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LM2757 Datasheet(PDF) 1 Page - Texas Instruments |
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LM2757 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 20 page LM2757 VIN C2+ C2- 1 µF 0.47 µF VOUT 1.0 µF C1+ C1- 0.47 µF *Bump D1 is (NC) No Connect VIN = 3.0V - 5.5V B2,B3 A3 B1 A1 C3 C1,C2 A2 GND VOUT = 4.1V (100 mA), 4.5V (110 mA) 5.0V (180 mA) M0 D3 M1 D2 COUT C2 C1 CIN LM2757 www.ti.com SNVS536D – OCTOBER 2007 – REVISED AUGUST 2009 LM2757 Switched Capacitor Boost Regulator with High Impedance Output in Shutdown Check for Samples: LM2757 1 FEATURES 2 • Dual gain converter (2x, 3/2x) with up to 93% • Tiny 1.2 mm X 1.6 mm X 0.4 mm pitch, Efficiency. 12–bump micro SMD package. • Inductorless solution uses only 4 small APPLICATIONS ceramic capacitors. • USB/USB-OTG/HDMI Power • Total solution area < 12mm2. • Supercapacitor Charger • True input-output and output-input disconnect. • Keypad LED Drive • Up to 180 mA output current capability (5V). • Audio amplifier power supply • Selectable 4.1V, 4.5V or 5.0V output. • Low-current Camera Flash • Pre-regulation minimizes input current ripple. • General Purpose Li-Ion-to-5V Conversion • 1.24 MHz switching frequency for a low-noise, low-ripple output voltage. • Cellular Phone SIM cards • Integrated Over Current and Thermal Shutdown Protection. DESCRIPTION The LM2757 is a constant frequency pre-regulated switched-capacitor charge pump that operates at 1.25 MHz to produce a low-noise regulated output voltage. The device can be configured to provide up to 100 mA at 4.1V, 110 mA at 4.5V, or 180 mA at 5V. Excellent efficiency is achieved without the use of an inductor by operating the charge pump in a gain of either 3/2 or 2 according to the input voltage and output voltage option selection. The LM2757 presents a high impedance at the VOUT pin when shut down. This allows for use in applications that require the regulated output bus to be driven by another supply while the LM2757 is shut down. A perfect fit for space-constrained, battery-operated applications, the LM2757 requires only 4 small, inexpensive ceramic capacitors. LM2757 is a tiny 1.2 mm X 1.6 mm 12–bump micro SMD device. Built in soft-start, over- current protection, and thermal shutdown features are also included in this device. 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 © 2007–2009, 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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