ACE432 Precision adjustable shunt voltage reference Description The ACE432 is a low voltage three terminal adjustable shunt regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage can be set to any value between VREF )approximately 1.24V) to 8V with two external resistors. The device has a typical output impedance of 0.30Ω. Active output circuitry provides a very sharp turn on characteristic, making this device excellent replacement for Zener diodes in many applications. The ACE432 is characterized for operation from -40℃ to 105℃, and two package options (SOT-23-3 and TO-92) allow the designer the opportunity to select the proper package for their applications. Features Low voltage operation (1.24V) Adjustable output voltage VD=VREF to 8V Wide operating current range 60μA to 100mA Low dynamic output impedance 0.30Ω (Typ.) Trimmed bandgap design up ±0.5% ESD rating is 2.5KV (Per MIL-STD-883D) Application Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives Absolute Maximum Ratings Parameter Symbol Max Unit VKA 8 V Continuous Cathode Current IKA 150 mA Reference Input Current Thermal resistance junction to ambient TO-92 SOT-23-3 Operating junction temperature IREF 3 mA θJA 220 230 150 Cathode to Anode Voltage (Note 2) Storage temperature range Lead temperature (soldering) 10sec TJ TSTG TLEAD O C/W O C - 45 to 150 O C 260 O C Note 1: Exceeding these rating could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. Note 2: Voltage values are with respect to the anode terminal unless otherwise noted. VER 1.3 1 ACE432 Precision adjustable shunt voltage reference Packaging Type Description TO-92 SOT-23-3(A) SOT-23-3(B) Cathode 1 2 1 Anode 2 3 3 Ref 3 1 2 NC Ordering information ACE432 XX XXX + H Halogen - free Pb - free EP : TO-92 BMA: SOT-23-3(A) BMB: STO-23-3(B) Reference Voltage accuracy : A : 0.5% B : 1% C: 1.5% D: 2% VER 1.3 2 ACE432 Precision adjustable shunt voltage reference Electrical Characteristics Parameter Symbol Test Conditions 0.5% Reference Voltage 1.0% 1.5% Min. Typ. Max. Unit 1.234 1.240 1.246 VREF VKA=VREF, IKA=10mA Test Circuit #1 2.0% 1.228 1.240 1.252 V 1.221 1.240 1.259 1.215 1.240 1.265 Deviation of reference voltage over full temperature range VI(DEV) Ratio of change in reference voltage to the change in cathode voltage ΔVREF/ΔKA Reference current IREF Deviation of Reference current over full temperature range II(DEV) Minimum cathode current for regulation IMIN Off-state cathode current IOFF Dynamic impedance IZKAI VKA=VREF, IKA=10mA TA=-40℃ to 105℃ Test Circuit #1 IKA=10mA ΔVKA=8V to VREF Test Circuit #2 IKA=10mA, R1=10KΩ, R2=∞ Test Circuit #2 IKA=10mA, TA=0℃ to 105℃ R1=10KΩ, R2=∞ Test Circuit #2 VKA=VREF Test Circuit #1 VKA=8V, VREF=0 Test Circuit #3 IKA=100μA-80mA VKA=VREF, f≦1KHz Test Circuit #1 68 mV 1.0 2.7 mV/V 0.15 2 μA μA 0.10 60 100 μA 0.04 0.8 μA 0.3 1.0 Ω Block Diagram Symbol Diagram VER 1.3 3 ACE432 Precision adjustable shunt voltage reference Typical Applications ACE432 Test Circuits Test Circuit 1: VKA=VREF Test Circuit 2: VKA>VREF Test Circuit 3: Off State Current Typical Performance Characteristics Cathode Current VS Cathode Voltage Cathode Voltage (V) VER 1.3 4 ACE432 Precision adjustable shunt voltage reference Reference Voltage VS Temperature (IIoad=10mA) Temperature (℃) Reference Input Current VS Temperature (R1=10K, R2=∞, IIoad=10mA) Temperature (℃) VER 1.3 5 ACE432 Precision adjustable shunt voltage reference Stability Boundry Conditions Temperature (℃) Stability Boundary Condition 150Ohm Test Circuit for VKA=VREF VER 1.3 6 ACE432 Precision adjustable shunt voltage reference 150Ω Test Circuit for VKA=2V, 3V The areas under the curves represent conditions that may cause the device to oscillate. For V KA=2V and 3V curves, R2 and VBAT were adjusted to establish the initial VKA and 1K conditions with CL=0. VBAT and CL then were adjusted to determine the ranges of stability. As the graph suggested, ACE432 is unconditional stable with IK from 0 to 100mA and with CL from 0.001uF to 1Uf. VER 1.3 7 ACE432 Precision adjustable shunt voltage reference Packing Information TO-92 VER 1.3 8 ACE432 Precision adjustable shunt voltage reference Packing Information SOT-23-3 VER 1.3 9 ACE432 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 1.3 10