TECHNICAL NOTE Single-chip Type with Built-in FET Switching Regulator Series 2-output High-efficiency Step-down Switching Regulators with Built-in Power MOSFET BD9302FP Description The BD9302FP is a 2-channel step-down switching regulator controller with a 2.5-MHz, 2-A power switch and available for 2.5-MHz high speed switching operation, which facilitates settings of switching frequency with external resistance, supporting for a wide input voltage range of 6 to 18 V. Furthermore, due to a low reference voltage of 0.6 V, this BD9302FP is an L/C best suited to high-voltage input/low-voltage output applications, for example, to step down a voltage from 12 V to 1.2 V. Features 1) A wide input voltage range of 6 V to 18 V 2) Easy switching frequency setting in the range of 200 k to 2.5 MHz. 3) Two built-in power switches of 0.4 , 2 A. 4) 180 phase shift 5) Built-in Under Voltage Lock Out circuit 6) Built-in overcurrent protection circuit 7) Built-in Thermal Shutdown circuit Use Power supply for DPS requiring two power sources ADSL modem/plasma display Audio devices Dec. 2008Absolute maximum ratings (Ta=25C) Item Symbol Rating Unit Power supply voltage Vcc 20 V Power dissipation Pd 1450* mW Operating temperature Topr -40 ~ +85 C Storage temperature Tstg -55 ~ +150 C Output current Io 2** A Maximum junction temperature Tjmax 150 C * Should be derated by 11.6 mW/C at Ta=25C or more. When mounted on a glass epoxy PCB of 70701.6 mm) ** Should not exceed Pd-value. Recommended operating range (Ta=25C) Limits Item Symbol Unit Min Typ Max Power supply voltage Vcc 6 12 18 V Output current Io 1.8 A 10 Timing resistance RT 100 k 100 Oscillation frequency Fosc kHz 2500 Electrical characteristics Electrical characteristics (Unless otherwise specified, Ta=25C, Vcc=12 V, RT=10 k) Limits Item Symbol Unit Conditions Min Typ Max Triangular wave oscillator block Oscillation frequency FOSC 1800 2000 kHz RT=10k 2200 Frequency variation FDVO 1 % ~ 18V Overcurrent protection circuit block 2 6 * Overcurrent limit Isw 4 A Under-voltage malfunction prevention circuit block 3.0 3.6 Upper limit threshold voltage VtH 3.3 V 2.7 3.3 Lower limit threshold voltage VtL 3.0 V Soft start circuit block 6 Vss=1V 14 Source current Isso 10 uA 0.6 5 Sink current ISSI 1.7 mA Vss=1V, Vcc=3V 1.75 2.15 Clamp voltage Vcl 1.95 V Shutdown voltage VSDWN 0.3 V Vcc=3V Not designed for radiation resistance. * Design guarantee (No 100% pre-shipment inspections are conducted.) 2/16