MIC21LV32YML-TR Microchip

SSSS MIC21LV32 36V Dual Phase, Advanced COT Buck Controller Stackable for Multiphase Operation Features General Description Input Voltage Range: 4.5V to 36V The MIC21LV32 is a constant on-time, dual phase synchronous buck controller featuring a unique adaptive Input Down to 2V when VDD = 5V from External on-time control architecture with stackable feature up to Supply eight phases. The MIC21LV32 operates over an input Adjustable Output Voltage from 0.6V to 28V supply range from 4.5V to 36V and can be used to Adaptive Constant On-Time Control: supply up to 50A of output current. The output voltage is - High DeltaV operation adjustable down to 0.6V with an ensured accuracy of - Any Capacitor stable 1%. The device operates with programmable switching frequency from 100 kHz to 1 MHz per phase. 0.6V Internal Reference with 1% Accuracy 0.5% Reference Accuracy for -40C to 105C The Hyper Speed Control architecture supports ultra- fast transient response under medium to heavy loads. Novel Ripple Injection Method to Allow Greater The soft start is also programmable externally with a than 50% Duty Cycle Operation capacitor, thus enabling safe start-ups into heavy loads. Operates in CCM, Stackable for Multiphase The MIC21LV32 has a remote sense amplifier for Operation up to Eight Phases accurate output voltage control. Accurate Current Balancing Between Phases The MIC21LV32 offers a full suite of protection features Accurate 180 Phasing of Outputs to ensure protection of the IC during Fault conditions. 100 kHz to 1 MHz Switching Frequency per Phase These include undervoltage lockout to ensure proper Secondary LDO to Improve System Efficiency operation under power sag conditions, programmable Supports Start-up to Pre-bias Output soft start to reduce inrush current, Hiccup mode Remote Sense Amplifier for Tight Output Regulation short-circuit protection and thermal shutdown. Droop Feature to Support Adaptive Voltage The MIC21LV32 is available in a 32-pin 5 mm x 5 mm Positioning (AVP) for Improved Load VQFN package with a -40C to +125C junction Transient Response operating temperature range. Precision Enable Function for Low Standby Current External Programmable Soft Start to Reduce Package Type Inrush Current MIC21LV32 Lossless R Current Sensing with NTC 32-Pin 5 mm X 5 mm VQFN* (ML) DSON Temperature Compensation or Resistor Sensing Method Programmable Current Limit and Hiccup Mode Short-Circuit Protection DH2DH2 Thermal Shutdown with Hysteresis SW2SW2 -40C to +125C Junction Temperature Range DL2DL2 Compact Size 5 mm x 5 mm 32-Pin VQFN AGAGNNDD Package ILILIMIM PGPGNNDD CSCSHH Applications ENEN Distributed Power Systems Communications/Networking Infrastructure Printers, Scanners, Graphic Cards and Video Cards FPGA, CPU, MEM, GPU Core Supplies * Includes Exposed Thermal Pad (EP) see Table 3-1. 2021 Microchip Technology Inc. DS20006513A-page 1 VDVDDD DDRROOPOOP AGAGNNDD FRFREEQQ EXTEXTVDVDDD NPNPII GFGFBB APOAPO FBFBSS ONONRR RIPRIP INJ INJ OUOUTTSS PGPG BSTBST11 BSTBST22MIC21LV32 Typical Application Circuit VDD C1 VIN VIN R1 2.2F 2.21 C2 C3 C4 PVDD D1 BST1 4.7F EXTVDD VOUT C5 DH1 EN Q1 EN R RIP INJ BIAS L1 VOUT VOUT SW1 R FB(TOP) CSP1 C FF DL1 FBS C R INJ INJ Q2 C8 C9 R FB(BOT1) DROOP PGND CSN1 RDROOP R FB(BOT2) GFB D2 MIC21LV32 VIN BST2 R FREQ FREQ C10 C11 C12 DH2 C SS SS Q3 R SW2 ILIM ILIM CSP2 L2 C13 CSH DL2 Q4 AGND CSN2 NPI APO PGND ONR R2 VDD PG 10k PG R3 VOUT OUTS 10k Application circuit based on R current sensing without temperature compensated ILIM and Droop. DSON Temperature compensation can be done using NTC resistors (refer to Section4.0 Functional Description). DS20006513A-page 2 2021 Microchip Technology Inc.