High-Efficiency, 4 A, 21 V, Synchronous
Step-Down Converter with I2C Interface
The MP8864 is a high-frequency, synchronous,
rectified, step-down, switch-mode converter
with an I2C 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 I2C 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 I2C 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.
Wide 4.5 V to 21 V Operation Input Range
50 mΩ/23 mΩ Low RDS(ON) Internal Power
1% VOUT Accuracy
I2C Programmable Reference Voltage
Range from 0.6 V to 1.87 V in 10 mV Steps
with Slew-Rate Control
I2C Selectable Switching Frequency. Default
600 kHz Switching Frequency
Programmable Output Voltage
Power-Saving Mode, OTP, and OCP via I2C
Power Good Indication
1-Bit I2C Address Set Pin
OCP in Hiccup Mode
Available in a QFN 3mm x 3mm Package
SoC and Media Processors
Distributed Power Systems
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MPS green status, please visit the MPS website under Quality Assurance.
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Monolithic Power Systems, Inc.
4.5 V-21 V
22 uF x 2
0.22 μF R4
0.1 uF L1
1.2 V/4 A
34 kΩ 47 uF
33 kΩ 34 kΩ
MP8864 Rev. 1.02
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