LTC3830/LTC3830-1 3830fa high power step-down synchronous DC/DC controllers for low voltage operation
The LTC3830/LTC3830-1 series are high‑power synchronous step‑down (buck) controller ICs designed for 3.3 V‑5 V to 1.x V‑3.x V conversion. They feature a precision internal reference, +1 % output regulation, and an adjustable fixed‑frequency oscillator from 100 kHz to 500 kHz. The devices operate from a low input voltage of 3 V, achieve over 95 % efficiency, and include built‑in over‑temperature protection.
Typical applications include CPU power supplies, multiple logic supply generation, and distributed power systems. The 16‑lead versions provide current‑limit sensing, soft‑start, and external clock synchronization, while the 8‑lead version omits these features. Pin functions, package dimensions, and recommended layout are detailed for PCB designers.
| Input Supply Voltage Range | 3 V to 8 V |
|---|---|
| Maximum Duty Cycle | >91 % |
| Shutdown Current | <10 µA |
| Efficiency | >95 % |
| Output Regulation | +1 % over line, load and temperature |
The device operates with an input supply voltage from 3 V to 8 V.
The maximum duty cycle is greater than 91 % over temperature.
In shutdown mode the supply current drops to less than 10 µA.
Yes, the LTC3830‑1 version provides an internal soft‑start function.