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LT1460HCS3-10-TRMPBF Datasheet(PDF) 15 Page - Linear Technology |
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LT1460HCS3-10-TRMPBF Datasheet(HTML) 15 Page - Linear Technology |
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15 / 26 page  LT1460 1460fc Longer Battery Life Series references have a large advantage over older shunt style references. Shunt references require a resistor from the power supply to operate. This resistor must be chosen tosupplythemaximumcurrentthatcaneverbedemanded by the circuit being regulated. When the circuit being controlled is not operating at this maximum current, the shunt reference must always sink this current, resulting in high dissipation and short battery life. The LT1460 series reference does not require a current set- ting resistor and can operate with any supply voltage from VOUT +0.9Vto20V.Whenthecircuitrybeingregulateddoes not demand current, the LT1460 reduces its dissipation and battery life is extended. If the reference is not delivering load current it dissipates only a few mW, yet the same configura- tion can deliver 20mA of load current when demanded. Capacitive Loads The LT1460 is designed to be stable with capacitive loads. With no capacitive load, the reference is ideal for fast set- tling, applications where PC board space is a premium, or where available capacitance is limited. The test circuit for the LT1460-2.5 shown in Figure 1 is used to measure the response time for various load cur- rents and load capacitors. The 1V step from 2.5V to 1.5V produces a current step of 1mA or 100µA for RL = 1k or RL = 10k. Figure 2 shows the response of the reference with no load capacitance. The reference settles to 2.5mV (0.1%) in less than 1µs for a 100µA pulse and to 0.1% in 1.5µs with a 1mA step. When load capacitance is greater than 0.01µF, the refer- ence begins to ring due to the pole formed with the output impedance. Figure 3 shows the response of the reference to a 1mA and 100µA load current step with a 0.01µF load capacitor. The ringing can be greatly reduced with a DC loadassmallas200µA.Withlargeoutputcapacitors,≥1µF, Figure 5. Effect of RS for CL = 1µF Figure 1. Response Time Test Circuit Figure 2. CL = 0 Figure 3. CL = 0.01µF Figure 4. Isolation Resistor Test Circuit LT1460-2.5 RL VOUT VGEN 1460 F01 CIN 0.1µF 2.5V 1.5V CL VIN = 5V LT1460-2.5 RL VGEN 1460 F04 CIN 0.1µF 2.5V 1.5V CL VIN = 5V VOUT RS 1µs/DIV 2.5V 1.5V RL = 10k RL = 1k 1460 F02 VGEN VOUT VOUT 20µs/DIV VGEN VOUT VOUT 2.5V 1.5V RL = 10k RL = 1k 1460 F03 0.1ms/DIV 2.5V 1.5V RL = 1k RS = 0 RL = 1k RS = 2 1460 F05 VGEN VOUT VOUT the ringing can be reduced with a small resistor in series with the reference output as shown in Figure 4. Figure 5 shows the response of the LT1460-2.5 with a RS = 2Ω and applications inForMation |
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