General Description
The TD1509 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 5V,3.3V 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
frequency 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 TD1509 is available in SOP8 and DIP8 packages.
Features
z 5V,3.3V and adjustable output versions
z Output adjustable from 1.23v to 43V
z Fixed 150KHz frequency internal oscillator
z Guaranteed 3A output load current
z Input voltage range up to 45V
z Low power standby mode, IQ typically 80 µA
z TTL shutdown capability
z Excellent line and load regulation
z Requires only 4 external components
z High efficiency
z Thermal shutdown and current limit protection
z Available in SOP8 and DIP8 packages
Applications
z Simple High-efficiency step-down regulator
z On-card switching regulators
z Positive to negative converter
z LCD monitor and LCD TV
z DVD recorder and PDP TV
z Battery charger
z Step-down to 3.3V for microprocessors
