Overview
The LM27403SQX/NOPB, produced by Texas Instruments, is a feature-rich synchronous buck controller designed for high power density point-of-load (POL) DC-DC regulator solutions. This controller offers exceptional efficiency, integration, and performance, making it ideal for applications requiring high current output and precise voltage regulation. With an input voltage range of 3 V to 20 V, it is compatible with various intermediate bus system rails and battery chemistries. The output voltage is adjustable from 0.6 V to as high as 93% of the input voltage, ensuring better than ±1% feedback system regulation accuracy over the full junction temperature range.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 3 | - | 20 | V |
| Output Voltage Range | 0.6 | - | 93% of VIN | V |
| Switching Frequency Range | 200 kHz | - | 1.2 MHz | - |
| Maximum Duty Cycle | - | - | 93% | - |
| Minimum On-Time | - | - | 30 ns | - |
| Package Type | - | - | WQFN-24 PowerPAD | - |
| Package Size | - | - | 4 mm x 4 mm | - |
| Junction-to-Ambient Thermal Resistance | - | - | 32.7 °C/W | - |
Key Features
- Up to 97% efficiency and 93% duty cycle
- Wide input voltage range of 3 V to 20 V
- Programmable 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
- 30-ns minimum on-time for low VOUT
- Integrated high-current MOSFET drivers with adaptive deadtime
- Ultrafast line and load transient response
- High gain-bandwidth error amplifier and PWM line feedforward
- Integrated VDD bias supply LDO subregulator
- Programmable system-level OTP with automatic recovery
- Precision enable with customizable hysteresis for UVLO
- Frequency synchronization capability
- Monotonic prebiased start-up and programmable soft-start with tracking
- Output remote sense and open-drain Power Good indicator
Applications
- DC-DC converters and POL modules
- Telecommunications infrastructure
- Embedded computing, servers, and storage systems
- High power density point-of-load (POL) regulator solutions
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 maximum duty cycle of the LM27403?
The maximum duty cycle of the LM27403 is 93%.
- What is the switching frequency range of the LM27403?
The switching frequency range of the LM27403 is from 200 kHz to 1.2 MHz.
- How does the LM27403 handle overcurrent protection?
The LM27403 uses inductor-DCR-based overcurrent protection with thermal compensation.
- What is the minimum on-time for the LM27403?
The minimum on-time for the LM27403 is 30 ns.
- Does the LM27403 support frequency synchronization?
Yes, the LM27403 supports frequency synchronization.
- What type of package does the LM27403 come in?
The LM27403 comes in a 4-mm x 4-mm WQFN-24 PowerPAD package.
- What are some key applications of the LM27403?
The LM27403 is used in DC-DC converters, POL modules, telecommunications infrastructure, and embedded computing systems.
- Does the LM27403 have integrated MOSFET drivers?
Yes, the LM27403 has integrated high-current MOSFET drivers with adaptive deadtime.
- How does the LM27403 handle thermal shutdown?
The LM27403 has programmable system-level thermal shutdown with automatic recovery, using an external NPN transistor to sense temperature.
