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LTC1159IS Datasheet(PDF) 3 Page - Linear Technology |
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LTC1159IS Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page 3 LTC1159 LTC1159-3.3/LTC1159-5 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VCC Internal Regulator Voltage VIN = 12V to 40V, EXTVCC = 0V, ICC = 10mA q 4.25 4.5 4.75 V VIN – VCC VCC Dropout Voltage VIN = 4V, EXTVCC = Open, ICC = 10mA 300 400 mV VEXT – VCC EXTVCC Switch Drop VIN = 12V, EXTVCC = 5V, ISWITCH = 10mA 250 350 mV VP-GATE – VIN P-Gate to Source Voltage (Off) VIN = 12V – 0.2 0 V VIN = 40V – 0.2 0 V VSENSE+ – Current Sense Threshold Voltage VSENSE– LTC1159 VSENSE– = 5V, VFB = 1.32V (Forced) 25 mV VSENSE– = 5V, VFB = 1.15V (Forced) q 130 150 170 mV LTC1159-3.3 VSENSE– = 3.4V (Forced) 25 mV VSENSE– = 3.1V (Forced) q 130 150 170 mV LTC1159-5 VSENSE– = 5.2V (Forced) 25 mV VSENSE– = 4.7V (Forced) q 130 150 170 mV VSNDN1 SHDN1 Threshold LTC1159CG, LTC1159-3.3, LTC1159-5 0.5 0.8 2 V VSHDN2 SHDN2 Threshold 0.8 1.4 2 V ISHDN2 Shutdown 2 Input Current VSHDN2 = 5V 12 20 µA ICT CT Pin Discharge Current VOUT in Regulation 50 70 90 µA VOUT = 0V 2 10 µA tOFF Off-Time (Note 5) CT = 390pF, ILOAD = 700mA, VIN = 10V 4 5 6 µs tr, tf Driver Output Transition Times CL = 3000pF (Pins P-Drive and N-Gate), VIN = 6V 100 200 ns SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VFB Feedback Voltage (LTC1159 Only) 1.2 1.25 1.3 V VOUT Regulated Output Voltage VIN = 9V LTC1159-3.3 ILOAD = 700mA 3.17 3.30 3.43 V LTC1159-5 ILOAD = 700mA 4.85 5.05 5.25 V IIN VIN Pin Current (Note 4) Normal VIN = 12V, EXTVCC = 5V 200 µA VIN = 40V, EXTVCC = 5V 300 µA Shutdown VIN = 12V, VSHDN2 = 2V 15 µA VIN = 40V, VSHDN2 = 2V 25 µA IEXTVCC EXTVCC Pin Current (Note 4) EXTVCC = 5V, Sleep Mode 250 µA VCC Internal Regulator Voltage VIN = 12V to 40V, EXTVCC = 0V, ICC = 10mA 4.5 V VSENSE+ – Current Sense Threshold Voltage Low Threshold (Forced) 25 mV VSENSE– High Threshold (Forced) 125 150 175 mV VSHDN2 SHDN2 Threshold 0.8 1.4 2 V tOFF Off-Time (Note 5) CT = 390pF, ILOAD = 700mA, VIN = 10V 3.5 5 6.5 µs –40 °C ≤ TA ≤ 85°C (Note 6) Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC1159CG, LTC1159CG-3.3, LTC1159CG-5: TJ = TA + (PD • 135°C/W) LTC1159CN, LTC1159CN-3.3, LTC1159CN-5: TJ = TA + (PD • 80°C/W) LTC1159CS, LTC1159CS-3.3, LTC1159CS-5: TJ = TA + (PD • 110°C/W) Note 3: On LTC1159 versions which have a SHDN1 pin, it must be at ground potential for testing. Note 4: The LTC1159 VIN and EXTVCC current measurements exclude MOSFET driver currents. When VCC power is derived from the output via EXTVCC, the input current increases by (IGATECHG • Duty Cycle)/(Efficiency). See Typical Performance Characteristics and Applications Information. Note 5: In applications where RSENSE is placed at ground potential, the off- time increases approximately 40%. ELECTRICAL C C HARA TERISTICS The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VSHDN1 = 0V (Note 3), unless otherwise noted. |
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