5.5V, 1A, Synchronous Step-Down Converter
with 25μA IQ and Output Discharge
in an Ultra-Small Package
The MP2151 is a monolithic, step-down, switch-
mode converter with built-in, internal power
MOSFETs. The MP2151 achieves 1A of
continuous output current from a 2.5V to 5.5V
input voltage with excellent load and line
regulation. The output voltage can be regulated
as low as 0.6V.
The constant-on-time (COT) control scheme
provides fast transient response and eases loop
stabilization. Full protection features include
cycle-by-cycle current limiting and thermal
The MP2151 is ideal for a wide range of
applications including high-performance DSPs,
wireless power, portable and mobile devices,
and other low-power systems.
The MP2151 requires a minimal number of
readily available, standard, external
components and is available in ultra-small
SOT563 or UTQFN (1.2mmx1.6mm) packages.
Low IQ: 25μA
1.1MHz Switching Frequency
EN for Power Sequencing
1% FB Accuracy
Wide 2.5V to 5.5V Operating Input Range
Output Adjustable from 0.6V
Up to 1A Output Current
80mΩ and 50mΩ Internal Power MOSFET
100% Duty On
Output Over-Voltage Protection (OVP)
Short-Circuit Protection (SCP) with Hiccup
Power Good (PG) only for Fixed Output
Available in a SOT563 or UTQFN
Low-Voltage I/O System Power
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”, the MPS logo, and “Simple, Easy Solutions” are
trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
EN EN FB
Adjustable Output Reversion
Efficiency vs. Output Current
VIN = 5V, L1 = 1µH (DCR = 27mΩ)
MP2151 Rev. 1.0
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