Datasheet LTC3374A (Analog Devices) - 4

LTC3374A
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = VIN1-8 = 3.3V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Temperature Monitor
VTEMP TEMP Voltage at 25°C 200 220 240 mV VTEMP Slope 7 mV/°C OT Overtemperature Shutdown (Note 3) Temperature Rising 170 °C Hysteresis 10 °C
Interface Logic Pins
IOH Output High Leakage Current 5.5V at the PGOOD_ALL Pin –1 0 1 µA VOL Output Low Voltage 3mA into the PGOOD_ALL Pin 0.1 0.4 V VIH Input High Threshold MODE Pin l 1.2 V VIL Input Low Threshold MODE Pin l 0.4 V IIH Input High Leakage Current MODE, EN1-8 –100 0 100 nA IIL Input Low Leakage Current MODE, EN1-8 –100 0 100 nA EN Rising Threshold First Regulator Turning On l 400 730 1200 mV One Regulator Already in Use l 380 400 420 mV EN Falling Threshold l 300 320 340 mV
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LTC3374A includes overtemperature protection which may cause permanent damage to the device. Exposure to any Absolute protects the device during momentary overload conditions. Junction Maximum Rating condition for extended periods may affect device temperatures will exceed 150°C when overtemperature protection is reliability and lifetime. active. Continuous operation above the specified maximum operating
Note 2:
The LTC3374A is tested under pulsed load conditions such that junction temperature may impair device reliability. TJ ≈ TA. The LTC3374AE is guaranteed to meet specifications from
Note 4:
Static current, switches not switching. Actual current may be 0°C to 85°C junction temperature. Specifications over the –40°C to higher due to gate charge losses at the switching frequency. 125°C operating junction temperature range are assured by design,
Note 5:
The current limit features of this part are intended to protect the characterization and correlation with statistical process controls. The IC from short term or intermittent fault conditions. Continuous operation LTC3374AI is guaranteed over the –40°C to 125°C operating junction above the maximum specified pin current rating may result in device temperature range and the LTC3374AH is guaranteed over the –40°C to degradation over time. 150°C operating junction temperature range. High junction temperatures
Note 6:
The Soft-Start Time is the time from the start of switching until the degrade operating lifetimes; operating lifetime is derated for junction FB pin reaches 775mV. When a buck is enabled there is a 100μs (typical) temperatures greater than 125°C. Note that the maximum ambient delay before switching commences. temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance, and other environmental factors. The junction temperature (TJ in °C) is calculated from ambient temperature (TA in °C) and power dissipation (PD in Watts) according to the formula: TJ = TA + (PD • θJA) where θJA (in °C/W) is the package thermal impedance. 3374af 4 For more information www.linear.com/LTC3374A Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information (http://www.linear.com/product/LTC3374A#orderinfo) Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Power Failure Reporting Via PGOOD_ALL Pin Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency Applications Information Buck Switching Regulator Output Voltage and Feedback Network Input and Output Decoupling Capacitor Selection Combined Buck Regulators Buck Regulators PCB Considerations Package Description Typical Application Related Parts