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LTC1911-1.8 Datasheet(PDF) 4 Page - Linear Technology |
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LTC1911-1.8 Datasheet(HTML) 4 Page - Linear Technology |
4 / 12 page 4 LTC1911-1.5/LTC1911-1.8 1911f TYPICAL PERFOR A CE CHARACTERISTICS Start-Up Time vs Soft-Start Capacitor Output Ripple vs Output Load Current Output Current Transient Response Line Transient Response SOFT-START CAPACITOR (nF) 0.1 0.1 1 10 100 110 1911 G10 100 TA = –40°C TA = 25°C TA = 85°C VIN = 3.6V 4V 3V VIN 500mV/DIV VOUT 20mV/DIV IOUT = 225mA 20 µs/DIV 1911 G14 250mA 25mA IOUT VOUT 20mV/DIV VIN = 3.6V 10 µs/DIV 1911 G13 VIN (Pin 1): Input Supply Voltage. VIN may be between 2.7V and 5.5V. Suggested bypass for VIN is a 10µF (1µF min) ceramic low ESR capacitor. C2+ (Pin 2): Flying Capacitor Two Positive Terminal. C2 – (Pin 3): Flying Capacitor Two Negative Terminal. GND (Pin 4): Ground. Connect to a ground plane for best performance. C1– (Pin 5): Flying Capacitor One Negative Terminal. VOUT (Pin 6): Regulated Output Voltage. VOUT is discon- nected from VIN during shutdown. Bypass VOUT with a ≥10µF ceramic low ESR capacitor (4µF min, ESR < 0.1Ω max). C1+ (Pin 7): Flying Capacitor One Positive Terminal. PI FU CTIO S SS/SHDN (Pin 8): Soft-Start/Shutdown Control Pin. This pin is designed to be driven with an external open-drain output. Holding the SS/SHDN pin below 0.3V will force the LTC1911-X into shutdown mode. An internal pull-up current of 2 µA will force the SS/SHDN voltage to climb to VIN once the device driving the pin is forced into a Hi-Z state. To limit inrush current on start-up, connect a capacitor between the SS/SHDN pin and GND. Capaci- tance on the SS/SHDN pin will limit the dV/dt of the pin during turn on which, in turn, will limit the dV/dt of VOUT. By selecting an appropriate soft-start capacitor, the user can control the inrush current for a known output capaci- tor during turn-on (see Application Information). If nei- ther of the two functions are desired, the pin may be left floating or tied to VIN. LTC1911-1.8 Output Voltage Ripple VOUT 50mV/DIV 2-TO-1 MODE VIN = 5V IOUT = 250mA 100ns/DIV 1911 G12 ALL WAVEFORMS AC COUPLED OUTPUT LOAD CURRENT (mA) 0 0 5 10 15 20 30 50 100 150 200 1911 G11 250 300 25 COUT = 4.7µF COUT = 10µF COUT = 22µF VOUT 50mV/DIV 3-TO-2 MODE VIN = 3.6V VOUT 50mV/DIV 1-TO-1 MODE VIN = 2.7V VIN (V) 2.5 1.40 1.45 1.50 1.55 1.60 3.0 3.5 4.0 4.5 1911 G15 5.0 5.5 TA = –40°C TA = 25°C TA = 85°C Oscillator Frequency vs Input Supply Voltage |
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