UNISONIC TECHNOLOGIES CO., LTD ULVH431B Preliminary CMOS IC LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR DESCRIPTION The UTC ULVH431B is a low-voltage 3-terminal programmable shunt regulator with guaranteed thermal stability over full applicable industrial and commercial temperature ranges. The output voltage of UTC ULVH431B can be set to any value between VREF (1.24V) and the corresponding maximum cathode voltage (18V) with two external resistors. The device operates from a lower voltage (1.24V) than the widely used TL431 and TL1431 shunt-regulator references. The UTC ULVH431B is an ideal voltage reference in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies when it is used with an opto-coupler. It has a typical output impedance of 0.25Ω. Active output circuitry supplies a very sharp turn-on characteristic, which makes the UTC ULVH431B very good substitute for low-voltage Zener diode in many applications such as adjustable power supplies and on-board regulation. FEATURES * Adjustable output voltage, VO=VREF to 18 V * Low-Voltage operation: VREF= 1.24 V * Wide operating cathode current range: 55µA to 50mA * Reference voltage tolerances at 25°C * 0.25-Ω typical output impedance * -40°C ~ 125°C specifications ORDERING INFORMATION Ordering Number Package ULVH431BG-AE2-R ULVH431BG-AE3-R SOT-23-3 SOT-23 www.unisonic.com.tw Copyright © 2016 Unisonic Technologies Co., Ltd Pin Assignment 1 2 3 K R A K R A Packing Tape Reel Tape Reel 1 of 6 QW-R103-115 .a ULVH431B Preliminary CMOS IC MARKING H431B PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 PIN NAME CATHODE REF ANODE DESCRIPTION Cathode voltage Reference voltage Anode voltage BLOCK DIAGRAM CATHODE + REF VREF=1.24V ANODE UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-115 .a ULVH431B Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Cathode Voltage (Note 1) VKA 20 V Cathode Current Range IK -25 ~ 50 mA Reference Current Range Iref -0.05 ~ 3 mA Operating Virtual Junction Temperature TJ 150 °C Storage Temperature Range TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL RESISTANCES CHARACTERISTICS PARAMETER SYMBOL RATINGS Package Thermal Impedance (Note 2) θJA 206 Note: Voltage values are with respect to the anode terminal, unless otherwise noted. UNIT °C/W RECOMMENDED OPERATING CONDITIONS PARAMETER Cathode Voltage Cathode Current (Continuous) Operating Free-Air Temperature Range UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw SYMBOL VKA IK TA MIN VREF 0.1 -40 TYP MAX 18 50 125 UNIT V mA °C 3 of 6 QW-R103-115 .a ULVH431B Preliminary CMOS IC ELECTRICAL CHARACTERISTICS (TA=25°C free-air temperature, unless otherwise specified) PARAMETER Reference Voltage VREF Deviation Over Full Temperature Range (Note 2) Ratio of VREF Change to Cathode Voltage Change Reference Terminal Current Iref Deviation Over Full Temperature Range (Note 2) Minimum Cathode Current for Regulation Off-State Cathode Current SYMBOL VREF VREF(dev) ∆VREF ∆VKA Iref Iref(dev) IK(min) TEST CONDITIONS TA=25°C VKA=VREF, TA=Full Range IK=10mA (Note 1 and Figure 1) VKA=VREF, IK=10mA (Note 1 and Figure 1) IK=10mA (see Figure 2), VKA=VREF~18V IK=10mA, R1=10kΩ, R2=OPEN (see Figure 2) IK=10mA, R1=10kΩ, R2=Open (see Note 1 and Figure 2) VKA=VREF (see Figure 1) MIN 1.234 TYP 1.24 MAX 1.246 UNIT V 1.265 V 11 31 mV -1.5 -2.7 mV/V 0.1 0.5 µA 0.15 0.5 µA 60 100 µA 1.221 IK(off) VREF=0, VKA=18V (see Figure 3) 0.02 0.1 µA VKA=VREF, f≤1kHz, IK=0.1mA~50mA 0.25 0.4 Ω Dynamic Impedance (Note 3) |zKA| (see Figure 1) Notes: 1. Full temperature ranges are: -40°C~125°C for ULVH431B. 2. The deviation parameters VREF(dev) and Iref(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature VREF( dev ) ( ) × 106 ppm VREF (TA = 25°C) coefficient of the reference input voltage, αVREF, is defined as: αVREF ( )= ∆TA °C where ∆TA is the rated operating free-air temperature range of the device. αVREF can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower temperature. ∆VKA 3. The dynamic impedance is defined as: zka = ∆IK When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of R1 ∆V the circuit is defined as: zka = ≈zka × (1+ ) R2 ∆I UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R103-115 .a ULVH431B Preliminary CMOS IC EQUIVALENT SCHEMATIC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R103-115 .a ULVH431B Preliminary CMOS IC PARAMETER MEASUREMENT INFORMATION VO VIN IK(off) Figure 3. Test Circuit for IK(off) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R103-115 .a