ACE432N Precision adjustable shunt voltage reference Description The ACE432N is low-voltage three-terminal adjustable voltage references, with specified thermal stability over applicable industrial and commercial temperature ranges. Output voltage can be set to any value between VREF (1.24V) and 20V with two external resistors. These devices have a typical output impedance of 0.25Ω. Active output circuitry provides a very sharp turn-on characteristic, making the ACE432N excellent replacements for low-voltage Zener diodes in many applications, including onboard regulation and adjustable power supplies. Features Low-Voltage Operation --- Down to 1.24V Adjustable Output Voltage, Vo=Vref to 20V Low Operational Cathode Current --- 80uA (Typ) 0.25Ω Typical Output Impedance Application Battery Power Equipment Linear Regulators Switch Power Supply Cellular Phone Digital Cameras Computer Disk Drivers Instrumentation Absolute Maximum Ratings Parameter Symbol Max Unit Cathode Voltage VZ 20 V Continuous Cathode Current IZ 100 mA Reference Current Thermal resistance junction to ambient SOT-23-5L SOT-23-3 Operating junction temperature IREF 3 mA Storage temperature range TSTG θJA TJ O 206 C/W 206 -40 to 150 OC -65 to 150 O C The IC has a protection circuit against static electricity. Do not apply high static electricity or high voltage that exceeds the performance of the protection circuit to the IC. VER 1.4 1 ACE432N Precision adjustable shunt voltage reference Packaging Type SOT-23-5L 5 SOT-23-3 4 1 2 3 3 SOT-23-5L SOT-23-3 Description 1 3 2 Cathode 5 3 Anode 4 1 Ref 1.2 2 NC Ordering information ACE432N X XX + H Halogen - free Pb - free BN : SOT-23-5L BM : SOT-23-3 Reference Voltage accuracy : A : 0.5% B : 1% Typical Application Circuit VIN R VOUT R1 VREF R2 GND 1 2 3 GND VER 1.4 2 ACE432N Precision adjustable shunt voltage reference Block Diagram Electrical Characteristics Parameter Reference Voltage Symbol Test Conditions TA=25℃ 0.5% VREF 1.0% VZ=VREF, IZ=10mA TA=-40℃~80℃ TA=25℃ TA=-40℃~80℃ Min. Typ. Max. Unit 1.234 1.24 1.246 1.222 1.258 V 1.228 1.24 1.252 1.215 1.265 VREF Temp Deviation VDEV VZ=VREF, IZ=10mA TA=-40℃~80℃ 10 25 mV Ratio of change in VREF to change in cathode voltage ΔVREF/ΔVZ IZ=10mA ΔVZ=16V to VREF -1.0 -2.7 mV/V Reference Input current IREF 0.15 0.5 μA IREF Temp Deviation IREF(DEV) 0.1 0.4 μA Off-state cathode current IZ(OFF) 0.5 1.0 μA 0.25 0.4 Ω 30 80 μA Dynamic output impedance Minimum Operation Current RZ IZ(MIN) IZ =10mA, R1=10KΩ, R2=∞ IZ=10mA, TA=-40℃~80℃ R1=10KΩ, R2=∞ VZ=6V VREF=0 VZ=12V IZ=1mA~100mA VZ=VREF, f≦1KHz VZ=VREF VER 1.4 3 ACE432N Precision adjustable shunt voltage reference Application Circuit Figure 1. Test Circuit for VKA=VREF Figure 2. Test Circuit for VKA>VREF, VO=VKA=VREF VO=VKA=VREF*1(1+R1/R2)+IREF*R1 Figure 3. Test Circuit for IK(OFF) Figure 4. Test Circuit for VKA>VREF, VO=VKA=VREF*1(1+R1/R2)+IREF*R1 ACE432N Figure 5. Flyback with isolation using ACE432N as voltage reference and error amplifier * To improve the stability of output voltage, Figure 4, a 0.1uF capacitor is recommended between cathode to anode. VER 1.4 4 ACE432N Precision adjustable shunt voltage reference Performance characteristics VER 1.4 5 ACE432N Precision adjustable shunt voltage reference Performance Characteristics VER 1.4 6 ACE432N Precision adjustable shunt voltage reference Performance Characteristics VER 1.4 7 ACE432N Precision adjustable shunt voltage reference Performance Characteristics VER 1.4 8 ACE432N Precision adjustable shunt voltage reference Packing Information SOT-23-5L VER 1.4 9 ACE432N Precision adjustable shunt voltage reference Packing Information SOT-23-3 VER 1.4 10 ACE432N Precision adjustable shunt voltage reference Notes ACE does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ACE Electronics Co., LTD. As sued herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ACE Technology Co., LTD. http://www.ace-ele.com/ VER 1.4 11