Overview
The LTC4449IDCB#TRPBF is a high-speed synchronous N-channel MOSFET driver produced by Analog Devices Inc. This IC is designed to drive two N-channel power MOSFETs in a synchronous power supply configuration. It receives a ground-referenced, low-voltage digital input signal and drives the gates of the MOSFETs accordingly. The device features a unique three-state input stage with transition thresholds proportional to the VLOGIC supply, ensuring compatibility with various controller ICs. An internal voltage regulator limits the input threshold values for VLOGIC supply voltages greater than 5V, enhancing flexibility and reliability.
Key Specifications
| Parameter | Conditions | Min | Typ | Max |
|---|---|---|---|---|
| Operating Junction Temperature Range | - | -40°C | - | 125°C |
| Propagation Delay (IN to BG Low) | - | - | 11 ns | - |
| TG Output Rise Time | 10% to 90%, CL = 3nF | - | 8 ns | - |
| TG Output Fall Time | 90% to 10%, CL = 3nF | - | 7 ns | - |
| BG Output Rise Time | 10% to 90%, CL = 3nF | - | 7 ns | - |
| BG Output Fall Time | 90% to 10%, CL = 3nF | - | 4 ns | - |
| Package Type | - | - | 8-Lead (2mm × 3mm) Plastic DFN | - |
| VCC, VLOGIC, VBOOST Supply Voltage | - | 4V | - | 6.5V |
Key Features
- High-speed operation with propagation delays as low as 11 ns.
- Unique three-state input stage with transition thresholds proportional to the VLOGIC supply.
- Internal voltage regulator to limit input threshold values for VLOGIC supply voltages greater than 5V.
- Overtemperature protection to prevent device damage during momentary overload conditions.
- Compact 8-Lead (2mm × 3mm) Plastic DFN package.
- Wide operating junction temperature range from -40°C to 125°C.
Applications
- Synchronous power supplies and DC-DC converters.
- High-efficiency power management systems.
- Power amplifiers and audio amplifiers requiring high-speed switching.
- Industrial and automotive power systems where reliability and high performance are critical.
Q & A
- What is the operating junction temperature range of the LTC4449IDCB#TRPBF? The operating junction temperature range is from -40°C to 125°C.
- What is the typical propagation delay of the LTC4449IDCB#TRPBF? The typical propagation delay is 11 ns.
- What type of package does the LTC4449IDCB#TRPBF come in? It comes in an 8-Lead (2mm × 3mm) Plastic DFN package.
- Does the LTC4449IDCB#TRPBF have overtemperature protection? Yes, it includes overtemperature protection to protect the device during momentary overload conditions.
- What is the supply voltage range for VCC, VLOGIC, and VBOOST? The supply voltage range is from 4V to 6.5V.
- How does the input stage of the LTC4449IDCB#TRPBF work? The input stage is a unique three-state input stage with transition thresholds proportional to the VLOGIC supply.
- What is the purpose of the internal voltage regulator in the LTC4449IDCB#TRPBF? The internal voltage regulator limits the input threshold values for VLOGIC supply voltages greater than 5V.
- In what types of applications is the LTC4449IDCB#TRPBF commonly used? It is commonly used in synchronous power supplies, DC-DC converters, high-efficiency power management systems, and industrial and automotive power systems.
- How does the LTC4449IDCB#TRPBF drive the MOSFETs? It drives the gates of the MOSFETs based on the state of the input signal, with the low side MOSFET driven to VCC or GND and the high side MOSFET driven to BOOST or TS.
- What are the typical output rise and fall times for the TG and BG outputs? The typical output rise times are 8 ns for TG and 7 ns for BG, while the typical output fall times are 7 ns for TG and 4 ns for BG.
