Datasheet LTC3371 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | 4-Channel 8A Configurable Buck DC/DCs with Watchdog and Power-On Reset |
| 页数 / 页 | 26 / 5 — ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 1.1 Mb |
| 文件语言 | 英语 |
ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply over the specified operating
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LTC3371
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 = 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 (RST1-4, WDO, WDI, PLL/MODE, C1, C2, C3)
IOH Output High Leakage Current RST1-4, WDO 5.5V at Pin 1 µA VOL Output Low Voltage RST1-4, WDO 3mA into Pin 0.1 0.4 V VIH WDI Input High Threshold l 1.2 V VIL WDI, C1, C2, C3 Input Low Threshold l 0.4 V tWDI(WIDTH) WDI Pulse Width l 40 ns VIH PLL/MODE, C1, C2, C3 Input High Threshold l VCC – 0.4 V 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 340 390 mV IEN Enable Pin Leakage Current EN = 3.3V 1 µA
CT Timing Parameters; CT = 10nF
tWDI0 Time from WDO Low Until Next WDO Low CT = 10nF 10.3 12.9 15.5 Sec l 6.2 12.9 Sec tWDI Time from Last WDI Until Next WDO Low CT = 10nF 1.30 1.62 1.95 Sec l 0.77 1.62 Sec tWDL Watchdog Lower Boundary CT = 10nF 40 50.6 60 ms l 50.6 65 ms tWDO WDO Low Time Absent a Transition at WDI CT = 10nF 160 202 280 ms tRST RST Assertion Delay CT = 10nF 160 202 240 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings (TJ in °C) is calculated from the ambient temperature (TA in °C) and power may cause permanent damage to the device. Exposure to any Absolute dissipation (PD in Watts) according to the formula: Maximum Rating condition for extended periods may affect device TJ = TA + (PD • θJA) reliability and lifetime. where θJA (in °C/W) is the package thermal impedance.
Note 2:
The LTC3371 is tested under pulsed load conditions such that
Note 3:
The LTC3371 includes overtemperature protection which protects TJ ≈ TA. The LTC3371E is guaranteed to meet specifications from the device during momentary overload conditions. Junction temperatures 0°C to 85°C junction temperature. Specifications over the –40°C to will exceed 150°C when overtemperature protection is active. Continuous 125°C operating junction temperature range are assured by design, operation above the specified maximum operating junction temperature characterization and correlation with statistical process controls. The may impair device reliability. LTC3371I is guaranteed over the –40°C to 125°C operating junction temperature range. The LTC3371H is guaranteed over the –40°C to 150°C
Note 4:
Static current, switches not switching. Actual current may be operating junction temperature range. High junction temperatures degrade higher due to gate charge losses at the switching frequency. operating lifetimes; operating lifetime is derated for junction temperatures
Note 5:
The current limit features of this part are intended to protect the greater than 125°C. Note that the maximum ambient temperature IC from short term or intermittent fault conditions. Continuous operation consistent with these specifications is determined by specific operating above the maximum specified pin current rating may result in device conditions in conjunction with board layout, the rated package thermal degradation over time. impedance and other environmental factors. The junction temperature 3371fb For more information www.linear.com/LTC3371 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 RST Pins Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency Windowed Watchdog Timer Choosing the CT Capacitor 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 Revision History Typical Application Related Parts
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 = 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 (RST1-4, WDO, WDI, PLL/MODE, C1, C2, C3)
IOH Output High Leakage Current RST1-4, WDO 5.5V at Pin 1 µA VOL Output Low Voltage RST1-4, WDO 3mA into Pin 0.1 0.4 V VIH WDI Input High Threshold l 1.2 V VIL WDI, C1, C2, C3 Input Low Threshold l 0.4 V tWDI(WIDTH) WDI Pulse Width l 40 ns VIH PLL/MODE, C1, C2, C3 Input High Threshold l VCC – 0.4 V 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 340 390 mV IEN Enable Pin Leakage Current EN = 3.3V 1 µA
CT Timing Parameters; CT = 10nF
tWDI0 Time from WDO Low Until Next WDO Low CT = 10nF 10.3 12.9 15.5 Sec l 6.2 12.9 Sec tWDI Time from Last WDI Until Next WDO Low CT = 10nF 1.30 1.62 1.95 Sec l 0.77 1.62 Sec tWDL Watchdog Lower Boundary CT = 10nF 40 50.6 60 ms l 50.6 65 ms tWDO WDO Low Time Absent a Transition at WDI CT = 10nF 160 202 280 ms tRST RST Assertion Delay CT = 10nF 160 202 240 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings (TJ in °C) is calculated from the ambient temperature (TA in °C) and power may cause permanent damage to the device. Exposure to any Absolute dissipation (PD in Watts) according to the formula: Maximum Rating condition for extended periods may affect device TJ = TA + (PD • θJA) reliability and lifetime. where θJA (in °C/W) is the package thermal impedance.
Note 2:
The LTC3371 is tested under pulsed load conditions such that
Note 3:
The LTC3371 includes overtemperature protection which protects TJ ≈ TA. The LTC3371E is guaranteed to meet specifications from the device during momentary overload conditions. Junction temperatures 0°C to 85°C junction temperature. Specifications over the –40°C to will exceed 150°C when overtemperature protection is active. Continuous 125°C operating junction temperature range are assured by design, operation above the specified maximum operating junction temperature characterization and correlation with statistical process controls. The may impair device reliability. LTC3371I is guaranteed over the –40°C to 125°C operating junction temperature range. The LTC3371H is guaranteed over the –40°C to 150°C
Note 4:
Static current, switches not switching. Actual current may be operating junction temperature range. High junction temperatures degrade higher due to gate charge losses at the switching frequency. operating lifetimes; operating lifetime is derated for junction temperatures
Note 5:
The current limit features of this part are intended to protect the greater than 125°C. Note that the maximum ambient temperature IC from short term or intermittent fault conditions. Continuous operation consistent with these specifications is determined by specific operating above the maximum specified pin current rating may result in device conditions in conjunction with board layout, the rated package thermal degradation over time. impedance and other environmental factors. The junction temperature 3371fb For more information www.linear.com/LTC3371 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 RST Pins Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency Windowed Watchdog Timer Choosing the CT Capacitor 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 Revision History Typical Application Related Parts