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LM3670MF-1.2 Folha de dados(PDF) 1 Page - Texas Instruments |
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LM3670MF-1.2 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 25 page 1 2 5 4 3 VIN SW FB EN GND L1:10uH VOUT COUT 10uF CIN 4.7uF LM3670 VIN 2.5V to 5.5V LM3670 www.ti.com SNVS250E – NOVEMBER 2004 – REVISED FEBRUARY 2013 LM3670 Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits Check for Samples: LM3670 1 FEATURES APPLICATIONS 2 • VOUT = Adj (0.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, • Mobile Phones 2.5, 3.3V • HandHeld • 2.5V ≤ VIN ≤ 5.5V • PDAs • 15 µA Typical Quiescent Current • Palm-Top PCs • 350 mA Maximum Load Capability • Portable Instruments • 1 MHz PWM Fixed Switching Frequency (typ.) • Battery Powered Devices • Automatic PFM/PWM Mode Switching DESCRIPTION • Available in Fixed Output Voltages as well as The LM3670 step-down DC-DC converter is an Adjustable Version optimized for powering ultra-low voltage circuits from • SOT-23-5 Package a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It • Low Drop Out Operation - 100% Duty Cycle provides up to 350 mA load current, over an input Mode voltage range from 2.5V to 5.5V. There are several different fixed voltage output options available as well • Internal Synchronous Rectification for High as an adjustable output voltage version. Efficiency • Internal Soft Start The device offers superior features and performance for mobile phones and similar portable applications • 0.1 µA Typical Shutdown Current with complex power management systems. Automatic • Operates from a Single Li-Ion Cell or 3 Dell intelligent switching between PWM low-noise and NiMH/NiCd Batteries PFM low-current mode offers improved system • Only Three Tiny Surface-Mount External control. During full-power operation, a fixed-frequency 1 MHz (typ). PWM mode drives loads from ∼70 mA to Components Required (One Inductor, Two 350 mA max, with up to 95% efficiency. Hysteretic Ceramic Capacitors) PFM mode extends the battery life through reduction • Current Overload Protection of the quiescent current to 15 µA (typ) during light current loads and system standby. Internal synchronous rectification provides high efficiency (90 to 95% typ. at loads between 1 mA and 100 mA). In shutdown mode (Enable pin pulled low) the device turns off and reduces battery consumption to 0.1 µA (typ.). Typical Application Figure 1. Fixed Output Voltage 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 © 2004–2013, 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. |
Nº de peça semelhante - LM3670MF-1.2 |
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Descrição semelhante - LM3670MF-1.2 |
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