Overview

The flexible step-down switching regulator controller is a switching regulator controller designed with a high-withstand-voltage built-in POWER MOS FET, providing a free setting function of operating frequency with external resistor. This switching regulator controller features a wide input voltage range (7 V to 35 V or 7 V to 48 V) and operating temperature range (-40˚C to +125˚C or

-40˚C to +95˚C). Furthermore, an external synchronization input pin (BD9781HFP) enables synchronous operation with external clock.

Features

1) Minimal external components

2) Wide input voltage range: 7 V to 35 V (BD9778F/HFP and BD9781HFP), 7 V to 48 V (BD9001F)

3) Built-in P-ch POWER MOS FET

4) Output voltage setting enabled with external resistor: 1 to VIN

5) Reference voltage accuracy: ±2%

6) Wide operating temperature range: -40˚C to +125˚C (BD9778F/HFP and BD9781HFP),

                                                  -40˚C to +95˚C (BD9001F)

8) Low dropout: 100% ON Duty cycle

9) Standby mode supply current: 0 µA (Typ.) (BD9778F/HFP and BD9781HFP), 4 µA (Typ.) (BD9001F)

10) Oscillation frequency variable with external resistor: 50 to 300 kHz (BD9001F), 50 to 500 kHz (BD9778F/HFP and BD9781HFP)

11)External synchronization enabled (only on the BD9781HFP)

12)Soft start function : soft start time fixed to 5 ms (Typ.))

13)Built-in overcurrent protection circuit

14)Built-in thermal shutdown protection circuit

15)High power HRP7 package mounted (BD9778HFP and BD9781HFP)

         Compact SOP8 package mounted (BD9778F and BD9001F)