile Phones and Pagers • 2.7V to 5.5V Input Range • Portable Electronic Devices • Shutdown Disconnects Load from VIN • 1.1MHz Switching Frequency DESCRIPTION The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output without the use of an inductor. It is capable of supplying loads up to 250mA. The LM2771 operates with an input voltage from 2.7V to 5.5V, and requires only 3 low-cost ceramic capacitors. The LM2771 uses a regulated 0.5x charge pump to give power conversion efficiencies nearly twice as high as an LDO. Pre-regulated 1.1MHz fixed-frequency switching results in very low ripple and noise on both the input and the output. When output currents are low (<30mA typ.), the part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load range. At input voltages below 3.5V (Typ), the charge pump goes into pass mode, with efficiencies similar to an LDO. The LM2771 is available in National’s 10-pad Leadless Leadframe No-Pullback Package (WSON-10). Typical Application Circuit LM2771 Efficiency vs. Low-Dropout Linear Regulator (LDO) Efficiency 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2006, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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