MP8864
High-Efficiency, 4 A, 21 V, Synchronous
Step-Down Converter with I
2
C Interface
MP8864 Rev. 1.02 www.MonolithicPower.com 1
1/18/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
DESCRIPTION
The MP8864 is a high-frequency, synchronous,
rectified, step-down, switch-mode converter
with an I
2
C control interface. It offers a very
compact solution to achieve a 4 A continuous
output current with excellent load and line
regulation over a wide input supply range. The
MP8864 has synchronous-mode operation for
higher efficiency over the output load range.
The reference voltage level is controlled,
on-the-fly through a 3.4 Mbps I
2
C serial
interface. The voltage range can be adjusted
from 0.6 V to 1.87 V in 10 mV steps. Also, the
voltage slew rate, switching frequency, enable,
and power-saving mode are selectable through
the I
2
C interface.
Current-mode operation provides fast transient
response and eases loop stabilization. Full
protection features include over-current
protection (OCP), over-voltage protection
(OVP), and thermal shutdown (TSD).
The MP8864 requires a minimal number of
readily available, standard external components
and is available in a 15-pin QFN15
(3mm x 3mm) package.
FEATURES
Wide 4.5 V to 21 V Operation Input Range
50 mΩ/23 mΩ Low R
DS(ON)
Internal Power
MOSFETs
1% VOUT Accuracy
I
2
C Programmable Reference Voltage
Range from 0.6 V to 1.87 V in 10 mV Steps
with Slew-Rate Control
I
2
C Selectable Switching Frequency. Default
600 kHz Switching Frequency
Programmable Output Voltage
Power-Saving Mode, OTP, and OCP via I
2
C
Power Good Indication
1-Bit I
2
C Address Set Pin
OCP in Hiccup Mode
External Soft-Start
Available in a QFN 3mm x 3mm Package
APPLICATIONS
SoC and Media Processors
General Consumer
Distributed Power Systems
