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LTC2913 Datasheet(PDF) 16 Page - Linear Integrated Systems |
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LTC2913 Datasheet(HTML) 16 Page - Linear Integrated Systems |
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16 / 26 page  LT4356-1/LT4356-2 16 4356fa APPLICATIONS INFORMATION Shutdown The LT4356 can be shut down to a low current mode when the voltage at the SHDN pin goes below the shutdown threshold of 0.6V. The quiescent current drops to 7μA for the LT4356-1 and 60μA for the LT4356-2 which leaves the auxiliary amplifier on. The SHDN pin can be pulled up to VCC or below GND by up to 60V without damaging the pin. Leaving the pin open allows an internal current source to pull it up and turn on the part while clamping the pin to 2.5V. The leakage current at the pin should be limited to no more than 1μA if no pull up device is used to help turn it on. Supply Transient Protection The LT4356 is guaranteed to be safe from damage with supply voltages up to 100V. Nevertheless, voltage tran- sients above 100V may cause permanent damage. During a short-circuit condition, the large change in current flowing through power supply traces and associated wiring can cause inductive voltage transients which could exceed 100V. To minimize the voltage transients, the power trace parasitic inductance should be minimized by using wide traces. A small surge suppressor, D2, in Figure 9, at the input will clamp the voltage spikes. A total bulk capacitance of at least 22μF low ESR electro- lytic is required close to the source pin of MOSFET Q1. In addition, the bulk capacitance should be at least 10 times larger than the total ceramic bypassing capacitor on the input of the DC/DC converter. Figure 8. Overvoltage Regulator with P-Channel MOSFET Reverse Input Protection Figure 9. Overvoltage Regulator with Low-Battery Detection CTMR 0.1μF RSNS 10mΩ Q1 IRLR2908 Q2 Si4435 VIN 12V VOUT 12V, 3A CLAMPED AT 16V 4356 F08 LT4356S GND TMR 10 1 OUT SNS 3 5 SHDN 7 AOUT 11 IN+ 12 VCC 6 EN FLT FB 9 8 2 R2 4.99k R1 59k GATE 4 R6 10k D1 1N5245 15V R3 10Ω D2* SMAJ58CA *DIODES INC. CTMR 47nF *SANYO 25CE22GA R3 10Ω RSNS 10mΩ Q1 IRLR2908 D2 SMAJ58A VIN 4356 F09 LT4356S GND TMR OUT GATE SNS IN+ SHDN AOUT FAULT EN FLT UNDERVOLTAGE FB CL* 22μF DC-DC CONVERTER GND SHDN VCC R2 4.99k R4 383k R5 100k R1 59k 10 1 3 4 5 7 12 VCC 6 11 2 9 8 |
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