Analog Devices Inc. ADP5600 Interleaved Inverting Charge Pump

Analog Devices Inc. ADP5600 Interleaved Inverting Charge Pump features two charge pump blocks that operate in an interleaving manner, enabling greatly reduced input and output voltage ripple without sacrificing efficiency, output resistance, or ease-of-use compared to inductor-based solutions. The ADP5600 also integrates a negative low dropout (LDO) linear regulator, which controls the output voltage and filters out low-frequency spurious signals.

The ADP5600 Charge Pump operates via resistor programming or external clock synchronization, with a switching frequency range of 100kHz to 1MHz. Operating at a higher switching frequency allows the use of small input, output, and fly capacitors. To combine the high switching frequency with internal field effect transistors (FETs), compensation, and soft start gives a best-in-class total solution size for negative rail generation.

The ADP5600 also features comprehensive fault protection for robust applications. These protections include overload protection, shorted fly capacitor protection, undervoltage lockout (UVLO), and thermal shutdown. For easy sequencing, the ADP5600 has a power-good pin.

The integrated LDO of the ADP5600 uses an advanced proprietary architecture to provide high power supply rejection. It also achieves a decent line and load transient response with only a small 2.2μF ceramic output capacitor. The output can be configured via the SEL1 and SEL2 pins to one of four fixed output voltages. This output is adjustable from -0.505V to -V_IN +0.5V via an external feedback divider.

The Analog Devices Inc. ADP5600 Interleaved Inverting Charge Pump is offered in a 4mm x 4mm LFCSP16 package, with a wide -40°C to +125°C operating temperature range.