BD9778F

Manufacturer Part NumberBD9778F
ManufacturerRohm
BD9778F datasheet
 


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TECHNICAL NOTE
Single-chip built-in FET type Switching Regulator Series
Flexible Step-down
Switching Regulator
BD9778F/HFP, BD9001F, BD9781HFP
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 V
5)
Reference voltage accuracy: ±2%
6)
Wide operating temperature range: -40˚C to +125˚C (BD9778F/HFP and BD9781HFP),
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)
Applications
All fields of industrial equipment, such as Flat TV , printer, DVD, car audio, car navigation,
and communication such as ETC, AV, and OA.
Product lineup
Item
Output current
Input range
Oscillation frequency range
External synchronization
Standby function
Operating temperature
Package
IN
-40˚C to +95˚C (BD9001F)
BD9778F/HFP
BD9001F
2A
2A
7V ~ 35V
7V ~ 48V
50 ~ 500kHz
50 ~ 300kHz
Not provided
Not provided
Provided
Provided
-40˚C ~ +125˚C
-40˚C ~ +95˚C
SOP8 / HRP7
SOP8
BD9781HFP
4A
7V ~ 35V
50 ~ 500kHz
Provided
Provided
-40˚C ~ +125˚C
HRP7
Apr. 2008

BD9778F Summary of contents