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IC REG BUCK ADJUSTABLE 12A 21QFN
DESCRIPTION
The MPQ8633A is a fully integrated, highfrequency, synchronous buck converter. It
offers a very compact solution to achieve up to
12A output current over a wide input supply
range with excellent load and line regulation.
The MPQ8633A operates at high efficiency
over a wide output current load range.
The MPQ8633A adopts internally compensated
constant-on-time (COT) control mode that
provides fast transient response and eases loop
stabilization.
The operating frequency is set easily to 600kHz,
800kHz, or 1000kHz with the MODE
configuration, allowing the MPQ8633A
frequency to remain constant regardless of the
input/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 the
output is within its nominal voltage range. The
PGOOD is clamped to around 0.7V with
external pull-up voltage when the input supply
fails to power the MPQ8633A.
Fully integrated protection features include overcurrent protection (OCP), over-voltage protection
(OVP), under-voltage protection (UVP), and overtemperature protection (OTP).
The MPQ8633A requires a minimum number of
readily available, standard, external components
and is available in a QFN 3mm x 4mm package.
FEATURES
Wide Input Voltage Range from 2.7V:
o 2.7V to 16V with External 3.3V VCC
Bias
o 4 V to 16V with Internal Bias or External
3.3V VCC Bias
Differential Output Voltage Remote Sense
Programmable Accurate Current Limit Level
12A Output Current
Low RDS(ON) Integrated Power MOSFETs
Proprietary Switching Loss Reduction
Technique
Adaptive COT for Ultrafast Transient
Response
Stable with Zero ESR Output Capacitor
0.5% Reference Voltage over 0C to
+70C Junction Temperature Range
1% Reference Voltage from -40C to
+125C Junction Temperature Range
Selectable Pulse Skip or Forced CCM
Operation
Excellent Load Regulation
Output Voltage Tracking
Output Voltage Discharge
PGOOD Active Clamped Low Level during
Power Failure
Programmable Soft-Start Time from 1ms
Pre-Bias Start-Up
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.
Available in a QFN 3mm x 4mm Package
APPLICATIONS
Telecom and Networking Systems
Server, Cloud-Computing, Storage
Base Stations
General Purpose Point-of-Load (PoL)
12V Distribution Power Systems
High-end TV
Game Consoles and Graphic Cards
TYPICAL APPLICATION
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