LTC4125 e lecTrical characTerisTics The l denotes the specifications which apply over the specified operatingjunction temperature range, otherwise specifications are at TA = 25°C. VIN = VIN1 = VIN2 = 5V unless otherwise noted (Notes 2, 3). SYMBOL PARAMETERCONDITIONSMINTYPMAXUNITS Input Supply Operating Range VIN = VIN1 = VIN2 l 3 5.5 V Input Supply Quiescent Current SW1 and SW2 Open At IN pin 1 2 mA At IN1, IN2 pin EN = 5V 50 150 μA Enable Pin EN Leakage Current VEN = 5V l 0.2 0.5 1.2 μA EN Falling Threshold VEN Falling 1.20 V EN Hysteresis 16 mV Search Delay Oscillator Pins ICTS,PU CTS Pull-Up Current VCTS = 0V –10 µA ICTS,PD CTS Pull-Down Current VCTS = 2V 10 µA CTS Pin Frequency CCTS = 4.7nF 1.0 1.7 2.4 kHz CTS Threshold for AutoResonant Disable l 1.8 2.3 2.8 V ICTD,PU CTD Pull-Up Current VCTD = 0V –10 µA ICTD,PD CTD Pull-Down Current VCTD = 2V 10 µA CTD Pin Frequency CCTD = 470pF 10 17 24 kHz Resonant Driver and Pulse Width Modulator Operating Frequency Range 50 250 kHz RA,B,C,D Switch On Resistances MOSFETs A, B, C and D (Block Diagram) 150 mΩ Switch Pins Minimum On Time SW1, SW2 150 ns Minimum PTH Voltage for Switching 35 mV PTH Voltage to Pulse Width Gain normalized to SW1 On Time • fn / ∆VPTH1, 0.24 V–1 the LC natural frequency (fn) SW2 On Time • fn / ∆VPTH2 PTH Pull Up Current when Overdriving VPTH1 = VPTH2 = 0V l –20 –10 –5 μA PTH Pull Down Current when Overdriving VPTH1 = VPTH2 = 5V l 10 20 40 μA Auto Load Detection VPTH Step Size during Auto Load Detection 75 mV Search Delay Time between Optimum Point Search CCTD = 470pF 3.7 s Optimum Point Search Duration CCTS = 470pF (Figure 13) 40 ms FB Pin Leakage Current VFB = 5V l 0.2 0.5 1.2 μA FB Over-Range Rising Threshold VFB Rising l VIN – 0.04 VIN VIN + 0.04 V FB Over-Range Threshold Hysteresis 40 mV PTHM Pin Leakage Current VPTHM = 5V l 0.2 0.5 1.2 μA PTHM Pin Common Mode Voltage Range 0 5 V FTH Pin Leakage Current VFTH = 0V l –1.2 –0.5 –0.2 μA FTH Voltage to Frequency Gain 64 kHz/V DTH Pin Leakage Current VDTH = 0V l –1.2 –0.5 –0.2 μA 4125f For more information www.linear.com/LTC4125 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
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