The ST763A series is a 3.3V step-down current mode PWM DC-DC converter. It operates from 3.3V to 11V, providing a fixed 3.3V output voltage and delivering up to 500mA. Its main features are a typical efficiency of 90%, a quiescent current of 0.6mA, and only 0.2µA in shut-down. The PWM current mode control provides precise output regulation and very good transient response. Output voltage accuracy is guaranteed to be ±5% over line, load and temperature variations. A minimum number of external components is used and the fixed frequency switching allows easy filtering of output ripple and noise. Other features of this device are cycle-by-cycle current limiting, overcurrent limiting, under voltage lockout and programmable soft-start protection. A 22µH inductor works in most applications, so no sophisticated design is necessary. Package available is SO-8. Typical applications are in 5V to 3.3V converters, cellular phones, portable instruments, hand-held computers, and peripherals.
The ST763A is a step-down switching regulator designed to operate from a supply voltage range of 3.3V to 11V, delivering a fixed 3.3V output voltage. It is capable of providing up to 500mA of guaranteed output current with a typical efficiency of 90% and a typical operation frequency of 200kHz. The device utilizes PWM current mode control to ensure precise output regulation and good transient response, while requiring only a minimum number of external components.
| Output voltage | 3.3V |
|---|---|
| Supply voltage range | 3.3V to 11V |
| Guaranteed output current | 500mA |
| Typical operation frequency | 200KHz |
| Typical efficiency | 90% |
| Operating temperature range | -40°C to 85°C |
| Package type | SO-8 |
The typical quiescent current in ON mode is 0.6mA.
The shutdown current is typically 0.2µA.
The output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations.