Overview
The LM2733YMFX is a high-frequency switching boost converter IC produced by Texas Instruments. It is part of the LM2733 series, which includes devices operating at fixed frequencies of either 0.6 MHz or 1.6 MHz. The LM2733YMFX specifically operates at 0.6 MHz. This device is designed for applications requiring high power density and efficiency, particularly in portable and compact electronic devices. It features a 40-V internal DMOS FET switch, allowing for high output voltages and low power loss. The IC is packaged in a 5-pin SOT-23 package, making it suitable for space-constrained designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Switching Frequency | 0.6 MHz | |
| Internal FET Switch Voltage | 40 V | |
| Maximum Switch Current | 1 A | |
| Input Voltage Range | 2.7 V to 14 V | |
| Shutdown Current | < 1 µA | |
| Package Type | 5-pin SOT-23 | |
| Maximum Duty Cycle | 96% | |
| Operating Temperature Range | -40°C to +125°C |
Key Features
- 40-V DMOS FET switch for high output voltages
- High switching frequencies: 0.6 MHz or 1.6 MHz options
- Low RDS(ON) DMOS FET for minimal power loss
- Wide input voltage range: 2.7 V to 14 V
- Low shutdown current (< 1 µA) for extended battery life
- Compact 5-pin SOT-23 package for high power density
- Uses tiny capacitors and inductors
- Cycle-by-cycle current limiting and thermal shutdown for protection
- Internally compensated for simplified design and reduced component count
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 is the switching frequency of the LM2733YMFX?
The LM2733YMFX operates at a switching frequency of 0.6 MHz. - What is the maximum switch current of the LM2733YMFX?
The maximum switch current is up to 1 A. - What is the input voltage range of the LM2733YMFX?
The input voltage range is from 2.7 V to 14 V. - How does the shutdown feature work on the LM2733YMFX?
The device can be turned off by pulling the shutdown pin low. If not used, the pin should be tied directly to VIN. - What type of package does the LM2733YMFX come in?
The LM2733YMFX is packaged in a 5-pin SOT-23 package. - What are the key protection features of the LM2733YMFX?
The device features cycle-by-cycle current limiting and thermal shutdown for protection. - What are some typical applications for the LM2733YMFX?
Typical applications include white LED current sources, PDAs, digital cameras, portable phones, and games. - How does the internal compensation of the LM2733YMFX simplify design?
The internal compensation reduces the component count and simplifies the design process. - What is the operating temperature range of the LM2733YMFX?
The operating temperature range is from -40°C to +125°C. - What type of capacitors are recommended for use with the LM2733YMFX?
Multi-layer ceramic capacitors with X5R and X7R dielectric types are recommended due to their low ESR and high resonance frequency.
