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LT1612 데이터시트(PDF) 3 Page - Linear Technology |
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LT1612 데이터시트(HTML) 3 Page - Linear Technology |
3 / 8 page 3 LT1612 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS SHDN Pin Current SHDN = 2V q 10 15 µA SHDN = 5V q 30 45 µA BOOST Pin Current BOOST = VIN + 2V 4 mA Switch Current Limit (Note 4) Duty Cycle = 0% MODE = OV 600 710 900 mA MODE = 5V 550 650 900 mA Burst Mode Operation Current Limit MODE = 0V 180 mA Switch Voltage Drop ISW = 500mA 200 280 mV Rectifier Voltage Drop IRECT = 500mA 300 400 mV SW Pin Leakage VSW = 5V q 1 µA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1612E is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating ELECTRICAL CHARACTERISTICS VC (Pin 1): Compensation Pin. This is the current sink/ source output of the error amplifier. By connecting an RC network from this pin to ground, frequency response can be tuned for a wide range of circuit configurations. The voltage at this pin also sets the current limit, and if grounded, the switch will remain in the OFF state. FB (Pin 2): Feedback Pin. This pin is the negative input to the error amplifier. Connect the resistor divider tap to this point which sets VOUT according to: VOUT = 0.62V (1 + R1/R2) VIN (Pin 3): Supply Pin. Bypass capacitor C1 must be right next to this pin. GND (Pin 4): Ground Pin. Connect directly to local ground plane. PIN FUNCTIONS SW (Pin 5): Switch Pin. Connect inductor and boost capacitor here. Minimize trace area at this pin to keep EMI down. BOOST (Pin 6): This is the supply pin for the switch driver and must be above VIN by 1.5V for proper switch opera- tion. Connect the boost capacitor to this pin. MODE (Pin 7): Burst Mode Operation Disable Pin. For continuous switching operation (low noise), pull this pin above 2V. For Burst Mode operation which gives better light load efficiency, tie to ground. Output ripple voltage in Burst Mode operation is typically 30mVP-P. See applica- tions section for more information about this function. SHDN (Pin 8): Shutdown Pin. Pull this pin low for shut- down mode. Tie to a voltage between 2V and 5.5V for normal operation. The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C, VIN = VSHDN = 3V temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Bias current flows out of the FB pin. Note 4: Duty cycle affects current limit due to slope compensation. |
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