MIC2185BQS

Frequency - Switching:	400kHz
Base Part Number:	MIC2185
Supplier Device Package:	16-QSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.9 V ~ 14 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Discontinued at Digi-Key
Packaging:	Tube

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MIC2185BQS Application Field and Working Principle

The MIC2185BQS is a synchronous current mode step-down DC/DC controller from Micrel Inc. It is classified under PMIC (Power Management IC) - Voltage Regulators - DC DC Switching Controllers and is used for various applications.Its main feature is its heightened flexibility provided with its internal spread spectrum clock frequency control and hardware blanking control. It has an integrated slew rate control and synchronous MOSFET gate drivers for increased efficiency and power supply rejection ratio.ApplicationsThe applications of MIC2185BQS include:• Desktop computer systems,• Notebook systems,• Telecom/networking systems,• Car audio systems,• Embedded systems,• Point-of-load applications and• Other AC/DC and DC/DC switching power supplies.FeaturesThe salient features of this controller are:• Low component count• Flexible spread spectrum clock• High efficiency synchronous rectifier• Spread spectrum increases EMI compliance • Programmable under-voltage lockout • Overvoltage protection• Oscillator soft-start• Output overvoltage protection• Overcurrent protection• High power supply rejection• Wide frequency operation• Internal blanking• Operates in diode mode for load-transient response • Improved transient response• Low-voltage start-up• Output over-voltage and under-voltage protectionWorking PrincipleThe MIC2185BQS is an integrated circuit with various complex functions integrated on the IC. This IC is mainly used to control the output voltage of a step-down DC-DC switch mode power supply circuit. It is a synchronous buck dc-dc controller.The IC contains two power MOSFETs, one on the high side and one on the low side, as well as the other analog circuitry necessary to control the operation of the circuit. The IC is used in the buck configuration such that the 4.5V to 38V of the input voltage is stepped down to the required regulated output voltage of 1.2V to 32V.The main components involved in the design of a DC/DC step-down converter using this controller IC are the transformer, filter capacitor, coil, MOSFETS, feedback resister and the IC. The working principle primarily involves the controller IC controlling the gating pulses to the MOSFETs to convert the input voltage to the required output voltage.The IC sends gate signals to MOSFETs at a constant synchronous frequency. The duty cycle of the gate signal determines the voltage at the output. The controller IC adjusts the duty cycle on its own according to the voltage or current level at the output.The feedback resister ensures the output voltage is tapped from the output of the power supply and fed back to the controller IC. The controller IC compares the output voltage with an internal reference voltage and adjusts the duty cycle accordingly to maintain the output voltage constant.ConclusionThe MIC2185BQS is an integrated synchronous buck DC/DC controller IC intended for use in various step-down DC-DC switching power supplies applications. It provides a low component count, high efficiency, and improved transient response. Its internal spread spectrum clock frequency control and hardware blanking control feature adds to its flexibility. The programmed under-voltage lockout, overvoltage protection and output overvoltage and under-voltage protection further add to its value as an efficient, cost-effective solution for various power supply applications.

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