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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: 0.05 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
VREF/KA IREF IREF IKA (Min) I KA (Off) ZKA JC
IKA=10mA VKA : VREF to 16V IKA=10mA, R1=10K, R2= IKA=10mA, R1=10K, R2=TA=-40 to 125 VKA=VREF VREF=0, VKA=18V VKA=6, VREF=0 IKA=1 to 100mA VKA=VREF, f1kHz SOT-23
mV/V A A A A /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 (s)
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

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