MIC2168ABMM

MIC2168ABMM Datasheet

MIC2168A

Part	Datasheet
MIC2168ABMM	MIC2168ABMM (pdf)

Related Parts	Information
MIC2168ABMM-TR	MIC2168ABMM-TR

PDF Datasheet Preview
MIC2168A 1MHz PWM Synchronous Buck-Control IC The MIC2168A is a high-efficiency, simple to use 1MHz PWM synchronous buck-control IC housed in a small MSOP-10 package. The MIC2168A allows compact DC/DC solutions with a minimal external component count and cost. The MIC2168A operates from a 3V to 14.5V input, without the need of any additional bias voltage. The output voltage can be precisely regulated down to 0.8V. The adaptive all N-Channel MOSFET drive scheme allows efficiencies over 95% across a wide load range. The MIC2168A senses current across the high-side NChannel MOSFET, eliminating the need for an expensive and lossy current-sense resistor. Current limit accuracy is maintained by a positive temperature coefficient that tracks the increasing RDS ON of the external MOSFET. Further cost and space are saved by the internal in-rush-current limiting and digital softstart. The MIC2168A is identical to the MIC2168 with the exception that the MIC2168A increases the overcurrent blanking time from 80ns typ. to 120ns typ. The MIC2168A is available in a 10-pin MSOP package, with a wide junction operating range of to +125°C. All support documentation can be found on Micrel’s web site at • 3V to 14.5V input voltage range • Adjustable output voltage down to 0.8V • Up to 95% efficiency • 1MHz PWM operation • Adjustable current-limit senses high-side N-Channel MOSFET current • No external current sense resistor • Adaptive gate drive increases efficiency • Ultra-fast response with hysteretic transient recovery mode • Overvoltage protection protects the load in fault conditions • Dual mode current limit speeds up recovery time • Hiccup mode short-circuit protection • Internal soft-start • Small-size MSOP 10-pin package • Point-of-load DC/DC conversion • Set-top boxes • Graphic cards • LCD power supplies • Telecom power supplies • Networking power supplies • Cable modems and routers Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 408 944-0800 • fax + 1 408 474-1000 • January 2010 M9999-011510 Micrel Ordering Information Part Number Standard MIC2168ABMM Pb-Free MIC2168AYMM MIC2168A Frequency 1MHz Junction Temperature Range 1 to +125°C Package 10-Pin MSOP Pin Configuration VIN 1 10 BST VDD 2 9 HSD 8 VSW COMP/EN 4 FB 5 7 LSD 6 GND MIC2168A 10-Pin MSOP MM Pin Description Pin Number 1 2 Pin Name VIN VDD COMP Pin Function Supply Voltage Input 3V to 14.5V. 5V Internal Linear Regulator Output VDD is the external MOSFET gate drive supply voltage and an internal supply bus for the IC. When VIN is <5V, this regulator operates in dropout mode. Current Sense / Enable Input Current-limit comparator noninverting input. The current limit is sensed across the MOSFET during the ON time. The current can be set by the resistor in series with the CS pin. Compensation Input Dual function pin. Pin for external compensation. If this pin is pulled below 0.2V, with the reference fully up, the device shuts down 50uA typical current draw . Feedback Input to error amplifier. Regulates error amplifier to 0.8V. Ground Return . Low-Side Drive Output High-current driver output for external synchronous MOSFET. Switch Return High-side MOSFET driver return. High-Side Drive Output High-current output-driver for the high-side MOSFET. When VIN is between 3.0V to 5V, 2.5V threshold-rated MOSFETs should be used. At VIN > 5V, 5V threshold MOSFETs should be used. Boost Input Provides the drive voltage for the high-side MOSFET driver. The gate-drive voltage is higher than the source voltage by VIN minus a diode drop. January 2010 M9999-011510 Micrel MIC2168A Absolute Maximum Ratings 1 Supply Voltage VIN 15.5V Bootstrapped Voltage VBST ............................VIN +5V Junction Temperature TJ .......... TJ +125°C Storage Temperature TS to +150°C Operating Ratings 2 Supply Voltage VIN +3V to +14.5V Output Voltage Range ....................0.8V to VIN x DMAX Package Thermal Resistance 10-Pin MSOP 180°C/W Electrical Characteristics 3

PDF Datasheet Preview

MIC2168A
1MHz PWM Synchronous Buck-Control IC

The MIC2168A is a high-efficiency, simple to use 1MHz PWM synchronous buck-control IC housed in a small MSOP-10 package. The MIC2168A allows compact DC/DC solutions with a minimal external component count and cost.

The MIC2168A operates from a 3V to 14.5V input, without the need of any additional bias voltage. The output voltage can be precisely regulated down to 0.8V. The adaptive all N-Channel MOSFET drive scheme allows efficiencies over 95% across a wide load range.

The MIC2168A senses current across the high-side NChannel MOSFET, eliminating the need for an expensive and lossy current-sense resistor. Current limit accuracy is maintained by a positive temperature coefficient that tracks the increasing RDS ON of the external MOSFET. Further cost and space are saved by the internal in-rush-current limiting and digital softstart.

The MIC2168A is identical to the MIC2168 with the exception that the MIC2168A increases the overcurrent blanking time from 80ns typ. to 120ns typ.

The MIC2168A is available in a 10-pin MSOP package, with a wide junction operating range of to +125°C.

All support documentation can be found on Micrel’s web site at
• 3V to 14.5V input voltage range
• Adjustable output voltage down to 0.8V
• Up to 95% efficiency
• 1MHz PWM operation
• Adjustable current-limit senses high-side N-Channel

MOSFET current
• No external current sense resistor
• Adaptive gate drive increases efficiency
• Ultra-fast response with hysteretic transient recovery
mode
• Overvoltage protection protects the load in fault
conditions
• Dual mode current limit speeds up recovery time
• Hiccup mode short-circuit protection
• Internal soft-start
• Small-size MSOP 10-pin package
• Point-of-load DC/DC conversion
• Set-top boxes
• Graphic cards
• LCD power supplies
• Telecom power supplies
• Networking power supplies
• Cable modems and routers

Micrel Inc.
• 2180 Fortune Drive
• San Jose, CA 95131
• USA
• tel +1 408 944-0800
• fax + 1 408 474-1000
•

January 2010

M9999-011510

Micrel
Ordering Information

Part Number Standard MIC2168ABMM

Pb-Free MIC2168AYMM

MIC2168A

Frequency 1MHz

Junction Temperature Range 1 to +125°C

Package 10-Pin MSOP

Pin Configuration

VIN 1
10 BST

VDD 2
9 HSD
8 VSW

COMP/EN 4 FB 5
7 LSD 6 GND

MIC2168A 10-Pin MSOP MM

Pin Description

Pin Number 1 2

Pin Name VIN VDD

COMP

Pin Function

Supply Voltage Input 3V to 14.5V.
5V Internal Linear Regulator Output VDD is the external MOSFET gate drive supply voltage and an internal supply bus for the IC. When VIN is <5V, this regulator operates in dropout mode.

Current Sense / Enable Input Current-limit comparator noninverting input. The current limit is sensed across the MOSFET during the ON time. The current can be set by the resistor in series with the CS pin.

Compensation Input Dual function pin. Pin for external compensation. If this pin is pulled below 0.2V, with the reference fully up, the device shuts down 50uA typical current draw .

Feedback Input to error amplifier. Regulates error amplifier to 0.8V.

Ground Return .

Low-Side Drive Output High-current driver output for external synchronous MOSFET.

Switch Return High-side MOSFET driver return.

High-Side Drive Output High-current output-driver for the high-side MOSFET. When VIN is between 3.0V to 5V, 2.5V threshold-rated MOSFETs should be used. At VIN > 5V, 5V threshold MOSFETs should be used.

Boost Input Provides the drive voltage for the high-side MOSFET driver. The gate-drive voltage is higher than the source voltage by VIN minus a diode drop.

January 2010

M9999-011510

Micrel

MIC2168A

Absolute Maximum Ratings 1

Supply Voltage VIN 15.5V Bootstrapped Voltage VBST ............................VIN +5V Junction Temperature TJ .......... TJ +125°C Storage Temperature TS to +150°C

Operating Ratings 2

Supply Voltage VIN +3V to +14.5V Output Voltage Range ....................0.8V to VIN x DMAX Package Thermal Resistance
10-Pin MSOP 180°C/W

Electrical Characteristics 3

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Datasheet ID: MIC2168ABMM 647890