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LM3686 Fiches technique(PDF) 1 Page - Texas Instruments |
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LM3686 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 27 page LM3686 www.ti.com SNVS520E – AUGUST 2008 – REVISED MAY 2013 LM3686 Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator Check for Samples: LM3686 1 FEATURES APPLICATIONS 2 DC-DC REGULATOR • Moblie TV • VOUT_DCDC = 1.2V to 2.5V (in 100 mV Steps - • Hand-Held Radios Factory Programmed) • Personal Digital Assistants • 600 mA Maximum Load Capability (LILO = • Palm-top PCs OFF) • Portable Instruments • 3 MHz PWM Fixed Switching Frequency (Typ.) • Battery-Powered Devices • Automatic PFM/PWM Mode Switching • Portable Personal Clients • Internal Synchronous Rectification for High Efficiency DESCRIPTION • Internal Soft Start The LM3686 is a step-down DC-DC converter with one integrated very low dropout linear regulator and a DUAL RAIL LINEAR REGULATOR: LILO low noise linear regulator optimized for powering • Load Transients < 50 mV Peak Typ. ultra-low voltage circuits from a single Li-Ion cell or 3 • Line Transients < 1 mV Peak Typ. cell NiMH/NiCd batteries. It provides three outputs with combined load current up to 900 mA over an • VOUT_LILO = 0.7V to 2.0V (in 50 mV Steps - input voltage range from 2.7V to 5.5V. Factory Programmed) • 70 µA Typical IQ From VIN_LILO The device offers superior features and performance for many applications. Automatic intelligent switching • 350 mA Maximum Load Capability (Large FET) between PWM low-noise and PFM low-current mode LINEAR REGULATOR: LDO offers improved system control. During full-power • Load Transients < 80 mV Peak Typ. operation, a fixed-frequency 3 MHz (typ.), PWM mode drives loads from ~70 mA to 600 mA max. • Line Transients < 1 mV Peak Typ. Hysteretic PFM mode extends the battery life through • VOUT_LDO = 1.5V to 3.3V (in 100 mV Steps - reduction of the quiescent current to 28 μA (typ.) at Factory Programmed) light load and system standby. Internal synchronous • 50 µA Typical IQ rectification provides high efficiency. • 300 mA Maximum Load Capability Three enable pins allow the separate operation of COMBINED GLOBAL FEATURES either the DC-DC, post-regulation linear regulator or the linear regulator alone. If the DC-DC is not • VBATT ≥ VOUT_LILO + 1.5V or 2.7V, Whichever is enabled during startup of the post-regulation linear Higher regulator, a parallel small pass transistor supplies the • 900 mA Maximum Combined Load Capability linear regulator from VBATT with maximal 50 mA. In • Operates From a Single Li-Ion Cell or 3 Cell the combined operation where both enables are raised together, the small pass transistor is NiMH/NiCd Batteries deactivated and the big pass transistor provides 350 • Only Six Tiny Surface-mount External mA output current. In shutdown mode (Enable pins Components Required (One Inductor, Five pulled low), the device turns off and reduces battery Ceramic Capacitors) consumption to 2.5 μA (typ.). • 12–bump DSBGA • 100 µA Iq From VBATT • 15.66 mm2 Total Solution Size 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 © 2008–2013, 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. |
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