MPQ8633B
16V, 20A, Synchronous, Step-Down
Converter with Adjustable Current Limit,
Programmable Frequency, and Voltage Tracking
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MPQ8633B is a fully integrated, high-
frequency, synchronous, buck converter. It
offers a very compact solution that achieves
up to 20A of output current with excellent
load and line regulation over a wide input
supply range. The MPQ8633B operates at
high efficiency over a wide output current
load range.
Wide Input Voltage Range
o 2.7V to 16V with External 3.3V VCC
Bias
o 4V to 16V with Internal Bias or
External 3.3V VCC Bias
Differential Output Voltage Remote
Sense
Programmable Accurate Current Limit
Level
The MPQ8633B adopts an internally
20A Output Current
Low RDS(ON)
MOSFETs
compensated
constant-on-time
(COT)
Integrated
Power
control mode that provides fast transient
response and eases loop stabilization.
Proprietary Switching Loss Reduction
Technique
Adaptive COT for Ultrafast Transient
Response
Stable with Zero ESR Output Capacitor
0.5% Reference Voltage over 0°C to
+70°C Junction Temperature Range
1% Reference Voltage from -40°C to
+125°C Junction Temperature Range
Selectable Pulse Skip or Forced CCM
Operation
Excellent Load Regulation
Output Voltage Tracking
Output Voltage Discharge
PGOOD Active Clamped at Low Level
during Power Failure
Programmable Soft-Start Time from
1ms
Pre-Bias Start-Up
The operating frequency can be set to
600kHz, 800kHz, or 1000kHz easily with
MODE
configuration,
allowing
the
MPQ8633B frequency to remain constant
regardless of the input and output voltages.
The output voltage start-up ramp is
controlled by an internal 1ms timer. It can
be increased by adding a capacitor on
TRK/REF. An open-drain power good
(PGOOD) signal indicates if the output is
within its nominal voltage range. PGOOD is
clamped at around 0.7V with an external
pull-up voltage when the input supply fails
to power the MPQ8633B.
Full protection features include over-current
protection (OCP), over-voltage protection
(OVP), under-voltage protection (UVP), and
over-temperature protection (OTP).
Selectable Switching Frequency from
600kHz, 800kHz, and 1000kHz
Non-Latch OCP, UVP, UVLO, Thermal
Shutdown, and Latch-Off for OVP
Output Adjustable from 0.6V to
90%*VIN, up to 5.5V Max
The MPQ8633B requires a minimal number
of readily available, standard, external
components and is available in a QFN-21
(3mmx4mm) package.
Available in a QFN-21 (3mmx4mm)
Package
MPQ8633B Rev. 1.01
8/3/2017
www.MonolithicPower.com
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