MAX77812CEWB+T

EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX77812 20A User-Configurable Quad-Phase Buck Converter General Description The MAX77812 is a quad-phase high-efficiency stepdown (buck) converter capable of delivering up to 20A of maximum current. Programmable startup/shutdown sequence and user-selectable phase configurations make the MAX77812 ideal for powering the latest generations of processors. With high-efficiency and small solution size, the MAX77812 is optimized for space constrained single-cell battery powered applications. The MAX77812 uses an adaptive on-time PWM control scheme and it has SKIP and low-power SKIP modes for improved light-load efficiency. A programmable current limit reduces the overall solution footprint by optimizing inductors size. Differential sensing provides high output voltage accuracy, while enhanced transient response (ETR) allows fast output voltage adjustments to load transients. Programmable soft-start/stop and ramp-up/down slew rate provides control over an inrush current as the regulator transitions between operating states. A 3.4MHz high-speed I2C or 30MHz SPI interface with dedicated logic inputs provide full configurability and control for system power optimization. The MAX77812 is available in 3.408mm x 3.368mm, 64-bump 0.4mm pitch wafer-level package (WLP). Benefits and Features ●● 20A Maximum Output Current (5A per Phase) ●● VIN Range: 2.5V to 5.5V ●● VOUT Range: 0.250V to 1.525V with 5mV Steps ●● ±0.5% Initial Output Accuracy with Differential Sensing ●● 5 User-Selectable Phase Configurations ●● 91% Peak Efficiency (VIN = 3.8V, VOUT = 1.1V) ●● Auto (SKIP/PWM) and Forced PWM Modes ●● Enhanced Load Transient Response ●● Programmable Ramp-Up/Down Slew Rates ●● Programmable Startup/Shutdown Sequence ●● UVLO, Short-Circuit, and Thermal Protections ●● 2 User-Programmable General-Purpose Inputs ●● 3.4MHz High Speed I2C and 30MHz SPI Interface ●● 3.408mm x 3.368mm, 64-Bump WLP Package Applications ●● ●● ●● ●● CPU/GPU, FPGAs, and DSPs Power Supply AR/VR Headsets and Game Consoles Li-ion Battery Powered Equipment Space Constrained Portable Electronics Ordering Information appears at end of data sheet. Typical Application Circuit VSYS 2.5V to 5.5V VVIO VSYS 2.5V to 5.5V 19-8541; Rev 11; 12/20 IN12 SYS DGND AGND CE VIO MAX77812 MULTI-PHASE BUCK IRQB SCL SDA/MOSI MISO SCS I2C_SPI_SEL EN LPM WDTRSTB_IN GPI0 GPI1 PH_CFG0 PH_CFG1 PH_CFG2 LX1 SNS1P SNS1N PGND1 VSYS 2.5V to 5.5V 0.25V to 1.525V 10A LX2 SNS2P SNS2N PGND2 IN34 LX3 SNS3P SNS3N PGND3 LX4 SNS4P SNS4N PGND4 1Φ + 1Φ + 1Φ + 1Φ 2Φ 5A 5A 5A 5A 10A 2Φ + 1Φ + 1Φ 10A 5A 5A + VSYS 2.5V to 5.5V 2Φ 10A + 0.25V to 1.525V 5A 0.25V to 1.525V 5A 3Φ 1Φ 4Φ 15A 5A 20A PHASE-CONFIGURABLE QUAD-OUTPUT MAX77812 20A User-Configurable Quad-Phase Buck Converter Absolute Maximum Ratings SYS, VIO to AGND................................................-0.3V to +6.0V DGND to AGND.....................................................-0.3V to +0.3V SCL, SDA/MOSI, MISO, SCS, IRQB, CE, EN, LPM, GPI0, GPI1, WDTRSTB_IN to DGND...................... -0.3V to (VVIO + 0.3V) PH_CFG0, PH_CFG1, PH_CFG2, I2C_SPI_SEL to AGND....................... -0.3V to (VSYS + 0.3V) IN12, IN34 to PGNDx.............................. -0.3V to (VSYS + 0.3V) LX1/2/3/4 to PGNDx..................................-0.3V to (VIN_ + 0.3V) LX1/2/3/4 to PGNDx (Pulsed +165°C 1 TJCT_140C — 0: Junction Temperature (TJCT) ≤ +140°C 1: Junction Temperature (TJCT) > +140°C 0 TJCT_120C — 0: Junction Temperature (TJCT) ≤ +120°C 1: Junction Temperature (TJCT) > +120°C www.maximintegrated.com DESCRIPTION Maxim Integrated │  47 MAX77812 20A User-Configurable Quad-Phase Buck Converter EN_CTRL Regulator Enable Control Register ADDRESS MODE 0x06 R/W BIT NAME TYPE: O POR RESET VALUE: 0x00 DESCRIPTION 7 EN_M4_LPM 0 0: Disable BUCK Master 4 low power mode. 1: Enable BUCK Master 4 low power mode. 6 EN_M4 0 0: Disable BUCK Master 4 output. 1: Enable BUCK Master 4 output (‘OR’ logic with GPIx input). 5 EN_M3_LPM 0 0: Disable BUCK Master 3 low power mode. 1: Enable BUCK Master 3 low power mode. 4 EN_M3 0 0: Disable BUCK Master 3 output. 1: Enable BUCK Master 3 output (‘OR’ logic with GPIx input). 3 EN_M2_LPM 0 0: Disable BUCK Master 2 low power mode. 1: Enable BUCK Master 2 low power mode. 2 EN_M2 0 0: Disable BUCK Master 2 output. 1: Enable BUCK Master 2 output (‘OR’ logic with GPIx input). 1 EN_M1_LPM 0 0: Disable BUCK Master 1 low power mode. 1: Enable BUCK Master 1 low power mode. 0 EN_M1 0 0: Disable BUCK Master 1 output. 1: Enable BUCK Master 1 output (‘OR’ logic with GPIx input). STUP_DLY1 Global Startup Delay Setting Register 1 ADDRESS MODE 0x07 R/W TYPE: O (OTP) BIT NAME POR 7 DLY_STEP 0 6:5 RESERVED 00 4:0 M2_STUP_DLY[4:0] www.maximintegrated.com 0 0000 RESET VALUE: 0x00 DESCRIPTION Delay Time Step Selection 0: 1ms 1: 2ms BUCK Master 2 Startup Delay Time Setting (Delay from Rising Edge of EN Pin or GLB_EN) 0 0000b = 0ms 0 0001b = 1 x DLY_STEP 0 0010b = 2 x DLY_STEP · · · · · · 1 1110b = 30 x DLY_STEP 1 1111b = 31 x DLY_STEP Maxim Integrated │  48 MAX77812 20A User-Configurable Quad-Phase Buck Converter STUP_DLY2 Global Startup Delay Setting Register 2 ADDRESS MODE 0x08 R/W TYPE: O (OTP) BIT NAME POR 7:5 RESERVED 000 4:0 M3_STUP_DLY[4:0] 0 0000 RESET VALUE: 0x00 DESCRIPTION BUCK Master 3 Startup Delay Time Setting (Delay from Rising Edge of EN Pin or GLB_EN) 0 0000b = 0ms 0 0001b = 1 x DLY_STEP 0 0010b = 2 x DLY_STEP · · · · · · 1 1110b = 30 x DLY_STEP 1 1111b = 31 x DLY_STEP STUP_DLY3 Global Startup Delay Setting Register 3 ADDRESS MODE 0x09 R/W TYPE: O (OTP) BIT NAME POR 7:5 RESERVED 000 4:0 M4_STUP_DLY[4:0] 0 0000 RESET VALUE: 0x00 DESCRIPTION BUCK Master 4 Startup Delay Time Setting (Delay from Rising Edge of EN Pin or GLB_EN) 0 0000b = 0ms 0 0001b = 1 x DLY_STEP 0 0010b = 2 x DLY_STEP · · · · · · 1 1110b = 30 x DLY_STEP 1 1111b = 31 x DLY_STEP SHDN_DLY1 Global Shutdown Delay Setting Register 1 ADDRESS MODE 0x0A R/W TYPE: O BIT NAME POR 7:5 RESERVED 000 4:0 M1_SHDN_DLY[4:0] www.maximintegrated.com 0 0000 RESET VALUE: 0x00 DESCRIPTION BUCK Master 1 Shutdown Delay Time Setting (Delay from Falling Edge of EN Pin or GLB_EN) 0 0000b = 0ms 0 0001b = 1 x DLY_STEP 0 0010b = 2 x DLY_STEP · · · · · · 1 1110b = 30 x DLY_STEP 1 1111b = 31 x DLY_STEP Maxim Integrated │  49 MAX77812 20A User-Configurable Quad-Phase Buck Converter SHDN_DLY2 Global Shutdown Delay Setting Register 2 ADDRESS MODE 0x0B R/W TYPE: O BIT NAME POR 7:5 RESERVED 000 4:0 M2_SHDN_DLY[4:0] 0 0000 RESET VALUE: 0x00 DESCRIPTION BUCK Master 2 Shutdown Delay Time Setting (Delay from Falling Edge of EN Pin or GLB_EN) 0 0000b = 0ms 0 0001b = 1 x DLY_STEP 0 0010b = 2 x DLY_STEP · · · · · · 1 1110b = 30 x DLY_STEP 1 1111b = 31 x DLY_STEP SHDN_DLY3 Global Shutdown Delay Setting Register 3 ADDRESS MODE 0x0C R/W TYPE: O BIT NAME POR 7:5 RESERVED 000 4:0 M3_SHDN_DLY[4:0] 0 0000 RESET VALUE: 0x00 DESCRIPTION BUCK Master 3 Shutdown Delay Time Setting (Delay from Falling Edge of EN Pin or GLB_EN) 0 0000b = 0ms 0 0001b = 1 x DLY_STEP 0 0010b = 2 x DLY_STEP · · · · · · 1 1110b = 30 x DLY_STEP 1 1111b = 31 x DLY_STEP SHDN_DLY4 Global Shutdown Delay Setting Register 4 ADDRESS MODE 0x0D R/W TYPE: O BIT NAME POR 7:5 RESERVED 000 4:0 M4_SHDN_DLY[4:0] www.maximintegrated.com 0 0000 RESET VALUE: 0x00 DESCRIPTION BUCK Master 4 Shutdown Delay Time Setting (Delay from Falling Edge of EN Pin or GLB_EN) 0 0000b = 0ms 0 0001b = 1 x DLY_STEP 0 0010b = 2 x DLY_STEP · · · · · · 1 1110b = 30 x DLY_STEP 1 1111b = 31 x DLY_STEP Maxim Integrated │  50 MAX77812 20A User-Configurable Quad-Phase Buck Converter WDTRSTB_DEB WDTRSTB_IN Input Debounce Time Setting Register ADDRESS MODE 0x0E R/W TYPE: O BIT NAME POR 7:3 RESERVED 0000 0 2:0 WDT_DEB[2:0] 010 RESET VALUE: 0x02 DESCRIPTION WDTRSTB_IN Debounce Time Setting 000b = 0ms 001b = 0.8ms 010b = 1.6ms 011b = 3.2ms 100b = 6.4ms 101b = 12.8ms 111b = 51.2ms GPI_FUNC GPI Function Selection Register ADDRESS MODE 0x0F R/W BIT 7:4 3:0 NAME GPI1_FUNC[3:0] GPI0_FUNC[3:0] www.maximintegrated.com TYPE: O POR RESET VALUE: 0x43 DESCRIPTION 0100 GPI1 Function Selection 0000b: GLB_EN 1000b: M3_VSEL 0001b: M1_EN 1001b: M4_VSEL 0010b: M2_EN 1010b: GLB_LPM 0011b: M3_EN 1011b: M1_LPM 0100b: M4_EN 1100b: M2_LPM 0101b: GLB_VSEL 1101b: M3_LPM 0110b: M1_VSEL 1110b: M4_LPM 0111b: M2_VSEL 1111b: No Function 0011 GPI0 Function Selection 0000b: GLB_EN 1000b: M3_VSEL 0001b: M1_EN 1001b: M4_VSEL 0010b: M2_EN 1010b: GLB_LPM 0011b: M3_EN 1011b: M1_LPM 0100b: M4_EN 1100b: M2_LPM 0101b: GLB_VSEL 1101b: M3_LPM 0110b: M1_VSEL 1110b: M4_LPM 0111b: M2_VSEL 1111b: No Function Maxim Integrated │  51 MAX77812 20A User-Configurable Quad-Phase Buck Converter GPI_DEB1 GPI Debounce Time Setting Register 1 ADDRESS MODE 0x10 R/W BIT 7:4 3:0 NAME TYPE: O POR LPM_DEB[3:0] EN_DEB[3:0] RESET VALUE: 0x11 DESCRIPTION 0001 LPM Debounce Time Setting 0000b = 0µs 1000b = 512µs 0001b = 64µs 1001b = 576µs 0010b = 128µs 1010b = 640µs 0011b = 192µs 1011b = 704µs 0100b = 256µs 1100b = 768µs 0101b = 320µs 1101b = 832µs 0110b = 384µs 1110b = 896µs 0111b = 448µs 1111b = 960µs 0001 EN Debounce Time Setting 0000b = 0µs 1000b = 512µs 0001b = 64µs 1001b = 576µs 0010b = 128µs 1010b = 640µs 0011b = 192µs 1011b = 704µs 0100b = 256µs 1100b = 768µs 0101b = 320µs 1101b = 832µs 0110b = 384µs 1110b = 896µs 0111b = 448µs 1111b = 960µs GPI_DEB2 GPI Debounce Time Setting Register 2 ADDRESS MODE 0x11 R/W BIT 7:4 3:0 NAME GPI1_DEB[3:0] GPI0_DEB[3:0] www.maximintegrated.com TYPE: O POR RESET VALUE: 0x11 DESCRIPTION 0001 GPI1 Debounce Time Setting 0000b = 0µs 1000b = 512µs 0001b = 64µs 1001b = 576µs 0010b = 128µs 1010b = 640µs 0011b = 192µs 1011b = 704µs 0100b = 256µs 1100b = 768µs 0101b = 320µs 1101b = 832µs 0110b = 384µs 1110b = 896µs 0111b = 448µs 1111b = 960µs 0001 GPI0 Debounce Time Setting 0000b = 0µs 1000b = 512µs 0001b = 64µs 1001b = 576µs 0010b = 128µs 1010b = 640µs 0011b = 192µs 1011b = 704µs 0100b = 256µs 1100b = 768µs 0101b = 320µs 1101b = 832µs 0110b = 384µs 1110b = 896µs 0111b = 448µs 1111b = 960µs Maxim Integrated │  52 MAX77812 20A User-Configurable Quad-Phase Buck Converter GPI_PD_CTRL GPI Pulldown Resistor Control Register ADDRESS MODE 0x12 R/W TYPE: O RESET VALUE: 0x0F BIT NAME POR 7:4 RESERVED 0000 DESCRIPTION 3 LPM_PD 1 LPM Input Pulldown Resistor Enable Setting 0: Disable 1: Enable 2 EN_PD 1 EN Input Pulldown Resistor Enable Setting 0: Disable 1: Enable 1 GPI1_PD 1 GPI1 Input Pulldown Resistor Enable Setting 0: Disable 1: Enable 0 GPI0_PD 1 GPI0 Input Pulldown Resistor Enable Setting 0: Disable 1: Enable PROT_CFG Protection Configuration Register ADDRESS MODE 0x13 R/W TYPE: O BIT NAME POR 7 TSHDN_EN 1 6:3 RESERVED 000 0 2:0 UVLO_F[2:0] 010 RESET VALUE: 0x82 DESCRIPTION Thermal Protection Enable Control 0: Disable (TSHDN_INT is not disabled) 1: Enable VSYS UVLO Falling Threshold 000b = 1.95V 001b = 2.05V 010b = 2.15V 011b = 2.25V 100b = 2.35V 101b = 2.45V 110b = 2.55V 111b = Disabled 0x14: RESERVED www.maximintegrated.com Maxim Integrated │  53 MAX77812 20A User-Configurable Quad-Phase Buck Converter I2C_CFG I2C Configuration Register ADDRESS MODE 0x15 R/W TYPE: O RESET VALUE: 0x00 BIT NAME POR 7:4 RESERVED NA 3:2 RESERVED 00 Write ‘00’ 1 PAIR 0 Register Data Pair Mode 0: Disable (Sequential Mode) 1: Enable 0 HS Mode Extension 0: Disable HS mode extension (I2C Rev. 4 Compliant). 1: Enable HS mode extension. (HS mode is extended during/after ‘STOP’ condition.) 0 HS_EXT DESCRIPTION 0x16 – 0x1F: RESERVED BUCK_INT Regulators Interrupt Register ADDRESS MODE 0x20 R/C TYPE: S1 RESET VALUE: 0x00 BIT NAME POR 7:4 RESERVED 0000 DESCRIPTION 3 M4_POK_INT 0 1: BUCK Master 4 POK interrupt has triggered. 2 M3_POK _INT 0 1: BUCK Master 3 POK interrupt has triggered. 1 M2_POK _INT 0 1: BUCK Master 2 POK interrupt has triggered. 0 M1_POK _INT 0 1: BUCK Master 1 POK interrupt has triggered. BUCK_INT_M BUCK Interrupt Mask Register ADDRESS MODE 0x21 R/W TYPE: O BIT NAME POR 7:4 RESERVED 0000 3 M4_POK _M 1 0: Enable M4_POK _INT. 1: Mask M4_POK _INT. 2 M3_POK_M 1 0: Enable M3_ POK_INT. 1: Mask M3_POK_INT. 1 M2_POK_M 1 0: Enable M2_ POK_INT. 1: Mask M2_POK_INT. 0 M1_POK_M 1 0: Enable M1_POK_INT. 1: Mask M1_POK_INT. www.maximintegrated.com RESET VALUE: 0x0F DESCRIPTION Maxim Integrated │  54 MAX77812 20A User-Configurable Quad-Phase Buck Converter BUCK_STAT BUCK Status Register ADDRESS MODE 0x22 R TYPE: O RESET VALUE: N/A BIT NAME POR 7:4 RESERVED 0000 DESCRIPTION 3 M4_POK 0 BUCK Master 4 POK Status 2 M3_POK 0 BUCK Master 3 POK Status 1 M2_POK 0 BUCK Master 2 POK Status 0 M1_POK 0 BUCK Master 1 POK Status M1_VOUT BUCK Master1 Output Voltage Setting Register ADDRESS MODE 0x23 R/W TYPE: O (OTP) BIT NAME POR 7:0 M1_VOUT[7:0] 01010000 RESET VALUE: 0x50 DESCRIPTION BUCK Master 1 Output Voltage M2_VOUT BUCK Master 2 Output Voltage Setting Register ADDRESS MODE 0x24 R/W TYPE: O (OTP) BIT NAME POR 7:0 M2_VOUT[7:0] 01010000 RESET VALUE: 0x50 DESCRIPTION BUCK Master 2 Output Voltage M3_VOUT BUCK Master 3 Output Voltage Setting Register ADDRESS MODE 0x25 R/W TYPE: O (OTP) BIT NAME POR 7:0 M3_VOUT[7:0] 01000110 RESET VALUE: 0x46 DESCRIPTION BUCK Master 3 Output Voltage M4_VOUT BUCK Master 4 Output Voltage Setting Register ADDRESS MODE 0x26 R/W TYPE: O (OTP) BIT NAME POR 7:0 M4_VOUT[7:0] 01000110 www.maximintegrated.com RESET VALUE: 0x46 DESCRIPTION BUCK Master 4 Output Voltage Maxim Integrated │  55 MAX77812 20A User-Configurable Quad-Phase Buck Converter M1_VOUT_D BUCK Master 1 Default Output Voltage Setting Register ADDRESS MODE 0x27 R/W BIT 7:0 NAME TYPE: O POR M1_VOUT_D[7:0] 0111 1000 RESET VALUE: 0x78 DESCRIPTION Buck Master 1 Default Output Voltage. Sets the output voltage when DVS = 1 through a GPI. M2_VOUT_D BUCK Master 2 Default Output Voltage Setting Register ADDRESS MODE 0x28 R/W TYPE: O BIT NAME POR 7:0 M2_VOUT_D[7:0] 0111 1000 RESET VALUE: 0x78 DESCRIPTION Buck Master 2 Default Output Voltage. Sets the output voltage when DVS = 1 through a GPI. M3_VOUT_D BUCK Master 3 Default Output Voltage Setting Register ADDRESS MODE 0x29 R/W BIT 7:0 NAME TYPE: O POR M3_VOUT_D[7:0] 0111 1000 RESET VALUE: 0x78 DESCRIPTION Buck Master 3 Default Output Voltage. Sets the output voltage when DVS = 1 through a GPI. M4_VOUT_D BUCK Master 4 Default Output Voltage Setting Register ADDRESS MODE 0x2A R/W TYPE: O BIT NAME POR 7:0 M4_VOUT_D[7:0] 0111 1000 RESET VALUE: 0x78 DESCRIPTION Buck Master 4 Default Output Voltage. Sets the output voltage when DVS = 1 through a GPI. M1_VOUT_S BUCK Master1 Sleep Mode Output Voltage Setting Register ADDRESS MODE 0x2B R/W TYPE: O BIT NAME POR 7:0 M1_VOUT_S[7:0] 0001 1110 RESET VALUE: 0x1E DESCRIPTION Buck Master 1 Sleep Mode Output Voltage. Sets the output voltage when DVS = 0 through a GPI. M2_VOUT_S BUCK Master 2 Sleep Mode Output Voltage Setting Register ADDRESS MODE 0x2C R/W BIT 7:0 NAME M2_VOUT_S[7:0] www.maximintegrated.com TYPE: O POR 0001 1110 RESET VALUE: 0x1E DESCRIPTION Buck Master 2 Sleep Mode Output Voltage. Sets the output voltage when DVS = 0 through a GPI. Maxim Integrated │  56 MAX77812 20A User-Configurable Quad-Phase Buck Converter M3_VOUT_S BUCK Master 3 Sleep Mode Output Voltage Setting Register ADDRESS MODE 0x2D R/W BIT 7:0 NAME TYPE: O POR M3_VOUT_S[7:0] 0001 1110 RESET VALUE: 0x1E DESCRIPTION Buck Master 3 Sleep Mode Output Voltage. Sets the output voltage when DVS = 0 through a GPI. M4_VOUT_S BUCK Master 4 Sleep Mode Output Voltage Setting Register ADDRESS MODE 0x2E R/W TYPE: O BIT NAME POR 7:0 M4_VOUT_S[7:0] 0001 1110 RESET VALUE: 0x1E DESCRIPTION Buck Master 4 Sleep Mode Output Voltage. Sets the output voltage when DVS = 0 through a GPI. Buck Output Voltage Table 0x00 = 0.25000V 0x20 = 0.41000V 0x40 = 0.57000V 0x60 = 0.73000V 0x80 = 0.89000V 0xA0 = 1.05000V 0xC0 = 1.21000V 0xE0 = 1.37000V 0x01 = 0.25500V 0x21 = 0.41500V 0x41 = 0.57500V 0x61 = 0.73500V 0x81 = 0.89500V 0xA1 = 1.05500V 0xC1 = 1.21500V 0xE1 = 1.37500V 0x02 = 0.26000V 0x22 = 0.42000V 0x42 = 0.58000V 0x62 = 0.74000V 0x82 = 0.90000V 0xA2 = 1.06000V 0xC2 = 1.22000V 0xE2 = 1.38000V 0x03 = 0.26500V 0x23 = 0.42500V 0x43 = 0.58500V 0x63 = 0.74500V 0x83 = 0.90500V 0xA3 = 1.06500V 0xC3 = 1.22500V 0xE3 = 1.38500V 0x04 = 0.27000V 0x24 = 0.43000V 0x44 = 0.59000V 0x64 = 0.75000V 0x84 = 0.91000V 0xA4 = 1.07000V 0xC4 = 1.23000V 0xE4 = 1.39000V 0x05 = 0.27500V 0x25 = 0.43500V 0x45 = 0.59500V 0x65 = 0.75500V 0x85 = 0.91500V 0xA5 = 1.07500V 0xC5 = 1.23500V 0xE5 = 1.39500V 0x06 = 0.28000V 0x26 = 0.44000V 0x46 = 0.60000V 0x66 = 0.76000V 0x86 = 0.92000V 0xA6 = 1.08000V 0xC6 = 1.24000V 0xE6 = 1.40000V 0x07 = 0.28500V 0x27 = 0.44500V 0x47 = 0.60500V 0x67 = 0.76500V 0x87 = 0.92500V 0xA7 = 1.08500V 0xC7 = 1.24500V 0xE7 = 1.40500V 0x08 = 0.29000V 0x28 = 0.45000V 0x48 = 0.61000V 0x68 = 0.77000V 0x88 = 0.93000V 0xA8 = 1.09000V 0xC8 = 1.25000V 0xE8 = 1.41000V 0x09 = 0.29500V 0x29 = 0.45500V 0x49 = 0.61500V 0x69 = 0.77500V 0x89 = 0.93500V 0xA9 = 1.09500V 0xC9 = 1.25500V 0xE9 = 1.41500V 0x0A = 0.30000V 0x2A = 0.46000V 0x4A = 0.62000V 0x6A = 0.78000V 0x8A = 0.94000V 0xAA = 1.10000V 0xCA = 1.26000V 0xEA = 1.42000V 0x0B = 0.30500V 0x2B = 0.46500V 0x4B = 0.62500V 0x6B = 0.78500V 0x8B = 0.94500V 0xAB = 1.10500V 0xCB = 1.26500V 0xEB = 1.42500V 0x0C = 0.31000V 0x2C = 0.47000V 0x4C = 0.63000V 0x6C = 0.79000V 0x8C = 0.95000V 0xAC = 1.11000V 0xCC = 1.27000V 0xEC = 1.43000V 0x0D = 0.31500V 0x2D = 0.47500V 0x4D = 0.63500V 0x6D = 0.79500V 0x8D = 0.95500V 0xAD = 1.11500V 0xCD = 1.27500V 0xED = 1.43500V www.maximintegrated.com Maxim Integrated │  57 MAX77812 20A User-Configurable Quad-Phase Buck Converter Buck Output Voltage Table (continued) 0x0E = 0.32000V 0x2E = 0.48000V 0x4E = 0.64000V 0x6E = 0.80000V 0x8E = 0.96000V 0xAE = 1.12000V 0xCE = 1.28000V 0xEE = 1.44000V 0x0F = 0.32500V 0x2F = 0.48500V 0x4F = 0.64500V 0x6F = 0.80500V 0x8F = 0.96500V 0xAF = 1.12500V 0xCF = 1.28500V 0xEF = 1.44500V 0x10 = 0.33000V 0x30 = 0.49000V 0x50 = 0.65000V 0x70 = 0.81000V 0x90 = 0.97000V 0xB0 = 1.13000V 0xD0 = 1.29000V 0xF0 = 1.45000V 0x11 = 0.33500V 0x31 = 0.49500V 0x51 = 0.65500V 0x71 = 0.81500V 0x91 = 0.97500V 0xB1 = 1.13500V 0xD1 = 1.29500V 0xF1 = 1.45500V 0x12 = 0.34000V 0x32 = 0.50000V 0x52 = 0.66000V 0x72 = 0.82000V 0x92 = 0.98000V 0xB2 = 1.14000V 0xD2 = 1.30000V 0xF2 = 1.46000V 0x13 = 0.34500V 0x33 = 0.50500V 0x53 = 0.66500V 0x73 = 0.82500V 0x93 = 0.98500V 0xB3 = 1.14500V 0xD3 = 1.30500V 0xF3 = 1.46500V 0x14 = 0.35000V 0x34 = 0.51000V 0x54 = 0.67000V 0x74 = 0.83000V 0x94 = 0.99000V 0xB4 = 1.15000V 0xD4 = 1.31000V 0xF4 = 1.47000V 0x15 = 0.35500V 0x35 = 0.51500V 0x55 = 0.67500V 0x75 = 0.83500V 0x95 = 0.99500V 0xB5 = 1.15500V 0xD5 = 1.31500V 0xF5 = 1.47500V 0x16 = 0.36000V 0x36 = 0.52000V 0x56 = 0.68000V 0x76 = 0.84000V 0x96 = 1.00000V 0xB6 = 1.16000V 0xD6 = 1.32000V 0xF6 = 1.48000V 0x17 = 0.36500V 0x37 = 0.52500V 0x57 = 0.68500V 0x77 = 0.84500V 0x97 = 1.00500V 0xB7 = 1.16500V 0xD7 = 1.32500V 0xF7 = 1.48500V 0x18 = 0.37000V 0x38 = 0.53000V 0x58 = 0.69000V 0x78 = 0.85000V 0x98 = 1.01000V 0xB8 = 1.17000V 0xD8 = 1.33000V 0xF8 = 1.49000V 0x19 = 0.37500V 0x39 = 0.53500V 0x59 = 0.69500V 0x79 = 0.85500V 0x99 = 1.01500V 0xB9 = 1.17500V 0xD9 = 1.33500V 0xF9 = 1.49500V 0x1A = 0.38000V 0x3A = 0.54000V 0x5A = 0.70000V 0x7A = 0.86000V 0x9A = 1.02000V 0xBA = 1.18000V 0xDA = 1.34000V 0xFA = 1.50000V 0x1B = 0.38500V 0x3B = 0.54500V 0x5B = 0.70500V 0x7B = 0.86500V 0x9B = 1.02500V 0xBB = 1.18500V 0xDB = 1.34500V 0xFB = 1.50500V 0x1C = 0.39000V 0x3C = 0.55000V 0x5C = 0.71000V 0x7C = 0.87000V 0x9C = 1.03000V 0xBC = 1.19000V 0xDC = 1.35000V 0xFC = 1.51000V 0x1D = 0.39500V 0x3D = 0.55500V 0x5D = 0.71500V 0x7D = 0.87500V 0x9D = 1.03500V 0xBD = 1.19500V 0xDD = 1.35500V 0xFD = 1.51500V 0x1E = 0.40000V 0x3E = 0.56000V 0x5E = 0.72000V 0x7E = 0.88000V 0x9E = 1.04000V 0xBE = 1.20000V 0xDE = 1.36000V 0xFE = 1.52000V 0x1F = 0.40500V 0x3F = 0.56500V 0x5F = 0.72500V 0x7F = 0.88500V 0x9F = 1.04500V 0xBF = 1.20500V 0xDF = 1.36500V 0xFF = 1.52500V www.maximintegrated.com Maxim Integrated │  58 MAX77812 20A User-Configurable Quad-Phase Buck Converter M1_CFG BUCK Master 1 Configuration Register ADDRESS MODE 0x2F R/W TYPE: O BIT NAME POR 7 M1_AD 1 RESET VALUE: 0xD1 DESCRIPTION BUCK Master 1 Output Active Discharge 0: Disable 1: Enable 6:4 M1_ILIM[2:0] 101 BUCK Master 1 PMOS Peak/NMOS Valley Current Limit Setting 000b: 3.0A/2.0A 001b: 3.6A/2.4A 010b: 4.2A/2.8A 011b: 4.8A/3.2A 100b: 5.4A/3.6A 101b: 6.0A/4.0A 110b: 6.6A/4.4A 111b: 7.2A/4.8A 2:3 RESERVED 00 Write ‘00’ 0 BUCK Master 1 Forced PWM 0: Turn off Forced PWM (Automatic skip mode operation under light load) 1: Turn on Forced PWM mode 1 BUCK Master 1 Falling Slew Rate Control 0: Disable BUCK Master 1 operates in skip mode during the output voltage rampdown (only if M1_FPWM = 0). In skip mode, negative current through the low-side FET is not allowed so that the output voltage falling slew rate is a function of the output capacitance and the external load under light load condition. If the load is heavy, the output voltage falling slew rate is limited to the ramp-down slew rate set by B_RD_SR[1:0]. Note that the internal feedback string always imposes a 2µA load on the output. 1: Enable BUCK Master 1 operates in Forced PWM mode during the output voltage ramp-down. In Forced PWM mode, BUCK Master 1 can sink current from the output capacitor to ensure that the output voltage decreases at the ramp-down slew rate set by B_RD_SR[1:0]. To ensure a smooth output voltage ramp-down, Forced PMW mode remains engaged for 50µs after the output voltage decreases to its target voltage. 1 0 M1_FPWM M1_FSREN www.maximintegrated.com Maxim Integrated │  59 MAX77812 20A User-Configurable Quad-Phase Buck Converter M2_CFG BUCK Master 2 Configuration Register ADDRESS MODE 0x30 R/W TYPE: O BIT NAME POR 7 M2_AD 1 RESET VALUE: 0xD1 DESCRIPTION BUCK Master 2 Output Active Discharge 0: Disable 1: Enable 6:4 M2_ILIM[2:0] 101 BUCK Master 2 PMOS Peak/NMOS Valley Current Limit Setting 000b: 3.0A/2.0A 001b: 3.6A/2.4A 010b: 4.2A/2.8A 011b: 4.8A/3.2A 100b: 5.4A/3.6A 101b: 6.0A/4.0A 110b: 6.6A/4.4A 111b: 7.2A/4.8A 2:3 RESERVED 00 Write ‘00’ 0 BUCK Master 2 Forced PWM 0: Turn off Forced PWM (Automatic skip mode operation under light load) 1: Turn on Forced PWM mode 1 BUCK Master 2 Falling Slew Rate Control 0: Disable BUCK Master 2 operates in skip mode during the output voltage ramp-down (only if M2_FPWM = 0). In skip mode, negative current through the low-side FET is not allowed so that the output voltage falling slew rate is a function of the output capacitance and the external load under light load condition. If the load is heavy, the output voltage falling slew rate is limited to the ramp-down slew rate set by B_RD_SR[1:0]. Note that the internal feedback string always imposes a 2µA load on the output. 1: Enable BUCK Master 2 operates in Forced PWM mode during the output voltage ramp-down. In Forced PWM mode, BUCK Master 2 can sink current from the output capacitor to ensure that the output voltage decreases at the ramp-down slew rate set by B_RD_SR[1:0]. To ensure a smooth output voltage ramp-down, Forced PMW mode remains engaged for 50µs after the output voltage decreases to its target voltage. 1 0 M2_FPWM M2_FSREN www.maximintegrated.com Maxim Integrated │  60 MAX77812 20A User-Configurable Quad-Phase Buck Converter M3_CFG BUCK Master 3 Configuration Register ADDRESS MODE 0x31 R/W TYPE: O BIT NAME POR 7 M3_AD 1 RESET VALUE: 0xD1 DESCRIPTION BUCK Master 3 Output Active Discharge 0: Disable 1: Enable 6:4 M3_ILIM[2:0] 101 BUCK Master 3 PMOS Peak/NMOS Valley Current Limit Setting 000b: 3.0A/2.0A 001b: 3.6A/2.4A 010b: 4.2A/2.8A 011b: 4.8A/3.2A 100b: 5.4A/3.6A 101b: 6.0A/4.0A 110b: 6.6A/4.4A 111b: 7.2A/4.8A 2:3 RESERVED 00 Write ‘00’ 1 M3_FPWM 0 BUCK Master 3 Forced PWM 0: Turn off Forced PWM (Automatic skip mode operation under light load) 1: Turn on Forced PWM mode 1 BUCK Master 3 Falling Slew Rate Control 0: Disable BUCK Master 3 operates in skip mode during the output voltage ramp-down (only if M3_FPWM = 0). In skip mode, negative current through the low-side FET is not allowed so that the output voltage falling slew rate is a function of the output capacitance and the external load under light load condition. If the load is heavy, the output voltage falling slew rate will be limited to the ramp-down slew rate set by B_RD_SR[1:0]. Note that the internal feedback string always imposes a 2µA load on the output. 1: Enable BUCK Master 3 operates in Forced PWM mode during the output voltage ramp-down. In Forced PWM mode, BUCK Master 3 can sink current from the output capacitor to ensure that the output voltage decreases at the ramp-down slew rate set by B_RD_SR[1:0]. To ensure a smooth output voltage ramp-down, Forced PMW mode remains engaged for 50µs after the output voltage decreases to its target voltage. 0 M3_FSREN www.maximintegrated.com Maxim Integrated │  61 MAX77812 20A User-Configurable Quad-Phase Buck Converter M4_CFG BUCK Master 4 Configuration Register ADDRESS MODE 0x32 R/W TYPE: O BIT NAME POR 7 M4_AD 1 RESET VALUE: 0xD1 DESCRIPTION BUCK Master 4 Output Active Discharge 0: Disable 1: Enable 6:4 M4_ILIM[2:0] 101 BUCK Master 4 PMOS Peak/NMOS Valley Current Limit Setting 000b: 3.0A/2.0A 001b: 3.6A/2.4A 010b: 4.2A/2.8A 011b: 4.8A/3.2A 100b: 5.4A/3.6A 101b: 6.0A/4.0A 110b: 6.6A/4.4A 111b: 7.2A/4.8A 2:3 RESERVED 00 Write ‘00’ 0 BUCK Master4 Forced PWM 0: Turn off Forced PWM (Automatic skip mode operation under light load) 1: Turn on Forced PWM mode 1 BUCK Master 4 Falling Slew Rate Control 0: Disable BUCK Master 4 operates in skip mode during the output voltage rampdown (only if M4_FPWM = 0). In skip mode, negative current through the low-side FET is not allowed so that the output voltage falling slew rate is a function of the output capacitance and the external load under light load condition. If the load is heavy, the output voltage falling slew rate is limited to the ramp-down slew rate set by B_RD_SR[1:0]. Note that the internal feedback string always imposes a 2µA load on the output. 1: Enable BUCK Master 4 operates in Forced PWM mode during the output voltage ramp-down. In Forced PWM mode, BUCK Master 4 can sink current from the output capacitor to ensure that the output voltage decreases at the ramp-down slew rate set by B_RD_SR[1:0]. To ensure a smooth output voltage ramp-down, Forced PMW mode remains engaged for 50µs after the output voltage decreases to its target voltage. 1 0 M4_FPWM M4_FSREN www.maximintegrated.com Maxim Integrated │  62 MAX77812 20A User-Configurable Quad-Phase Buck Converter GLB_CFG1 BUCK Global Configuration Register 1 ADDRESS MODE 0x33 R/W TYPE: O BIT NAME POR 7 RESERVED 0 6:4 B_SD_SR[2:0] 010 3 RESERVED 0 0:2 B_SS_SR[2:0] www.maximintegrated.com 100 RESET VALUE: 0x24 DESCRIPTION Shutdown Slew Rate 000b: 1.25mV/µs 001b: 2.5mV/µs 010b: 5mV/µs 011b: 10mV/µs 100b: 20mV/µs 101b: 40mV/µs 110b: 60mV/µs 111b: 60mV/µs Soft Start Slew Rate 000b: 1.25mV/µs 001b: 2.5mV/µs 010b: 5mV/µs 011b: 10mV/µs 100b: 20mV/µs 101b: 40mV/µs 110b: 60mV/µs 111b: 60mV/µs Maxim Integrated │  63 MAX77812 20A User-Configurable Quad-Phase Buck Converter GLB_CFG2 BUCK Global Configuration Register 2 ADDRESS MODE 0x34 R/W TYPE: O BIT NAME POR 7 RESERVED 0 6:4 B_RD_SR[2:0] 010 3 RESERVED 0 0:2 B_RU_SR[2:0] www.maximintegrated.com 100 RESET VALUE: 0x24 DESCRIPTION Ramp-Down Slew Rate 000b: 1.25mV/µs 001b: 2.5mV/µs 010b: 5mV/µs 011b: 10mV/µs 100b: 20mV/µs 101b: 40mV/µs 110b: 60mV/µs 111b: 60mV/µs Ramp-Up Slew Rate 000b: 1.25mV/µs 001b: 2.5mV/µs 010b: 5mV/µs 011b: 10mV/µs 100b: 20mV/µs 101b: 40mV/µs 110b: 60mV/µs 111b: 60mV/µs Maxim Integrated │  64 MAX77812 20A User-Configurable Quad-Phase Buck Converter GLB_CFG3 BUCK Global Configuration Register 3 ADDRESS MODE 0x35 R/W TYPE: O RESET VALUE: 0x5F BIT NAME POR 7 RESERVED 0 DESCRIPTION 6 RESERVED 1 5 RESERVED 0 4 RESERVED 1 3 RESERVED 1 2 RESERVED 1 1 B_PETR_EN 1 Positive Enhanced Transient Response Control 0: Disable 1: Enable 0 B_NETR_EN 1 Negative Enhanced Transient Response Control 0: Disable 1: Enable 0x36 – 0xFF: RESERVED PCB Layout Guidelines Careful circuit board layout is critical to low-power switching losses and clean stable operation. www.maximintegrated.com For more details on PCB layout recommendations for the MAX77812, refer to Application Note 6819: MAX77812 PCB Layout Guide. Maxim Integrated │  65 MAX77812 20A User-Configurable Quad-Phase Buck Converter Simplified Block Diagram V SYS SYS 1µF DGND AGND CE 1.5kΩ x 2 VIO 100kΩ V VIO 0.1µF IN12 SBIAS, REF, UVLO, TSHDN 10µF LX1 PGND1 MAX77812 VIO LX2 PGND2 SCL SDA/ MOSI SCS I2C_ SPI_SEL ON / OFF CONTROL AND I2 C / SPI INTERFACE EN LPM GPI1 V SYS PH_CFG0 PH_CFG1 V OUT1 22µF CONSTANT ON- TIME MULTI- PHASE BUCK 0.22 µH 22µF SNS2P SNS2N IN34 10µF LX3 PGND3 V SYS 0.22 µH V OUT2 22µF SNS3P SNS3N WDTRSTB_IN GPI0 0.22 µH SNS1P SNS1N OTPs IRQB MISO V SYS MULTIFUNCTION GPIs LX4 PGND4 0.22 µH V OUT3 22µF SNS4P SNS4N PH_CFG2 www.maximintegrated.com Maxim Integrated │  66 MAX77812 20A User-Configurable Quad-Phase Buck Converter Ordering Information DEFAULT OUTPUT VOLTAGE (V) PART STARTUP DELAY TIME (ms) M3_STUP M4_STUP _DLY _DLY I2C SLAVE ADDRESS M1_VOUT M2_VOUT M3_VOUT M4_VOUT M2_STUP _DLY MAX77812EWB+T 0.650 0.650 0.600 0.600 0 0 0 0x60–0x69 MAX77812AEWB+T 0.700 0.700 0.800 1.100 0 0 2 0x60–0x69 MAX77812BEWB+T 1.120 1.120 0.920 0.950 0 0 0 0x60–0x69 MAX77812CEWB+T 0.720 1.495 0.820 0.820 5 1 3 0x60–0x69 MAX77812DEWB+T 0.720 1.200 0.900 0.750 3 6 9 0x60–0x69 MAX77812FEWB+T 0.620 1.100 0.900 1.495 0 0 0 0x70–0x79 +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 64 WLP www.maximintegrated.com PACKAGE CODE W643C3+1 OUTLINE NO. LAND PATTERN NO. 21-100087 Refer to Application Note 1891: Wafer-Level Packaging (WLP) and Its Applications Maxim Integrated │  67 MAX77812 20A User-Configurable Quad-Phase Buck Converter Revision History REVISION NUMBER REVISION DATE 0 6/16 Initial release 3/17 Updated Applications section, updated Benefits and Features section, updated MIN/TYP/MAX values in the Electrical Characteristics section and changed inductor to 220nH, DCR = 16mΩ, added Cyntec information to Table 2, added I2C slave addresses for OTP = 1 to Table 5, updated Figures 6─9 and communication protocols description, updated GPI_FUNC, M1_CFG, M2_CFG, M3_CFG, M4_CFG, GLB_CFG1, GLB_CFG2 registers in the Register Map table, updated Typical Application Circuit 6/17 Updated Benefits and Features section and Register Map table, fixed various typos 8/17 Updated title, Benefits and Features section, and Electrical Characteristics table, corrected label error to Output Voltage Error (%) in Typical Operating Characteristics, corrected errors to register name and removed error statement in HS mode in Detailed Description section, removed inductor from Table 2, corrected error in POR bits in the GPI_PD_CTRL GPI Pulldown Resistor Control Register table 1, 10, 14, 16, 26, 29, 30, 38, 51 1/18 Updated Applications and Benefits and Features sections, added Simplified Block Diagram, added LX1/2/3/4 pulsed ratings, updated Electrical Characteristics tables, updated Detailed Description section, added ALPS 220nH, removed process information 1–4, 11, 15, 26–29, 30, 31, 38, 67 5 5/18 Updated General Description, Benefits and Features, and Applications sections, renamed Typical Application Circuit and moved to page 1, updated Absolute Maximum Ratings for LXx RMS current, updated Electrical Characteristics tables, updated Typical Operating Characteristics global conditions and TOCs, updated Detailed Description sections, Table 1, Figure 2, Table 5, corrected errors in Registers information, renamed Simplified Block Diagram and updated to 2+1+1 configuration, updated Ordering Information table 1–3, 14, 16, 17, 26, 28–30, 32, 34, 35, 47–50, 59–62, 66, 67 6 7/18 Corrected typo in Electrical Characteristics table and other sections, updated Ordering Information table 1, 13, 22, 24–43, 53, 63, 65 7 6/19 Updated Table 5 and Ordering Information table 8 8/19 Updated Typical Operating Characteristics global conditions and TOCs, corrected label error to Output Voltage Error (%) in Typical Operating Characteristics, updated Output Voltage Setting section, added Enhanced Transient Response section, and added PCB Layout Guidelines section 9 9/19 Updated Typical Operating Characteristics section 1 2 3 4 www.maximintegrated.com DESCRIPTION PAGES CHANGED — 1–14, 29, 32–36, 42, 43, 49, 56, 60–66 1, 2, 4–6, 8, 11, 12, 14, 15, 23, 25, 26, 31, 33-38, 42, 43, 46-48, 62–64 32, 65 14-15, 28-29, 63 14–22 Maxim Integrated │  68 MAX77812 20A User-Configurable Quad-Phase Buck Converter Revision History (continued) REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 10 4/20 Updated Startup and Shutdown Sequence section, Phase/Output Configurations section, Multifunction GPIs General Description section, Register Map table, M1_VOUT_D, M2_VOUT_D, M3_VOUT_D, M4_VOUT_D, M1_VOUT_S, M2_VOUT_S, M3_VOUT_S, and M4_VOUT_S register descriptions, and GLB_ CFG3 BUCK Global Configuration Register 3 table; added Inductor Current Limit section and Unused Outputs section 27–28, 31–32, 45, 56–57, 65 11 12/20 Updated Absolute Maximum Ratings section, added Recommended Operating Conditions table, and updated global conditions in Electrical Characteristics tables 1–13 For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2020 Maxim Integrated Products, Inc. │  69