npm1300

Product overview

This chapter contains an overview of the main features found in nPM1300.

Parent topic: nPM1300 Product Specification

Block diagram

The block diagram illustrates the overall system.

Figure 1. Block diagram
Block Diagram

In-circuit configurations

The device is configurable for different applications and battery characteristics through input pins.

The following pins must be configured before power-on reset. For the full pin list, see Pin assignments.

Table 1. In-circuit configurations
Pin Function Reference
VDDIO Supply for the TWI control interface and GPIOs Interface supply, GPIO — General purpose input/output
VSET1 BUCK1 enable and VOUT1 voltage level selection at power-on reset BUCK — Buck regulators
VSET2 BUCK2 enable and VOUT2 voltage level selection at power-on reset BUCK — Buck regulators
CC1, CC2 USB charger detection (USB Type-C) USB port detection

System description

The device has the following core components that are described in detail in their respective chapters.

The system regulator (SYSREG) is supplied by VBUS. It supports 4.0 V to 5.5 V for internal functions and tolerates transient voltages up to 22 V. Overvoltage protection is implemented for both internal and external circuitry. SYSREG also implements current limiting for VBUS to comply with the USB Type-C specification. SYSREG supports Type-C charger detection.

The battery charger (CHARGER) is a JEITA compliant linear battery charger for lithium-ion (Li-ion), lithium-polymer (Li-poly), and lithium iron phosphate (LiFePO4) batteries. CHARGER controls the charge cycle using a standard Li-ion charge profile. CHARGER implements dynamic power-path management regulating current in and out of the battery, depending on system requirements, to ensure immediate system operation from VBUS if the battery is depleted. Safety features, such as battery temperature monitoring and charger thermal regulation are supported.

Two independent, highly efficient buck regulators (BUCK) supply the application circuitry and offer several output voltage options. BUCK is controlled through registers or GPIO pins. Default output voltage can be set with external resistors.

The two load switches (LOADSW/LDO) can function as switches or linear voltage regulators to complement the power distribution network. LOADSW is controlled through registers or GPIO pins.

The System Monitor provides measurements for battery voltage, battery current, VBUS, battery, and die temperature.

GPIO has the following configurable features:
  • General purpose input
  • Control input
  • Output
  • BUCK[n] control
  • LOADSW[n] control

The device also features Ship and Hibernate modes, the lowest quiescent current states. They disconnect the battery from the system and reduce the quiescent current of the device to extend battery life. Hibernate mode can be utilized during normal operation as the device can autonomously wake-up after a preconfigured timeout. This makes it possible to extend battery life to the maximum capacity.

Power-on reset (POR) and brownout reset (BOR)

The device is supplied by VBUS or VBAT.

When one of the following conditions are met, a power-on reset (POR) occurs.

When both of the following conditions are met, a brownout reset (BOR) occurs.

Supported battery types

The charger supports rechargeable Li-ion, Li-polymer, or LiFePO4 batteries.

Battery packs connected to the VBAT pin must contain the following protection circuitry:
  • Overvoltage protection
  • Undervoltage protection
  • Overcurrent discharge protection
  • Thermal fuse to protect from overtemperature (if NTC thermistor is not present)

Thermal protection

A global thermal shutdown is triggered when the die temperature exceeds the operating temperature range, see TSD. All device functions are disabled in thermal shutdown. The device functions are re-enabled when the temperature is sufficiently reduced according to a hysteresis TSDHYST.

A secondary mechanism disables the charger when the die reaches the host software programmable temperature of DIETEMPSTOP . Once this temperature is reached, charging stops but all other functionality remains active. Charging restarts when the die temperature reaches the host software programmable temperature of DIETEMPRESUME.

System efficiency

Shown here is the characterization of the power path system efficiency under different load current conditions.

In the following figure, the load current is swept from 100 nA to 200 mA and back to capture mode change hysteresis.

Figure 2. VOUT = 3.3 V system efficiency, MODE = AUTO, VIN = 3.8 V
VOUT = 3.3 V system efficiency, MODE = AUTO, VPVDD = 3.8 V

Electrical characteristics

The following graphs show quiescent current characteristics.

Figure 3. SHIP mode current vs. junction temperature
SHIP mode current vs junction temperature
Figure 4. Discharge mode current vs. junction temperature
Discharge mode current vs junction temperature

System electrical specification

Table 2. System electrical specification
Symbol Description Min. Typ. Max. Unit
IQSHIP Ship mode quiescent current   370   nA
IQSHIPT Hibernate mode quiescent current   500   nA
IQBAT Quiescent current, battery operation, no BUCK load, VBUS disconnected   800   nA
TSD Thermal shutdown threshold   120   °C
TSDHYST Thermal shutdown hysteresis   10   °C