Overview
The LM3670MF-ADJ/NOPB, produced by Texas Instruments, is a high-efficiency step-down DC-DC switching buck converter. This device is optimized for powering ultralow voltage circuits from a single Li-Ion cell or three-cell NiMH/NiCd batteries. It features a voltage mode architecture with synchronous rectification, enabling it to deliver up to 350 mA of load current, depending on the input and output voltages and the chosen inductor.
Key Specifications
| Specification | Value |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V |
| Output Voltage Range | Adjustable (0.7 V to 3.3 V) |
| Maximum Load Current | 350 mA |
| Quiescent Current (Typical) | 15 µA |
| Shutdown Current (Typical) | 0.1 µA |
| Switching Frequency (Typical) | 1 MHz |
| Operating Modes | PWM, PFM, Shutdown |
| Package Type | SC-74A, SOT-753 |
Key Features
- High efficiency with internal synchronous rectification
- Automatic PFM and PWM mode switching for reduced current consumption and longer battery life
- Low dropout operation with 100% duty cycle mode
- Internal soft start to limit in-rush current during start-up
- Current overload protection
- Only three external components required (one inductor, two ceramic capacitors)
Applications
- Mobile phones and handheld devices
- PDAs and palm-top PCs
- Portable instruments
- Battery-powered devices
Q & A
- What is the input voltage range of the LM3670MF-ADJ/NOPB?
The input voltage range is 2.5 V to 5.5 V. - What is the maximum load current the LM3670MF-ADJ/NOPB can handle?
The maximum load current is 350 mA. - What are the operating modes of the LM3670MF-ADJ/NOPB?
The operating modes include PWM, PFM, and Shutdown. - How does the LM3670MF-ADJ/NOPB manage power consumption at light loads?
It automatically switches into PFM mode at light loads to reduce current consumption and extend battery life. - What is the typical quiescent current of the LM3670MF-ADJ/NOPB?
The typical quiescent current is 15 µA. - Does the LM3670MF-ADJ/NOPB have built-in protection features?
Yes, it includes current overload protection. - What is the switching frequency of the LM3670MF-ADJ/NOPB?
The typical switching frequency is 1 MHz. - How many external components are required for the LM3670MF-ADJ/NOPB?
Only three external components are required: one inductor and two ceramic capacitors. - What is the purpose of the soft start feature in the LM3670MF-ADJ/NOPB?
The soft start feature limits in-rush current during start-up. - In what types of devices is the LM3670MF-ADJ/NOPB commonly used?
It is commonly used in mobile phones, handheld devices, PDAs, palm-top PCs, and other portable instruments.
