RT9801BGE

RT9801A/B User Programmable Micro-Power Voltage Detectors General Description The RT9801A/B is a micro-power voltage detector supervising the power supply voltage level for microprocessors (μP) or digital systems. It provides user programmable threshold levels with 0.1V step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 3μA. Selection of VTH is easily achieved through 3 pins connected to GND, VDD or floating for different threshold voltage settings. Two versions of threshold voltages, 1.5V to 4V and 2.5V to 5V, which are programmed in factory are offered by customer demands. The RT9801A/B performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold level. This reset signal will last the whole period before VDD recovering. Reset signal will release after VDD is recovered and last for the whole period of Reset Active Time-out period. RT9801A/B is N-Channel, open-drain output and provided in SOT-23-6 package. Features User Programmable Threshold 1.5V to 5V in 0.1V Step with ±3% Accuracy Low Supply Current 3μA Quick Reset within 20μs Built-in Recovery Delay 200ms Low Functional Supply Voltage 0.9V Small SOT-23-6 Package RoHS Compliant and 100% Lead (Pb)-Free Applications Computers Controllers Intelligent Instruments Critical μP and μC Power Monitoring Portable/Battery-Powered Equipment Pin Configurations (TOP VIEW) VSET1 VSET2 VDD 6 1 5 2 4 3 Ordering Information RT9801 Package Type E : SOT-23-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Reset Threshold A : 2.5V to 5V B : 1.5V to 4V VSET0 GND RESET SOT-23-6 Note : There is no pin1 indicator on top mark for SOT-23-6 type, and pin 1 will be lower left pin when reading top mark from left to right. Note : RichTek Pb-free and Green 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. 100%matte tin (Sn) plating. Typical Application Circuit μP VDD GND RESET VSET0 VSET1 RT9801 GND VSET2 RESET Pull Up VDD Marking Information For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail. DS9801AB-11 March 2007 RT9801 VTH = 2.5V in this example www.richtek.com 1 RT9801A/B Test Circuits VDD VDD A R 100K RESET Oscilloscopes VDD RT9801A/B GND RESET V RT9801A/B GND VDD V Detection Voltage Current Consumption VDD P.G RT9801A/B GND RESET 100K CRT CL 6V VDD VDD V RT9801A/B GND RESET A VRESET V Dynamic Response Output Transistor Current Functional Pin Description Pin Name VSET0 GND RESET VDD VSET1 VSET2 Pin Function Threshold Voltage Selection Pin Ground Pin Reset Pulse Output, Negative Pulse Power Pin Threshold Voltage Selection Pin Threshold Voltage Selection Pin Note : Threshold Voltage Setting refer to the Table.1 Function Block Diagram VDD Internal Clock VSET0 VSET1 VSET2 Threshold Voltage Setting POR Power On Reset RESET VSET CMP Timer N MOS GND www.richtek.com 2 DS9801AB-11 March 2007 RT9801A/B Absolute Maximum Ratings Terminal Voltage (with Respect to GND) VDD ------------------------------------------------------------------------------------------------------------------------ –0.3V to 6.0V All Other Inputs -------------------------------------------------------------------------------------------------------- –0.3V to VDD+0.3V Input Current, VDD ----------------------------------------------------------------------------------------------------- 20mA Continuous Power Dissipation, PD @ TA = 25°C SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.25W Operating Junction Temperature Range -------------------------------------------------------------------------- –40°C to 125°C Storage Temperature Range ---------------------------------------------------------------------------------------- –65°C to 125°C Package Thermal Resistance SOT-23-6, θJA ----------------------------------------------------------------------------------------------------------- 250°C /W Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C Electrical Characteristics (VDD = 3V, unless otherwise specified) Parameter Operating VDD Range Supply Current Reset Threshold Threshold Voltage Accuracy VDD Drop to Reset Delay Reset Active Timeout Period VSET Pin Input Threshold RESET Output Voltage Symbol VDD IDD VTH ΔVTH tRD tRP VIL VIH VOL Test Conditions Min 0.9 Typ ---Note1 --200 0.15VDD 0.85VDD 0.4 Max 6 3 3.3 -3 20 280 ---- Units V μA V % μs ms V V VDD = 1.5V ~ 3.5V, ISINK = 0 VDD = 3.5V ~ 5V, ISINK = 0 TA = 27°C TA = 27°C Drop = -125mV VDD ≥ 1.02×VTH, Programmable TA = 27°C TA = 27°C VDD < VTH, ISINK = 3.5mA -----120 ---- Timing Diagram VDD VTH VDD VTH Drop tRP VRESET VRESET tRD DS9801AB-11 March 2007 www.richtek.com 3 RT9801A/B Table 1: Pin Conditions for Programmable Threshold Voltage Setting RT9801A 5.0 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 RT9801B 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 VSET0 H H H H H H H H H F F F F F F F F F L L L L L L L L VSET1 H H H F F F L L L H H H F F F L L L H H H F F F L L VSET2 H F L H F L H F L H F L H F L H F L H F L H F L H F Note : 1. H : Connected to VDD 2. L : Connected to GND 3. F : Floating www.richtek.com 4 DS9801AB-11 March 2007 RT9801A/B Typical Operating Characteristics N-Ch Driver Sink Current vs. VRESET 7 6 N-Ch Driver Sink Current vs. VRESET 12 VDD = 2.2V Sink Current I SINK (mA) VDD = 1.7V 5 4 Sink Current I SINK (mA) 10 8 6 4 2 0 VDD = 2.0V VDD = 1.5V 3 2 1 0 0 0.5 1 1.5 2 2.5 3 VDD = 1.5V TA = 25°C VTH = 0 0.5 1 1.5 2 2.5 3 TA = 25°C VTH = 2V VRESET (V) VRESET (V) N-Ch Driver Sink Current vs. VRESET 18 15 12 9 6 3 36 N-Ch Driver Sink Current vs. VRESET VDD = 4.0V VDD = 3.5V VDD = 3.0V 18 VDD = 2.8V Sink Current I SINK (mA) Sink Current I SINK (mA) 30 24 VDD = 2.5V 12 VDD = 2.0V VDD = 2.0V 6 VDD = 1.5V 0 0 0.5 1 1.5 2 TA = 25°C VTH = 3V 2.5 3 VDD = 1.5V 0 0 1 2 3 TA = 25°C VTH = 4.5V 4 VRESET (V) VRESET (V) N-Ch Driver Sink Current vs. VRESET 40 7 VRESET v s. VDD TA = 25°C 5.0V 4.5V 3.0V 2.4V 2.0V VDD = 4.5V 6 5 Sink Current I SINK (mA) 32 VDD = 4.0V 24 VDD = 3.5V VDD = 3.0V VRESET (V) TA = 25°C VTH = 5V 4 3 2 1 0 0.0 1.0 2.0 16 VDD = 2.5V 8 VDD = 2.0V VDD = 1.5V 0 0 1 2 3 4 5 3.0 4.0 5.0 6.0 VRESET (V) VDD (V) DS9801AB-11 March 2007 www.richtek.com 5 RT9801A/B Supply Current vs. Input Voltage 4 Supply Current vs. Input Voltage 4 Supply Current IDD (uA) Supply Current IDD (uA) 3 TA = 25°C TA = 80°C 3 TA = 25°C TA = 80°C 2 2 TA = -30°C 1 TA = -30°C 1 VTH = 2V 0 0 1 2 3 4 5 6 VTH = 2.4V 0 0 2 4 6 Input Voltage VDD (V) Input Voltage VDD (V) Supply Current vs. Input Voltage 4 5 Supply Current vs. Input Voltage TA = 80°C TA = 25°C TA = 80°C Supply Current IDD (uA) 3 Supply Current IDD (uA) TA = 25°C 4 3 2 TA = -30°C 2 TA = -30°C 1 1 VTH = 3V 0 0 1 2 3 4 5 6 0 0 1 2 3 4 VTH = 4.5V 5 6 Input Voltage VDD (V) Input Voltage VDD (V) Supply Current vs. Input Voltage 5 Reset Threshold Deviation vs. Temperature 5.2 4.8 Supply Current IDD (uA) Threshold Voltage (V) 4 TA = 80°C VTH = 4.4 4 3.6 3.2 2.8 VTH = 4.5V 3 TA = -30°C 2 TA = 25°C 1 VTH = VTH = 2.5V VTH = 5V 0 0 1 2 3 4 5 6 2.4 -40 -15 10 35 60 85 Input Voltage VDD (V) Temperature (°C) www.richtek.com 6 DS9801AB-11 March 2007 RT9801A/B N-Ch Driver Sink Current vs. Input Voltage 10 N-Ch Driver Sink Current vs. Input Voltage 10 Sink Current I SINK (mA) 8 TA = -30°C 6 Sink Current I SINK (mA) VTH = 2.0V VRESET = 0.5V 8 VTH = 2.5V VRESET = 0.5V TA = -30°C TA = 25°C 6 TA = 25°C 4 4 2 2 TA = 80°C TA = 80°C 0 0 0.5 1 1.5 2 2.5 3 0 0 0.5 1 1.5 2 2.5 3 Input Voltage VDD (V) Input Voltage VDD (V) N-Ch Driver Sink Current vs. Input Voltage 12 10 8 6 4 2 0 0 0.5 1 1.5 2 2.5 3 3.5 N-Ch Driver Sink Current vs. Input Voltage 16 14 VTH = 3V VRESET = 0.5V TA = -30°C Sink Current I SINK (mA) Sink Current I SINK (mA) VTH = 4.5V VRESET = 0.5V TA = -30°C 12 10 8 6 4 2 0 0 1 2 3 4 5 TA = 25°C TA = 25°C TA = 80°C TA = 80°C Input Voltage VDD (V) Input Voltage VDD (V) N-Ch Driver Sink Current vs. Input Voltage 18 Reset Active Timeout Period vs. Temperature 350 TA = -30°C Reset Active Timeout Period (ms) Sink Current I SINK (mA) 15 12 VTH = 5V VRESET = 0.5V 300 250 VTH = TA = 25°C 9 6 3 0 0 1 2 3 4 5 6 VTH = 2.4V 200 VTH = VTH = 150 TA = 80°C VTH = 4.5V 100 50 -40 -15 10 35 60 85 Input Voltage VDD (V) Temperature (°C) DS9801AB-11 March 2007 www.richtek.com 7 RT9801A/B VDD Drop to Reset Delay vs. Temperature VDD Drop to Reset Delay ( us ) A VTH = 4.0 3.0 2.5 2.0 1.5 1.0 0.5 0.0 VDD Drop to Reset Delay vs. Temperature VTH = VDD Drop to Reset Delay ( us ) A 3.0 2.0 VDROP = 200mV VDROP = 150mV VDROP = 200mV VDROP = 150mV 1.0 VDROP = 250mV 0.0 -40 -15 10 35 60 85 VDROP = 250mV -40 -15 10 35 60 85 Temperature((°C) C) Temperature ( °C) ( 1.5 VDD Drop to Reset Delay vs. Temperature VDD Drop to Reset Delay ( us ) A VTH = 1.5 VDD Drop to Reset Delay vs. Temperature VTH = VDD Drop to Reset Delay ( us ) A 1.2 1.2 VDROP = 200mV 0.9 VDROP = 150mV 0.9 VDROP = 200mV VDROP = 150mV 0.6 VDROP = 250mV 0.6 VDROP = 250mV 0.3 0.3 0.0 -40 -15 10 35 60 85 0.0 -40 -15 10 35 60 85 Temperature (°C) Temperature (°C) 1.5 VDD Drop to Reset Delay vs. Temperature VTH = 1000 Output Delay Time vs. Load Capacitance Output Delay Time t P (ms) VDD Drop to Reset Delay ( us ) A 1.2 0.9 VDROP = 200mV VDROP = 150mV 100 VTH = VTH = 10 0.6 VTH = VTH = VDROP = 250mV 0.3 VTH = 3V 0.0 -40 -15 10 35 60 85 1 0.0001 0.001 0.01 TA = 25°C 0.1 Temperature (°C) Load Capacitance COUT ( uF ) www.richtek.com 8 DS9801AB-11 March 2007 RT9801A/B Outline Dimension H D L C B b A A1 e Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.889 0.000 1.397 0.250 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610 Dimensions In Inches Min 0.031 0.000 0.055 0.010 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024 SOT-23-6 Surface Mount Package Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com DS9801AB-11 March 2007 www.richtek.com 9