DESCRIPTION

The family of highly flexible, easy to use PFM controllers is ideal for the use in wide input range switching regulator applications. An advanced PFM control scheme gives these devices the benefits of PWM converters with high efficiency for heavy loads, while us ing very low operating current for light loads to maintain excel lent behaviour with output load variation.

The  switching  circuits  are  suitable  for  topologies  requiring  low side FET, such as boost, flyback, Sepic, etc. Depending on the utilized topology the controllers are capable of producing regulated positive or negative output voltage.

Operating from 3V to 60V supply and in temperature ranges from – 40°C to + 125°C the device is well suited for automotive applications. Requiring a minimum number of external components,

these regulators are simple to use and cost-saving.

FEATURES

Supply voltage range VS 3V to 60V

Up to 90% efficiency

40µA standby current

180µA circuit operating current

1.5V to 24V or more adjustable output voltage

Up to 300kHz switching frequency

Improved current-limited PFM control scheme

High current driver for external MOSFET

Under-voltage lockout and thermal shutdown

– 40°C to + 125°C operating temperature

SO8n package

910.26 basis version

910.24additive with peak current halving for medium loads and extended max. switch-on-time

910.25additive with peak current halving for medium loads and extended max. switch-on-time and fault protection

APPLICATION

Minimum component DC-DC converters

14V, 28V or 42V automotive systems

Power conditioning for portable equipment

High efficiency on-card switching regulators