Overview
The LM3658SDX-B/NOPB is a single-chip charger IC designed by Texas Instruments for handheld applications. It is capable of safely charging and maintaining a single cell Li-Ion/Polymer battery using either an AC wall adapter or a USB power source. The IC automatically selects the input power source, prioritizing the AC power source when both are present. This charger integrates internal power FETs, reverse current protection, and current sensing, making it a comprehensive solution for battery management in portable devices.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Input Voltage Range for CHG_IN | 4.5V to 6.0V | V |
| Input Voltage Range for USB_pwr | 4.35V to 6.0V | V |
| Recommended Load Current | 0 to 1000 mA | mA |
| Charge Current - Max | 1 A | A |
| Battery Pack Voltage | 4.2 V | V |
| Operating Temperature Range | -40°C to +85°C | °C |
| Junction Temperature Range | -40°C to +125°C | °C |
| Package | 10-WFDFN Exposed Pad | |
| Interface | USB | |
| Fault Protection | Over Current, Over Temperature |
Key Features
- Automatic input power source selection with AC priority
- Programmable charge current using an external resistor for AC source (50 mA to 1000 mA)
- PIN-selectable charge currents of 100 mA or 500 mA for USB power
- Internal power FETs with thermal regulation for efficient charging
- Reverse current protection and current sensing
- Operates in five modes: pre-qualification, constant-current, constant-voltage, top-off, and maintenance modes
- LDO mode operation as a linear regulator when AC wall adapter is connected and no battery is present
- Thermal regulation, battery temperature measurement, and multiple safety timers for optimal battery management
- Two open-drain outputs for LED status indication or connection to GPIOs
Applications
The LM3658SDX-B/NOPB is designed for use in handheld and portable devices that require efficient and safe Li-Ion/Polymer battery charging. Typical applications include:
- Smartphones and mobile phones
- Tablets and e-readers
- Portable media players and gaming devices
- Wearable technology such as smartwatches and fitness trackers
- Other battery-powered handheld devices
Q & A
- What is the primary function of the LM3658SDX-B/NOPB?
The primary function of the LM3658SDX-B/NOPB is to safely charge and maintain a single cell Li-Ion/Polymer battery using either an AC wall adapter or a USB power source.
- How does the IC select the input power source?
The IC automatically selects the input power source, prioritizing the AC power source when both AC and USB are present.
- What are the programmable charge current ranges for the AC source?
The charge current can be programmed using an external resistor to range from 50 mA to 1000 mA for the AC source.
- What are the PIN-selectable charge currents for USB power?
The PIN-selectable charge currents for USB power are 100 mA or 500 mA.
- What types of protection does the LM3658SDX-B/NOPB offer?
The IC offers over current and over temperature protection.
- What are the operating temperature ranges for the LM3658SDX-B/NOPB?
The operating temperature range is -40°C to +85°C, and the junction temperature range is -40°C to +125°C.
- What package type does the LM3658SDX-B/NOPB come in?
The IC comes in a 10-WFDFN Exposed Pad package.
- Does the LM3658SDX-B/NOPB have built-in thermal regulation?
Yes, the IC has built-in thermal regulation to regulate the die temperature to 120°C.
- What are the different operating modes of the LM3658SDX-B/NOPB?
The IC operates in pre-qualification, constant-current, constant-voltage, top-off, and maintenance modes, as well as LDO mode when no battery is present.
- How does the LM3658SDX-B/NOPB indicate charger status?
The IC provides two open-drain outputs (STAT1 and STAT2) for LED status indication or connection to GPIOs.
