Features:
• Linear charger for lithium-ion/lithium-polymer batteries
• Adjustable charge current from 20 mA to 400 mA
• Selectable termination voltage of 4.1 V or 4.2 V
• Automatic trickle, constant current, and constant voltage charging
• Battery thermal protection
• Discharge current limitation
• JEITA compliant
Li-ion/Li-polymer USB battery charger with a high efficiency buck regulator
800 nA - Typical quiescent current
460 nA - Shipping mode quiescent current
Thermal protection
Input regulator
• USB compatible current limit of 100 mA and 500 mA
• 4.1 V to 6.7 V input voltage range for normal operation
• 20 V overvoltage protection
• Reverse current protection
• 3.0 V to 5.5 V system voltage output
• USB port detection supporting the following types:
• SDP
• CDP/DCP
• 1.8 V to 3.0 V, 150 mA step-down buck regulator
• Step-down buck regulator with up to 92% efficiency
• Automatic transition between hysteretic and pulse width
modulation (PWM) modes
• Forced PWM mode for clean power operation
• Pin-selectable output voltage (1.8 V, 2.1 V, 2.7 V, 3.0 V)
• Soft start-up
• LED drivers for charger state indication
• 5 mA low side LED driver for charging indication
• 5 mA low side LED driver for error indication
• 2.3 V to 4.35 V battery operating input range
• 2.1x2.1 mm WLCSP package
• Suitable for two layer PCB design
Application
The following application example uses nPM1100 and an nRF5x wireless System on Chip (SoC). Any nRF52
or nRF53 series device with USB can be configured in the same way as this application. When using a
device without USB, or for other configurations, see Reference circuitry on page 44.
The example application is for a design with the following configuration and features:
• nPM1100 BUCK regulator supplies the nRF5x device
• USB current limit negotiation
• Charging status monitoring using SoC GPIOs
• ICHG and VTERM configuration
• NTC thermistor in the battery pack
• Ship mode
• Battery monitoring circuit and low battery indication LED (this requires the device to sample the
battery voltage; software is not described here)