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BD4728G-TR

hot BD4728G-TR

BD4728G-TR

For Reference Only

Part Number BD4728G-TR
Manufacturer Rohm Semiconductor
Description IC RESET CPU BIPOLAR 2.8V 5SSOP
Datasheet BD4728G-TR Datasheet
Package SC-74A, SOT-753
In Stock 156962 piece(s)
Unit Price $ 0.2279 *
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BD4728G-TR

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BD4728G-TR Specifications

ManufacturerRohm Semiconductor
CategoryIntegrated Circuits (ICs) - PMIC - Supervisors
Datasheet BD4728G-TR Datasheet
PackageSC-74A, SOT-753
SeriesBD47xx
TypeSimple Reset/Power-On Reset
Number of Voltages Monitored1
OutputOpen Drain or Open Collector
ResetActive Low
Voltage - Threshold2.8V
Operating Temperature-40°C ~ 75°C (TA)
Mounting TypeSurface Mount
Package / CaseSC-74A, SOT-753
Supplier Device Package5-SSOP

BD4728G-TR Datasheet

Page 1

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○Product structure:Silicon monolithic integrated circuit ○This product is not designed for protection against radioactive rays . 1/10 TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 TSZ22111・14・001 www.rohm.com 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 ●Connection Diagram SSOP5 TOP VIEW ●Pin Descriptions 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 GND BD47xx series RESET GND VOUT VDD VDD CPU Micro-controller CL RL N.C. SUB GND VOUT VDD Lot. No Marking Datasheet

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2/10 BD47xx series TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 www.rohm.com TSZ22111・15・001 ●Ordering Information ●Lineup Marking Detection Voltage Part Number Marking Detection Voltage Part Number Marking Detection Voltage Part Number 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 (SOT-23-5) B D 4 7 x x G - T R Part Reset Voltage Value Package Packaging and Number 19 : 1.9V G : SSOP5 forming specification 0.1V step TR : Embossed tape 46 : 4.6V and reel

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3/10 BD47xx series TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 www.rohm.com TSZ22111・15・001 ●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. Detection Voltage VDET VDD=HL RL=4.7kΩ VDET (T) ×0.99 VDET(T) VDET(T) ×1.01 V VDET=2.5V Ta=+25°C 2.475 2.5 2.525 Ta=-40°C to 75°C 2.418 - 2.584 VDET=3.0V Ta=+25°C 2.970 3.0 3.030 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 Of Detection Voltage VDET/∆T RL=4.7kΩTa=-20 to+75°C Designed Guarantee - ±0.01 - %/°C 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) 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)

Page 5

4/10 BD47xx series TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 www.rohm.com TSZ22111・15・001 ●Block Diagram Fig.1 BD47xx series Vref V OUT V DD GND 5 4 3

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5/10 BD47xx series TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 www.rohm.com TSZ22111・15・001 ●Typical Performance Curves Fig.2 Circuit Current 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 VDD SUPPLY VOLTAGE :VDD[V] C IR C U IT C U R R E N T : I C C [μ A ] 【BD4729G】 Icc1=1.34μA Icc2=1.46μA 0 100 200 300 400 500 600 700 800 0 5 10 15 20 25 30 OUTPUT VOLTAGE : VOUT[mV] "L O W " O U T P U T C U R R E N T : I O L [m A ] 【BD4729G】 IOL=12.194mA at Vo=400mV Fig.3 “Low” Output Current Fig.4 I/O Characteristics 0 1 2 3 4 5 6 0 1 2 3 4 5 6 VDD SUPPLY VOLTAGE :VDD[V] O U T P U T V O L T A G E : V O U T [V ] 【BD4729G】 VDET=2.95V ⊿VDET=50mV VDET=2.90V 0 100 200 300 400 500 600 700 800 900 1000 0 0.5 1 1.5 2 2.5 VDD SUPPLY VOLTAGE : VDD[V] O U T P U T V O L T A G E : V O U T [m V ] 【BD4729G】 VOPL=0.675V Fig.5 Operating Limit Voltage 【BD47 】 【 9】 【BD4729】 【BD47 】

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6/10 BD47xx series TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 www.rohm.com TSZ22111・15・001 ●Typical Performance Curves – continued Fig.7 Circuit Current when ON 0.0 0.5 1.0 1.5 2.0 2.5 -20 -10 0 10 20 30 40 50 60 70 80 TEMPERATURE : Ta[℃] C IR C U IT C U R R E N T W H E N O N : I C C 1 [m A ] 【BD4729G】 Fig.8 Circuit Current when OFF 0.0 0.5 1.0 1.5 2.0 2.5 -20 -10 0 10 20 30 40 50 60 70 80 TEMPERATURE : Ta[℃] C IR C U IT C U R R E N T W H E N O F F : I C C 2 [m A ] 【BD4729G】 Fig.9 Operating Limit Voltage 0.4 0.5 0.6 0.7 0.8 0.9 -20 -10 0 10 20 30 40 50 60 70 80 TEMPERATURE : Ta[℃] M IN IM U M O P E R A T IO N V O L T A G E : V O P L [V ] 【BD4729G】 Fig.6 Detection Voltage 2.3 2.5 2.7 2.9 3.1 3.3 3.5 -20 -10 0 10 20 30 40 50 60 70 80 TEMPERATURE : Ta[℃] D E T E C T IO N V O L T A G E : V D E T [V ] 【BD4729G】 -0.007%/℃ ~ ~ 】 】 】 D4729

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7/10 BD47xx series TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 www.rohm.com TSZ22111・15・001 ●Typical Performance Curves – continued 0 100 200 300 400 500 0 1 2 3 4 5 "LOW" OUTPUT CURRENT : IOL[mA] O U T P U T V O L T A G E : V O U T [m V ] 【BD4729G】 Ta=25℃ Ta=75℃ Ta=-20℃ Fig.10 Output Saturation Voltage D4729

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8/10 BD47xx series TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 www.rohm.com TSZ22111・15・001 ●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. 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+ΔVDET), the output voltages will switch to Low. 3 If VDD exceeds the reset release voltage (VDET+ΔVDET) then VOUT switches from L to H after tPLH. 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 (ΔVDET). 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. 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. Fig.11 Timing Waveform VDD VDET+ΔVDET VDET VOPL 0V tPHL ① ② VOUT tPLH tPHL tPLH ③ ④ VOL VOH VDD ⑤

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9/10 BD47xx series TSZ02201-0R7R0G300020-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 21.Jun.2016 Rev.007 www.rohm.com TSZ22111・15・001 ●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. Fig.12 Circuit Applications Vref VOUT VDD GND 5 4 3 BD47xx series VDD Reset Pin microcontroller ●●●●●●●●●●●● ●●●●●●●●●●●● ● ● ● ● ● ● ● ● ● ● ● ●

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