Datasheet LT1683 (Analog Devices) - 3

LT1683
ELECTRICAL CHARACTERISTICS The
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denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VC = 0.9V, VFB = VREF, RVSL, RCSL = 16.9k, RT = 16.9k and other pins open unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IESK Error Amp Sink Current VFB = VREF + 150mV, VC = 0.9V l 120 200 350 µA IESRC Error Amp Source Current VFB = VREF – 150mV, VC = 0.9V l 120 200 350 µA VCLH Error Amp Clamp Voltage High Clamp, VFB = 1V 1.27 V VCLL Error Amp Clamp Voltage Low Clamp, VFB = 1.5V 0.12 V AV Error Amplifier Voltage Gain 180 250 V/V FBOV FB Overvoltage Shutdown Outputs Drivers Disabled 1.47 V ISS Soft-Start Charge Current VSS = 1V 9.0 12 µA
Oscillator and Sync
fMAX Max Switch Frequency 250 kHz fSYNC Synchronization Frequency Range Oscillator Frequency = 250kHz 290 kHz VSYNC SYNC Pin Input Threshold l 0.7 1.4 2.0 RSYNC SYNC Pin Input Resistance 40 kΩ
Gate Drives (Specifications Apply to Either A or B Unless Otherwise Noted)
DCMAX Maximum Switch Duty Cycle RVSL = RCSL = 4.85k, l 45 46 % Osc Frequency = 25kHz VGON Gate On Voltage VIN = 12, GCL = 12 10 10.4 10.7 V VIN = 12, GCL = 8 7.6 7.9 8.1 V VGOFF Gate Off Voltage VIN = 12V 0.2 0.35 V IGSO Max Gate Source Current VIN = 12V 0.3 A IGSK Max Gate Sink Current VIN = 12V 0.3 A VINUVLO Gate Drive Undervoltage Lockout (Note 5) VGCL = 6.5V, Gates Enabled 7.3 7.5 V
Current Sense
tIBL Switch Current Limit Blanking Time 100 ns VSENSE Sense Voltage Shutdown Voltage VC Pulled Low l 86 103 120 mV VSENSEF Sense Voltage Fault Threshold l 230 300 mV
Slew Control (for the Following Slew Tests See Test Circuit in Figure 1b)
VSLEWR Output Voltage Slew Rising Edge RVSL = RCSL = 17k 26 V/µs VSLEWF Output Voltage Slew Falling Edge RVSL = RCSL = 17k 19 V/µs VISLEWR Output Current Slew Rising Edge (CS Pin Voltage) RVSL = RCSL = 17k 0.21 V/µs VISLEWF Output Current Slew Falling Edge (CS Pin Voltage) RVSL = RCSL = 17k 0.21 V/µs
Supply and Protection
VINMIN Minimum Input Voltage (Note 4) VGCL = VIN l 2.55 3.6 V IVIN Supply Current (Note 2) RVSL = RCSL = 17k, VIN = 12 l 25 45 mA RVSL = RCSL = 17k, VIN = 20 l 35 55 mA VSHDN Shutdown Turn-On Threshold l 1.31 1.39 1.48 V ∆VSHDN Shutdown Turn-On Voltage Hysteresis l 50 110 180 mV ISHDN Shutdown Input Current Hysteresis l 10 24 35 µA V5 5V Reference Voltage 6.5V ≤ VIN ≤ 20V, IV5 = 5mA 4.85 5 5.20 V 6.5V ≤ VIN ≤ 20V, IV5 = –5mA 4.80 5 5.15 V IV5SC 5V Reference Short-Circuit Current VIN = 6.5V Source 10 mA VIN = 6.5V Sink –10 mA 1683fd 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Test Circuits Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts