The LT1534/LT1534-1 are a new class of switching regulators designed to reduce conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by providing user control of the output switch slew rates. Voltage and current slew rates can be independently programmed to optimize switcher harmonic content versus efficiency. The LT1534/LT1534-1 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency. The LT1534/LT1534-1 utilize a current mode architecture optimized for low noise boost topologies. The ICs include a 2A power switch along with all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics. Protection features include cycle-by-cycle current limit protection, undervoltage lockout and thermal shutdown. Low minimum supply voltage and low supply current during shutdown make the LT1534/LT1534-1 well suited for portable applications. The LT1534/LT1534-1 are available in the 16-pin narrow SO package.
The LT1534/LT1534-1 are ultralow‑noise 2 A current‑limited switching regulators designed to reduce conducted and radiated EMI. They feature independent control of switch voltage and current slew rates, a wide 2.7 V‑23 V input range, and synchronization to an external clock. The devices include an internal oscillator, error‑amp circuitry, and protection functions such as cycle‑by‑cycle current limit, under‑voltage lockout, and thermal shutdown.
The datasheet provides pin‑function descriptions, typical application circuits, electrical characteristics, performance graphs, and package dimensions for the 16‑lead plastic SO package. It also lists related Linear Technology parts and references application notes for EMI reduction techniques.
| Input Voltage Range | 2.7 V to 23 V |
|---|---|
| Maximum Switch Current | 2 A |
| Oscillator Frequency | 20 kHz to 250 kHz |
| Package Type | 16‑lead plastic SO |
| Storage Temperature Range | -65 °C to 150 °C |
The recommended operating input voltage range is 2.7 V to 23 V.
By connecting the SYNC pin (Pin 4) to the external clock source; the pin may also be left floating or tied to ground if not used.