Ablic S-8591AB

Description

The S-8590/8591 Series is a step-down switching regulator developed using high withstand voltage CMOS process technologies. This IC has high maximum operation voltage of 18 V and maintains high-accuracy FB pin voltage at ±1.5%.As suitable packages for high-density mounting, such as small-sized HSNT-6(2025), are adopted, this IC contributes to miniaturization of electronic equipment.PWM control (S-8590 Series) or PWM / PFM switching control (S-8591 Series) can be selected as an option.Since the S-8581 Series, which features PWM / PFM switching control, operates with PWM control under heavy load and automatically switches to PFM control under light load, it achieves high-efficiency operation in accordance with the device's status.Furthermore, our distinctive PWM / PFM switching control technology suppresses the ripple voltage to be generated in VOUT while PFM control is in operation.Since the S-8580/8581 Series has the built-in synchronous circuit, it achieves high efficiency easier compared with conventional step-down switching regulators.In addition, it has the built-in overcurrent protection circuit which protects the IC and coils from excessive load current as well as a thermal shutdown circuit which prevents damage from heat generation.

Features

• Input voltage: 4.0 V to 18.0 V
• Output voltage (externally set): 1.0 V to 12.0 V
• Output current: 600 mA
• FB pin voltage accuracy: ±1.5%
• Efficiency: 91%
• Oscillation frequency: 2.2 MHz typ.
• Overcurrent protection function: 1.2 A typ. (pulse-by-pulse method)
• Thermal shutdown function: 170°C typ. (detection temperature)
• Short-circuit protection function: Hiccup control, Latch control
• 100% duty cycle operation:
• Soft-start function: 5.8 ms typ.
• Under voltage lockout function (UVLO): 3.35 V typ. (detection voltage)
• Input and output capacitors: Ceramic capacitor compatible
• Operation temperature range: Ta = −40°C to +85°C
• Lead-free (Sn 100%), halogen-free

Typical applications

• Constant-voltage power supply for industrial equipment or home electric appliance

More information

• Datasheet
• IC product information