ZHCSN76B January 2021 – April 2022 DRV8316
PRODUCTION DATA
The DRV8316R and DRV8316T has an integrated mixed-mode buck regulator in conjunction with AVDD to supply regulated 3.3 V or 5.0 V power for an external controller or system voltage rail. Additionally, the buck output can also be configured to 4.0 V or 5.7 V for supporting the extra headroom for external LDO for generating a 3.3 V or 5.0 V supplies. The output voltage of the buck is set by the VSEL_BK pin in the DRV8316T device (hardware variant) and BUCK_SEL bits in the DRV8316R device (SPI variant).
The buck regulator has a low quiescent current of ~1-2 mA during light loads to prolong battery life. The device improves performance during line and load transients by implementing a pulse-frequency current-mode control scheme which requires less output capacitance and simplifies frequency compensation design.
To disable the buck regulator, set the BUCK_DIS bit in the DRV8316R (SPI variant). The buck regulator cannot be disabled in the DRV8316T (hardware variant).
| Buck Mode | Buck output voltage | Max output current from AVDD (IAVDD) | Max output current from Buck (IBK) | Buck current limit | AVDD power sequencing |
|---|---|---|---|---|---|
| Inductor - 47 μH | 3.3 V or 4.0 V | 30 mA | 200 mA - IAVDD | 600 mA (BUCK_CL = 0b) | Not supported (BUCK_PS_DIS = 1) |
| Inductor - 47 μH | 5.0 V or 5.7 V | 30 mA | 200 mA - IAVDD | 600 mA (BUCK_CL = 0b) | Supported (BUCK_PS_DIS = 0) |
| Inductor - 22 μH | 5.0 V or 5.7 V | 30 mA | 50 mA - IAVDD | 150 mA (BUCK_CL = 1b) | Not supported (BUCK_PS_DIS = 1) |
| Inductor - 22 μH | 3.3 V or 4.0 V | 30 mA | 50 mA - IAVDD | 150 mA (BUCK_CL = 1b) | Supported (BUCK_PS_DIS = 0) |
| Resistor - 22 μH | 5.0 V or 5.7 V | 30 mA | 40 mA - IAVDD | 150 mA (BUCK_CL = 1b) | Not supported (BUCK_PS_DIS = 1) |
| Resistor - 22 μH | 3.3 V or 4.0 V | 30 mA | 40 mA - IAVDD | 150 mA (BUCK_CL = 1b) | Supported (BUCK_PS_DIS = 0) |