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CAT4240 Datasheet(PDF) 2 Page - Catalyst Semiconductor |
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CAT4240 Datasheet(HTML) 2 Page - Catalyst Semiconductor |
2 / 14 page CAT4240 Doc. No. MD-5026 Rev. C 2 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice ABSOLUTE MAXIMUM RATINGS Parameters Ratings Units VIN, FB voltage -0.3 to +7 V SHDN ¯¯¯¯¯ voltage -0.3 to +7 V SW voltage -0.3 to 60 V Storage Temperature Range -65 to +160 ºC Junction Temperature Range -40 to +150 ºC Lead Temperature 300 ºC RECOMMENDED OPERATING CONDITIONS Typical application circuit with external components are shown on page 1. Parameters Range Units VIN up to 5.5 V SW pin voltage 0 to 38 V Ambient Temperature Range (1) -40 to +85 ºC DC ELECTRICAL CHARACTERISTICS VIN = 3.6V, ambient temperature of 25ºC (over recommended operating conditions unless specified otherwise). Symbol Parameter Test Conditions Min Typ Max Units IQ Operating Current VFB = 0.2V VFB = 0.4V (not switching) 0.6 0.1 1.5 0.6 mA ISD Shutdown Current VSHDN ¯¯¯¯¯ = 0V 0.1 1 µA VFB FB Pin Voltage 6 LEDs with ILED = 75mA 285 300 315 mV IFB FB pin input leakage 1 µA ILED Programmed LED Current R1 = 10Ω R1 = 5Ω 28.5 30 60 31.5 mA VIH VIL SHDN ¯¯¯¯¯ Logic High SHDN ¯¯¯¯¯ Logic Low Enable Threshold Level Shutdown Threshold Level 0.4 0.8 0.7 1.5 V V FSW Switching Frequency 0.8 1.0 1.3 MHz DC Maximum Duty Cycle VIN = 3V 92 % ILIM Switch Current Limit VIN = 3.6V VIN = 5V 600 750 mA RSW Switch “On” Resistance ISW = 100mA 1.0 2.0 Ω ILEAK Switch Leakage Current Switch Off, VSW = 30V 2 5 µA Thermal Shutdown 150 ºC Thermal Hysteresis 20 ºC VUVLO Undervoltage Lockout (UVLO) Threshold 1.9 V VOV-SW Overvoltage Detection Threshold 40 V VOCL Output Voltage Clamp “Open LED” 42 V Note: (1) Thin SOT23-5 package thermal resistance θJA = 135°C/W when mounted on board over a ground plane. |
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