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Product Detailed Parameters
- Description：IC REG CTRLR MULT TOP 20TSSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Output Type：Transistor Driver
- Function：Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration：Positive or Negative
- Topology：Buck, Boost, Buck-Boost
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：-4.5V ~ -80V
- Frequency - Switching：100kHz ~ 750kHz
- Duty Cycle (Max)：-
- Synchronous Rectifier：Yes
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Supplier Device Package：20-TSSOP-EP
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Overview
The LT8709IFE#PBF is a synchronous PWM controller designed for negative-to-negative or negative-to-positive DC/DC conversion. It supports Boost, Buck, Inverting, and SEPIC topologies with a single output. The device operates within an input voltage range of -4.5V to -80V and delivers up to 25A output current. It features a fixed switching frequency of 750 kHz and an adjustable range from 100kHz to 750 kHz. The output voltage ranges from 1.234V to 80V. Operating temperatures span from -40°C to +125°C. It is housed in a TSSOP-20 package.
Feature Summary
- Supports multiple topologies including Boost, Buck, Inverting, and SEPIC for flexible power conversion architectures.
- Provides rail-to-rail output current monitoring for precise load management and protection.
- Designed specifically for negative input voltage applications converting to negative or positive outputs.
Applications
- Negative-to-positive DC/DC conversion systems
- Negative-to-negative DC/DC conversion systems
- Industrial power supplies requiring multi-topology flexibility
Procurement Notes
Verify the specific suffix #PBF indicates tube packaging versus #TRPBF for tape and reel when ordering. Confirm availability status as supply may be limited or subject to factory special orders. Ensure the TSSOP-20 package variant matches the design requirements. Check RoHS compliance details through official manufacturer documentation before finalizing procurement decisions.
Selection Notes
Select this component for designs requiring negative input voltages up to -80V. The 25A output capability suits high-current applications. Consider the 750 kHz switching frequency for balancing efficiency and component size. The TSSOP-20 package offers a compact solution for space-constrained boards. Verify thermal performance within the -40°C to +125°C operating range.
Part Context
The LT8709 belongs to Analog Devices' family of synchronous PWM controllers. It complements parts like the LT8708, which serves as a bidirectional buck-boost slave controller. Unlike the LTC3769, which focuses on boost conversion with low quiescent current, the LT8709 emphasizes multi-topology support for complex negative-input scenarios.
Replacement Considerations
No public confirmed substitute part numbers are available in the provided data. Evaluate the LT8708ILWE-1#PBF for bidirectional buck-boost applications, though topology differences exist. Consult Analog Devices engineering for direct replacements if the LT8709IFE#PBF is unavailable.
FAQ
What input voltage range does the LT8709IFE#PBF support?
The device supports an input voltage range from -4.5V to -80V.
Does the LT8709IFE#PBF support positive output voltages?
Yes, it is designed for negative-to-positive DC/DC conversion with an output voltage range up to 80V.
