Datasheet LT3743 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | High Current Synchronous Step-Down LED Driver with Three-State Control |
| Pages / Page | 28 / 10 — PIN FUNCTIONS (QFN/TSSOP) PWMGL (Pin 22/Pin 23):. LG (Pin 26/Pin 28):. HG … |
| File Format / Size | PDF / 535 Kb |
| Document Language | English |
PIN FUNCTIONS (QFN/TSSOP) PWMGL (Pin 22/Pin 23):. LG (Pin 26/Pin 28):. HG (Pin 23/Pin 24):. VCC_INT (Pin 27/Pin 1):
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Text Version of Document
LT3743
PIN FUNCTIONS (QFN/TSSOP) PWMGL (Pin 22/Pin 23):
The PWMGL output pin drives
LG (Pin 26/Pin 28):
LG is the bottom FET gate drive sig- the gate of an external FET to connect one of the switching nal that controls the state of the low side external power regulator output capacitors to the load. The driver pull-up FET. The driver pull-up impedance is 2.5Ω and pull-down impedance is 3.2Ω and pull-down impedance is 1.75Ω. impedance is 1.3Ω.
HG (Pin 23/Pin 24):
HG is the top FET gate drive signal
VCC_INT (Pin 27/Pin 1):
A regulated 5V output for charging that controls the state of the high side external power the CBOOT capacitor. VCC_INT also provides the power for FET. The driver pull-up impedance is 2.3Ω and pull-down the digital and switching subcircuits. Below 6V VIN, tie impedance is 1.3Ω. this pin to the rail. VCC_INT is current limited to ≈50mA.
SW (Pin 24/Pin 25):
The SW pin is used internally as the Shutdown operation disables the output voltage drive. lower rail for the floating high side driver. Externally, this
VIN (Pin 28/Pin 3):
Input Supply Pin. Must be locally node connects the two power FETs and the inductor. bypassed with a 1µF low ESR capacitor to ground.
CBOOT (Pin 25/Pin 26):
The CBOOT pin provides a float- ing 5V regulated supply for the high side FET driver. An external Schottky diode is required from the VCC_INT pin to the CBOOT pin to charge the CBOOT capacitor when the switch pin is near ground. 3743fe 10 For more information www.linear.com/LT3743 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
PIN FUNCTIONS (QFN/TSSOP) PWMGL (Pin 22/Pin 23):
The PWMGL output pin drives
LG (Pin 26/Pin 28):
LG is the bottom FET gate drive sig- the gate of an external FET to connect one of the switching nal that controls the state of the low side external power regulator output capacitors to the load. The driver pull-up FET. The driver pull-up impedance is 2.5Ω and pull-down impedance is 3.2Ω and pull-down impedance is 1.75Ω. impedance is 1.3Ω.
HG (Pin 23/Pin 24):
HG is the top FET gate drive signal
VCC_INT (Pin 27/Pin 1):
A regulated 5V output for charging that controls the state of the high side external power the CBOOT capacitor. VCC_INT also provides the power for FET. The driver pull-up impedance is 2.3Ω and pull-down the digital and switching subcircuits. Below 6V VIN, tie impedance is 1.3Ω. this pin to the rail. VCC_INT is current limited to ≈50mA.
SW (Pin 24/Pin 25):
The SW pin is used internally as the Shutdown operation disables the output voltage drive. lower rail for the floating high side driver. Externally, this
VIN (Pin 28/Pin 3):
Input Supply Pin. Must be locally node connects the two power FETs and the inductor. bypassed with a 1µF low ESR capacitor to ground.
CBOOT (Pin 25/Pin 26):
The CBOOT pin provides a float- ing 5V regulated supply for the high side FET driver. An external Schottky diode is required from the VCC_INT pin to the CBOOT pin to charge the CBOOT capacitor when the switch pin is near ground. 3743fe 10 For more information www.linear.com/LT3743 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
