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FAN5343UMPX Fiches technique(PDF) 5 Page - Fairchild Semiconductor |
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FAN5343UMPX Fiches technique(HTML) 5 Page - Fairchild Semiconductor |
5 / 11 page © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5343 • Rev. 1.0.4 5 Electrical Specifications VIN = 2.7V to 5.5V and TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = 25°C and VIN = 3.6V. Symbol Parameter Conditions Min. Typ. Max. Units Power Supplies ISD Shutdown Supply Current EN = GND, VIN = 3.6V 0.30 0.75 μA VUVLO Under-Voltage Lockout Threshold VIN Rising 2.10 2.35 2.60 V VIN Falling 1.90 2.15 2.40 V VUVHYST Under-Voltage Lockout Hysteresis 250 mV EN: Enable Pin VIH HIGH-Level Input Voltage 1.2 V VIL LOW-Level Input Voltage 0.4 V REN EN Pull-Down Resistance 200 300 400 k Ω tLO EN Low Time for Dimming VIN = 3.6V; See Figure 14 0.5 300.0 µs tHI Time Delay Between Steps VIN = 3.6V; See Figure 14 0.5 µs TSD EN Low, Shutdown Pulse Width VIN = 3.6V; from Falling Edge of EN 1 ms Feedback and Reference VFB Feedback Voltage ILED = 20mA from -40°C to +85°C, 2.7V ≤ VIN ≤ 5.5V 237 250 263 mV IFB Feedback Input Current VFB = 250mV 0.1 1.0 μA Power Outputs RDS(ON)_Q1 Boost Switch On-Resistance VIN = 3.6V, ISW = 100mA 600 m Ω VIN = 2.7V, ISW = 100mA 650 ISW(OFF) SW Node Leakage (2) EN = 0, VIN = VSW = VOUT = 5.5V, VLED = 0 0.1 2.0 μA ILIM-PK Boost Switch Peak Current Limit VIN = 3.6V 750 mA Oscillator fSW Boost Regulator Switching Frequency 1.0 1.2 1.4 MHz Output and Protection VOVP Boost Output Over-Voltage Protection 22.5 24.5 V OVP Hysteresis 1.0 VTLSC VOUT Short Circuit Detection Threshold VOUT Falling VIN – 1.4 V VTHSC VOUT Short Circuit Detection Threshold VOUT Rising VIN – 1.2 V DMAX Maximum Boost Duty Cycle (3,4) 85 % DMIN Minimum Boost Duty Cycle (3,4) 20 % TTSD Thermal Shutdown 150 °C THYS Thermal Shutdown Hysteresis 35 °C Notes: 2. SW leakage current includes the leakage current of two internal switches; SW to GND and SW to VOUT. 3. Not tested in production, but guaranteed by design 4. Application should guarantee that minimum and maximum duty cycle fall between 20-85% to meet the specified range. |
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