Ultra-Low 500nA Iq, Wide Input 2V-5.5V,
300mA Step-Down Regulator Plus300nA Iq,
The Future of Analog IC Technology
2V-5.5V Input, 100mA LDO in 2x2 QFN
The MP28300 is a monolithic power-
management unit containing 300mA, high-
efficiency, step-down, switching converters and
a 100mA LDO regulator. The nanoamp
quiescent current provides extremely high
efficiency when the load current is down in the
µA range. With minimum input voltage as low
as 2V, the MP28300 allows the system to
operate directly from the battery.
The constant-on-time control scheme provides
fast transient response, high light-load
efficiency, and requires minimal capacitance.
The regulation can be made tight by integrating
an error amplifier to correct the output voltage.
An 100mA LDO regulator provides easy system
configuration with clean output voltage.
The CTRL pins control the on/off and output
voltage selection functions.
Fault protection features include under-voltage
lockout (UVLO), over-current protection (OCP),
and thermal shutdown.
The MP28300 requires a minimal number of
readily available, standard, external
components and is available in a small QFN-12
300mA Buck Switcher
o Ultra-Low Iq: 500nA
o Wide 2.0V to 5.5V Operating Input
o 7 Selectable Output Voltages
o Up to 300mA Output Current
o 1.5MHz Switching Frequency in
Continuous Conduction Mode (CCM)
o 100% Duty Cycle in Dropout
o 0.25Ω and 0.25Ω Internal Power
o Cycle-by-Cycle Over-Current Protection
o Short-Circuit Protection (SCP) with
o Ultra-Low Iq: 300nA
o 2.0V to 5.5V Operating Input Range
o 3 Selectable Output Voltages
o Over-Temperature Protection (OTP)
Available in a QFN-12 (2mmx2mm)
All MPS parts are lead-free, halogen-free, and adhere to the RoHS
directive. For MPS green status, please visit the MPS website under
Quality Assurance. “MPS” and “The Future of Analog IC Technology” are
registered trademarks of Monolithic Power Systems, Inc.
Efficiency vs.Load Current
0.001 0.01 0.1 1 10
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