The LM2757 is a constant-frequency pre-regulated switched-capacitor charge pump that
1.25 MHz to produce a low-noise regulated output voltage. The device can be configured to
provide up to 100 mA at 4.1 V, 110 mA at 4.5 V, or 180 mA at 5 V. 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.
The LM2757 device comes in a tiny 12-pin 0.4-mm pitch DSBGA package. A perfect fit for
space-constrained, battery-operated applications, the device requires only 4 small, inexpensive
ceramic capacitors. Built-in soft-start, overcurrent protection, and thermal shutdown features are
also included in this device.
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