HOME > Product Tree > Power Supply ICs > Switching Regulators > S-8355/56/57/58 series

Overview - S-8355/56/57/58 series

Super-Small Package PWM Control, PWM/PFM Control Step-Up Switching Regulator (DC/DC Converter ICs) S-8355/56/57/58 series

The S-8355/56/57/58 Series is a CMOS step-up switching regulator (DC/DC Converter ICs) which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM control circuit (S-8355/57) and a PWM/PFM switching control circuit (S-8356/58). With an external low-ON-resistance Nch Power MOS, this product is applicable to applications requiring high efficiency and high output current.
The S-8355/57 Series realizes low ripple, high efficiency, and excellent transient characteristics with the PWM control circuit whose duty ratio can vary from 0 % to 83 % (from 0 % to 78 % for 250 kHz and 300 kHz models), the best-designed error amplifier and phase compensation circuits.
The S-8356/58 Series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current.

DATA SHEET
2010.7.15

Features


    • Low voltage operation: Start-up is guaranteed from 0.9V(Iout =1mA )
    • Low current consumption: During operation 25.9 µA (3.3V, 100 kHz, typ.), During shutdown 0.5 µA (max.)
    • Duty ratio: Built-in PWM/PFM switching control circuit (S-8356/58)
      15 to 83% (100 kHz models), 15 to 78% (250 kHz and 300 kHz models)
    • External parts: coil, diode, capacitor, and transistor
    • Output voltage: 0.1V step setting is available between 1.5 and 6.5V (for Vdd/Vout separate types) or 2.0 and 6.5V (for other than Vdd/Vout separate types).
    • Accuracy of ±2.4%.
    • Oscillation frequency: 100, 250, 300 and 600 kHz
    • Soft start function: 6ms (100 kHz, typ.)
    • Shutdown function
    • Packages: SOT-23-3, SOT-23-5, SOT-89-3, 6-Pin SNB(B)
    • Lead-free products

Applications


    • Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs
    • Power supplies for audio equipment such as portable CD/MD players
    • Constant voltage power supplies for cameras, video equipment, and communications equipment
    • Power supplies for microcomputers

Standard Circuit