Overview
The LM27403SQ/NOPB, produced by Texas Instruments, is a feature-rich, easy-to-use synchronous buck controller designed for high power density point-of-load (POL) DC-DC regulator solutions. This device operates within a wide input voltage range of 3 V to 20 V, making it compatible with various intermediate bus system rails and battery chemistries. The LM27403 offers exceptional efficiency, size optimization, and excellent load transient response, which are critical for modern computing systems and communication infrastructure equipment. It is available in a 4-mm x 4-mm thermally enhanced WQFN-24 package, enhancing thermal performance and reducing footprint.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 3 | - | 20 | V |
| Output Voltage Range | 0.6 | - | 93% of VIN | V |
| Switching Frequency | 200 kHz | - | 1.2 MHz | - |
| Operating Temperature Range | -40°C | - | 125°C | °C |
| Junction-to-Ambient Thermal Resistance | - | 32.7 | - | °C/W |
| Package Type | - | - | WQFN-24 | - |
| Package Size | - | - | 4 mm x 4 mm | - |
Key Features
- Wide input voltage range of 3 V to 20 V, suitable for various intermediate bus system rails and battery chemistries.
- Programmable switching frequency from 200 kHz to 1.2 MHz.
- Integrated high-current MOSFET drivers with adaptive deadtime.
- 0.6-V reference with 1% feedback accuracy.
- 30-ns minimum on-time for low VOUT.
- Ultrafast line and load transient response.
- High gain-bandwidth error amplifier and PWM line feedforward.
- Lossless inductor DCR current sensing with thermal compensation.
- Integrated VDD bias supply LDO subregulator.
- Programmable system-level OTP with automatic recovery.
- Precision enable with hysteresis and customizable UVLO.
- Output remote sense and monotonic prebiased start-up.
- Open-drain Power Good indicator.
- Frequency synchronization capability.
Applications
The LM27403 is designed for use in high power density point-of-load (POL) DC-DC regulator solutions, particularly in:
- Embedded computing systems.
- Servers and data storage systems.
- Communication infrastructure equipment.
- Applications requiring high efficiency, small footprint, and excellent transient response.
Q & A
- What is the input voltage range of the LM27403?
The input voltage range of the LM27403 is 3 V to 20 V.
- What is the switching frequency range of the LM27403?
The switching frequency range is programmable from 200 kHz to 1.2 MHz.
- What type of package does the LM27403 come in?
The LM27403 is available in a 4-mm x 4-mm thermally enhanced WQFN-24 package.
- Does the LM27403 support thermal compensation for inductor DCR?
Yes, the LM27403 supports lossless inductor DCR current sensing with thermal compensation.
- What is the operating temperature range of the LM27403?
The operating temperature range is -40°C to 125°C.
- Does the LM27403 have integrated MOSFET drivers?
Yes, it has integrated high-current MOSFET drivers with adaptive deadtime.
- What is the feedback accuracy of the LM27403?
The feedback accuracy is 1% with a 0.6-V reference voltage.
- Does the LM27403 support frequency synchronization?
Yes, it supports frequency synchronization for beat frequency sensitive and multiregulator applications.
- What is the purpose of the Power Good indicator in the LM27403?
The Power Good indicator is an open-drain circuit that provides power-rail sequencing and fault reporting.
- Can the LM27403 be used in high power density applications?
Yes, it is designed for high power density point-of-load (POL) DC-DC regulator solutions.
