Adjustable Precision Shunt Regulator (Preliminary) Description CYT432L Features The CYT432L is a low voltage three terminal ¾ Low voltage operation (1.24V) adjustable shunt regulator with a guaranteed ¾ Adjustable output voltage V0 =VREF to 8V thermal temperature ¾ Wide operating current range 60µA to 100mA ranges. The output voltage can be set to any value ¾ Low dynamic output impedance 0.30Ω (Typ.) between VREF (approximately 1.24 V) to 8V with two ¾ Trimmed bandgap design up to + 0.5%. external resistors. This device has a typical output ¾ ESD rating is 2.5KV(Per MIL-STD-883D) impedance ¾ Available in Lead-Free Packages. stability of over 0.30Ω. applicable Active output circuitry provides a very sharp turn on characteristic, making this device excellent replacement for Zener diodes in many applications. The CYT432 is characterized for operation from 0oC to 105oC, and four package options (SOT-23 and TO-92) allow the designer the opportunity to select the proper package for their applications. Application ¾ Linear Regulators ¾ Adjustable Supplies ¾ Switching Power Supplies ¾ Battery Operated Computers ¾ Instrumentation ¾ Computer Disk Drives Pin Configuration SOT-23-3, SC59-3L TO-92 (Top View) (Top View) Marking Information Package Marking Production Year Code Production Week Code Lead-Free Package Starting with S, a bar on top of S is for production SOT-23-3 SC59-3L year 2001, and underlined S is for year 2002. Lead-free package is A-Z: 1-26 CYT4 32LW The next character is marked on top for 2003, and indicated by a dot on a-z: 27-52 underlined for 2004. The naming pattern continues top of the week code. with consecutive characters for later years. WW TO-92 CYT432L YY is for the year of production. 04 means YYWW the product is manufactured in year of 2004. is for production. the week of 26 means the product is manufactured in the 26th week Lead-free indicated package by LF is after YYWW. Preliminary and all contents are subject to change without prior notice. 1 Adjustable Precision Shunt Regulator (Preliminary) CYT432L Absolute Maximum Rating Parameter Symbol Maximum Units Cathode Voltage VKA 8 V Continuous Cathode Current I KA 150 mA Reference Current I REF 3 mA Operating Junction Temperature Range TJ 150 °C Storage Temperature Range TSTG -45 to 150 °C Thermal Resistance θ JA Lead Temperature (Soldering) 10 seconds 230 (SOT-23-3) °C/W 220 (TO-92) TLEAD 260 °C Electrical Characteristics Parameter Symbol Test Conditions & Circuit Min Typ Max 1234 1240 1246 Test circuit #1 1228 1240 1252 VKA = VREF, IKA = 10mA 1215 1240 1265 1221 1240 1259 -- 10 25 mV -- -1.0 -2.7 mV/V -- 0.15 2 µA -- 0.10 0.50 µA -- 60 100 µA -- 0.04 0.8 µA -- 0.30 1 Ω 0.5% Reference 1.0% Voltage 1.5% VREF 2.0% Deviation of Reference Voltage over Full Temperature Range Ratio of Change in Reference Voltage to the Change in Cathode Voltage Reference Current Deviation of Reference Current over Full Temperature Range Minimum Cathode Current for Regulation Off-state Cathode Current Unit mV Test circuit #1 VI(DEV) VKA = VREF, IKA = 10mA, TA = 0°C - 105°C ∆VREF/∆VKA IREF Test circuit #2 IKA = 10mA, ∆VKA = 8V to VREF Test circuit #2 IKA = 10mA, R1=10kΩ, R2 = ∞ Test circuit #2 II(DEV) IKA = 10mA, R1=10kΩ, R2 = ∞ TA = 0°C - 105°C IMIN IOFF Test circuit #1 VKA = VREF Test circuit #3 VKA = 8V, VREF = 0 Test circuit #1 Dynamic Impedance | ZKA | IKA = 100µA - 80mA, VKA = VREF, f ≤ 1kHZ Preliminary and all contents are subject to change without prior notice. 2 Adjustable Precision Shunt Regulator (Preliminary) CYT432L Typical Performance Characteristics Cathode Current VS Cathode Voltage Cathode Current (mA) 150 100 50 0 -50 -100 -150 -1.5 -1 -0.5 0 0.5 1 1.5 Cathode Voltage (V) Reference Volgate VS Temperature （Iload=10mA） Reference Volgate (V) 1.260 1.250 1.240 1.230 1.220 1.210 1.200 0 30 60 90 120 150 Temperature (℃) Reference Input Current VS Temperature （R1=10K，R2=∞，Iload=10mA） Reference Current (nA) 1000 800 600 400 200 0 0 30 60 90 120 150 Temperature (℃) Preliminary and all contents are subject to change without prior notice. 3 Adjustable Precision Shunt Regulator (Preliminary) CYT432L Stability Boundary Condition 100 IKA (mA) 80 60 40 20 VKA=VREF (1.24V) 1 0.1 0.01 0.001 0 CL (uF) VKA=2V VKA=3V The areas under the curves represent conditions that may cause the device to oscillate. For VKA = 2V and 3V curves, R2 and VBAT were adjusted to establish the initial VKA and IK conditions with CL = 0. VBAT and CL then were adjusted to determine the ranges of stability. As the graph suggested, CYT432L is unconditional stable with IK from 0 to 100mA and with CL from 0.001uF to 1uF. Preliminary and all contents are subject to change without prior notice. 4 Adjustable Precision Shunt Regulator (Preliminary) Symbol Diagram CYT432L Block Diagram Cathode Cathode Ref + Ref Vref Anode Anode Test Circuits Input V KA Input VKA I KA Input VKA I off I KA R1 Iref R2 Vref Vref R1 VKA = Vref (1+ ) + Iref x R1 R2 Test Circuit 1: Test Circuit 2: Test Circuit 3: VKA = VREF VKA > VREF Off State Current Application Circuit VIN R VOUT R1 CYT432 Vref VOUT = Vref (1+R1 ) R2 R2 GND Preliminary and all contents are subject to change without prior notice. 5 Adjustable Precision Shunt Regulator (Preliminary) CYT432L OUTLINE DRAWING SOT-23-3 C J DIMENSIONS INCHES MM MIN MAX MIN MAX H B N DIM D A E G F K L A B C D E F G H J K L 0.110 0.047 0.083 0.035 0.070 0.018 0.015 0.0005 0.034 0.003 - 0.120 0.055 0.104 0.040 0.080 0.024 0.020 0.004 0.040 0.007 0.027 2.80 1.20 2.10 0.89 1.78 0.45 0.37 0.013 0.887 0.085 - 3.04 1.40 2.64 1.03 2.05 0.60 0.51 0.10 1.02 0.18 0.69 OUTLINE DRAWING SC59-3L DIM H A E A1 B e1 D L SC 59-3L Q L1 C A A1 B C D H E e e1 L1 L Q N DIMENSIONS INCHE MM MIN MAX MIN MAX 0.035 0.043 0.90 1.10 0.0004 0.005 0.01 0.13 0.012 0.020 0.30 0.50 0.004 0.008 0.09 0.20 0.110 0.122 2.80 3.10 0.098 0.122 2.50 3.10 0.059 0.067 1.50 1.70 0.037REF 0.075REF 0.008 0.014 0℃ 0.95REF 1.90REF 0.022 0.031 10℃ 0.20 0.35 0℃ 0.55 0.80 10℃ OUTLINE DRAWING TO-92 A B D N DIM E G F H K J A B E F G H J K DIMENSIONS INCHES MM MIN MAX MIN MAX 0.175 0.170 0.500 0.016 0.045 0.095 0.080 0.125 0.205 0.210 0.610 0.021 0.055 0.105 0.105 0.165 Preliminary and all contents are subject to change without prior notice. 4.445 4.318 12.70 0.407 1.143 2.413 2.032 3.175 5.207 5.334 15.50 0.533 1.397 2.667 2.667 4.191 6