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LM27951 データシート(PDF) 1 Page - Texas Instruments |
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LM27951 データシート(HTML) 1 Page - Texas Instruments |
1 / 20 page LM27951 C2 VIN C2+ C2- D1 CIN COUT VOUT D4 PWM D4 C1 C1+ C1- VIN = 3 V to 5.5 V IDX = 30 mA max ISET GND EN D2 D3 D3 D2 D1 RSET Product Folder Sample & Buy Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LM27951 SNVS416C – NOVEMBER 2005 – REVISED FEBRUARY 2016 LM27951 White LED Adaptive 1.5×/1× Switched-Capacitor Current Driver 1 1 Features 1 • Input Voltage Range: 2.8 V to 5.5 V • Drives up to Four LEDs With up to 30 mA each • Regulated Current Sources with 0.2% (Typical) Matching • 3/2×, 1× Gain Transition Based on LED Vƒ • Peak Efficiency Over 85% • PWM Brightness Control • Very Small Solution Size - No Inductor • Fixed 750-kHz Switching Frequency • < 1-µA Shutdown Current 2 Applications • White LED Display Backlights • White LED Keypad Backlights • General Purpose LED Lighting 3 Description The LM27951 is a switched capacitor white-LED driver capable of driving up to four LEDs with 30 mA through each LED. Its four tightly regulated current sources ensure excellent LED current and brightness matching. LED drive current is programmed by an external sense resistor. The LM27951 operates over an input voltage range from 2.8 V to 5.5 V and requires only four low-cost ceramic capacitors. The LM27951 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in a gain of 1. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage requirements. The LM27951 uses constant frequency pre-regulation to minimize conducted noise on the input. It has a fixed 750-kHz switching frequency optimized for portable applications. The LM27951 consumes less than 1 µA of supply current when shut down. The LM27951 is available in a 14-pin no-pullback WSON package. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LM27951 WSON (14) 4.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Schematic |
同様の部品番号 - LM27951 |
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同様の説明 - LM27951 |
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