Overview
The LM2735XMFX/NOPB from Texas Instruments is a highly efficient and space-efficient boost and SEPIC DC/DC regulator. This device is designed to provide regulated DC output with fast transient response and is ideal for applications requiring minimal board space. The LM2735 features current-mode control, internal compensation, and a high switching frequency of either 520 kHz or 1.6 MHz, allowing the use of small surface mount inductors and chip capacitors. It is available in tiny SOT-23, WSON, and MSOP-PowerPAD packages, making it suitable for a variety of portable and compact applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.7 | 5.5 | V | |
| Output Voltage Range | 3 | 24 | V | |
| Switch Current | 2.1 | A | ||
| Switching Frequency (LM2735-X) | 1200 | 1600 | 2000 | kHz |
| Switching Frequency (LM2735-Y) | 360 | 520 | 680 | kHz |
| Feedback Voltage Accuracy | ±2% | |||
| Switch ON-Resistance (SOT-23 and MSOP-PowerPAD) | 170 | 330 | mΩ | |
| Switch ON-Resistance (WSON) | 190 | 350 | mΩ | |
| Quiescent Current (switching) | 3.4 | 7 | 11 | mA |
| Quiescent Current (shutdown) | 80 | nA | ||
| Undervoltage Lockout (VIN Rising) | 2.3 | V |
Key Features
- Current-mode control with internal compensation for ease of use and minimal external components.
- High switching frequencies of 520 kHz or 1.6 MHz, enabling the use of small surface mount inductors and chip capacitors.
- Internal soft start to reduce inrush current.
- Pulse-by-pulse current limit to protect the internal NMOS switch.
- Thermal shutdown for overtemperature protection.
- Logic high enable pin for easy shutdown control.
- Ultra-low standby current of 80 nA in shutdown mode.
- Available in SOT-23, WSON, and MSOP-PowerPAD packages for space savings.
Applications
- LCD display backlighting for portable applications.
- OLED panel power supply.
- USB-powered devices.
- Digital still and video cameras.
- White LED current source.
Q & A
- What is the input voltage range of the LM2735?
The input voltage range of the LM2735 is from 2.7 V to 5.5 V. - What are the available switching frequencies for the LM2735?
The LM2735 has two switching frequencies: 520 kHz (LM2735-Y) and 1.6 MHz (LM2735-X). - What is the maximum switch current of the LM2735?
The maximum switch current of the LM2735 is 2.1 A. - What is the feedback voltage accuracy of the LM2735?
The feedback voltage accuracy of the LM2735 is ±2%. - What are the package options for the LM2735?
The LM2735 is available in SOT-23, WSON, and MSOP-PowerPAD packages. - How does the LM2735 protect against overtemperature?
The LM2735 features thermal shutdown for overtemperature protection. - What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is typically 80 nA. - What type of control does the LM2735 use?
The LM2735 uses current-mode control with internal compensation. - What are some common applications for the LM2735?
Common applications include LCD display backlighting, OLED panel power supply, USB-powered devices, digital still and video cameras, and white LED current source. - How does the internal soft start feature work?
The internal soft start feature reduces inrush current during startup.
