Overview
The LM2767M5/NOPB, produced by Texas Instruments, is a CMOS charge-pump voltage converter designed to operate as a voltage doubler. This device is suitable for applications requiring a simple and efficient means of doubling the input voltage without the need for an inductor. The LM2767 operates over an input voltage range of 1.8 V to 5.5 V and provides an output current of up to 15 mA. It is particularly useful in battery-powered systems due to its high efficiency and low operating current of 40 µA. The device is packaged in a 5-pin SOT-23 package, making it compact and suitable for a variety of portable and handheld devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (V+ to GND) | 1.8 | 5.5 | V | |
| Output Current (IL) | 10 mA (1.8 V ≤ V+ < 2.5 V) | 15 mA (2.5 V ≤ V+ ≤ 5.5 V) | mA | |
| Output Resistance (ROUT) | 20 | 40 | Ω | |
| Oscillator Frequency (ƒOSC) | 8 | 22 | 50 | kHz |
| Switching Frequency (ƒSW) | 4 | 11 | 25 | kHz |
| Power Efficiency (PEFF) | 96% | % | ||
| Voltage Conversion Efficiency (VOEFF) | 99.96% | % | ||
| Operating Temperature (TA) | -40 | 85 | °C | |
| Junction Temperature (TJ) | -40 | 100 | °C |
Key Features
- Doubles input supply voltage
- Compact 5-pin SOT-23 package
- Low output impedance (20 Ω typical)
- High conversion efficiency (96% typical at 15 mA)
- Low operating current (40 µA typical)
- Operates at 11 kHz switching frequency to avoid audio voice-band interference
- External capacitors for energy transfer and storage
Applications
- Cellular phones
- Pagers
- PDAs and organizers
- Operational amplifier power suppliers
- Interface power suppliers
- Handheld instruments
Q & A
- What is the input voltage range of the LM2767?
The input voltage range of the LM2767 is from 1.8 V to 5.5 V.
- What is the typical output current of the LM2767?
The typical output current of the LM2767 is 15 mA for input voltages between 2.5 V and 5.5 V, and 10 mA for input voltages between 1.8 V and 2.5 V.
- What is the switching frequency of the LM2767?
The switching frequency of the LM2767 is typically 11 kHz, which helps avoid audio voice-band interference.
- What is the efficiency of the LM2767?
The power efficiency of the LM2767 is typically 96% at 15 mA load, and the voltage conversion efficiency is typically 99.96% under no load conditions.
- What package type is the LM2767 available in?
The LM2767 is available in a 5-pin SOT-23 package.
- What are the typical applications of the LM2767?
The LM2767 is typically used in cellular phones, pagers, PDAs, operational amplifier power suppliers, interface power suppliers, and handheld instruments.
- How does the LM2767 double the input voltage?
The LM2767 doubles the input voltage using four large CMOS switches and external capacitors. The switches are sequenced to charge and discharge the capacitors, resulting in an output voltage that is twice the input voltage.
- What is the operating temperature range of the LM2767?
The operating temperature range of the LM2767 is from -40°C to 85°C.
- Can the LM2767 be used in battery-powered systems?
Yes, the LM2767 is suitable for battery-powered systems due to its low operating current and high efficiency.
- How can the output voltage of the LM2767 be regulated?
The output voltage of the LM2767 can be regulated using a low dropout regulator such as the LP2980 series.
