SLUUD24 May 2024 BQ25770G
The NVDC configuration allows the system to be regulated at the battery voltage, but does not drop below the system minimum voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds the input source rating, the battery supplement mode prevents the input source from being overloaded.
During power up, the charger sets the converter to buck, boost, or buck-boost configuration based on the input source and battery conditions. During the charging cycle, the charger automatically transits among buck, boost, and buck-boost configuration without host control.
The BQ2577xG monitors adapter current, battery current, and system power. The flexibly programmed PROCHOT output goes directly to the CPU for throttle back, when needed.
For more details, please see the BQ2577xG: 40V, SMBus or I2C, 2- to 5-Cell, Narrow VDC Dual Phase Buck-Boost Battery Charge Controller for GaN HEMT With System Power Monitor and Processor Hot Monitor data sheet.
Table 3-1 lists the I/O descriptions.
Jack | Description |
---|---|
J1–VIN | Input: positive terminal |
J1–PGND | Input: negative terminal (ground terminal) |
J2-VSYS | Connected to system output |
J2-PGND | Ground |
J3-VBAT | Connected to battery pack output |
J3-PGND | Ground |
J4-EXT5V | Connected to external 5V supply |
J4-PGND | Ground |
J5-ILIM_HIZ | External converter disable |
J5-CHRG_OK | CHRG_OK output |
J5-EN_OTG | External OTG enable pin |
J5-CELL_control | External battery removal control; logic high to pull the CELL pin down |
J6–3V3 | Onboard 3.3V output |
J6–SDA | SMBUS or I2C SDA |
J6-SCL | SMBUS or I2C SCL |
J6-GND | Ground |
J8–SDA | SMBUS or I2C SDA |
J8-SCL | SMBUS or I2C SCL |
J8-GND | Ground |
Table 3-2 displays the controls and key parameters settings.
Jumper | Description | Factory Setting |
---|---|---|
JP1 | Jumper on: Bat removal Jumper off: Cell setting by JP4 | Not installed |
JP2 | Jumper on: Forward Mode Jumper off: OTG Mode | Installed |
JP3 | For input current setting: Jumper on: Enter HiZ mode. Jumper off: Allow pre-bias EXTLIM | Not installed |
JP4 | CELL setting: 2S: JP4(1-2), measure CELL pin voltage 2V 3S: JP4(3-4), measure CELL pin voltage 2.75V 4S: JP4(5-6), measure CELL pin voltage 3.76V 5S: JP4(7-8), measure CELL pin voltage 5V | 4S setting: JP4(5-6) |
JP5 | Jumper on: Onboard 3.3V LDO enabled Jumper off: Disconnect onboard 3.3V LDO | Installed |