BL8509B Ultra-small package High-precision Voltage Detector with delay circuit, BL8509B Series General Description Features BL8509B Series is a series of high-precision voltage Highly accuracy： ±2% Low power consumption：TYP 0.9uA (VDD=3V) Detect voltage range：1.0V~6.5V in 0.1V increments signal without external parts. Detect voltage is Operating voltage range：0.7V~7V extremely accurate with minimal temperature drift. Detect voltage temperature characteristics： detectors with a built-in delay time generator of fixed time developed using CMOS process. Internal oscillator and counter timer can delay the release TYP±100ppm/℃ CMOS output configurations are available. Selection Guide Output configuration： CMOS Package： SOT-23，SOT-23-3，SOT-23-5 Typical Application BL8509B- XXX X X XX Power monitor for portable equipment such as notebook computers, digital still cameras, PDA, and cellular phones Package type： RM：SOT-23-3 Constant voltage power monitor for cameras, video RN：SOT-23-5 RO：SOT-23 Output type： equipment and communication devices. Power monitor for microcomputers and reset for N：Nch CPUs. C：CMOS System battery life and charge voltage monitors Delay time： A：50mS B：100mS Typical Application Circuit C：150mS D：200mS E：250mS F：300mS G：400mS Detector voltage： 090……0.9V 100……1.0V 263……2.63V 300……3.0V 465……4.65V …… 600……6.0V Page1 www.belling.com.cn V1.2 BL8509B Pin Configuration Marking definition： Symbol Define XXX Voltage Y Delay Time ZZ Data Code Ex. 293DKL： 293：Detection voltage 2.93v D：Delay time 200ms KL：Date in produced Pin Assignment PIN Number Pin Name Function 1 VSS Ground 2 VOUT Output Voltage 3 VDD Input Voltage Pin Name Function 1 DS ON/OFF switch for delay time 2 VSS Ground 3 NC No Connection 4 VOUT Output Voltage 5 VDD Input Voltage SOT-23/SOT23-3 PIN Number SOT23-5 Block Diagram Page2 www.belling.com.cn V1.2 BL8509B Absolute Maximum Ratings PARAMETER SYMBAL RATINGS UNITS VDD Input Voltage VDD 8 V Output Current IOUT 50 mA VOUT Vss-0.3~ VDD +0.3 V Pd 300 mW Operating Ambient Temperature TOpr -40~+85 ℃ Storage Temperature Tstg -40~+125 ℃ Soldering temperature and time Tsolder 260℃, 10s Output Voltage Continuous Total Power Dissipation CMOS SOT-23-3 SOT-23-5 Electrical Characteristics： ： (-VDET(S)=1.0V to 6.5V±2% ,Ta=25OC , unless otherwise noted) Parameter Detect Voltage Hysteresis Range Supply Current Test circuit Symbol Conditions Min. Typ Max. Units -VDET - -VDET（S） ×0.98 -VDET(S) -VDET(S) ×1.02 V 0.03 0.06 0.1 V VDD=3V (below 2.5V) - 0.9 1.5 VDD=5V (2.5V-4.5V) - 1.4 2.8 VDD=7V (4.5V-6.5V) - 1.8 3.6 VDS=0.5V VDD=0.7V 0.01 0.19 -- Iout P-ch VDS=0.5V VDD=7V 1.7 3.4 -- VDD - 0.7 - 7 V 1 Td1 VDD=-VDET+1V DS low 130 200 290 ms 1 Td2 VDD=-VDET+1V DS high 110 220 330 us 5 - ±100 ±350 VHYS ISS Iout N-ch - 1 uA mA 2 3 Output Current Operating voltage Delay time Temperature characteristics ∆ − VDET ∆Ta • −VDET ∆Ta =-40℃ ~ 85℃ mA ppm/℃ Note： 1、-VDET(S) ：Specified Detection Voltage value 2、-VDET ：Actual Detection Voltage value 3、Release Voltage：+VDET=-VDET+VHYS Page3 www.belling.com.cn V1.2 4 1 BL8509B Test Circuits: 1. 2. 3. 4. 5. Page4 www.belling.com.cn V1.2 BL8509B Functional Description： ： 1. Basic Operation: CMOS Output (Active Low) 1-1. When the power supply voltage (VDD) is higher than the release voltage (+VDET), the Nch transistor is OFF and the Pch transistor is ON to provide VDD (high) at the output. Since the Nch transistor N1 in Figure 1 is OFF, the ( RB + RC ) • VDD R A + RB + RC . comparator input voltage is 1-2. When the VDD goes below +VDET, the output provides the VDD level, as long as VDD remains above the detection voltage (–VDET). When the VDD falls below –VDET (point A in Figure 2), the Nch transistor becomes ON, the Pch transistor becomes OFF, and the VSS level appears at the output. At this time the Nch RB • VDD R + RB . transistor N1 in Figure 1 becomes ON, the comparator input voltage is changed to A 1-3. When the VDD falls below the minimum operating voltage, the output becomes undefined, or goes to VDD when the output is pulled up to VDD. 1-4. The VSS level appears when VDD rises above the minimum operating voltage. The VSS level still appears even when VDD surpasses the –VDET, as long as it does not exceed the release voltage +VDET. 1-5. When VDD rises above +VDET (point B in Figure 2), the Nch transistor becomes OFF and the Pch transistor becomes ON to provide VDD at the output. The VDD at the OUT pin is delayed for Td due to the delay circuit. 2. Delay Circuit 2-1. Delay Time The delay circuit delays the output signal from the time at which the power voltage (VDD) exceeds the release voltage (+VDET) when VDD is turned on. The output signal is not delayed when the VDD goes below the detection voltage (–VDET). (Refer to Figure 2.) The delay time (tD) is a fixed value that is determined by a built-in oscillation circuit and counter. 2-2. DS Pin (ON/OFF Switch Pin for Delay Time) The DS pin should be connected to Low or High. When the DS pin is High, the output delay time becomes short since the output signal is taken from the middle of counter circuit (Refer to Figure 3). Page5 www.belling.com.cn V1.2 BL8509B Directions for use： ： 1、 Please use this IC within the stated maximum ratings. Operation beyond these limits may cause degrading or permanent damage to the device. 2、When a resistor is connected between the VDD pin and the input with CMOS output configurations, oscillation may occur as a result of voltage drops at RIN if load current(IOUT) exists.(refer to the Oscillation Description(1) below) 3、When a resistor is connected between the VDD pin and the input with CMOS output configurations, oscillation may occur as a result of through current at the time of voltage release even if load current(IOUT) does not exist. (refer to the Oscillation Description(2) below) 4、With a resistor connected between the VDD and the input, detect and release voltage will rise as a result of the IC’s supply current flowing through the VDD pin. 5、In order to stabilize the IC’s operations, please ensure that VDD pin’s input frequency’s rise and fall times are more than several u Sec/V. Oscillation Description： ： 1、 Output current oscillation with the CMOS output configuration When the voltage applied at IN rises, release operations commence and the detector’s output voltage increase. Load current(IOUT) will flow at RL. Because a voltage drop(RIN*IOUT) is produces at the RIN resistor, located between the input(IN) and the VDD pin. The load current will flow via the IC’s pin. The voltage drop will also lead to a fall in the voltage level at the VDD pin. When the VDD pin voltage level falls below the detect voltage level, detect operations will commence. Fllowing detect operations, load current flow will cease and since voltage drop at RIN will disapper, the voltage level at the VDD pin will rise and release operations will begin over again. Oscillation may occur with this “release-detect-release” repetition. Further, this condition will also appear via means of a similar mechanism during detect operations. Page6 www.belling.com.cn V1.2 BL8509B 2、 Oscillation as a result of through current Since the BL8509B series are CMOS IC’s, through current will flow when the IC’s internal circuit switching operates(during release and detect operations). Consequently, oscillation is liable to occur as a result of drops in voltage at the through current’s resistor(RIN) during release voltage operations.(refer to diagram 2) since hysteresis exists during detect operations, oscillation is unlikely to occur. Type Characteristics 1、 、SUPPLY CURRENT VS. AMBIENT TEMPERATURE VDD=5V,-VDET=2.63V VDD=2.5V,-VDET=2.63V Iss VS.TEMP 1.2 2.7 2.4 2.1 1.8 1.5 1.2 0.9 0.6 0.3 1 Is s (u A ) Is s (u A ) Iss VS.TEMP 0.8 0.6 0.4 0.2 -16 10 20 30 40 50 60 70 80 0 -16 10 90 100 110 120 20 30 40 TEMP(℃ ℃) -VDET=2.63V （T=25℃ ℃） V D E T(V ) Is s (u A ) 2 1.5 1 0.5 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 90 100 110 120 2.72 2.7 2.68 2.66 2.64 2.62 2.6 2.58 2.56 2.54 +VDET -VDET -16 10 20 30 40 50 60 70 80 90 100 110 120 ℃) TEMP(℃ VDD(V) Page7 80 VDET VS TEMP 2.5 1 70 3 、 DETECT,RELEASE VOLTAGE VS. AMBIENT TEMPERATURE -VDET=2.63V Iss VS VDD 0.5 60 TEMP(℃ ℃) 2 、 SUPPLY CURRENT VS. INPUT VOLTAGE 0 50 www.belling.com.cn V1.2 BL8509B 4、 、 OUTPUT CURRENT VS. INPUT VOLTAGE N-ch VDS=0.5V,-VDET=2.63V P-ch VDS=0.5V,-VDET=2.63V Iout(P) VS. VDD Iout(N) VS. VDD 12 T=-15℃ ℃ T=23℃ ℃ 8 Iout(m A ) Iou t(m A ) 10 T=85℃ ℃ 6 4 2 0 0.2 0.5 0.7 1 1.2 1.7 2.2 2.5 T=85℃ ℃ 2.7 3.2 3.5 T=23℃ ℃ 4 T=-15℃ ℃ 4.5 5 5.5 VDD(V) VDD(V) Page8 4 3.5 3 2.5 2 1.5 1 0.5 0 www.belling.com.cn V1.2 6 BL8509B Package Information SOT-23 DIM Millimeters Inches Min Max Min Max A 2.7 3.1 0.1063 0.122 B 1.7 2.1 0.0669 0.0827 b 0.35 0.5 0.0138 0.0197 C 1 1.2 0.0394 0.0472 c 0.1 0.25 0.0039 0.0098 d 0.2 - 0.0079 - E 2.1 2.64 0.0827 0.1039 e 1.2 1.4 0.0472 0.0551 SOT23-3 DIM Page9 Millimeters Inches Min Max Min Max A 2.7 3.1 0.1063 0.122 B 1.7 2.1 0.0669 0.0827 b 0.35 0.5 0.0138 0.0197 C 1 1.2 0.0394 0.0472 c 0.1 0.25 0.0039 0.0098 d 0.2 - 0.0079 - E 2.6 3 0.1023 0.1181 e 1.5 1.8 0.059 0.0708 www.belling.com.cn V1.2 BL8509B SOT23-5 DIM Page10 Millimeters Inches Min Max Min Max A 0.9 1.45 0.0354 0.057 A1 0 0.15 0 0.0059 A2 0.9 1.3 0.0354 0.0511 B 0.2 0.5 0.0078 0.0196 C 0.09 0.26 0.0035 0.0102 D 2.7 3.1 0.1062 0.122 E 2.2 3.2 0.0866 0.1181 E1 1.3 1.8 0.0511 0.0708 e 0.95REF 0.0374REF e1 1.90REF 0.0748REF L 0.1 0.6 0.0039 0.0236 a0 0 300 0 300 www.belling.com.cn V1.2