Overview
The LM3658SD-B/NOPB is a dual-source USB/AC lithium chemistry charger IC designed for portable applications by Texas Instruments. This integrated circuit supports charging from both USB and AC wall adapter sources, making it versatile for a wide range of portable devices. It features advanced battery management capabilities, including thermal regulation, battery temperature measurement, and multiple safety timers to ensure optimal battery health and safety.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | WSON (DSC), 10 pins |
| Input Voltage Range | −0.3V to +6.5V (CHG_IN, USBpwr) |
| Power Dissipation | Internally Limited |
| Junction Temperature (TJ-MAX) | Specified in datasheet |
| Charge Current Adjustment | Through external resistor connected to ISET pin |
| Battery Temperature Sense | Using NTC thermistors (e.g., 103AT) |
| LDO Mode Current Capability | Up to 1A source current |
| Status Indication | Two open-drain outputs (STAT1, STAT2) |
Key Features
- Constant-current, constant-voltage, sleep, top-off, and maintenance modes
- On-board Kelvin-sensing for ±0.35% termination accuracy
- Thermal regulation and battery temperature measurement
- Multiple safety timers for enhanced safety
- LDO mode operation when AC wall adapter is connected and no battery is present
- Two open-drain outputs for LED status indication or GPIO connection
- Ultra-low quiescent current in sleep mode
- Automatic recharge in maintenance mode
Applications
- Smartphones
- Digital Still Cameras
- PDAs
- Hard Drive and Flash-based MP3 Players
- USB-powered Devices
Q & A
- What is the primary function of the LM3658SD-B/NOPB? The LM3658SD-B/NOPB is a dual-source USB/AC lithium chemistry charger IC designed for charging lithium-ion batteries in portable devices.
- What types of input sources does the LM3658SD-B/NOPB support? It supports charging from both USB and AC wall adapter sources.
- How does the LM3658SD-B/NOPB manage battery temperature? It uses negative temperature coefficient (NTC) thermistors, such as the 103AT, for battery temperature measurement.
- What is LDO mode in the LM3658SD-B/NOPB? LDO mode is activated when the AC wall adapter is connected and no battery is present, allowing the IC to operate as a linear regulator capable of delivering up to 1A of source current.
- How can the charge current be adjusted in the LM3658SD-B/NOPB? The charge current can be adjusted through an external resistor connected to the ISET pin.
- What kind of status indications does the LM3658SD-B/NOPB provide? It provides two open-drain outputs (STAT1, STAT2) for LED status indication or connection to GPIOs.
- What are the key safety features of the LM3658SD-B/NOPB? It includes multiple safety timers, thermal regulation, and battery temperature measurement for enhanced safety.
- What is the package type of the LM3658SD-B/NOPB? It is available in a WSON (DSC) package with 10 pins.
- What are some typical applications of the LM3658SD-B/NOPB? Typical applications include smartphones, digital still cameras, PDAs, hard drive and flash-based MP3 players, and USB-powered devices.
- How does the LM3658SD-B/NOPB handle ultra-low power consumption? It features an ultra-low quiescent current in sleep mode to minimize power consumption.
