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LTC1872B 数据表(PDF) 2 Page - Linear Technology |
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LTC1872B 数据表(HTML) 2 Page - Linear Technology |
2 / 12 page 2 LTC1872B ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply Voltage (VIN).........................– 0.3V to 10V SENSE –, NGATE Voltages ............ – 0.3V to (VIN + 0.3V) VFB, ITH/RUN Voltages ..............................–0.3V to 2.4V NGATE Peak Output Current (< 10 µs) ....................... 1A Storage Ambient Temperature Range ... – 65 °C to 150°C Operating Temperature Range (Note 2) .. – 40 °C to 85°C Junction Temperature (Note 3) ............................. 150 °C Lead Temperature (Soldering, 10 sec).................. 300 °C PACKAGE/ORDER INFORMATION TJMAX = 150°C, θJA = 230°C/ W S6 PART MARKING ORDER PART NUMBER LTC1872BES6 LTXY Consult LTC marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The q denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise specified. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Input DC Supply Current Typicals at VIN = 4.2V (Note 4) Normal Operation 2.4V ≤ VIN ≤ 9.8V 270 420 µA Sleep Mode 2.4V ≤ VIN ≤ 9.8V 230 370 µA Shutdown 2.4V ≤ VIN ≤ 9.8V, VITH/RUN = 0V 8 22 µA UVLO VIN < UVLO Threshold 6 10 µA Undervoltage Lockout Threshold VIN Falling q 1.55 2.00 2.35 V VIN Rising 1.85 2.10 2.40 V Shutdown Threshold (at ITH/RUN) q 0.15 0.35 0.55 V Start-Up Current Source VITH/RUN = 0V 0.25 0.5 0.85 µA Regulated Feedback Voltage 0 °C to 70°C(Note 5) q 0.780 0.800 0.820 V –40 °C to 85°C(Note 5) q 0.770 0.800 0.830 V VFB Input Current (Note 5) 10 50 nA Oscillator Frequency VFB = 0.8V 500 550 650 kHz Gate Drive Rise Time CLOAD = 3000pF 40 ns Gate Drive Fall Time CLOAD = 3000pF 40 ns Peak Current Sense Voltage (Note 6) 114 120 mV ITH/RUN 1 GND 2 VFB 3 6 NGATE 5 VIN 4 SENSE– TOP VIEW S6 PACKAGE 6-LEAD PLASTIC SOT-23 Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1872BE is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA°C/W) Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 5: The LTC1872B is tested in a feedback loop that servos VFB to the output of the error amplifier. Note 6: Guaranteed by design at duty cycle = 30%. Peak current sense voltage is VREF/6.67 at duty cycle <40%, and decreases as duty cycle increases due to slope compensation as shown in Figure 3. |
类似零件编号 - LTC1872B |
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类似说明 - LTC1872B |
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