General description

The EC9309 is a series of easy to use fixed and adjustable step-down (buck) switch-mode voltage regulators.

These devices are available in fixed output voltage of 3.3V, 5V, and an adjustable output version.

Both versions are capable of driving a 2A load with excellent line and load regulation.

Requiring a minimum number of external components, these regulators are simple to use and include internal requency compensation, and a fixed-frequency oscillator.

The output voltage is guaranteed to ±3% tolerance under specified input voltage and output load conditions.

The oscillator frequency is guaranteed to ±15%.

External shutdown is included, featuring typically 80 μA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.

The EC9309 is available in SOP-8 ,and DIP-8 packages.

Features

3V,5V and adjustable output Versions
Output adjustable from 1.23V to 43V
Fixed 150KHz frequency internal oscillator
Guaranteed 2A output load current
Input voltage range up to 45V
Low power standby mode, IQ typically 80 μA
TTL shutdown capability
Excellent line and load regulation
Requires only 4 external components
High efficiency
Thermal shutdown and current limit protection
Available in SOP-8 and DIP-8 packages
Applications
Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
LCD monitor and LCD TV
DVD recorder and PDP TV
Battery charger
Step-down to 3.3V for microprocessors