Features • Dual gain converter (2x, 3/2x) with up to 93% Efficiency. • Inductorless solution uses only 4 small ceramic capacitors. • Total solution area < 12mm 2. • True input-output and output-input disconnect. • Up to 180 mA output current capability (5V). • Selectable 4.1V, 4.5V or 5.0V output. • Pre-regulation minimizes input current ripple. • 1.24 MHz switching frequency for a low-noise, low-ripple output voltage. • Integrated Over Current and Thermal Shutdown Protection. • Tiny 1.2 mm X 1.6 mm X 0.4 mm pitch, 12–bump micro SMD package. 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. Applications • USB/USB-OTG/HDMI Power • Supercapacitor Charger • Keypad LED Drive • Audio amplifier power supply • Low-current Camera Flash • General Purpose Li-Ion-to-5V Conversion • Cellular Phone SIM cards

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Datasheet

Title		Size	Date	Other Language
	LM2757 Switched Capacitor Boost Regulator with High Impedance Output in Shutdown	767 Kbytes	26-Aug-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1731: Application Note 1731 LM2757 Evaluation Board	573 Kbytes	19-Feb-08
	AN-1998: Application Note 1998 How to Meet the HDMI 5V Source Requirement	117 Kbytes	28-Aug-09
	AN-1777: Application Note 1777 Designing Energy-Efficient Handheld Illumination Solutions	156 Kbytes	27-Feb-08	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1269: Application Note 1269 LM2750-5.0 Evaluation Board	233 Kbytes	2-Oct-03
	AN-1302: Application Note 1302 LM2750-ADJ Evaluation Board	194 Kbytes	26-Mar-04
	AN-1546: Application Note 1546 LM2754 Evaluation Board	927 Kbytes	3-Nov-06	中文
	AN-1778: Application Note 1778 LM2755 Charge Pump LED Controller with I2C Compatible Interface in µSMD	4110 Kbytes	30-Apr-08
	AN-1779: Application Note 1779 LM2756 Multi-Display Inductorless LED Driver with 32 Exponential Dimming Steps in µSMD	2288 Kbytes	31-Mar-08
	AN-1695: Application Note 1695 LM2758 Flash LED Driver Evaluation Board	347 Kbytes	9-Apr-08