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. ●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. ●Features High accuracy detection Low current consumption Very small package Open collector “L” reset output Package SSOP5 is similar to SOT-23-5 (JEDEC) ●Typical Application Circuit VDD VDD RL BD47xx series CPU Micro-controller RESET VOUT CL GND ●Connection Diagram SSOP5 TOP VIEW VDD ●Pin Descriptions VOUT Lot. No Marking N.C. GND SUB GND PIN No. Symbol Function 1 N.C. Unconnected Terminal 2 SUB Substrate* 3 GND GND 4 VOUT Reset Output 5 VDD Power Supply Voltage *Substrate Pin should be connected with GND ○Product structure：Silicon monolithic integrated circuit ○This product is not designed for protection against radioactive rays .www.rohm.com TSZ02201-0R7R0G300020-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 1/10 TSZ22111・14・001 22.May.2013 Rev.006 Datasheet BD47xx series ●Ordering Information B D 4 7 x Part Number x G - Reset Voltage Value Package 19 : 1.9V G : SSOP5 0.1V step 46 : 4.6V T R Packaging and forming specification TR : Embossed tape and reel SSOP5 (SOT-23-5) 5 4 2 1 3 Tape Embossed carrier tape Quantity 3000pcs Direction of feed 0.2Min. +0.2 1.6 −0.1 2.8±0.2 <Tape and Reel information> +6° 4° −4° 2.9±0.2 TR The direction is the 1pin of product is at the upper right when you hold ( reel on the left hand and you pull out the tape on the right hand 1pin +0.05 0.13 −0.03 1.25Max. ) 0.05±0.05 1.1±0.05 S +0.05 0.42 −0.04 0.95 0.1 S Direction of feed Reel (Unit : mm) ∗ Order quantity needs to be multiple of the minimum quantity. ●Lineup Marking B2 B1 BZ BY BX BW BV BU BT BS Detection Voltage 4.6V 4.5V 4.4V 4.3V 4.2V 4.1V 4.0V 3.9V 3.8V 3.7V Part Number Marking BD4746 BD4745 BD4744 BD4743 BD4742 BD4741 BD4740 BD4739 BD4738 BD4737 BR BQ BP B4 BN BM BL BK BJ B3 www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Detection Voltage 3.6V 3.5V 3.4V 3.3V 3.2V 3.1V 3.0V 2.9V 2.8V 2.7V 2/10 Part Number Marking BD4736 BD4735 BD4734 BD4733 BD4732 BD4731 BD4730 BD4729 BD4728 BD4727 BH BG BF BE BD BC BB BA Detection Voltage 2.6V 2.5V 2.4V 2.3V 2.2V 2.1V 2.0V 1.9V Part Number BD4726 BD4725 BD4724 BD4723 BD4722 BD4721 BD4720 BD4719 TSZ02201-0R7R0G300020-1-2 22.May.2013 Rev.006 Datasheet BD47xx series ●Absolute maximum ratings Parameter Power Supply Voltage Output Voltage Output Current *1 *2 Power Dissipation Operation Temperature Range Symbol VDD VOUT Limit -0.3 to +10 -0.3 to +10 Unit V V Io Pd Topt 60 540 -40 to +75 mA mW °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 VDD=H L VDET=2.5V Detection Voltage VDET VDET=3.0V VDET=3.3V VDET=4.2V RL=4.7kΩ Ta=+25°C Ta=-40°C to 85°C Ta=85°C to 105°C Ta=+25°C Ta=-40°C to 85°C Ta=85°C to 105°C Ta=+25°C Ta=-40°C to 85°C Ta=85°C to 105°C Ta=+25°C Ta=-40°C to 85°C Ta=85°C to 105°C Temperature Coefficient VDET/∆T RL=4.7kΩTa=-20 to+75°C Designed Guarantee Of Detection Voltage Detection Hysteresis Voltage ∆VDET RL=4.7kΩ, VDD=L H L *1 Transfer Delay Time ”H” tPLH CL=100pF，RL=4.7kΩ *2 Transfer Delay Time ”L” tPHL CL=100pF，RL=4.7kΩ Reset Output Voltage ”L” VOL VDD=VDET(min.)-0.05V, RL=4.7kΩ Circuit Current ON Icc1 VDD=VDET(min.)-0.05V, RL=∞ Circuit Current OFF Icc2 VDD=VDET(typ.)/0.85V, RL=∞ Operating Voltage Range VOPL RL=4.7kΩ，VOL≤0.4V Output Leak Current Ileak VDD=VOUT=10V Reset Output Current ”L” IOL Vo=0.4V, VDD=VDET(min.)-0.05V VDET(T):Standard Detection Voltage(1.9V to 4.6V, 0.1V step） RＬ: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) www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/10 Limit Min. Typ. VDET (T) VDET(T) ×0.99 2.475 2.5 2.418 2.404 2.970 3.0 2.901 2.885 3.267 3.3 3.191 3.173 4.158 4.2 4.061 4.039 - Max. VDET(T) ×1.01 2.525 2.584 2.597 3.030 3.100 3.117 3.333 3.410 3.428 4.242 4.341 4.364 Unit V - ±0.01 - %/°C 30 3.0 50 20 60 0.1 1.5 1.6 0.65 15.0 100 50 120 0.4 3.0 3.2 0.85 0.1 - mV µs µs V µA µA V µA mA TSZ02201-0R7R0G300020-1-2 22.May.2013 Rev.006 Datasheet BD47xx series ●Block Diagram VDD 5 4 VOUT Vref 3 GND Fig.1 BD47xx series www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 4/10 TSZ02201-0R7R0G300020-1-2 22.May.2013 Rev.006 Datasheet BD47xx series ●Typical Performance Curves "LOW" OUTPUT CURRENT ： IOL [mA] CIRCUIT CURRENT ： ICC [µA] 10 【BD4729 】】 【BD4729G 9 8 7 6 5 4 3 2 Icc1=1.34µA Icc2=1.46µA 1 0 0 1 2 3 4 5 6 7 8 800 600 500 400 IOL=12.194mA at Vo=400mV 300 200 100 0 9 10 0 VDD SUPPLY VOLTAGE ：VDD [V] 5 10 15 20 25 30 OUTPUT VOLTAGE ： VOUT[mV] Fig.2 Circuit Current Fig.3 “Low” Output Current 1000 OUTPUT VOLTAGE ： VOUT[mV] 6 OUTPUT VOLTAGE ： VOUT[V] BD4729G 【【 BD4729 】】 700 BD4729G 【【BD4729 】】 5 4 3 2 VDET=2.90V VDET=2.95V 1 ⊿VDET=50mV 0 0 1 2 3 4 5 BD4729G 【【BD4729 】】 900 800 700 600 500 400 VOPL=0.675V 300 200 100 0 6 0 0.5 1 1.5 2 2.5 VDD SUPPLY VOLTAGE ：VDD [V] VDD SUPPLY VOLTAGE ： VDD [V] Fig.4 I/O Characteristics www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Fig.5 Operating Limit Voltage 5/10 TSZ02201-0R7R0G300020-1-2 22.May.2013 Rev.006 Datasheet BD47xx series ●Typical Performance Curves – continued CIRCUIT CURRENT WHEN ON ： ICC1[mA] DETECTION VOLTAGE ： VDET[V] 3.5 BD4729G】 【 【BD4729】 3.3 3.1 -0.007%/℃ 2.9 2.7 2.5 ~ ~ 【BD4729】 【BD4729G】 2.0 1.5 1.0 0.5 0.0 -20 -10 0 10 20 30 40 50 60 70 80 TEMPERATURE ： Ta[℃] TEMPERATURE ： Ta[℃] Fig.6 Detection Voltage Fig.7 Circuit Current when ON 2.5 0.9 MINIMUM OPERATION VOLTAGE ： VOPL[V] CIRCUIT CURRENT WHEN OFF ： I CC2[mA] 2.3 -20 -10 0 10 20 30 40 50 60 70 80 2.5 【BD4729】 【BD4729G】 2.0 1.5 1.0 0.5 0.0 -20 -10 0 10 20 30 40 50 60 70 80 【BD4729】 【BD4729G】 0.8 0.7 0.6 0.5 0.4 -20 -10 0 10 20 30 40 50 60 70 80 TEMPERATURE ： Ta[℃] TEMPERATURE ： Ta[℃] Fig.8 Circuit Current when OFF Fig.9 Operating Limit Voltage www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 6/10 TSZ02201-0R7R0G300020-1-2 22.May.2013 Rev.006 Datasheet BD47xx series ●Typical Performance Curves – continued OUTPUT VOLTAGE： VOUT [mV] 500 【BD4729】 BD4729G】 【 400 300 Ta=-20℃ 200 100 Ta=75℃ Ta=25℃ 0 0 1 2 3 4 5 "LOW" OUTPUT CURRENT ： IOL[mA] Fig.10 Output Saturation Voltage www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 7/10 TSZ02201-0R7R0G300020-1-2 22.May.2013 Rev.006 Datasheet BD47xx series ●Application Information Explanation of Operation BD47xx series has threshold voltages namely the detection voltage and release voltage. As the voltages applied to the input reach their respective thresholds, the output switches from “High” to “Low” and from “Low” to “High”. The release voltage has a hysteresis that is the value of the detection voltage +50mV (Typ.), preventing chattering in the output. When the input is greater than the release voltage, the output is in a “High” state. When the input decreases from that state, the output switches to “Low” upon reaching the detection voltage. When the input is less than the detection voltage, the output is in a “Low” state. When the input increases from that state, the output switches to “High” upon reaching the release voltage. Additionally, at least 0.85V input voltage is required for the circuit to function as expected. When the input falls below the operating limit voltage, the output becomes unstable. VDD VDD VDET+ΔVDET VDET ⑤ VOPL 0V VOUT VOH tPHL tPLH tPLH tPHL VOL ① ② ③ ④ Fig.11 Timing Waveform 1 When the power supply is turned on, the output is still unstable until it reaches the operating limit voltage (VOPL) with a given time tPHL. Therefore it is possible that the reset signal is not outputted when the rise time of VDD is faster than tPHL. 2 When VDD is greater than VOPL but less than the reset release voltage (VDET+∆VDET), the output voltages will switch to Low. 3 If VDD exceeds the reset release voltage (VDET+∆VDET) then VOUT switches from L to H. 4 If VDD drops below the detection voltage (VDET) when the power supply is powered down or when there is a power supply fluctuation, VOUT switches to L (with a delay of tPHL). 5 The potential difference between the detection voltage and the release voltage is known as the Hysteresis Width (∆VDET). The system is designed such that, the output does not toggle with power supply fluctuations within this hysteresis width, malfunctions due to noise are prevented. <Precautions> Please be aware that when there is resistance on the power supply line, the detection voltage varies with voltage drops caused by the IC current consumption. Please connect a capacitor between VDD and GND when the power supply line has high impedance. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 8/10 TSZ02201-0R7R0G300020-1-2 22.May.2013 Rev.006 Datasheet BD47xx series ●Circuit Applications The following is an example of an application circuit using Reset IC for normal power supply detection. BD47xx series requires a pull up resistor on the output terminal. The pull up resistor value should be decided depending on the application, with enough consideration of power supply level and output current capability. When a capacitor is placed at the output terminal, to delay the output time or to remove noise, the output will become slower during starting or stopping. Please be careful in considering the appropriate value for pull up resistors, output current, and capacitor when inserting a bypass capacitor between input and GND. Please be aware that if an extremely large capacitor is used, the response time will become excessively slow. ●●●●●●●●●●●● VDD 5 microcontroller 4 ●●●●●●●●●●● VDD Reset Pin VOUT ●●●●●●●●●●●● Vref 3 BD47xx series GND Fig.12 Circuit Applications www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 9/10 TSZ02201-0R7R0G300020-1-2 22.May.2013 Rev.006 Datasheet BD47xx series ●Operational Notes 1) Absolute maximum ratings Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings. 2) Ground Voltage The voltage of the ground pin must be the lowest voltage of all pins of the IC at all operating conditions. Ensure that no pins are at a voltage below the ground pin at any time, even during transient condition. 3) Recommended operating conditions These conditions represent a range within which the expected characteristics of the IC can be approximately obtained. The electrical characteristics are guaranteed under the conditions of each parameter. 4) Bypass Capacitor for Noise Rejection To help reject noise, put a 1µF capacitor between VDD pin and GND and 1000pF capacitor between VOUT pin and GND. Be careful when using extremely big capacitor as transient response will be affected. 5) Short between pins and mounting errors Be careful when mounting the IC on printed circuit boards. The IC may be damaged if it is mounted in a wrong orientation or if pins are shorted together. Short circuit may be caused by conductive particles caught between the pins. 6) Operation under strong electromagnetic field Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction. 7) The VDD line impedance might cause oscillation because of the detection current. 8) A VDD to GND capacitor (as close connection as possible) should be used in high VDD line impedance condition. 9) Lower than the mininum input voltage puts condition. the VOUT in high impedance state, and it must be VDD in pull up (VDD) 10) External parameters The recommended parameter range for RL is 2kΩ to 1MΩ. There are many factors (board layout, etc) that can affect characteristics. Please verify and confirm using practical applications. 11) Power on reset operation Please note that the power on reset output varies with the VDD rise time. Please verify the behavior in the actual operation. 12) Testing on application boards When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply should always be turned off completely before connecting or removing it from the test setup during the inspection process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during transport and storage. 13) Rush current When power is first supplied to the IC, rush current may flow instantaneously. It is possible that the charge current to the parasitic capacitance of internal photo diode or the internal logic may be unstable. Therefore, give special consideration to power coupling capacitance, power wiring, width of GND wiring, and routing of connections. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. 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