(S-8540 / S-8541) 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.3.2_00 www.DataSheet4U.com
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8...
Rev.3.2_00 www.DataSheet4U.com
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING
REGULATOR CONTROLLER
S-8540/8541 Series
The S-8540/8541 Series is a family of CMOS stepdown switching
regulator controllers with PWM control (S-8540 Series) and PWM/PFM switchover control (S8541 Series). These devices consist of a reference voltage source, oscillation circuit, an error amplifier, phase compensation circuit, PWM control circuit, current limit circuit. A high efficiency and large current switching
regulator is realized with the help of small external components due to the high oscillation frequency, 300 kHz and 600 kHz. The S-8540 Series provides low-ripple voltage, high efficiency, and excellent transient characteristics which come from the PMW control circuit capable of varying the duty ratio linearly from 0 to 100%, the optimized error amplifier, and the phase compensation circuit. The S-8541 Series operates under PWM control when the duty ratio is 29% or higher and operates under PFM control when the duty ratio is less than 29% to ensure high efficiency over all load range. These controllers serve as ideal main power supply units for portable devices due to the high oscillation frequencies together with the small 8-Pin MSOP package.
Features
Oscillation frequency Output voltage Output voltage precision Feed back type for output voltage (FB) External components: Built-in PWM/PFM switchover control circuit (S-8541 series) Current limit circuit S...