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	Excellence in Electronics

ROHM Co. Ltd. is based in Kyoto, Japan manufacturing company. Established in 1958, ROHM designs and manufactures integrated circuits (ICs), discrete semiconductors, optoelectronics, passive components and other electronic components for through hole and SMD assembly. All these components find a home in the dynamic and ever-growing electronics market. Some of the most innovative equipment and devices in the world use ROHM products. Ranked as one of the leading global manufacturers of semiconductors, ROHM is offering wide range of products, covering most types of electronic components. The manufacturing facilities of the company are concentrated in Japan and Far East. The quality of Rohm products is proven by a number of quality certificates.

PRODUCTS LINKS

Power Modules and ICs	Integrated Circuit Protectors - ICP-N
Motor Driver	Optoelectronic devices
Serial EEPROM memories	Discrete semiconductors
Analog integrated circuits

NEW! NEW! NEW!

High Quality Switching Regulators

Rohm high efficient switching mode regulator series, with high output current and working frequency up to 500 kHz is suitable for powering big electronic modules like printers, scanners or GSM modules. Recommended for powering Cinterion GSM modules

ROHM's switching regulators are suitable for powering Cinterion GSM modules!

You can download datasheet by clicking on the name placed in "Order Code" column of every table.

Download design application note here

Order code	BD9778HFP	BD9778F	BD9781HFP	BD9001F	Unit
Maximum output current	2	2	4	2	A
Maximum power dissipation	5.5	0.65	5.5	0.69	W
Supply voltage V_IN	5 to 35	5 to 35	5 to 35	7 to 48	V
Output voltage	1 to V_IN	1 toV_IN	1 toV_IN	1 toV_IN	V
Reference voltage precision	±0.5	±0.5	±0.5	±0.5	%
Operating temperature	-40 to+125	-40 to +125	-40 to +125	-40 to +95	ºC
Operating frequency	50 to 500	50 to 500	50 to 500	50 to 500	kHz
Oscillation mode	Self oscillation	Self oscillation	Self oscillation	Self oscillation
Package	HRP7	SOP8	HRP7	SOP8
Availability	ON STOCK	ON STOCK	ON STOCK	ON STOCK
Price

BD9778HFP Flexible switching regulator with high output current

NOW AVAILABLE ON STOCK!!!

ROHM and Comet Electronics offer you high power flexible switching regulator with output current up to 2 A, suitable for powering big electronic modules like printer modules, scanners, GSM modules.

High maximum output current (2A) Wide input voltage range On chip switching P channel MOSFET Adjustable output voltage up to VIN Selectable operating frequency up to 500kHz Wide operating temperature range Over current protected output Built in temperature shut down circuit Enable pin for external mode control High power package HRP7 Soft start function	BD9778HFP
	Parameter	Value	Unit
	Maximum output current	2	A
	Maximum power dissipation	5.5	W
	Supply voltage V_IN	5 to 35	V
	Output voltage	1 to V_IN	V
	Reference voltage precision	±0.5	%
	Operating temperature	-40 to +125	ºC
	Operating frequency	50 to 500	kHz
	Oscillation mode	Self oscillation
	Package	HRP7

See also :

BD9781HFP - Switching regulator with maximum output cuurrent 2 А, package HRP7;

BD9001F - Switching regulator with maximum input voltage 48 V, output cuurrent 2 А, package SO8;

Download design application note here

Application information : BD9778HFP Demo PCB and Application schematic

Download datasheet

PACKAGE DRAWING

Download

BD9778HFP Demo PCB

The BD9778HFP Demo board is capable of working as standard SMPS module, or as Constant Current High Power LED driver. Applications: Powering Sony Ericsson M2M GSM/GPRS radio devices GM/GR47 and GR/GS64. Constant Current High Power LED driver, suitable for CREE XLamp series. Download Application schematic .pdf Download design application note here

Application schematics supported by BD9778HFP Demo PCB

Standard 5V/1A DC/DC step-down converter



Output voltage calculation:		*, V_REF= 1.00 V – internally generated*

Download design application note here

For prices and availability, please click on the name placed in "Order Code" column of every table.

Input and output ripple		Bill of materials
Click to enlarge		Designator	Part	Order code	Note
		U1	BD9778HFP	BD9778HFP ROHM	HRP7
		D1	1N5819	1N5819(SS14) SMD (SMA)	Schottky
		D2	1N5822	1N5822(SS34) SMD (SMC)	Schottky
		L1	Inductor 10 μH	CL10uH DRH125	SMD
		LF1	2x22 mH, 0.8 A	Kaschke 094.916	Line filter
		F1	1.6 A fuse	PFRA.160 SCHURTER	Resettable
		C1	Capacitor 220 μF	CE 220uF 35V Fujicon	Electrolitic
		C3	Capacitor 33 nF	C1206 33nF 50V X7R	Ceramic
		C4	Capacitor 470 nF	C1206 470nF 50V X7R	Ceramic
		C5	Capacitor 470 μF	CE 470uF 16V 105C LOW ESR	LOW ESR
		C8, C10	Capacitor 100 nF	C1206 100nF 50V X7R	Ceramic
		C9	Capacitor 6.8 nF	C1206 6.8nF 50V X7R	Ceramic
		R1	Resistor 10kΩ 5%	R1206 10K 5%
		R2	Resistor 15kΩ 1%	R1206 15K 1%	Precise
CH1 – Output, CH2 – Input J1, CH3 – D2 Anode after LF1		R3	Resistor 5.1kΩ 1%	R1206 5.1K 1%	Precise
Output voltage: V_OUT = 4.9 V Input voltage: V_IN= 12 V Output current: I_OUT = 1 A	Operating frequency: f_SW = 440kHz Ambient temperature: T₀ = 25 °C Input current : I_IN = 540 mA	R4	Resistor 56kΩ 1%	R1206 56K 1%	Precise
		R6	Resistor 20kΩ 1%	R1206 20K 1%	Precise
		J1	Terminal block 2 pin	TS-502 2P
		J2	Terminal block 3 pin	TS-502 3P

		PCB	PCB, no components	BD9778HFP Demo PCB

Download Application schematic .pdf

White Power LED driver with dimming



Calculating the forward LED current I_F (no dimming):		*R_CS – Current sense resistor*

For prices and availability, please click on the name placed in "Order Code" column of every table.

Download design application note here

Driving 3 white 1W LEDs XL7090	Bill of materials
(R1 mounted, no dimming) Click to enlarge	Designator	Part	Order code	Note
	U1	BD9778HFP	BD9778HFP ROHM
	D1, D2	1N5819	1N5819(SS14) SMD (SMA)	Schottky
	L1	Inductor 10 μH	CL10uH SD73	SMD
	LF1	2x12 mH, 0.54A	Kaschke 071.921	Line filter
	F1	1.6 A fuse	PFRA.160 SCHURTER	Resettable
	C1	Capacitor 220 μF	CE 220uF 35V Fujicon	Electrolitic
	C3	Capacitor 33 nF	C1206 33nF 50V X7R	Ceramic
	C4	Capacitor 470 nF	C1206 470nF 50V X7R	Ceramic
	C5	Capacitor 220 μF	CE 220uF 25V 105C LOW ESR	LOW ESR
	C8, C10	Capacitor 100 nF	C1206 100nF 50V X7R	Ceramic
	C9	Capacitor 6.8 nF	C1206 6.8nF 50V X7R