The ADP1621 is a constant-frequency, current-mode step-up DC/DC controller that provides up to 92% efficiency, supports external high voltage input (>5.5V), features undervoltage lockout, external slope compensation, programmable operating frequency, lossless current sensing, synchronization to external clock, current limiting and thermal overload protection.
The ADP1621 is a fixed‑frequency PWM current‑mode step‑up converter controller that drives an external n‑channel MOSFET to raise the input voltage. It can also be used in flyback, SEPIC, and forward topologies, both isolated and non‑isolated, and eliminates a current‑sense resistor by measuring the MOSFET’s on‑resistance voltage drop.
Key features include 92 % efficiency, programmable operating frequency from 100 kHz to 1.5 MHz, internal soft‑start, current‑limit and thermal‑shutdown protection, and a wide input voltage range down to 1 V for low‑power applications. The device is supplied in a 10‑lead MSOP package and is suited for portable electronics, LED drivers, LCD backlighting, and isolated DC‑DC converters.
| Input Supply Voltage (Vin) | 2.9 V to 5.5 V |
|---|---|
| Operating Frequency Range | 100 kHz to 1.5 MHz |
| Thermal Shutdown Threshold | 150 °C |
| Efficiency | up to 92 % |
| Package | 10‑lead MSOP |
The device operates with an input supply voltage from 2.9 V up to 5.5 V.
The switching frequency is programmed by connecting an external resistor to the FREQ pin, allowing a range of 100 kHz to 1.5 MHz.
It provides current‑limit, thermal shutdown at ~150 °C, undervoltage lockout, and a shutdown pin that can turn the device off.
The controller is offered in a 10‑lead Mini Small Outline Package (MSOP).