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Product Detailed Parameters
- Description：55V wide VIN four-switch buck
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive
- Topology：Buck-Boost
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：0V ~ 55V
- Frequency - Switching：100kHz ~ 2.2MHz
- Duty Cycle (Max)：100%
- Synchronous Rectifier：No
- Clock Sync：Yes
- Serial Interfaces：I2C
- Control Features：Current Limit, Enable, Frequency Control, Power Good, Soft Start, Sync, Tracking
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：40-VFQFN Exposed Pad
- Supplier Device Package：40-VQFN (6x6)
- Grade：-
- Qualification：-
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Overview
The LM51772RHAR is a four-switch buck-boost switching controller from Texas Instruments, designed for wide input voltage applications ranging from 3.5 V to 55 V. It supports output voltages from 1 V to 55 V and operates with a programmable switching frequency between 100 kHz and 2.2 MHz. The device features a maximum duty cycle of 100% and includes an isolated topology option. It functions within an operating temperature range of -40°C to +125°C and utilizes a VQFN-40 surface-mount package.
Feature Summary
- Supports four-switch buck-boost topology for bidirectional power flow
- Enables operation across a wide input voltage range up to 55 V
- Provides programmable switching frequency for optimized efficiency
- Includes integrated shutdown control functionality
Applications
- Industrial power supply systems requiring wide input ranges
- Battery-powered equipment with varying source voltages
- Automotive electronics operating under fluctuating line conditions
- Telecommunications infrastructure power management
Procurement Notes
Verify the specific suffix RHAR against the official datasheet to confirm the VQFN-40 package and tape-and-reel delivery format. Ensure that the required operating temperature range aligns with the specified -40°C to +125°C limits. Confirm isolation requirements if utilizing the isolated variant options available within this component family.
Selection Notes
Select this controller when designing systems necessitating a broad input voltage window extending to 55 V. Consider the VQFN-40 footprint for space-constrained layouts. Evaluate the need for high-frequency operation up to 2.2 MHz to minimize passive component size. Verify compatibility with external MOSFETs for the four-switch configuration.
Part Context
This component belongs to the LM51772 series of DC/DC controllers manufactured by Texas Instruments. It is categorized under switching controllers within the power management IC portfolio. The device serves as a core control element for complex power conversion topologies in industrial and automotive sectors.
Replacement Considerations
Consult the manufacturer's cross-reference guide for direct pin-compatible alternatives. Verify electrical specifications and thermal performance before substituting with other buck-boost controllers.
