Datasheet LTC3374 (Analog Devices) - 5

LTC3374
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full 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 Interface Logic Pins (PGOOD_ALL, MODE)
IOH Output High Leakage Current PGOOD_ALL 5.5V at Pin –1 1 µA VOL Output Low Voltage PGOOD_ALL 3mA into Pin 0.1 0.4 V VIH Input High Threshold MODE l 1.2 V VIL Input Low Threshold MODE l 0.4 V
Interface Logic Pins (EN1, EN2, EN3, EN4, EN5, EN6, EN7, EN8)
VHI_ALLOFF Enable Rising Threshold All Regulators Disabled l 400 730 1200 mV VEN_HYS Enable Falling Hysteresis 60 mV VHI Enable Rising Threshold At Least One Regulator Enabled l 380 400 420 mV IEN Enable Pin Leakage Current EN = VCC = VIN = 5.5V –1 1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LTC3374 includes overtemperature protection which protects may cause permanent damage to the device. Exposure to any Absolute the device during momentary overload conditions. Junction temperatures Maximum Rating condition for extended periods may affect device will exceed 150°C when overtemperature protection is active. Continuous reliability and lifetime. operation above the specified maximum operating junction temperature
Note 2:
The LTC3374 is tested under pulsed load conditions such that may impair device reliability. TJ ≈ TA. The LTC3374E 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 LTC3374I 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 LTC3374H is guaranteed over the –40°C to degradation over time. 150°C operating junction temperature range. High junction temperatures
Note 6:
The soft-start is the time from the first top switch turn on, after an degrade operating lifetimes; operating lifetime is derated for junction enable rising, until the feedback has reached 90% of its nominal regulation temperatures greater than 125°C. Note that the maximum ambient voltage. 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. 3374fc For more information www.linear.com/LTC3374 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information 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 Buck Regulators Combined Buck Regulators Input and Output Decoupling Capacitor Selection PCB Considerations Package Description Revision History Typical Application Related Parts