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LT1376HVIS Datasheet(PDF) 6 Page - Linear Technology |
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LT1376HVIS Datasheet(HTML) 6 Page - Linear Technology |
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6 / 28 page  6 LT1375/LT1376 TYPICAL PERFORMANCE CHARACTERISTICS INPUT VOLTAGE (V) 0 1.50 1.25 1.00 0.75 0.50 0.25 0 510 15 20 1375/76 G13 25 L = 20 µH L = 10 µH L = 5 µH VOUT = 10V INPUT VOLTAGE (V) 0 1.50 1.25 1.00 0.75 0.50 0.25 0 510 15 20 1375/76 G14 25 L = 20 µH L = 10 µH L = 5 µH VOUT = 3.3V Maximum Load Current at VOUT = 10V Maximum Load Current at VOUT = 3.3V Maximum Load Current at VOUT = 5V INPUT VOLTAGE (V) 0 1.50 1.25 1.00 0.75 0.50 0.25 0 510 15 20 1375/76 G15 25 L = 20 µH L = 10 µH L = 5 µH VOUT = 5V PIN FUNCTIONS BOOST: The BOOST pin is used to provide a drive voltage, higher than the input voltage, to the internal bipolar NPN power switch. Without this added voltage, the typical switch voltage loss would be about 1.5V. The additional boost voltage allows the switch to saturate and voltage loss approximates that of a 0.3 Ω FET structure, but with much smaller die area. Efficiency improves from 75% for conventional bipolar designs to > 87% for these new parts. VSW: The switch pin is the emitter of the on-chip power NPN switch. It is driven up to the input pin voltage during switch on time. Inductor current drives the switch pin negative during switch off time. Negative voltage is clamped with the external catch diode. Maximum negative switch voltage allowed is – 0.8V. SHDN: The shutdown pin is used to turn off the regulator and to reduce input drain current to a few microamperes. Actually, this pin has two separate thresholds, one at 2.38V to disable switching, and a second at 0.4V to force complete micropower shutdown. The 2.38V threshold functions as an accurate undervoltage lockout (UVLO). This is sometimes used to prevent the regulator from operating until the input voltage has reached a predeter- mined level. SWITCH CURRENT (A) 0 12 10 8 6 4 2 0 0.25 0.50 0.75 1.00 1375/76 G16 1.25 TJ = 25°C BOOST Pin Current VC Pin Shutdown Threshold SWITCH CURRENT (A) 0 0.8 0.6 0.4 0.2 0 0.25 0.50 0.75 1.00 1375/76 G18 1.25 1.50 TJ = 25°C Switch Voltage Drop JUNCTION TEMPERATURE ( °C) –50 1.4 1.2 1.0 0.8 0.6 0.4 100 1375/76 G11 –25 0 25 50 75 125 SHUTDOWN |
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