Overview
The LM2623AMM/NOPB, produced by Texas Instruments, is a high-efficiency, general-purpose, step-up DC-DC switching regulator. This device is designed for battery-powered and low-input voltage systems, offering a wide range of features that make it suitable for various applications. It operates with an input voltage between 0.8 V and 14 V and can produce a regulated output voltage from 1.24 V to 14 V. The LM2623 is known for its low output voltage ripple, high switching frequency up to 2 MHz, and efficient operation with up to 90% regulator efficiency.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 0.8 to 14 | V |
| Output Voltage Range | 1.24 to 14 | V |
| Maximum Load Current | 2 | A |
| Switching Frequency Range | 300 kHz to 2 MHz | |
| Start-up Voltage | 1.1 | V |
| Internal MOSFET Resistance | 0.17 Ω | |
| Typical Operating Current | 80 µA | |
| Shutdown Current | < 2.5 µA | |
| Package Options | 8-Pin VSSOP, 14-Pin WSON |
Key Features
- Good efficiency over a very wide load range
- Very low output voltage ripple
- Up to 2-MHz switching frequency
- Adjustable output voltage from 1.24 V to 14 V
- Internal peak switch current limit and thermal protection circuitry
- Ultra-low quiescent current in shutdown mode (< 2.5 µA)
- Small package options: 8-Pin VSSOP and 14-Pin WSON
- Programmable frequency and duty cycle using external resistors and capacitors
Applications
- Cameras, pagers, and cell phones
- PDAs, palmtop computers, GPS devices
- White LED drive, TFT, or scanned LCDs
- Flash memory programming
- Hand-held instruments
- 1, 2, 3, or 4 cell alkaline systems
- 1, 2, or 3 cell lithium-ion systems
Q & A
- What is the input voltage range of the LM2623?
The LM2623 operates with an input voltage between 0.8 V and 14 V.
- What is the maximum load current the LM2623 can handle?
The LM2623 can handle up to 2 A of load current at low output voltages.
- What are the package options available for the LM2623?
The LM2623 is available in 8-Pin VSSOP and 14-Pin WSON packages.
- How can the switching frequency of the LM2623 be adjusted?
The switching frequency can be adjusted using an external resistor connected to the FREQ pin.
- What is the typical operating current of the LM2623?
The typical operating current is 80 µA.
- What is the shutdown current of the LM2623?
The shutdown current is less than 2.5 µA.
- Does the LM2623 have built-in protection features?
Yes, it includes internal peak switch current limit and thermal protection circuitry.
- How does the LM2623 regulate output voltage?
The LM2623 uses a gated-oscillator topology and pulse frequency modulation to regulate the output voltage.
- Can the LM2623 start up from low input voltages?
Yes, the LM2623 can start up from voltages as low as 1.1 V.
- What are some common applications of the LM2623?
Common applications include cameras, cell phones, PDAs, GPS devices, and hand-held instruments.
