MP8848GD-P

MP8848 6A, High-Efficiency, Synchronous, Step-Down Switcher with I2C Interface NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 DESCRIPTION FEATURES The MP8848 is a highly integrated, highfrequency, synchronous, step-down switcher with an I2C control interface. The MP8848 can support up to 6A of load current over an input supply range from 2.7V to 6V with excellent load and line regulation. • • • Constant-frequency hysteretic mode provides an extremely fast transient response without loop compensation to achieve high efficiency easily under light-load condition. The output voltage level can be controlled onthe-fly through a 3.4Mbps I2C serial interface. The voltage range can be adjusted from 0.6V to 1.235V in 5mV steps. The voltage slew rate, switching frequency, and power-saving mode are also selectable through the I2C interface. Full protection features include internal soft start, over-current protection (OCP), and overtemperature protection (OTP). The MP8848 requires a minimal number of readily available, standard, external components and is available in a compact QFN-15 (2mmx3mm) package. • • • • • • • • 2.7V to 6V Input Voltage Range Up to 6A Load Current Internal 32mΩ High-Side and 15mΩ LowSide Power MOSFETs I2C-Compatible Interface up to 3.4Mbps I2C-Programmable Output Range from 0.6V to 1.235V in 5mV Steps Factory Adjustable Switching Frequency from 0.85MHz to 2.2MHz Power-Saving Mode Selectable via I2C Internal 1ms Soft Start Power Good Indicator Current Overload and Thermal Shutdown Protection Available in a QFN-15 (2mmx3mm) Package APPLICATIONS • • Processor Core Supplies Micro Converters All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP8848 Rev. 1.0 2/16/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 1 MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I2C NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 ORDERING INFORMATION Part Number* MP8848GD Package QFN-15 (2mmx3mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP8848GD–Z) TOP MARKING AVV: Product code of MP8848GD Y: Year code WW: Week code LLL: Lot number PACKAGE REFERENCE TOP VIEW AVIN 14 SCL 13 PG 1 12 VOUT SDA 2 11 AGND GND 3 VIN 4 VIN 5 15 6 7 VIN SW 10 EN 9 SW 8 SW QFN-15 (2mmx3mm) MP8848 Rev. 1.0 2/16/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 2 MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I2C NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 θJA θJC ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance Supply voltage (VIN) ........................ -0.3V to 7V VSW ............................... -0.3V (-5V for 110% of target output) MP8848 Rev. 1.0 2/16/2017 PG Low Low Low Low High Low Low REGULATION Off Off On Off On Off On LATCH-OFF No N/A No Yes No Yes No www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. STATUS BIT OVP UVLO OTW N/A ILIM VoUV VoOV 14 MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I2C NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 BLOCK DIAGRAM VIN AVIN AVIN PG UVLO & Power Status Control EN Clock PLL AVIN SCL SDA I2C IF & Registers Clock DAC PWM + SS + _ VOUT Diff. Amp Driver & Control + SW GND AGND Ramp Figure 1: Functional Block Diagram MP8848 Rev. 1.0 2/16/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 15 MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I2C NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 Soft Start (SS) OPERATION The MP8848 has a built-in soft start that ramps The MP8848 is a low-voltage, 6A, synchronous, 2 up the output voltage at a controlled slew rate, step-down converter with a controllable I C preventing inrush current and output voltage interface. The MP8848 applies MPS’s patented overshoot at start-up. The soft-start time is constant-frequency hysteretic control to utilize about 1ms. fast transient response of the hysteretic control and keep the switching frequency constant. No Power Good (PG) Indicator compensation is required, which simplifies the The MP8848 has an open-drain output for design procedure. power good (PG) indication. When the output voltage is within ±10% of the regulation voltage, The MP8848 integrates an I2C-compatible PG is pulled up to VIN by the external resistor. interface that allows transfers of up to 3.4Mbps. This communication interface can be used for Current Limit dynamic voltage scaling with voltage steps The MP8848 has a typical 11A current limit for down to 5mV with the output voltage from 0.6V the high-side switch. When the high-side switch to 1.235V. The voltage transition slew rate can reaches the current limit, the MP8848 expands be controlled as well. the minimum off time until the current drops to Light-Load Operation 5.8A before the high-side switch is turned on for the next switching cycle. This prevents the In light-load condition, the MP8848 uses a inductor current from continuing to build up and proprietary control scheme to save power and damaging the components. improve efficiency. The MP8848 turns off the low-side switch when the inductor current Thermal Protection begins reversing. The MP8848 then works in The MP8848 employs thermal shutdown by discontinuous conduction mode (DCM) monitoring the junction temperature of the IC operation. internally. If the junction temperature exceeds Enable (EN) the thermal warning threshold (around 130°C), OTW is set. If there is no action or response When the input voltage is greater than the from the system, the junction temperature under-voltage lockout (UVLO) threshold continues rising until it exceeds the thermal (typically 2.55V), the MP8848 can be enabled shutdown threshold (typically 150°C). After by pulling EN above 1.8V. Pull EN down to thermal shutdown, a new power start-up cycle ground to disable the MP8848. The IC can also is needed to turn on the MP8848 again. be disabled by floating EN. There is an internal 1MΩ resistor from EN to ground. MP8848 Rev. 1.0 2/16/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 16 MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I2C NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 Output Voltage Select I C INTERFACE The MP8848 output voltage is I2CThe MP8848 can communicate with the core programmable. There is no need to set and the I2C for smart design. MPS has a GUI feedback resistors to achieve different output control interface (see Figure 2). The installation voltages. The default output voltage is 0.94V process and usage can be found in the MP884x but can be set from 0.6V to 1.235V in 5mV Family Software Guide. steps via the I2C. To change the output voltage, 2 I C Address write the Go bit (Reg03 Syscntlreg2 [D5]) to 1. The I2C slave address of the MP8848 is This action means that the output voltage can 0xC0H/0xC1H internally (see Table 2). If other be set to another value that is not the default Vo slave addresses are needed, please contact the voltage. Then write the Output Reference bit factory. (Reg01 VSEL [D6:D0]). The output voltage can be changed according to Table 1. Table 2: I2C Slave Address 2 Hex W 0xC0 R 0xC1 Address A7 A6 A5 A4 A3 A2 A1 A0 1 1 0 0 0 0 0 R/W 0x60 I2C Enable The MP8848’s EN pin can start up and shut down the converter, and the I2C EN pin can control the converter as well. The Reg01 VSEL D7 bit is I2C-controlled enabled. When writing D7 = 0, the converter is off. When writing D7 = 1, the converter is on. Both the external EN and I2C EN can control the converter. The converter works only when both EN pins are high. To guarantee a normal output voltage, the input voltage is suggested to be 1.5V higher than the pre-set output voltage. Switching Frequency The default switching frequency of the MP8848 is 1.25MHz. However, the frequency can also be changed based on the application. By writing the Switching Frequency bits (Reg02 SysCntlreg1 [D7:D5], the switching frequency can be programmed to one of six possible values. Their corresponding data can be found in Reg02 SysCntlreg1. Figure 2: MP884x Family Control Interface MP8848 Rev. 1.0 2/16/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 17 MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I2C NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 PG Configuration Output Voltage Transition Slew Rate The MP8848 has an option to use the When the output voltage switches from low to PG_LOHI function. This function can be written high or from high to low, the transition slew rate in the PG_LOHI bit (Reg02 Syscntlreg1 [D2]). can differ. There are two possible values for The default value is 1, where PG senses both a selection. Through writing the Slew Rate bits positive and negative excursion of Vo from the (Reg03 Syscntlreg2 D2), the transition slew rate reference. If writing this bit to 0, PG only senses can be set at one possible value based on the a negative voltage excursion of Vo from the application. The internal reference follows the reference. set slew rate, but the output voltage slew rate does not always follow the internal reference. Input Over-Voltage Protection (OVP) Considering the output capacitor and inductor, The MP8848 has an option to use the the actual output voltage slew rate should be a VIN_OVP function. This function can be written little slower. in the VIN_OVP bit (Reg02 Syscntlreg1 [D1]). AVIN Multi-Use The default value is 0, where the VIN_OVP function is enabled. When VIN is higher than The MP8848’s AVIN pin has multi-usage. When 6.3V, the converter is disabled. After VIN the P3 Enable bit (Reg03 SysCntlreg2 D1) is 0, recovers to 6.2V, the converter restarts. If the AVIN is an internal analog supply. When the P3 VIN_OVP bit is set to 1, VIN OVP is disabled. Control bit (Reg03 sysCntlrge2 D1) is 1, the P3 The converter will not stop, even if VIN exceeds voltage is controlled by the P3 Set bit (Reg03 its safe range. sysCntlrge2 D0). The P3 voltage is high if D0 = 0; otherwise, the P3 voltage is low (see Table Forced Continuous Conduction Mode (CCM) 3). The MP8848 has auto-pulse-frequency Table 3: AVIN Multi-Use modulation (PFM) mode and forced continuous D1 D0 AVIN conduction mode (CCM). This function can be 0 0 written in the Mode bit (Reg02 Syscntlreg1 Internal analog supply 0 1 [D0]). The default value is 0, where auto-PFM 1 0 Forced to 1 mode is selected. Considering a smaller Vo 1 1 Forced to 0 ripple and regulation for a full load range, forced 2 CCM is recommended. Set this bit to 1 to I C Register Hold On disable PFM mode. The MP8848 has a special function: the I2C Output Discharge register can hold on after EN changes low. The updated register can be held for later The MP8848 has an output discharge function. application conditions, even if the external EN Writing the Out-dis bit (Reg03 SysCntlreg2 [D4]) pulls low. can change the output discharge mode. The default value is 1. Discharge the internal Vo resistance when EN is low. Writing D4 = 1 can enable the function, and then the output voltage can be discharged by the internal pull-down resistance. MP8848 Rev. 1.0 2/16/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 18 MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I2C NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 TYPICAL APPLICATION CIRCUITS Figure 3: Application Circuit MP8848 Rev. 1.0 2/16/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 19 MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I2C NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8847 PACKAGE INFORMATION QFN-15 (2mmx3mm) PIN 1 ID PIN 1 ID MARKING PIN 1 ID INDEX AREA BOTTOM VIEW TOP VIEW SIDE VIEW 0.10X45º NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) LEAD COPLANARITY SHALL BE 0.10 MILLIMETERS MAX. 3) JEDEC REFERENCE IS MO-220. 4) DRAWING IS NOT TO SCALE. RECOMMENDED LAND PATTERN NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP8848 Rev. 1.0 2/16/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 20