Output current: 600 mA product | 1 A product
The S-19944/19945 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%. It has a built-in spread spectrum clock generation circuit capable of reducing conductive noise and emission noise during PWM operation.
As suitable packages for high-density mounting, such as small-sized HSNT-8(2030), are adopted, this IC contributes to miniaturization of electronic equipment.
PWM control (S-19944 Series) or PWM / PFM switching control (S-19945 Series) can be selected as an option.
Since the S-19945 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-19944/19945 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.
- Input voltage
- 4.0 V to 18.0 V
- Output voltage (externally set)
- 1.0 V to 12.0 V
- Output current
- 1 A
- FB pin voltage accuracy
- Oscillation frequency
- 2.2 MHz typ.
- Spread spectrum clock generation function
- FSSS = +6% typ. (Diffusion rate)
- Overcurrent protection function
- 1.85 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 +125°C
- Lead-free (Sn 100%), halogen-free
- AEC-Q100 qualified*1
*1. Contact our sales representatives for details.
- Camera module
- For automotive use (engine, transmission, suspension, ABS, related-devices for EV / HEV / PHEV, etc.)
- Constant-voltage power supply for electrical application for vehicle interior
- Constant-voltage power supply for industrial equipment
- Constant-voltage power supply for home electric appliance