Overview
The LM2704MF-ADJ/NOPB is a micropower step-up DC/DC converter produced by Texas Instruments. It is designed to operate in a small 5-lead SOT-23 package, making it ideal for space-conscious and portable applications. This device features a current-limited, fixed off-time control scheme that conserves operating current, resulting in high efficiency over a wide range of load conditions. The LM2704 can generate output voltages up to 20V from an input voltage range of 2.2V to 7V, making it suitable for various applications including LCD bias supplies, white LED back-lighting, and handheld devices.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Input Voltage Range (VIN) | 2.2 | 7.0 | V | |
| Switch Current Limit (ICL) | 490 | 550 | 610 | mA |
| Switch RDSON | 0.7 | 1.6 | Ω | |
| Switch Off Time (TOFF) | 400 | ns | ||
| Feedback Trip Point (VFB) | 1.189 | 1.237 | 1.269 | V |
| Shutdown Current (ISD) | 0.01 | 2.5 | µA | |
| Input Undervoltage Lockout (UVP) | 1.8 | V | ||
| Thermal Resistance (θJA) | 220 | °C/W | ||
| Maximum Junction Temperature (TJ(MAX)) | 150 | °C |
Key Features
- Adjustable output voltage up to 20V
- 550mA, 0.7Ω internal switch
- Uses small surface mount components
- Current-limited, fixed off-time control scheme for high efficiency
- Low 400ns off-time allows use of tiny, low-profile inductors and capacitors
- Input undervoltage lockout
- Shutdown current as low as 0.01µA
- Small 5-lead SOT-23 package
Applications
- LCD bias supplies
- White LED back-lighting for cellular phones and other handheld devices
- Digital cameras
- Portable applications requiring low current and high efficiency
- Handheld devices
Q & A
- What is the input voltage range of the LM2704?
The input voltage range of the LM2704 is from 2.2V to 7V.
- What is the maximum output voltage that the LM2704 can generate?
The LM2704 can generate output voltages up to 20V.
- What is the switch current limit of the LM2704?
The switch current limit of the LM2704 is 550mA.
- What is the typical shutdown current of the LM2704?
The typical shutdown current of the LM2704 is 0.01µA.
- What package type is the LM2704 available in?
The LM2704 is available in a small 5-lead SOT-23 package.
- What is the thermal resistance (θJA) of the LM2704?
The thermal resistance (θJA) of the LM2704 is 220°C/W.
- What is the maximum junction temperature of the LM2704?
The maximum junction temperature of the LM2704 is 150°C.
- How does the LM2704 conserve operating current?
The LM2704 uses a current-limited, fixed off-time control scheme to conserve operating current.
- What types of applications is the LM2704 suitable for?
The LM2704 is suitable for LCD bias supplies, white LED back-lighting, digital cameras, and other portable applications requiring low current and high efficiency.
- How many white LEDs can the LM2704 drive from a single Li-Ion battery?
The LM2704 can drive up to 8 white LEDs from a single Li-Ion battery.
