Datasheet LT4422 (Analog Devices) - 10
| Hersteller | Analog Devices |
| Beschreibung | 28V, 4A Ideal Diode |
| Seiten / Seite | 18 / 10 — Data Sheet. LT4422. 5V Power Ride-Through. TO REGULATOR. OUT. COUT 22µF. … |
| Dateiformat / Größe | PDF / 709 Kb |
| Dokumentensprache | Englisch |
Data Sheet. LT4422. 5V Power Ride-Through. TO REGULATOR. OUT. COUT 22µF. SHDN. STATUS. N/C. GND. LTC3625. 4.8V. VIN = 5V. VIN. VOUT. CTL. SW1. 10µF. 287kΩ
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Data Sheet LT4422 5V Power Ride-Through
In a diode-OR configuration, multiple diode cathodes are connected in parallel, with the final output voltage set by the highest cathode potential. The LT4422 is well suited for these applications, with its ability to disable the power path whenever OUT exceeds IN by approximately 20mV or more, allowing no more than 1µA of reverse current. The low reverse leakage and the ability to stand-off 28V and turn off under reverse bias make the LT4422 a high- performance diode replacement. Figure 15 demonstrates a diode-OR application with a super-cap charger to provide load power ride-through in the event of input power loss. The LTC3625 charges two supercapacitors to a sum of 4.8V. Two LT4422s form a diode-OR circuit between the main 5V input and the supercapacitor 4.8V output. The cathodes of the LT4422s connect to a load or a downstream voltage regulator. If the main 5V supply is operating, load power is delivered from the 5V supply. Should the main 5V supply be removed, the 4.8V path turns on, and load power is derived from the supercapacitors.
LT4422 TO REGULATOR IN OUT COUT 22µF SHDN STATUS N/C GND LT4422 LTC3625 4.8V IN OUT VIN = 5V VIN VOUT C1 CTL SW1 R1 C2 10µF 287kΩ EN L1 SW2 100F 3.3µH PFI SHDN STATUS N/C VMID R2 V GND SEL PFO C3 100kΩ PGOOD 100F GND PROG R3 143kΩ
015
Figure 15. Riding through Loss of Primary Power Supply analog.com
Rev. 0 10 of 18 Document Outline Features Applications General Description Simplified Application Diagram TABLE OF CONTENTS Revision History Specifications Absolute Maximum Ratings Pin Configurations and Function Descriptions Typical Performance Characteristics Block Diagram Theory of Operation Applications Information USB PD 3.0 and Back-Up Battery Supply Automatic Power Path Control 5V Power Ride-Through High-Voltage Diode-OR Layout and Thermal Considerations Typical Application High-Load Current Application Reverse Input Voltage Protection Related Parts Outline Dimensions Ordering Guide
Data Sheet LT4422 5V Power Ride-Through
In a diode-OR configuration, multiple diode cathodes are connected in parallel, with the final output voltage set by the highest cathode potential. The LT4422 is well suited for these applications, with its ability to disable the power path whenever OUT exceeds IN by approximately 20mV or more, allowing no more than 1µA of reverse current. The low reverse leakage and the ability to stand-off 28V and turn off under reverse bias make the LT4422 a high- performance diode replacement. Figure 15 demonstrates a diode-OR application with a super-cap charger to provide load power ride-through in the event of input power loss. The LTC3625 charges two supercapacitors to a sum of 4.8V. Two LT4422s form a diode-OR circuit between the main 5V input and the supercapacitor 4.8V output. The cathodes of the LT4422s connect to a load or a downstream voltage regulator. If the main 5V supply is operating, load power is delivered from the 5V supply. Should the main 5V supply be removed, the 4.8V path turns on, and load power is derived from the supercapacitors.
LT4422 TO REGULATOR IN OUT COUT 22µF SHDN STATUS N/C GND LT4422 LTC3625 4.8V IN OUT VIN = 5V VIN VOUT C1 CTL SW1 R1 C2 10µF 287kΩ EN L1 SW2 100F 3.3µH PFI SHDN STATUS N/C VMID R2 V GND SEL PFO C3 100kΩ PGOOD 100F GND PROG R3 143kΩ
015
Figure 15. Riding through Loss of Primary Power Supply analog.com
Rev. 0 10 of 18 Document Outline Features Applications General Description Simplified Application Diagram TABLE OF CONTENTS Revision History Specifications Absolute Maximum Ratings Pin Configurations and Function Descriptions Typical Performance Characteristics Block Diagram Theory of Operation Applications Information USB PD 3.0 and Back-Up Battery Supply Automatic Power Path Control 5V Power Ride-Through High-Voltage Diode-OR Layout and Thermal Considerations Typical Application High-Load Current Application Reverse Input Voltage Protection Related Parts Outline Dimensions Ordering Guide