MIC24045 2 I C Programmable, 4.5V-19V Input, 5A Step-Down Converter Features General Description 2 4.5V to 19V Input Voltage Range The MIC24045 is an I C-programmable, high-effi- ciency, wide input range, 5A synchronous step-down 5A (maximum) Output Current 2 regulator. The MIC24045 is perfectly suited for multiple I C Programmable Output Voltage: voltage rail application environments, typically found in - 0.64V to 5.25V in 5 mV, 10 mV, 30 mV and computing and telecommunication systems. In the 50 mV steps MIC24045 various parameters can be programmed via 2 High Efficiency (>95%) I C, such as output voltage, switching frequency, 2 I C Programmability of: soft-start slope, margining, current limit values and start-up delays. The wide switching frequency - Soft-Start: 0.16, 0.38, 0.76 and 1.5V/ms ramp adjustment range, valley current-mode control tech- rates nique, high-performance error amplifier and external - Switching Frequency: 310 kHz, 400 kHz, compensation allow for the best trade-offs between 500 kHz, 570 kHz, 660 kHz, 780 kHz, 1 MHz, high efficiency and the smallest possible solution size. 1.2 MHz The MIC24045 supports extensive diagnostics and - Current Limits for 2A, 3A, 4A and 5A loads 2 status information through I C. - Output Voltage Margining: -5%, +5% The MIC24045 pinout is compatible with the MIC24046 - Start-up delays: 0 ms to 10 ms pin-strapping programmable regulator pinout, such that 1% Output Voltage Accuracy Over Temperature 2 I C-based implementations can be easily converted (0.64V to 1.95V) into pin-programmable ones. Supports Safe Start-Up with Pre-Biased Output 2 The MIC24045 is available in a thermally-efficient, Extensive Diagnostics through I C Interface space-saving 20-pin 3mmx3mm FQFN package, with an operating junction temperature range from Applications -40C to +125C. Servers, Data Storage, Routers and Base Stations FPGAs, DSP and Low-Voltage ASIC Power Typical Application V DDA V IN 4.5V to 19V V V A BST INLDO DDA GND V IN V OUT 0.64V to 5.25V LX P GND OUTSNS V DDP COMP MIC24045 V DDA SDA ADR1 2 I C SCL Address V DDA Selection ADR0 PGOOD PG ENABLE EN 2016 Microchip Technology Inc. DS20005568A-page 1MIC24045 Package Types MIC24045 3x3FQFN* (Top View) 20 19 18 16 17 V 15 COMP 1 21 V EP IN IN 14 V A 2 IN GND 22 P EP 13 P P 3 GND GND GND 12 P SDA 4 GND 23 LX EP 11 SCL LX 5 67 8 9 10 * Includes Exposed Thermal Pad (EP) see Table 3-1. Functional Block Diagram EN V V V BST V INLDO DDA DDP IN V EP IN Linear 2 A High-Side Regulator 10O Current Limit UVLO UVLO 1.21V Enable Reference and Comparator HS DAC Control Logic/ Gate LX REF DAC Valley Current Mode Drive LX EP UVLO Thermal Modulator VDDA ThSD, Shutdown and LS ThWrn Warning ADR0 VOUT<7:0> POR 2 ADR1 Ilim<1:0> I C P GND Interface Freq<2:0> SCL P EP GND and SS<1:0> SDA I SENSE Low-Side Registers V RANGE OUT ISense Soft- Current Start Low-Side OUTSNS Limit Current R2 Limit PG REF CLK SLOPE DAC DLY Oscillator Gm and Error Power-Good V IN Slope Amplifier Comparator OUTSNS Compensation R1 A COMP GND DS20005568A-page 2 2016 Microchip Technology Inc. LX V INLDO BST V DDP PG V DDA EN ADR0 ADR1 OUTSNS