Overview
The LM2735XMY/NOPB is a highly efficient and easy-to-use switching regulator produced by Texas Instruments. This device is designed for boost and SEPIC (Single-Ended Primary-Inductor Converter) applications, offering a regulated DC output with fast transient response. The LM2735 features current-mode control and internal compensation, which simplifies the design and minimizes the number of external components required. It operates at two preset switching frequencies: 520 kHz (LM2735-Y) and 1.6 MHz (LM2735-X), allowing for the use of small surface mount capacitors and inductors, thus reducing the overall PCB area.
Key Specifications
| Parameter | Min | 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 |
| Maximum Duty Cycle (LM2735-X) | 88% | 96% | - | % |
| Maximum Duty Cycle (LM2735-Y) | 91% | 99% | - | % |
| Switch ON-Resistance (SOT-23 and MSOP-PowerPAD) | 170 | - | 330 | mΩ |
| Switch ON-Resistance (WSON) | 190 | - | 350 | mΩ |
| Quiescent Current (switching, LM2735-X) | 7 | - | 11 | mA |
| Quiescent Current (switching, LM2735-Y) | 3.4 | - | 7 | mA |
| Quiescent Current (shutdown) | - | 80 | - | nA |
| Undervoltage Lockout (VIN Rising) | - | 2.3 | - | V |
Key Features
- Current-mode control for precise output voltage regulation
- Internal compensation and soft start for ease of use and reduced external components
- High switching frequencies (520 kHz and 1.6 MHz) allowing for small surface mount components
- Ultra-low standby current of 80 nA in shutdown mode
- Pulse-by-pulse current limiting and thermal shutdown for protection
- Logic high enable pin for easy control
- Feedback voltage accuracy of ±2%
- Available in tiny SOT-23, WSON, and MSOP-PowerPAD packages
Applications
- LCD display backlighting for portable applications
- OLED panel power supply
- USB-powered devices
- Digital still and video cameras
- White LED current source
- For automotive applications, see the LM2735-Q1 variant
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 operates at two preset 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 over the full temperature range.
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is 80 nA.
- What type of control does the LM2735 use?
The LM2735 uses current-mode control.
- What are the package options for the LM2735?
The LM2735 is available in SOT-23, WSON, and MSOP-PowerPAD packages.
- What is the feedback voltage accuracy of the LM2735?
The feedback voltage accuracy of the LM2735 is ±2%.
- Does the LM2735 have built-in protection features?
Yes, the LM2735 includes pulse-by-pulse current limiting and thermal shutdown for protection.
- What are some typical applications of the LM2735?
Typical 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 LM2735 reduce the need for external components?
The LM2735 reduces the need for external components through its internal compensation and soft start features.
