The LM27761 low-noise regulated switched-capacitor voltage inverter delivers a very low-noise adjustable output for an input voltage in the range of 2.7 V to 5.5 V. Four low-cost capacitors are used in the application solution to provide up to 250 mA of output current. The regulated output for the device is adjustable between −1.5 V and −5 V. The LM27761 operates at 2-MHz (typical) switching frequency to reduce output resistance and voltage ripple. With an operating current of only 370 µA (charge-pump power efficiency greater than 80% with most loads) and 7-µA typical shutdown current, the LM27761 provides ideal performance when driving power amplifiers, DAC bias rails, and other high-current, low-noise voltage applications.
Changes from B Revision (February 2016) to C Revision
Changes from A Revision (December 2015) to B Revision
Changes from * Revision (October 2015) to A Revision
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NUMBER | NAME | ||
1 | VIN | P | Positive power supply input. |
2 | GND | G | Ground |
3 | CPOUT | P | Negative unregulated output voltage. |
4 | VOUT | P | Regulated negative output voltage. |
5 | VFB | P | Feedback input. Connect VFB to an external resistor divider between VOUT and GND. DO NOT leave unconnected. |
6 | EN | I | Active high enable input. |
7 | C1– | P | Negative terminal for C1. |
8 | C1+ | P | Positive terminal for C1. |
— | Thermal Pad | G | Ground. DO NOT leave unconnected. |