MIC24045 Datasheet, PDF (1/46 Pages) Microchip Technology – I2C Programmable, 4.5V-19V Input, 5A Step-Down Converter

MIC24045
I²C Programmable, 4.5V-19V Input,
5A Step-Down Converter
Features
• 4.5V to 19V Input Voltage Range
• 5A (maximum) Output Current
• I²C Programmable Output Voltage:
- 0.64V to 5.25V in 5 mV, 10 mV, 30 mV and
50 mV steps
• High Efficiency (>95%)
• I²C Programmability of:
- Soft-Start: 0.16, 0.38, 0.76 and 1.5V/ms ramp
rates
- Switching Frequency: 310 kHz, 400 kHz,
500 kHz, 570 kHz, 660 kHz, 780 kHz, 1 MHz,
1.2 MHz
- Current Limits for 2A, 3A, 4A and 5A loads
- Output Voltage Margining: -5%, +5%
- Start-up delays: 0 ms to 10 ms
• ±1% Output Voltage Accuracy Over Temperature
(0.64V to 1.95V)
• Supports Safe Start-Up with Pre-Biased Output
• Extensive Diagnostics through I²C Interface
Applications
• Servers, Data Storage, Routers and Base
Stations
• FPGAs, DSP and Low-Voltage ASIC Power
General Description
The MIC24045 is an I²C-programmable, high-effi-
ciency, wide input range, 5A synchronous step-down
regulator. The MIC24045 is perfectly suited for multiple
voltage rail application environments, typically found in
computing and telecommunication systems. In the
MIC24045 various parameters can be programmed via
I²C, such as output voltage, switching frequency,
soft-start slope, margining, current limit values and
start-up delays. The wide switching frequency
adjustment range, valley current-mode control tech-
nique, high-performance error amplifier and external
compensation allow for the best trade-offs between
high efficiency and the smallest possible solution size.
The MIC24045 supports extensive diagnostics and
status information through I²C.
The MIC24045 pinout is compatible with the MIC24046
pin-strapping programmable regulator pinout, such that
I²C-based implementations can be easily converted
into pin-programmable ones.
The MIC24045 is available in a thermally-efficient,
space-saving 20-pin 3 mm x 3 mm FQFN package,
with an operating junction temperature range from
-40°C to +125°C.
Typical Application
VIN
4.5V to 19V
I²C
PGOOD
ENABLE
VDDA
VINLDO
VIN
VDDA
AGND BST
PGND
LX
OUTSNS
VDDP
COMP
MIC24045
SDA
SCL
ADR1
ADR0
PG
EN
VOUT
0.64V to 5.25V
VDDA
Address
VDDA _Selection
 2016 Microchip Technology Inc.
DS20005568A-page 1