Overview
The LM27403SQE/NOPB from Texas Instruments is a feature-rich, synchronous buck controller designed for high power density, point-of-load (POL) DC-DC regulator solutions. This device is part of the power management family and is particularly suited for applications requiring high efficiency, compact size, and robust performance. The LM27403 supports an input voltage range of 3 V to 20 V, making it compatible with various intermediate bus system rails and battery chemistries. It offers an adjustable output voltage from 0.6 V to as high as 93% of the input voltage, with better than ±1% feedback system regulation accuracy over the full junction temperature range.
The device is housed in a 4-mm x 4-mm thermally enhanced WQFN-24 PowerPAD package, which enhances thermal performance and reduces the overall solution size. The LM27403 integrates high-current MOSFET drivers, a low dropout (LDO) bias supply linear regulator, and comprehensive fault protection features, including overvoltage, undervoltage, overcurrent, and overtemperature protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3 V to 20 V | V |
| Output Voltage Range | 0.6 V to 93% of Input Voltage | V |
| Switching Frequency | 200 kHz to 1.2 MHz | Hz |
| Minimum On-Time | 30 ns | ns |
| Feedback Accuracy | ±1% | % |
| Package Type | WQFN-24 PowerPAD | - |
| Package Size | 4 mm x 4 mm | mm |
| Operating Temperature Range | -40°C to 125°C | °C |
| Junction-to-Ambient Thermal Resistance | 32.7 °C/W | °C/W |
Key Features
- Up to 97% Efficiency and 93% Duty Cycle
- Wide Input Voltage Range of 3 V to 20 V
- Switching Frequency From 200 kHz to 1.2 MHz
- Inductor-DCR-Based Overcurrent Protection With Thermal Compensation
- 0.6-V Reference With 1% Feedback Accuracy
- Integrated High-Current MOSFET Drivers
- Adaptive Deadtime Control
- Ultrafast Line and Load Transient Response
- High GBW Error Amplifier
- PWM Line Feedforward
- Integrated VDD Bias Supply LDO Subregulator
- Programmable System-Level OTP
- Precision Enable With Hysteresis
- Frequency Synchronization
- Monotonic Prebiased Start-up
- Programmable Soft-Start With Tracking
- Output Remote Sense
- Open-Drain Power Good Indicator
Applications
The LM27403 is designed for use in various high power density applications, including:
- Embedded Computing and Servers
- Storage Systems
- Communications Infrastructure Equipment
- Point-of-Load (POL) DC-DC Regulator Solutions
- Intermediate Bus Converters with output rails centered at 12 V and 9.6 V
These applications benefit from the device's high efficiency, compact size, and robust performance features.
Q & A
- What is the input voltage range of the LM27403?
The input voltage range of the LM27403 is from 3 V to 20 V.
- What is the output voltage range of the LM27403?
The output voltage range is adjustable from 0.6 V to as high as 93% of the input voltage.
- What is the switching frequency range of the LM27403?
The switching frequency can be programmed between 200 kHz and 1.2 MHz.
- What type of package does the LM27403 come in?
The LM27403 is housed in a 4-mm x 4-mm thermally enhanced WQFN-24 PowerPAD package.
- What is the operating temperature range of the LM27403?
The operating temperature range is from -40°C to 125°C.
- Does the LM27403 have overcurrent protection?
- What is the feedback accuracy of the LM27403?
The feedback accuracy is ±1%.
- Does the LM27403 support frequency synchronization?
- What kind of fault protection does the LM27403 offer?
The LM27403 offers comprehensive fault protection including overvoltage, undervoltage, overcurrent, and overtemperature protection.
- How does the LM27403 handle thermal shutdown?
The LM27403 supports programmable system-level thermal shutdown with automatic recovery and monitors the PCB temperature to initiate thermal shutdown if necessary.
