ROHM BD4719G, BD4720G, BD4721G, BD4722G, BD4723G Schematic [ru]

Datasheet

Voltage Detector IC Series

Bipolar

Voltage Detector ICs

BD47xx series

●General Description

The BD47xx series is a Voltage Detector IC, developed to prevent system errors at transient state, when the power of CPU or logic circuit switches ON/OFF or in cases of momentary shut down. These ICs consist of three terminals (power supply, GND and reset output) to detect power supply voltages and outputs reset signals of various systems. These ICs are ultra-compact and have low current consumption, making them ideal for portable products.

●Features

High accuracy detection

Low current consumption

Very small package

Open collector “L” reset output

Package SSOP5 is similar to SOT-23-5 (JEDEC)

●Key Specifications
	Detection voltage range:		1.9V to 4.6V (Typ.)
			0.1V steps
 High accuracy detection voltage:			±1%
	Low current consumption:		1.6µA (Typ.)
	Operating temperature range:		-40°C to +75°C
●Package
SSOP5		2.90mm x 2.80mm x 1.25mm

●Applications

Circuits using microcontrollers or logic circuits that require a reset.

●Typical Application Circuit

		VDD		VDD
			RL
	BD47xx series	VOUT	RESET	CPU
				Micro-controller
			CL
		GND		GND

●Connection Diagram

●Pin Descriptions

SSOP5

TOP VIEW

VDD

VOUT

PIN No.

Symbol

Function

1

N.C.

Unconnected Terminal

2

SUB

Substrate*

3

GND

GND

Lot. No

4

VOUT

Reset Output

Marking

5

VDD

Power Supply Voltage

N.C.

SUB GND

*Substrate Pin should be connected with GND

○Product structure Silicon monolithic integrated circuit ○This product is not designed for protection against radioactive rays

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BD47xx series

●Ordering Information
B D 4	7	x	x	G -	T R

Part	Reset Voltage Value	Package
Number	19 : 1.9V	G : SSOP5

0.1V step

46 : 4.6V

(SOT-23-5)

Packaging and forming specification TR : Embossed tape

and reel

●Lineup

	Marking	Detection	Part Number	Marking	Detection	Part Number	Marking	Detection	Part Number
		Voltage			Voltage			Voltage
	B2	4.6V	BD4746	BR	3.6V	BD4736	BH	2.6V	BD4726
	B1	4.5V	BD4745	BQ	3.5V	BD4735	BG	2.5V	BD4725
	BZ	4.4V	BD4744	BP	3.4V	BD4734	BF	2.4V	BD4724
	BY	4.3V	BD4743	B4	3.3V	BD4733	BE	2.3V	BD4723
	BX	4.2V	BD4742	BN	3.2V	BD4732	BD	2.2V	BD4722
	BW	4.1V	BD4741	BM	3.1V	BD4731	BC	2.1V	BD4721
	BV	4.0V	BD4740	BL	3.0V	BD4730	BB	2.0V	BD4720
	BU	3.9V	BD4739	BK	2.9V	BD4729	BA	1.9V	BD4719
	BT	3.8V	BD4738	BJ	2.8V	BD4728
	BS	3.7V	BD4737	B3	2.7V	BD4727

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BD47xx series

●Absolute maximum ratings

Parameter	Symbol	Limit	Unit
Power Supply Voltage	VDD	-0.3 to +10	V
Output Voltage	VOUT	-0.3 to +10	V
Output Current	Io	60	mA
Power Dissipation *1 *2	Pd	540	mW
Operation Temperature Range	Topt	-40 to +75	°C
Ambient Storage Temperature	Tstg	-55 to +125	°C

*1 Reduced by 5.4mW/°C when used over 25°C.

*2 When mounted on ROHM standard circuit board (70mm×70mm×1.6mm, glass epoxy board).

●Electrical characteristics (Unless Otherwise Specified Ta=25°C)

Parameter		Symbol	Condition			Limit		Unit
					Min.	Typ.	Max.
			VDD=HL RL=4.7kΩ		VDET (T)	VDET(T)	VDET(T)
					×0.99		×1.01
			VDET=2.5V	Ta=+25°C	2.475	2.5	2.525
				Ta=-40°C to 75°C	2.418	-	2.584
Detection Voltage		VDET	VDET=3.0V	Ta=+25°C	2.970	3.0	3.030	V
				Ta=-40°C to 75°C	2.901	-	3.100
			VDET=3.3V	Ta=+25°C	3.267	3.3	3.333
				Ta=-40°C to 75°C	3.191	-	3.410
			VDET=4.2V	Ta=+25°C	4.158	4.2	4.242
				Ta=-40°C to 75°C	4.061	-	4.341
Temperature Coefficient		VDET/∆T	RL=4.7kΩTa=-20 to+75°C Designed Guarantee		-	±0.01	-	%/°C
Of Detection Voltage
Detection Hysteresis Voltage		∆VDET	RL=4.7kΩ, VDD=LHL		30	50	100	mV
Transfer Delay Time ”H”		tPLH	CL=100pF RL=4.7kΩ	*1	-	20	50	µs
Transfer Delay Time ”L”		tPHL	CL=100pF RL=4.7kΩ	*2	-	60	120	µs
Reset Output Voltage ”L”		VOL	VDD=VDET(min.)-0.05V, RL=4.7kΩ		-	0.1	0.4	V
Circuit Current ON		Icc1	VDD=VDET(min.)-0.05V, RL=∞		-	1.5	3.0	µA
Circuit Current OFF		Icc2	VDD=VDET(typ.)/0.85V, RL=∞		-	1.6	3.2	µA
Operating Voltage Range		VOPL	RL=4.7kΩ VOL≤0.4V		-	0.65	0.85	V
Output Leak Current		Ileak	VDD=VOUT=10V		-	-	0.1	µA
Reset Output Current ”L”		IOL	Vo=0.4V, VDD=VDET(min.)-0.05V		3.0	15.0	-	mA
VDET(T):Standard Detection		Voltage(1.9V	to 4.6V, 0.1V step

R :Pull-up resistor to be connected between VOUT and power supply. CL:Capacitor to be connected between VOUT and GND.

*1 tPLH:VDD=(VDET(typ.)-0.4V)(VDET(typ.)+0.4V) *2 tPHL:VDD=(VDET(typ.)+0.4V)(VDET(typ.)-0.4V)

Design Guarantee. (Outgoing inspection is not done on all products)

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BD47xx series

●Block Diagram

VDD
	5
	4
	VOUT
Vref
	3
GND
Fig.1	BD47xx series

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BD47xx series

●Typical Performance Curves

	10
C[μA]	9						BD4729G
	8
IC
	7
CURRENT
	6
	5
	4
CIRCUIT	3
	2
	1				Icc1=1.34μA
					Icc2=1.46μA
	0
	0	1	2	3	4	5	6	7	8	9	10
		VDD SUPPLY VOLTAGE VDD[V]

Fig.2 Circuit Current

	6
T[V]				BD4729G
	5
VOU
	4
VOLTAGE
	3
OUTPUT	2	VDET=2.90V			VDET=2.95V
	1				VDET=50mV
	0
	0	1	2	3	4	5	6
		VDD SUPPLY VOLTAGE VDD[V]

Fig.4 I/O Characteristics

[mA]	800
	700				BD4729G
IOL
	600
CURRENT
	500
	400		IOL=12.194mA at Vo=400mV
OUTPUT	300
	200
"LOW"	100
	0
	0	5	10	15	20	25	30
		OUTPUT VOLTAGE VOUT[mV]

Fig.3 “Low” Output Current

	1000
T[mV]	900				BD47299G
	800
VOU	700
VOLTAGE	600
	500
	400
OUTPUT	300		VOPL=0.675V
	200
	100
	0
	0	0.5	1	1.5	2	2.5
		VDD SUPPLY VOLTAGE VDD[V]

Fig.5 Operating Limit Voltage

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