Datasheet LTC3722-1, LTC3722-2 (Analog Devices) - 4

LTC3722-1/LTC3722-2
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VCC = 9.5V, CT = 270pF, RDPRG = 60.4k, RSPRG = 100k, unless otherwise noted (Note 6). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Reference
VREF Initial Accuracy TA = 25°C, Measured on VREF 4.925 5.00 5.075 V REFLD Load Regulation Load on VREF = 100µA to 5mA 2 15 mV REFLN Line Regulation VCC = 6.5V to 9.5V 0.9 10 mV REFTV Total Variation Line, Load l 4.900 5.000 5.100 V REFSC Short-Circuit Current VREF Shorted to GND 18 30 45 mA
Outputs
OUTH(x) Output High Voltage IOUT(x) = –50mA 7.9 8.4 V OUTL(x) Output Low Voltage IOUT(x) = 50mA 0.6 1 V RHI(x) Pull-Up Resistance IOUT(x) = –50mA to –10mA 22 30 Ω RLO(x) Pull-Down Resistance IOUT(x) = –50mA to –10mA 12 20 Ω tr(x) Rise Time COUT(x) = 50pF (Note 8) 5 15 ns tf(x) Fall Time COUT(x) = 50pF (Note 8) 5 15 ns SDEL SYNC Driver Turn-0ff Delay RSPRG = 100k 180 ns
Current Limit and Shutdown
CLPP Pulse by Pulse Current Limit Threshold Measured on CS LTC3722E-1/LTC3722I-1/LTC3722E-2/LTC3722I-2 270 300 330 mV LTC3722H-1 270 300 340 mV CLSD Shutdown Current Limit Threshold Measured on CS 0.55 0.65 0.73 V CLDEL Current Limit Delay to Output 100mV Overdrive on CS (Notes 3, 7) 80 ns SSI Soft-Start Current SS = 2.5V 7 12 17 µA SSR Soft-Start Reset Threshold Measured on SS 0.7 0.4 0.1 V FLT Fault Reset Threshold Measured on SS 4.5 3.9 3.5 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings characterization and correlation with statistical process controls. The may cause permanent damage to the device. Exposure to any Absolute LTC3722I-1/LTC3722I-2 are guaranteed over the –40°C to 85°C operating Maximum Rating condition for extended periods may affect device junction temperature range and the LTC3722H-1 is guaranteed over the reliability and lifetime. –40°C to 150°C operating junction temperature range.
Note 2:
Sync amplitude = 5VP-P , pulse width = 75ns. Verify output (A-F) High junction temperatures degrade operating lifetimes; operating lifetime frequency = one-half sync frequency. is derated for junction temperatures greater than 125°C. Note that the
Note 3:
Includes leading edge blanking delay, R maximum ambient temperature consistent with these specifications is LEB = 20k.
Note 4:
FB is driven by a servo-loop amplifier to control V determined by specific operating conditions in conjunction with board COMP for these tests. layout, the rated package thermal impedance and other environmental factors.
Note 5:
Set FB to –0.3V, 2.5V and insure that COMP does not phase invert.
Note 7:
Guaranteed by design, not tested in production.
Note 6:
The LTC3722 is tested under pulsed load condition such that T
Note 8:
Rise time is measured from the 10% to 90% points of the rising J ≈ TA. The LTC3722E-1/LTC3722E-2 are guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to edge of the driver output signal. Fall time is measured from the 90% to 85°C operating junction temperature range are assured by design, 10% points of the falling edge of the driver output signal. Rev C 4 For more information www.analog.com Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagram Operation Revision History Typical application Related Parts