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LT1500CS-5 Datasheet(PDF) 4 Page - Linear Technology |
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LT1500CS-5 Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page 4 LT1500/LT1501 ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temperature range. Note 1: Feedback pin or output is held sightly above the regulated value to force the VC node low and switching to stop. Note 2: See Typical Performance Characteristics for graph of Guaranteed Switch Voltage vs Saturation Voltage. Note 3: Peak switch current is the guaranteed minimum value of switch current available in normal operation. Highest calculated switch current at full load should not exceed the minimum value shown. Note 4: Loading on FB pin will affect NFB reference voltage. ∆VNFB = IFB/gm. Do not exceed 10 µA loading on FB when NFB is being used. Note 5: This is the delay between sense pin current reaching its upper or lower threshold and switch transition. Switch delay times cause peak-to- peak inductor current to increase and therefore switching frequency to be low. This effect will be significant for frequencies above 100kHz. See Application Information and Typical Performance Characteristics. Note 6: Reference voltage under all conditions includes VIN = 2.1V to 15V, all loads and full temperature range. Note 7: As with all boost regulators the output voltage of the LT1500 cannot fall to less than input voltage because of the path through the catch diode. This means that the output voltage divider on adjustable parts will still be generating feedback voltage at the FB pin (fixed voltage parts have an internal switch to disconnect the divider in shutdown). If the voltage on FB is greater than 0.6V in shutdown, the internal error amplifier will draw current that adds to shutdown current. See graph of Shutdown Current vs FB voltage in Typical Performance Characteristics. TYPICAL PERFORMANCE CHARACTERISTICS Switching Frequency (3.3V Output) LOAD CURRENT (mA) 0 50 100 10 100 1000 150 200 250 300 LTC1500/01 • TPC20 10 µH 20 µH 50 µH 100 µH BURST REGION VIN = 2.3V Switching Frequency (5V Output) LOAD CURRENT (mA) 0 50 100 10 100 1000 150 200 250 300 LTC1500/01 • TPC21 10 µH 20 µH 50 µH 100 µH BURST REGION VIN = 3V Switching Frequency (12V Output) LOAD CURRENT (mA) 025 50 75 1000 100 10 100 125 150 175 200 LTC1500/01 • TPC22 10 µH 50 µH 20 µH 100 µH BURST REGION VIN = 5V Efficiency (3.3V Output) LOAD CURRENT (mA) 1 100 90 80 70 60 50 40 30 10 100 1000 LTC1500/01 • TPC17 TJ = 25°C VIN = 2.3V LOW LOSS INDUCTOR L = 100 µH L = 10 µH L = 33 µH Efficiency (5V Output) LOAD CURRENT (mA) 1 100 90 80 70 60 50 40 30 10 100 1000 LTC1500/01 • TPC18 VIN = 3V LOW LOSS INDUCTOR L = 100 µH L = 10 µH L = 33 µH Efficiency (12V Output) LOAD CURRENT (mA) 1 100 90 80 70 60 50 40 30 10 100 1000 LTC1500/01 • TPC19 VIN = 5V LOW LOSS INDUCTOR L = 100 µH L = 10 µH L = 33 µH |
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Similar Description - LT1500CS-5 |
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