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LT1175IT-5-TR Datasheet(PDF) 5 Page - Linear Technology |
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LT1175IT-5-TR Datasheet(HTML) 5 Page - Linear Technology |
5 / 18 page LT1175 1175fe Typical perForMance characTerisTics Typical Current Limit Characteristics Guaranteed Current Limit Output Voltage Temperature Drift Minimum Input-to-Output Voltage Minimum Input-to-Output Voltage SENSE Bias Current (Adjustable Part) elecTrical characTerisTics Note 8: Thermal regulation is a change in the output voltage caused by die temperature gradients, so it is proportional to chip power dissipation. Temperature gradients reach final value in less than 100ms. Output voltage changes after 100ms are due to absolute die temperature changes and reference voltage temperature coefficient. Note 9: The lower limit of 0.8V is guaranteed to keep the regulator in shutdown. The upper limit of 2.5V is guaranteed to keep the regulator active. Either polarity may be used, referenced to GND pin. Note 10: Load and line regulation are measured on a pulse basis with pulse width of 20ms or less to keep chip temperature constant. DC regulation will be affected by thermal regulation (Note 8) and chip temperature changes. Load regulation specification also holds for currents up to the specified current limit when ILIM2 or ILIM4 are left open. Note 11: Current limit is reduced for input-to-output voltage above 12V. See the graph in Typical Performance Characteristics for guaranteed limits above 12V. Note 12: Operating at very large input-to-output differential voltages (>15V) with load currents less than 5mA requires an output capacitor with an ESR greater than 1Ω to prevent low level output oscillations. INPUT-TO-OUTPUT DIFFERENTIAL VOLTAGE (V) 0 1.0 0.8 0.6 0.4 0.2 0 20 1175 G01 5 10 15 25 ILIM2, ILIM4 TIED TO VIN ILIM2, ILIM4 OPEN ILIM4 TIED TO VIN ILIM2 TIED TO VIN CURRENT LIMIT CHANGES ONLY SLIGHTLY WITH TEMPERATURE SO CURVES ARE REPRESENTATIVE OF ALL TEMPERATURES INPUT-TO-OUTPUT DIFFERENTIAL VOLTAGE (V) 0 0.6 0.5 0.4 0.3 0.2 0.1 0 5 10 15 20 1175 G02 25 CURVES REPRE- SENT MINIMUM GUARANTEED LIMITS AT ALL TEMPERATURES ILIM2, ILIM4 OPEN ILIM4 TIED TO VIN ILIM2 TIED TO VIN ILIM2, ILIM4 TIED TO VIN JUNCTION TEMPERATURE (°C) –50 5.05 5.00 4.95 3.84 3.80 3.76 0 50 75 1175 G03 –25 25 100 125 OUTPUT FIXED 5V PART FEEDBACK VOLTAGE ADJUSTABLE PART OUTPUT CURRENT (A) 0 1.0 0.8 0.6 0.4 0.2 0 0.2 0.4 0.5 1175 G04 0.1 0.3 0.6 0.7 TJ = 25°C VIN REDUCED UNTIL OUTPUT VOLTAGE DROPS 1% ILIM2, ILIM4 OPEN ILIM2, ILIM4 TIED TO VIN ILIM4 TIED TO VIN ILIM2 TIED TO VIN OUTPUT CURRENT (A) 0 1.0 0.8 0.6 0.4 0.2 0 0.2 0.4 0.5 1175 G05 0.1 0.3 0.6 0.7 VIN REDUCED UNTIL OUTPUT VOLTAGE DROPS 1%. ILIM2, ILIM4 TIED TO VIN TJ = 125°C TJ = –55°C TJ = 25°C TEMPERATURE (°C) –50 100 80 60 40 20 0 0 50 75 1175 G06 –25 25 100 125 |
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