ACE432A

ACE432A Technology Description The ACE432 series ICs are low voltage three-terminal adjustable regulators with guaranteed thermal stability over a full operation range. These ICs feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for Zener diodes in applications such as switching power supply, charger, motherboard and other adjustable regulators. The output voltage can be set to any value between 1.24V and 18V with two external resistors. The ACE432 precision reference is offered in two voltage tolerance: 0.5% and 1.0%. These ICs are available SOT-23-3. Precision adjustable shunt voltage reference Features • • • • • • • • • • • • • Wide Programmable Precise Output Voltage from 1.24V to 18V High Stability under Capacitive Load Low Temperature Deviation: 3mV Typical Low Equivalent Full-range Temperature Coefficient: 20PPM/℃ Typical Low Dynamic Output Resistance: 0.05Ω Typical High Sink Current Capacity from 0.1mA to 100mA Low Output Noise Wide Operating Range of -40 to 125℃ Application Graphic Card PC Motherboard Voltage Adapter Switching Power Supply Charger Absolute Maximum Ratings Parameter Cathode to Anode Voltage (Note 2) Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation Junction Temperature Storage temperature range Symbol VKA IKA IREF PD TJ TSTG Max Unit 20 V -100 to 100 mA 10 370 150 - 65 to 150 mA mW O O C C Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. VER 1.2 1 ACE432A Technology Packaging Type SOT-23-3 3 Precision adjustable shunt voltage reference Pin SOT-23 Cathode 2 Anode 3 Ref 1 1 2 Ordering information Selection Guide ACE432 X XX E + H Halogen - free Pb - free Temperature Range : -40 to 125℃ BM : SOT-23-3 Reference Voltage accuracy : A : 0.5% B : 1% Functional Block Diagram Figure 1. Functional Block Diagram of ACE432 VER 1.2 2 ACE432A Technology Recommended Operating Conditions Parameter Symbol Min Max Unit Cathode Voltage VKA VREF 18 V Cathode Current IKA 0.1 100 mA Operating Ambient Temperature Range -40 125 ℃ Precision adjustable shunt voltage reference Electrical Characteristics Operating Conditions: TA=25℃, unless otherwise note Parameter Reference Voltage 0.5% 1.0% Symbol VREF Test Conditions VKA=VREF, IKA=10mA 0 to 70℃ -40 to 85℃ -40 to 125℃ Min. Typ. Max. 1.234 1.240 1.246 1.228 1.240 1.252 2 3 4 -0.5 0.15 0.10 55 0.04 0.01 0.05 84.84 10 10 15 -1.5 0.40 0.40 80 0.10 0.05 0.15 Unit V Deviation of reference voltage over full temperature range △VREF VKA=VREF, IKA=10mA mV Ratio of change in VREF to the change in cathode voltage Reference Input current Deviation of Reference current over full temperature range Minimum cathode current for regulation Off-state cathode current Dynamic impedance Thermal Resistance ΔVREF/ΔKA IREF △IREF IKA (Min) I KA (Off) ZKA θJC IKA=10mA ΔVKA : VREF to 16V IKA=10mA, R1=10KΩ, R2=∞ IKA=10mA, R1=10KΩ, R2=∞TA=-40℃ to 125℃ VKA=VREF VREF=0, VKA=18V VKA=6, VREF=0 IKA=1 to 100mA VKA=VREF, f≦1kHz SOT-23 mV/V μA μA μA μA Ω ℃/W VER 1.2 3 ACE432A Technology Electrical Characteristics Precision adjustable shunt voltage reference Figure 2. Test Circuit 4 for VKA=VREF Figure 3. Test Circuit 5 for VKA>VREF Figure 4. Test Circuit 6 for IOFF VER 1.2 4 ACE432A Technology Typical Performance Characteristics Precision adjustable shunt voltage reference Ambient Temperature (℃) Figure 5. Reference Voltage vs. Ambient Temperature Ambient Temperature (℃) Figure 6. Reference Current vs. Ambient Temperature Cathode Voltage (V) Figure 7. Cathode Current vs. Cathode Voltage Cathode Voltage (V) Figure 8. Cathode Current vs. Cathode Voltage Small Signal Frequency (Hz) Figure 9. Small Signal Voltage Gain vs. Frequency VER 1.2 5 ACE432A Technology Precision adjustable shunt voltage reference Frequency (Hz) Figure 10. Dynamic Impedance vs. Frequency Time (μs) Figure 11. Pulse Response of Input and Output Voltage Ambient Temperature (℃) Figure 12. Ratio of Delta Reference Voltage to the Ratio of Cathode Voltage vs. Ambient Temperature VER 1.2 6 ACE432A Technology Typical Applications Precision adjustable shunt voltage reference ACE432 Figure 13. Shunt Regulator ACE432 Figure 14. High Current Shunt Regulator ACE432 Figure 15. Current Source or Current Limit VER 1.2 7 ACE432A Technology ACE1117 Precision adjustable shunt voltage reference ACE432 Figure 15. Current Source or Current Limit Figure 17. PWM Converter with Reference VER 1.2 8 ACE432A Technology Packing Information SOT-23-3 Precision adjustable shunt voltage reference VER 1.2 9 ACE432A Technology 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 1.2 10