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LT1308BCS8-TRPBF Datasheet(PDF) 4 Page - Linear Technology |
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LT1308BCS8-TRPBF Datasheet(HTML) 4 Page - Linear Technology |
4 / 20 page 4 LT1308A/LT1308B 1308abfa TYPICAL PERFORMANCE CHARACTERISTICS LT1308B 3.3V Output Efficiency LT1308A 5V Output Efficiency LT1308A 3.3V Output Efficiency Note 4: Switch current limit guaranteed by design and/or correlation to static tests. Duty cycle affects current limit due to ramp generator (see Block Diagram). Note 5: Bias current flows out of LBI pin. Note 6: Connect the four GND pins (Pins 4–7) together at the device. Similarly, connect the three SW pins (Pins 8–10) together and the two VIN pins (Pins 11, 12) together at the device. Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT1308ACS8, LT1308ACF, LT1308BCS8 and LT1308BCF are designed, characterized and expected to meet the industrial temperature limits, but are not tested at – 40 °C and 85°C. I grade devices are guaranteed over the –40 °C to 85°C operating temperature range. Note 3: Bias current flows into FB pin. LOAD CURRENT (mA) 95 90 85 80 75 70 65 60 55 50 1 100 1000 1308A/B G01 10 VIN = 1.8V VIN = 2.5V VIN = 1.2V LOAD CURRENT (mA) 95 90 85 80 75 70 65 60 55 50 1 100 1000 1308A/B G02 10 VIN = 1.8V VIN = 2.5V VIN = 1.2V LOAD CURRENT (mA) 1 95 90 85 80 75 70 65 60 55 50 10 100 1000 1308A/B G03 VIN = 4.2V VIN = 2.5V VIN = 3.6V VIN = 1.5V ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. Industrial Grade – 40°C to 85°C. VIN = 1.2V, VSHDN = VIN, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS fOSC Switching Frequency ● 500 600 750 kHz Maximum Duty Cycle ● 82 90 % Switch Current Limit Duty Cyle = 30% (Note 4) 2 3 4.5 A Switch VCESAT ISW = 2A (25°C, – 40°C), VIN = 1.5V 290 350 mV ISW = 2A (85°C), VIN = 1.5V 330 400 mV Burst Mode Operation Switch Current Limit VIN = 2.5V, Circuit of Figure 1 400 mA (LT1308A) Shutdown Pin Current VSHDN = 1.1V ● 2 5 μA VSHDN = 6V ● 20 35 μA VSHDN = 0V 0.01 0.1 μA LBI Threshold Voltage 196 200 204 mV ● 193 200 207 mV LBO Output Low ISINK = 50μA ● 0.1 0.25 V LBO Leakage Current VLBI = 250mV, VLBO = 5V ● 0.01 0.1 μA LBI Input Bias Current (Note 5) VLBI = 150mV 33 100 nA Low-Battery Detector Gain 3000 V/V Switch Leakage Current VSW = 5V ● 0.01 10 μA |
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