Tool/software:
Good day,
I am currently designing a module that will be used in subsequent 3v3 devices using the bq24295 as the power management IC. This is my first time doing so please bear with me .
I am currently experiencing an issue where lower than expected current is being delivered to my battery:
Programmed 2A using RILIM -> Delivers only 700 mA. (Read using series multimeter).
Readings are usually at 700mA but upon changing multiple different power supplies, the highest ive achieved was 700mA.
I have also confirmed that the power delivery is indeed below the programmed amount by using a timing method as well as shunt in case the multimeter affected the charging.
Here are the logs for the I2C registers on the board for when the battery voltage was at 3.5V.
Additionally, I have bypassed the battery's PCM as I have read that could be a culprit for these kinds of errors.18:16:58.485 -> Voltage: 3.50
18:16:58.485 -> === BQ24295 FULL DUMP ===
18:16:58.485 -> 0x0: 0x4E
18:16:58.485 -> 0x1: 0x1B
18:16:58.485 -> 0x2: 0x5C
18:16:58.485 -> 0x3: 0x11
18:16:58.485 -> 0x4: 0xB2
18:16:58.485 -> 0x5: 0x8C
18:16:58.518 -> 0x6: 0x93
18:16:58.518 -> 0x7: 0x43
18:16:58.518 -> 0x8: 0xA5
18:16:58.518 -> 0x9: 0x0
18:16:58.518 -> 0xA: 0xC0
18:16:58.518 -> 0xB: 0xFF
18:16:58.518 -> -- decoded --
18:16:58.518 -> REG00 IINLIM code: 6
18:16:58.518 -> REG02 (ICHG raw): 0x5C
18:16:58.518 -> Programmed ICHG ≈ 1984 mA
18:16:58.518 -> ITERM ≈ 256 mA
18:16:58.518 -> VBUS status code: 2
18:16:58.518 -> CHG_STAT: Fast charge
18:16:58.518 -> DPM: NO
18:16:58.518 -> Power Good (PG): YES
18:16:58.518 -> Thermal regulation: NO
18:16:58.557 -> REG IINLIM (mA): 2000
18:16:58.557 -> Estimated RILIM limit (mA): 1995.4
18:16:58.557 -> Effective IIN limit (mA): 1995.4
18:16:58.557 -> REG09 (fault): 0x0
18:16:58.557 -> REG0B (PG_STAT / VBUS_GD): 0xFF
18:16:58.557 -> === end dump ===
I would also like to emphasize that this is my first time building a charging circuit so I could potentially have a hardware issue. I have attached my schematic as well as BOM so that the issue may be diagnosed.
Comment | Designator | Footprint | LCSC Part |
1u | C1 | Capacitor_SMD:C_0402_1005Metric | C52923 |
10u | C3,C4,C7,C19,C20 | Capacitor_SMD:C_0402_1005Metric | C15525 |
4.7u | C5 | Capacitor_SMD:C_0402_1005Metric | C23733 |
47n | C6 | Capacitor_SMD:C_0402_1005Metric | C77012 |
20u | C8 | Capacitor_SMD:C_0603_1608Metric | C86295 |
22p | C18 | Capacitor_SMD:C_0402_1005Metric | C1555 |
~ | D1 | Diode_SMD:D_0603_1608Metric | C2286 |
FerriteBead_Small | FB2 | Inductor_SMD:L_0603_1608Metric | C1002 |
JST-B2B-XH-2 | J1 | Connector_JST:JST_XH_B2B-XH-AM_1x02_P2.50mm_Vertical | C158014 |
USB_C_Receptacle | J2 | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | C2765186 |
2.2u | L2,L3 | Inductor_SMD:L_0402_1005Metric | C524917 |
10k | R1,R2,R3,R4,R5,R9 | Resistor_SMD:R_0402_1005Metric | C25744 |
5k | R6 | Resistor_SMD:R_0402_1005Metric | C477765 |
250 | R7 | Resistor_SMD:R_0603_1608Metric | C2828652 |
70.6k | R20 | Resistor_SMD:R_0603_1608Metric | C23103 |
15.1k | R21 | Resistor_SMD:R_0603_1608Metric | C22809 |
BQ24295RGER | U1 | Battery:RGE24_2P7X2P7_TEX | C165144 |
PM2.54-1*10 | U2 | Connector:HDR-TH_10P-P2.54-V-F | C5116489 |
RT8059GJ5 | U6 | Package_TO_SOT_SMD:SOT-23-5 | C20542 |
Please let me know if anything stands out from these logs and I endlessly appreciate your time and effort.
Regards,
Gavin