NCP81147 Series

Low Voltage Synchronous Buck Controller

Catalog

Low Voltage Synchronous Buck Controller

Part	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Type	Package / Case	Supplier Device Package	Clock Sync	Output Phases	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Control Features	Output Configuration	Topology	Function	Mounting Type	Synchronous Rectifier	Duty Cycle (Max)	Frequency - Switching [Max]	Frequency - Switching [Min]
ON Semiconductor NCP81147MNTXG	4.5 V	13.2 V	Transistor Driver	16-VFQFN Exposed Pad	16-QFN (3x3)		1	85 °C	-40 °C	1	Enable Frequency Control Power Good	Positive	Buck	Step-Down	Surface Mount		95 %	1 MHz	100 kHz

Catalog

Low Voltage Synchronous Buck Controller

Key Features

• Internal High Performance Operational Amplifier

• Supports 5.0 V to 19 V input

• 5.0 V to 12 v operation

• Chip enable feature through the OSC pin

• Integrated MOSFET drivers

• Guaranteed startup into pre-charged loads

• Thermal shutdown protection

• Overvoltage and over current protection

• Internal softstart / stop

• Oscillator frequency range of 100 kHz to 1000 kHz

• Power Saving Mode

• OCP accuracy, Four re-entry times before latch

• Lossless differential inductor current sensing

• Internal High precision current sensing amplifier

• 20ns Adaptive FET non-overlap time of internal Gate Driver

• Vout from 0.8V to 3.3V (5V with 12V VCC)

• Thermally compensated current monitoring

• Integrated Boost diode with internal Rbst=2.2

• Load Operation

• Sync Function

• Remote Ground Sensing

Description

The NCP81147 is a single phase solution with differential phase current sensing, synchronization input, remote ground power saving operation, and gate drivers to provide accurately regulated power. The adaptive non overlap gate drive and power saving operation circuit provide a low switching loss and high efficiency solution for server, notebook, and desktop systems. A high performance operational error amplifier is provided to simplify compensation of the system. The NCP81147 features also include softstart sequence, accurate overvoltage and over current protection, UVLO for power supply rails, and thermal shutdown.