Automotive, 125°C Operation, 18 V Input, 1 A, Low EMI, Synchronous Step-down Switching Regulator S-19944A/19944B/19945A/19945B Series

HTMSOP-8 (FP008-A) HSNT-8(2030) (PP008-A)

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 V_OUT 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.

Features

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

±1.5%

Efficiency

91%

Oscillation frequency

2.2 MHz typ.

Spread spectrum clock generation function

F_SSS = +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.

Applications

• 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