Overview
The LM2733XMF-TI, produced by Texas Instruments, is a high-frequency switching boost converter IC designed for applications requiring high power density and efficiency. This device operates in current-mode control, offering fast transient response over a wide input voltage range. It is available in two versions: the "X" version, which operates at a switching frequency of 1.6 MHz, and the "Y" version, which operates at 600 kHz. The LM2733 features a 40-V internal DMOS FET switch, enabling it to boost voltages up to 16 V or greater. The device is packaged in a compact 5-pin SOT-23 package, making it ideal for space-constrained designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Switching Frequency | 1.6 MHz (X option), 0.6 MHz (Y option) | MHz |
| Input Voltage Range | 2.7 V to 14 V | V |
| Switch Current | Up to 1 A | A |
| Maximum Duty Cycle | 93% (X option), 96% (Y option) | % |
| Shutdown Current | < 1 µA | µA |
| Package Type | 5-Pin SOT-23 | |
| Operating Temperature Range | -40°C to +125°C | °C |
Key Features
- 40-V DMOS FET switch
- Low RDS(ON) DMOS FET
- High power density due to minimal power loss and use of small inductors and capacitors
- Logic-level shutdown pin for reducing quiescent current and extending battery life
- Cycle-by-cycle current limiting and thermal shutdown for protection
- Internal compensation simplifies design and reduces component count
- Uses tiny capacitors and inductors
Applications
- White LED current source
- PDAs and palm-top computers
- Digital cameras
- Portable phones and games
- Local boost regulator in various portable electronic devices
Q & A
- What are the switching frequencies of the LM2733XMF-TI?
The LM2733XMF-TI operates at either 1.6 MHz (X option) or 0.6 MHz (Y option). - What is the input voltage range of the LM2733XMF-TI?
The input voltage range is from 2.7 V to 14 V. - What is the maximum switch current of the LM2733XMF-TI?
The maximum switch current is up to 1 A. - What is the package type of the LM2733XMF-TI?
The device is packaged in a 5-pin SOT-23 package. - How does the shutdown pin function?
The device can be turned off by pulling the shutdown pin low. If not used, it should be tied directly to VIN. - What kind of protection does the LM2733XMF-TI offer?
The device offers cycle-by-cycle current limiting and thermal shutdown for protection. - What are the typical applications of the LM2733XMF-TI?
Typical applications include white LED current sources, PDAs, digital cameras, portable phones, and games. - What is the operating temperature range of the LM2733XMF-TI?
The operating temperature range is from -40°C to +125°C. - How does the internal compensation simplify the design?
The internal compensation reduces the component count and simplifies the design process. - What type of capacitors are recommended for use with the LM2733XMF-TI?
Multilayer ceramic capacitors with X5R and X7R dielectric types are recommended due to their low ESR and high resonance frequency.
