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LM27961 データシート(PDF) 1 Page - Texas Instruments |
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LM27961 データシート(HTML) 1 Page - Texas Instruments |
1 / 16 page CIN 1 PF 3/2x Charge Pump (1x when VIN > 4.7V) C1 1 PF C2 1 PF CPOUT 1 PF ENA ENB C1+ C1- C2+ C2- POUT D1B D2B D3B ISETB VIN VIN 2.7V to 5.5V RSETB GND LM27961 Capacitors: TDK C1608X5R1A105K, or equivalent D1A D2A D3A D4A ISETA RSETA LM27961 www.ti.com SNVS326 – NOVEMBER 2004 LM27961 Dual-Display White LED Driver with 3/2x Switched Capacitor Boost Check for Samples: LM27961 1 FEATURES 2 • Drives 4 Individual Common-Anode LEDs with • PWM Brightness Control: 100Hz - 1kHz up to 20mA each for a Main Display Backlight • 18-bump Thin Micro SMD Package: (2.1mm x • Drives 3 Individual Common-Cathode LEDs 2.4mm x 0.6mm) with up to 20mA each for a Sub-Display Backlight APPLICATIONS • Independent Resistor-Programmable Current • Mobile Phone Display Lighting Setting • Mobile Phone Keypad Lighting • Excellent Current and Brightness Matching • PDAs • High-Efficiency 3/2x Charge Pump • General LED Lighting • Extended Li-Ion Input: 2.7V to 5.5V DESCRIPTION The LM27961 is a charge-pump-based white-LED driver that is ideal for mobile phone display backlighting. It is intended to drive 4 LEDs for a main phone display backlight and 3 LEDs for a sub-display backlight. Regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED driver current sources are split into two independently controlled groups. The primary group (Group A) can be used to backlight a main phone display with up to 4 LEDs. The low-side current drivers of Group A accommodate common-anode-type LEDs. The second group (Group B) can backlight a secondary display with up to 3 LEDs. The high-side current drivers of Group B accommodate common-cathode-type LEDs. Both Group A and Group B can also drive standard two-terminal LEDs, and provide other general lighting functions (keypad lighting, fun lighting, etc). The brightness of the two LED groups can be adjusted independently with external resistors. The LM27961 works off an extended Li-Ion input voltage range (2.7V to 5.5V). Voltage boost is achieved with a high-efficiency 3/2×-gain charge pump. The LM27961 is available in National’s chip-scale 18-bump micro SMD package. Typical Application Circuit 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, 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. |
同様の部品番号 - LM27961 |
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同様の説明 - LM27961 |
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