S-19902C/19902D/19903C/19903D Series AUTOMOTIVE, 125C OPERATION, 36 V INPUT, 600 mA SYNCHRONOUS www.ablic.com STEP-DOWN SWITCHING REGULATOR ABLIC Inc., 2019-2021 Rev.2.4 00 The S-19902/19903 Series is a step-down switching regulator developed using high withstand voltage CMOS process technologies. This IC has high maximum operation voltage of 36 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-19902 Series) or PWM / PFM switching control (S-19903 Series) can be selected as an option. Since the S-19903 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-19902/19903 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. ABLIC Inc. offers FIT rate calculated based on actual customer usage conditions in order to support customer functional safety design. For more information regarding our FIT rate calculation, contact our sales representatives. Caution This product can be used in vehicle equipment and in-vehicle equipment. Before using the product for these purposes, it is imperative to contact our sales representatives. Features Applications Input voltage: 4.0 V to 36.0 V For automotive use (engine, transmission, Output voltage (externally set): 2.5 V to 12.0 V suspension, ABS, related-devices for EV / Output current: 600 mA HEV / PHEV, etc.) FB pin voltage accuracy: 1.5% Constant-voltage power supply for Efficiency: 95% electrical application for vehicle interior Oscillation frequency: 400 kHz typ. Constant-voltage power supply Overcurrent protection function: 1.2 A typ. (pulse-by-pulse method) for industrial equipment Thermal shutdown function: 170C typ. (detection temperature) Constant-voltage power supply Short-circuit protection function: Hiccup control, Latch control for home electric appliance 100% duty cycle operation: Packages Soft-start function: 5.8 ms typ. Under voltage lockout function (UVLO): 3.35 V typ. (detection voltage) HTMSOP-8 Input and output capacitors: Ceramic capacitor compatible (4.0 mm 2.9 mm t0.8 mm max.) Operation temperature range: Ta = 40C to +125C HSNT-8(2030) Lead-free (Sn 100%), halogen-free (3.0 mm 2.0 mm t0.5 mm max.) Withstand 45 V load dump HSNT-6(2025) *1 AEC-Q100 qualified (2.46 mm 1.96 mm t0.5 mm max.) *1. Contact our sales representatives for details. Typical Application Circuit Efficiency VIN VIN L V = 12.0 V, V = 3.3 V IN OUT VOUT 33 H 100 3.3 V S-19903 Series VEN EN SW 80 CFB RFB1 CIN 60 4.7 F 100 pF 312.5 k FB 40 CREG COUT VSS 1 F 47 F S-19902 Series 20 RFB2 100 k 0 0.1 1 10 100 1000 IOUT mA 1 % AUTOMOTIVE, 125C OPERATION, 36 V INPUT, 600 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR S-19902C/19902D/19903C/19903D Series Rev.2.4 00 Block Diagrams 1. S-19902 Series (PWM control) VIN *1 *1 EN VREG Enable VIN CIN Regulator circuit *1 *1 UVLO circuit CREG *1 Soft-start VREG circuit SW VOUT *1 + FB Error L amplifier CFB RFB1 PWM *1 COUT *1 control + circuit RFB2 Oscillation circuit VREF Short-circuit protection circuit VSS *1. Parasitic diode Figure 1 2. S-19903 Series (PWM / PFM switching control) VIN *1 *1 EN VREG Enable VIN CIN Regulator circuit *1 *1 UVLO circuit CREG *1 Soft-start VREG circuit SW VOUT *1 FB + Error L CFB RFB1 amplifier COUT *1 *1 switching + RFB2 Oscillation circuit VREF Reverse current detection Short-circuit circuit protection circuit VSS *1. Parasitic diode Figure 2 2