| Description & Applications | STEP-DOWN,PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER •Oscillation frequency 600 kHz (A, B types) 300 kHz (C, D types) • Output voltage 1.5 to 6.0 V, selectable in 0.1V steps (A, C types) • Output voltage precision ±2.0% • Feed back type for output voltage (FB) • External components: a transistor, a coil, a diode, and capacitors • Built-in PWM/PFM switchover control circuit (S-8541 series) Duty ratio: 29% (PFM control) 29 to 100% (PWM control) • Current limit circuit Current is set by an external resistor RSENSE. • Soft-start Time is set by a capacitor CSS and a resistor RSS. • Shutdown function • Power supplies for PDAs, electric organizers, and portable devices. • Power supplies for audio equipment such as portable CD players and headphone stereos. • Main or sub Power supplies for notebook computers and peripheral equipment. |