Overview
The LM27313XQMF/NOPB is a high-efficiency, current-mode boost converter IC produced by Texas Instruments. This device operates at a fixed switching frequency of 1.6 MHz and is packaged in a compact SOT-23 package. It is designed for applications requiring a wide input voltage range and minimal external components. The LM27313-Q1 variant is AEC-Q100 Grade 1 qualified, making it suitable for automotive applications with an operating junction temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Supply Voltage | 2.7 | 14.5 | V | |
| SW Pin Voltage | −0.4 | 30 | V | |
| Shutdown Threshold | 0.50 | 1.5 | V | |
| Switch Current Limit | 0.80 | 1.25 | A | |
| Switch ON Resistance | 500 | 650 | mΩ | |
| Junction Temperature | −40 | 125 | °C | |
| Junction-to-ambient thermal resistance (RθJA) | 166.3 | °C/W |
Key Features
- Fixed 1.6 MHz switching frequency for high efficiency and small solution size.
- Current-mode control for fast transient response and pulse-by-pulse current limiting protection.
- Logic level shutdown pin for low power consumption, typically 24 nA in shutdown mode.
- Internal control loop compensation, eliminating the need for additional external components.
- Thermal shutdown and cycle-by-cycle current limiting for enhanced protection.
- AEC-Q100 Grade 1 qualified for automotive applications (LM27313-Q1 variant).
Applications
The LM27313 is suitable for a variety of applications requiring high-efficiency boost conversion with minimal external components. These include:
- Automotive systems (LM27313-Q1 variant) due to its AEC-Q100 Grade 1 qualification.
- Portable electronics where small size and high efficiency are critical.
- Industrial power supplies requiring a wide input voltage range.
- Battery-powered devices needing efficient voltage boosting.
Q & A
- What is the operating frequency of the LM27313?
The LM27313 operates at a fixed frequency of 1.6 MHz.
- What is the input voltage range of the LM27313?
The input voltage range is from 2.7 V to 14.5 V.
- What type of capacitors are recommended for use with the LM27313?
Ceramic capacitors with X5R or X7R dielectric types are recommended.
- Does the LM27313 have built-in protection features?
- What is the typical shutdown current of the LM27313?
The typical shutdown current is 24 nA.
- Is the LM27313-Q1 variant suitable for automotive applications?
- What is the junction temperature range of the LM27313-Q1?
The junction temperature range is from –40°C to +125°C.
- How does the LM27313 regulate output voltage?
The output voltage is regulated using a resistive divider connected to the feedback pin (FB).
- What are the recommended layout guidelines for the LM27313?
Components should be placed close to the IC, and a 4-layer PCB with internal ground planes is recommended.
- Can electrolytic capacitors be used with the LM27313?
No, electrolytic capacitors are not recommended due to their resonant frequencies being below the switching frequency of the device.
