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LM3686 데이터시트(PDF) 1 Page - Texas Instruments |
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LM3686 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 28 page LM3686 www.ti.com SNVS520D – AUGUST 2008 – REVISED MARCH 2011 LM3686 Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator Check for Samples: LM3686 1 FEATURES COMBINED GLOBAL FEATURES 2 DC-DC REGULATOR • VBATT ≥ VOUT_LILO + 1.5V or 2.7V, whichever is higher • VOUT_DCDC = 1.2V to 2.5V ( in 100 mV steps - • 900 mA maximum combined load capability factory programmed ) • Operates from a single Li-Ion cell or 3 cell • 600 mA maximum load capability (LILO = OFF) NiMH/NiCd batteries • 3 MHz PWM fixed switching frequency (typ.) • Only six tiny surface-mount external • Automatic PFM/PWM mode switching components required (one inductor, five • Internal synchronous rectification for high ceramic capacitors) efficiency • 12–bump micro SMD • Internal soft start • 100 µA Iq from VBATT DUAL RAIL LINEAR REGULATOR: LILO • 15.66 mm2 total solution size • Load transients < 50 mV peak typ. • Line transients < 1 mV peak typ. APPLICATIONS • VOUT_LILO = 0.7V to 2.0V ( in 50 mV steps - • Moblie TV factory programmed ) • Hand-Held Radios • 70 µA typical IQ from VIN_LILO • Personal Digital Assistants • 350 mA Maximum Load Capability (Large FET) • Palm-top PCs LINEAR REGULATOR: LDO • Portable Instruments • Load transients < 80 mV peak typ. • Battery-Powered Devices • Line transients < 1 mV peak typ. • Portable Personal Clients • VOUT_LDO = 1.5V to 3.3V ( in 100 mV steps - factory programmed ) • 50 µA typical IQ • 300 mA Maximum Load Capability DESCRIPTION The LM3686 is a step-down DC-DC converter with one integrated very low dropout linear regulator and a low noise linear regulator optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides three outputs with combined load current up to 900 mA over an input voltage range from 2.7V to 5.5V. The device offers superior features and performance for many applications. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During full-power operation, a fixed-frequency 3 MHz (typ.), PWM mode drives loads from ~70 mA to 600 mA max. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 28 μA (typ.) at light load and system standby. Internal synchronous rectification provides high efficiency. Three enable pins allow the separate operation of either the DC-DC, post-regulation linear regulator or the linear regulator alone. If the DC-DC is not enabled during startup of the post-regulation linear regulator, a parallel small pass transistor supplies the linear regulator from VBATT with maximal 50 mA. In the combined operation where both enables are raised together, the small pass transistor is deactivated and the big pass transistor provides 350 mA output current. In shutdown mode (Enable pins pulled low), the device turns off and reduces battery consumption to 2.5 μA (typ.). 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 © 2008–2011, 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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