Datasheet LT3690 (Analog Devices) - 4

LT3690
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 12V unless otherwise noted (Notes 3, 7). PARAMETER CONDITIONS MIN TYP MAX UNITS
PG Threshold as Percentage of VFB VFB Rising 88 90 92 % PG Hysteresis 12 mV PG Sink Current VPG = 0.3V l 100 500 µA PG Leakage VPG = 5V 0.1 1 µA Error Amplifier Transconductance 400 µA/V Error Amp Voltage Gain 60 dB VC Source Current –50 µA VC Sink Current 50 µA VC Pin to Switch Current Gain 4.6 A/V Transconductance VC Switching Threshold 0.7 V VC Clamp Voltage 2.0 V Programmable Switching Frequency RT = 10kΩ 1.32 1.5 1.68 MHz RT = 24.9kΩ 660 750 840 kHz RT = 180kΩ 122 138 154 kHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
This IC includes overtemperature protection that is intended may cause permanent damage to the device. Exposure to any Absolute to protect the device during momentary overload conditions. Junction Maximum Rating condition for extended periods may affect device temperature will exceed the maximum operating junction temperature reliability and lifetime. when overtemperature protection is active. Continuous operation above
Note 2:
Absolute maximum voltage at the EN, UVLO and V the specified maximum operating junction temperature may impair device IN pins is 36V for continuous operation. For non-repetitive 1 second transients while reliability. TJ < 125°C, the absolute maximum voltage is 60V.
Note 5:
This is the minimum voltage across the boost capacitor needed to
Note 3:
The LT3690E is guaranteed to meet performance specifications guarantee full saturation of the switch. from 0°C to 125°C junction temperature. Specifications over the –40°C
Note 6:
Current limit guaranteed by design and/or correlation to static test. to 125°C operating junction temperature range are assured by design, Slope compensation reduces current limit at higher duty cycles. Current characterization and correlation with statistical process controls. The limit reduced when feedback voltage is below the reference voltage. LT3690I is guaranteed over the full –40°C to 125°C operating junction
Note 7:
The voltages are referred to GND and currents are assumed temperature range. The LT3690H is guaranteed over the full –40°C to positive, when the current flows into the pin. Negative magnitudes are 150°C operating junction temperature range. The LT3690MP is guaranteed shown as maximum. over the full –55°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetime. Operating lifetime is derated at junction temperatures greater than 125°C. 3690fb 4 For more information www.linear.com/LT3690 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts