RT9807 RICHTEK | Alldatasheet

Document overview

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Technical content

Features

zzzzz Monitor System Voltages from 0.9V to 5.5V zzzzz Capacitor-Adjustable Reset Timeout Period zzzzz Manual Reset Input zzzzz Low Quiescent Current zzzzz High Accuracy ±±±±±1.5% zzzzz Low Functional Supply Voltage 0.9V zzzzz N-Channel Open-Drain Output zzzzz Small SOT-23-5 Package zzzzz RoHS Compliant and Halogen Free

Applications

z Critical uP and uC Power Monitoring z Portable/Battery-Powered Equipment Typical Application Circuit Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. GND VDD CT RST MR RT9807 GND ResetRSTVDD MR CIN 1uF CCT 10nF CT R 470k VDD RT9807- Package Type B : SOT-23-5 Lead Plating System G : Green (Halogen Free and Pb Free) Output Voltage 12 : 1.2V 13 : 1.3V 32 : 3.2V 33 : 3.3V

DS9807-01 April 2011www.richtek.com Recommended Operating Conditions (Note 4) Function Block Diagram Functional Pin Description Pin No. Pin Name Pin Function 1 RST Reset Output Pin. (Open drain) 2 GND Ground Pin. 3 MR Manual Reset Pin. 4 CT Connect an external capacitor for setting reset timeout period. 5 VDD Supply Voltage Input Pin. Absolute Maximum Ratings (Note 1) z Power Dissipation, PD @ TA = 25°C z Package Thermal Resistance (Note 2) z ESD Susceptibility (Note 3) Timeout Setting Comparator VREF Manual Reset VDD RST CT N-MOSFET GND MR

DS9807-01 April 2011 www.richtek.com

Electrical Characteristics

(TA = 25 °C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Operating VDD Range V DD 0.9 -- 5.5 V Supply Current I DD V TH = 3V, VDD = 4.5V -- 3 5 μA Reset Threshold V TH 1.2 -- 3.3 V Threshold Voltage Accuracy ΔVTH −1.5 -- 1.5 % Threshold Voltage Hysteresis V HYS -- 50 x V TH -- mV Reset Threshold T empco -- 100 -- ppm/ °C VDD Drop to Reset Delay t RP Drop = V TH – 250mV -- 100 -- μs RST Output Voltage Low (Note 5) VOL V DD < VTH(min.), ISINK = 3.5mA -- -- 0.4 V Logic-High V IH 0.7V DD -- -- MR Input Threshold voltage Logic-Low V IL -- -- 0.25V DD V MR Glitch Rejection -- 80 -- ns MR to Reset Propagation Delay t MR -- 2 -- μs MR Pull-up Resistance R MR -- 20 -- k Ω CCT = 1500pF 3.35 4.375 5.40 Reset Timeout Period t RP CCT = 0pF -- 0.275 -- ms CT Source Current I RAMP -- 240 -- nA CT Source Threshold Voltage V TH-RAMP -- 0.65 -- V CT Threshold Hysteresis -- 33 -- mV Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. 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 remain possibility to affect device reliability. Note 2. θ JA is measured in natural convection at T A = 25°C on a low effective 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. Note 5. The voltage VOL can be calculated by VOL = VDD - Ir x R. Where R is the pull-up resistor and Ir is the current flowing through the pull-up resistor. For typical application R = 100k Ω, VOL is less than 0.2V.

DS9807-01 April 2011www.richtek.com Typical Operating Characteristics Detector Threshold vs. Temperature 1.4 1.45 1.5 1.55 1.6 1.65 1.7 -50 -25 0 25 50 75 100 125 Temperature (°C) Detector Threshold (V) VDD = 5V, CT Open, R = 470kΩ Rising Falling Supply Current vs. Input Voltage Input Voltage (V) Supply Current (μA) TA = −40°C TA = 25°C TA = 125°C CT Open TA = 85°C CT Threshold Voltage vs. Temperature 0.6 0.61 0.62 0.63 0.64 0.65 0.66 0.67 -50 -25 0 25 50 75 100 125 Temperature (°C) CT Threshold Voltage (V) Rising Falling R = 470kΩ Power On Reset Delay Time vs. Temperature 100 150 200 250 300 350 -50 -25 0 25 50 75 100 125 Temperature (°C) Power On Reset Delay Time ( μs) VDD = 5V, CT Open, R = 470kΩ VDD Drop Reset Delay Time vs. Temperature 110 130 150 - 5 0- 2 5 0 2 5 5 0 7 51 0 0 1 2 5 Temperature (°C) VDD Drop Reset Delay Time ( μs) VDD = 5V, CT Open, R = 470kΩ Reset Delay Time vs Capacitance 0.1 100 1000 10000 0.001 0.01 0.1 1 10 100 1000 Capacitance (nF) Reset Delay Time (ms) VDD = 5V, R = 470kΩ

DS9807-01 April 2011 www.richtek.com Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the ri ght to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property inf ringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications i s assumed by Richtek. Richtek Technology Corporation Taipei Office (Marketing) 5F, No. 95, Minchiuan Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@richtek.com Outline Dimension A e b B D C H L SOT-23-5 Surface Mount Package Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.889 1.295 0.035 0.051 A1 0.000 0.152 0.000 0.006 B 1.397 1.803 0.055 0.071 b 0.356 0.559 0.014 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024