The LT1533 is a new class of switching regulator designed to reduce conducted and radiated electromagnetic interference (EMI). It features ultralow noise and EMI, high efficiency, and independent control of switch voltage and current slew rates.
The LT1533 is a new class of ultralow‑noise switching regulator that provides independent control of output switch voltage and current slew rates, reducing conducted and radiated EMI. It features two 1 A current‑limited power switches, a wide 2.7 V‑23 V input range, and a low 12 µA shutdown current, making it suitable for portable and noise‑sensitive applications. The device includes built‑in oscillator, protection circuitry, and can be synchronized to an external clock.
Typical applications include precision instrumentation, isolated supplies for industrial automation, medical instruments, wireless communications, and single‑board data acquisition systems. The datasheet details pin functions, absolute maximum ratings, electrical characteristics, package dimensions, and operation modes such as 50 % duty‑cycle mode via the DUTY pin.
| Input Voltage Range | 2.7 V to 23 V |
|---|---|
| Output Switch Current | 1 A |
| Shutdown Current (typical) | 12 µA |
| Oscillator Frequency Range | 20 kHz to 250 kHz |
| Package Type | 16‑lead narrow SO (SOT‑223) |
The typical shutdown current is 12 µA.
Ground the DUTY pin to force the outputs to switch with a 50 % duty cycle.
It operates with an input voltage from 2.7 V up to 23 V.