日志
Ultra-Low 500nA Iq,Step-Down Buck Switcher 1uA低静态功耗智能穿戴DC-DC
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DESCRIPTION
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
(2mmx2mm) package.
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FEATURES
300mA Buck Switcher
o
Ultra-Low I
q
: 500nA
o
Wide 2.0V to 5.5V Operating Input
Range
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
0.25
Ω
and 0.25
Ω
Internal Power
MOSFET Switches
o
Cycle-by-Cycle Over-Current Protection
(OCP)
o
Short-Circuit Protection (SCP) with
Hiccup Mode
100mA LDO
o
Ultra-Low I
q
: 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)
Package
APPLICATIONS
Wearables
IOT
Portable Instruments
Battery-Powered Devices
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