RT9824 Smart Multi-Voltage Detector General Description Features The RT9824 is an integrated smart multi-voltage detector supervising three power supply voltage levels including 5V, 5.4V and additional 3.3V, 12V or other voltage which can be determined by external divided resisters. z Capable of Monitoring Three Inputs Precisely z Detection Threshold Voltages ` VCC Connect to 5V or 3.3V Standby Power ` V5 : 5V x 80% ` V54 : 5.4V x 80% ` VADJ : 1V (Using Resistor Divider) Accuracy : ±2% RESET (Open Drain Output Active Low) Built-in Recovery Delay 300ms CTR (Open Drain Output Active Low) Manual Reset (MR) Function TSOT-23-8 Package RoHS Compliant and Halogen Free The RT9824 performs supervisory function by sending out RESET and CTR signals whenever the monitored voltages fall below 80% of voltage levels. The RESET and CTR signals will last the whole period before VCC recovering. Once the supervising voltages are recovered to higher than 80% of the voltage levels, the RESET and CTR signal will be released after 300ms delay time. z z z z z z MR (Manual Reset) controls CTR signal during three monitored power supply voltages at normal voltage levels. When MR signal is in logic high, the CTR signal will be pulled low immediately. However the RESET will not be interfered and will be kept at high level. z Applications z z The RT9824 is available in the TSOT-23-8 package. Ordering Information RT9824 z LCD TV or Monitors Consumer Electronic Products System Voltage Detector Pin Configurations V54 V5 VADJ 8 7 6 5 2 3 4 RESET GND MR Note : VCC (TOP VIEW) Package Type J8 : TSOT-23-8 Lead Plating System G : Green (Halogen Free and Pb Free) Richtek products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. CTR ` TSOT-23-8 Marking Information AF= : Product Code AF=DNN DNN : Date Code DS9824-01 April 2011 www.richtek.com 1 RT9824 Typical Application Circuit VDD RT9824 8 VCC 3.3V or 5V 12V R1 5 VADJ CTR 1 100k Pull Up CTR R2 Manual Reset VDD 4 MR 6 5V 5.4V µP V5 7 V54 RESET 2 100k Pull Up µP RESET GND 3 Functional Pin Description Pin No. 1 2 Pin Name CTR RESET Pin Function Control Output (Open Drain, Active-Low). Only when VCC is > POR, V5 is > 80%, V54 is > 80%, and VADJ is > 1V, the CTR will delay 300ms and become high. Once V5 or V54 or VADJ is <80%, the signal will become low. When MR is high, CTR will become low. RESET Output (Open Drain, Active-Low). Only when VCC is > POR, V5 is > 80%, V54 is > 80%, and VADJ is > 1V, the RESET will delay 300ms and become high. Once V5 or V54 or VADJ is < 80%, the signal will become low. 3 GND Ground. 4 MR 5 VADJ 6 V5 5V Voltage Detection Input. The detection threshold is 5V x 80%. 7 V54 54V Voltage Detection Input. The detection threshold is 5.4V x 80%. 8 VCC Connect this Pin to Standby Power from system. Manual Reset Input. Manual reset with internal pull high resister (1MΩ), H : CTR = Low; L : CTR signal is dependent on voltage detector output. Voltage Detection Input. Connect 12V or other power with external resister divider to this pin. The VADJ logic-high threshold voltage is 1V. Function Block Diagram VCC VREF Voltage Regulator RESET POR VADJ Voltage Detector (VTH = 1V) V5 Voltage Detector (VTH = 5V x 80%) V54 Voltage Detector (VTH = 5.4V x 80%) CTR Delay 300ms GND MR www.richtek.com 2 DS9824-01 April 2011 RT9824 Absolute Maximum Ratings z z z z z z z (Note 1) VCC, CTR, MR, RESET, V5, V54, VADJ ------------------------------------------------------------------------------ −0.3V to 6.5V Power Dissipation, PD @ TA = 25°C TSOT-23-8 --------------------------------------------------------------------------------------------------------------------- 0.435W Package Thermal Resistance (Note 2) TSOT-23-8, θJA --------------------------------------------------------------------------------------------------------------- 230°C/W Junction Temperature ------------------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------- 260°C Storage Temperature Range ---------------------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 3) HBM (Human Body Mode) ------------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions z (Note 4) Junction Temperature Range --------------------------------------------------------------------------------------------- −40°C to 125°C Electrical Characteristics (VCC = 5V, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Without load Min Typ Max Unit -- -- 200 μA 2.97 5 5.94 V VCC Supply Current IVCC VCC Operating Voltage VCC VCC POR Rising VPOR -- 2.8 -- V VCC POR Hysteresis VPOR_Hys -- 0.15 -- V Voltage Detector & MUTE Threshold V5 High Threshold Voltage V5TH 3.92 4 4.08 V V54 High Threshold Voltage V54 TH 4.23 4.32 4.41 V VADJ High Threshold Voltage VADJTH 0.98 1 1.02 V Manual Reset High Voltage VIH 2 -- -- V Manual Reset Low Voltage VIL -- -- 0.8 V 200 300 -- ms -- 20 -- μs Voltage Detector Deglitch and Delay Voltage Detectors Delay Time T DELAY Voltage Detectors Deglitch Time T DEGLITCH Output : Open Drain RESET Output Low Voltage VOL_RESET VCC = 3.3V, 5mA sinking current at RESET output -- -- 0.3 V CTR Output Low Voltage VOL_CTR VCC = 3.3V, 5mA sinking current at CTR output -- -- 0.3 V DS9824-01 April 2011 www.richtek.com 3 RT9824 Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. www.richtek.com 4 DS9824-01 April 2011 RT9824 Typical Operating Characteristics V5 Detector Deglitch Time vs. Temperature V5 Detector Delay Time vs. Temperature 40 425 400 375 350 325 300 VCC = 3.3V 275 VCC = 5V V5 Detector Deglitch Time (μs) V5 Detector Delay Time (ms) 450 35 30 VCC = 5V 25 20 VCC = 3.3V 15 10 250 -50 -25 0 25 50 75 100 -50 125 -25 0 Temperature (°C) V54 Detector Delay Time vs. Temperature 75 100 125 40 425 400 375 350 325 300 VCC = 3.3V 275 VCC = 5V V54 Detector Deglitch Time (μs) V54 Detector Delay Time (ms) 50 V54 Detector Deglitch Time vs. Temperature 450 250 35 30 VCC = 5V 25 20 VCC = 3.3V 15 10 -50 -25 0 25 50 75 100 125 -50 -25 0 Temperature (°C) 25 50 75 100 125 Temperature (°C) VADJ Detector Delay Time vs. Temperature VADJ Detector Deglitch Time vs. Temperature 450 40 425 400 375 350 325 300 VCC = 3.3V 275 VCC = 5V 250 -50 -25 0 25 50 Temperature (°C) DS9824-01 April 2011 75 100 125 VADJ Detector Deglitch Time (μs) VADJ Detector Delay Time (ms) 25 Temperature (°C) 35 30 VCC = 5V 25 20 VCC = 3.3V 15 10 -50 -25 0 25 50 75 100 125 Temperature (°C) www.richtek.com 5 RT9824 V5 Pin Response V54 Pin Response VCC = 5V VCC = 5V V5 (5V/Div) V54 (5V/Div) RESET (5V/Div) RESET (5V/Div) CTR (5V/Div) CTR (5V/Div) Time (100ms/Div) Time (100ms/Div) VADJ Pin Response MR Pin Response VCC = 5V VCC = 5V VADJ (1V/Div) MR (5V/Div) RESET (5V/Div) RESET (5V/Div) CTR (5V/Div) CTR (5V/Div) Time (100ms/Div) Time (5ms/Div) Supply Current vs. Temperature 250 Supply Current (μA) 225 200 175 VCC = 5V 150 VCC = 3.3V 125 100 -50 -25 0 25 50 75 100 125 Temperature (°C) www.richtek.com 6 DS9824-01 April 2011 RT9824 Application Information 0.50 Maximum Power Dissipation (W) The RT9824 smart voltage detector monitors three voltage levels at the same time to ensure the micro-processor is operated within the recommended input voltage range. In conventional reset IC application, to monitor one power rail needs one reset IC. The RT9824 can monitor three power rails simultaneously, by using just one reset IC. The RT9824 also provides a Manual Reset (MR) function for application easily. Glitch-rejection is implemented in the RT9824 to prevent it from false operation and to eliminate the additional de-bouncing circuitry. Single Layer PCB 0.45 0.40 0.35 0.30 TSOT-23-8 0.25 0.20 0.15 0.10 0.05 0.00 Thermal Considerations For continuous operation, do not exceed absolute maximum operation junction temperature. The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : 0 25 50 75 100 125 Ambient Temperature (°C) Figure 1. Derating Curves for RT9824 Package PD(MAX) = (TJ(MAX) − TA) / θJA Where T J(MAX) is the maximum operation junction temperature, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of RT9824, the maximum junction temperature is 125°C and TA is the maximum ambient temperature. The junction to ambient thermal resistance θJA is layout dependent. For TSOT-23-8 package, the thermal resistance θJA is 250°C/W on the standard JEDEC 51-3 single layer thermal test board. The maximum power dissipation at TA= 25°C can be calculated by following formula : PD(MAX) = (125°C − 25°C) / (230°C/W) = 0.435W for TSOT-23-8 package The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. For RT9824 package, the Figure 1 of derating curve allows the designer to see the effect of rising ambient temperature on the maximum power dissipation allowed. DS9824-01 April 2011 www.richtek.com 7 RT9824 Outline Dimension H D L C B b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.700 1.000 0.028 0.039 A1 0.000 0.100 0.000 0.004 B 1.397 1.803 0.055 0.071 b 0.220 0.380 0.009 0.015 C 2.591 3.000 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.585 0.715 0.023 0.028 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 TSOT-23-8 Surface Mount Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 5F, No. 95, Minchiuan Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)86672399 Fax: (8862)86672377 Email: [email protected] Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek. www.richtek.com 8 DS9824-01 April 2011