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LTC1174IS8 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1174IS8 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page 3 LTC1174 LTC1174-3.3/LTC1174-5 ELECTRICAL C C HARA TERISTICS TA = 25°C, VIN = 9V, VSHUTDOWN = VIN, IPGM = 0V, unless otherwise noted. –40 °C ≤ TA ≤ 85°C (Note 6), for LTC1174I only. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VFB Feedback Voltage LTC1174I 1.18 1.25 1.31 V ILBOUT Current Sunk by Pin 2 VLBOUT = 0.4 0.75 1.2 2 mA IPEAK Current Limit IPGM = VIN, VOUT = 0V 0.54 0.60 0.78 A IPGM = 0V, VOUT = 0V 0.34 A tOFF Switch Off-Time (Note 5) VOUT at Regulated Value 2 4 6 µs The q denotes specifications which apply over the full operating temperature range. Note 1: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC1174CN8, LTC1174CN8-3.3, LTC1174CN8-5: TJ = TA + (PD × 110°C/W) LTC1174CS8, LTC1174CS8-3.3, LTC1174CS8-5: TJ = TA + (PD × 150°C/W) Note 2: Guaranteed by design. Note 3: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 4: Current into pin 6 only, measured without electrolytic input capacitor. Note 5: The off-time is wafer-sort trimmed. Note 6: The LTC1174I is not tested and not quality assurance sampled at –40 °C and 85°C. These specifications are guaranteed by design and/or correlation. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IQ Input DC Supply Current (Note 3) Active Mode LTC1174: 4V < VIN < 12V, IPGM = 0V 450 600 µA LTC1174HV: 4V < VIN < 16V, IPGM = 0V 450 600 µA Sleep Mode LTC1174: 4V < VIN < 12V 130 180 µA LTC1174HV: 4V < VIN < 16V 130 180 µA SHUTDOWN (Note 4) LTC1174: VSHUTDOWN = 0V, 4V < VIN < 12V 1 10 µA LTC1174HV: VSHUTDOWN = 0V, 4V < VIN < 16V 2 25 µA VLBTRIP Low-Battery Trip Point 1.25 1.4 V ILBIN Current into Pin 3 0.5 µA ILBOUT Current Sunk by Pin 2 LTC1174: VLBOUT = 0.4V 1.0 1.2 1.5 mA LTC1174HV: VLBOUT = 0.4V 0.6 0.8 1.5 mA VHYST Comparator Hysteresis LTC1174/LTC1174HV 7.5 15 30 mV IPEAK Current Limit IPGM = VIN, VOUT = 0V q 0.54 0.60 0.78 A IPGM = 0V, VOUT = 0V q 0.27 0.34 0.50 A RON ON Resistance of Switch LTC1174 q 0.75 1.30 Ω LTC1174HV q 0.90 1.55 Ω tOFF Switch Off-Time (Note 5) VOUT at Regulated Value 3 4 5 µs VIH SHUTDOWN Pin High Minimum Voltage at Pin 8 for Device to Be Active 1.2 V VIL SHUTDOWN Pin Low Maximum Voltage at Pin 8 for Device to Be in Shutdown 0.75 V IIH SHUTDOWN Pin Input Current LTC1174: VSHUTDOWN = 12V 0.5 µA LTC1174HV: VSHUTDOWN = 16V 2.0 IIL SHUTDOWN Pin Input Current 0 ≤ VSHUTDOWN ≤ 0.8V 0.5 µA |
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