Datasheet LTC3370 (Analog Devices) - 5

LTC3370
e lecTrical 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 = VINA-H = 3.3V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Buck Regulators Combined
IFWD2 PMOS Current Limit 2 Buck Power Stages Combined (Note 5) 4.6 A IFWD3 PMOS Current Limit 3 Buck Power Stages Combined (Note 5) 6.9 A IFWD4 PMOS Current Limit 4 Buck Power Stages Combined (Note 5) 9.2 A
Interface Logic Pins (PGOODALL, PLL/MODE, CT, C1, C2, C3)
IOH Output High Leakage Current PGOODALL 5.5V at Pin 1 µA VOL Output Low Voltage PGOODALL 3mA into Pin 0.1 0.4 V VIL C1, C2, C3 Input Low Threshold l 0.4 V VIH PLL/MODE, CT, C1, C2, C3 Input High l VCC – 0.4 V Threshold VIL PLL/MODE Input Low Threshold l VCC – 1.2 V
Interface Logic Pins (EN1, EN2, EN3, EN4)
VHI(ALLOFF) Enable Rising Threshold All Regulators Disabled l 730 1200 mV VHI Enable Rising Threshold At Least One Regulator Enabled l 400 420 mV VLO Enable Falling Threshold 340 375 mV IEN Enable Pin Leakage Current EN = 3.3V 1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LTC3370 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 LTC3370 is tested under pulsed load conditions such that may impair device reliability. TJ ≈ TA. The LTC3370E 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 LTC3370I is guaranteed over the –40°C to 125°C operating junction above the maximum specified pin current rating may result in device temperature range. The LTC3370H is guaranteed over the –40°C to 150°C degradation over time. operating junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater than 125°C. Note that the maximum ambient 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 the 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. 3370fb For more information www.linear.com/LTC3370 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Power Failure Reporting Via PGOODALL Pin Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency Applications Information Buck Switching Regulator Output Voltage and Feedback Network Buck Regulators Combined Buck Power Stages Input and Output Decoupling Capacitor Selection PCB Considerations Typical Applications Package Description Typical Application Related Parts