MIC24045
I2C Programmable, 4.5V-19V Input,
5A Step-Down Converter
Features
General Description
• 4.5V to 19V Input Voltage Range
• 5A (maximum) Output Current
• I2C Programmable Output Voltage:
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.
- 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
The MIC24045 supports extensive diagnostics and
status information through I2C.
- Current Limits for 2A, 3A, 4A and 5A loads
- Output Voltage Margining: -5%, +5%
- Start-up delays: 0 ms to 10 ms
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.
• ±1% Output Voltage Accuracy Over Temperature
(0.64V to 1.95V)
• Supports Safe Start-Up with Pre-Biased Output
• Extensive Diagnostics through I2C Interface
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.
Applications
• Servers, Data Storage, Routers and Base
Stations
• FPGAs, DSP and Low-Voltage ASIC Power
Typical Application
VDDA
VIN
4.5V to 19V
VINLDO
VDDA
AGND
BST
VIN
VOUT
0.64V to 5.25V
LX
OUTSNS
PGND
VDDP
COMP
ADR1
ADR0
MIC24045
VDDA
SDA
SCL
I2C
Address
Selection
VDDA
PGOOD
PG
EN
ENABLE
2016 Microchip Technology Inc.
DS20005568A-page 1