MP38874DL-LF-Z

MP38874DL-LF-Z Datasheet

MP38874

Part	Datasheet
MP38874DL-LF-Z	MP38874DL-LF-Z (pdf)

Related Parts	Information
MP38874DL-LF-P	MP38874DL-LF-P

PDF Datasheet Preview
The Future of Analog IC Technology MP38874 8A, 21V, 600KHz Step-Down Converter with Synchronizable Gate Driver The MP38874 is a monolithic step-down switch mode converter with a built in internal power MOSFET. It achieves 8A continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. The MP38874 requires a minimum number of readily available standard external components and is available in a space saving 3mm x 4mm 14-pin QFN package. • Wide 4.5V to 21V Operating Input Range • 8A Continuous Output Current • Internal Power MOSFET Switch • Power Good Indicator • Synchronous Gate Driver Delivers up to 95% Efficiency • Fixed 600KHz Frequency • Synchronizable to >1MHz External Clock • Cycle-by-Cycle Over Current Protection • Thermal Shutdown • Output Adjustable from 0.8V to 15V • Stable with Low ESR Output Ceramic Capacitors • Available in a 3mm x 4mm 14-Pin QFN Package • Point of Load Regulator in Distributed Power System • Digital Set Top Boxes • Personal Video Recorders • Broadband Communications • Flat Panel Television and Monitors “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. 4, 5, 6 11 BST POWER GOOD 12 VCC 8, 9, 10 SW MP38874 13 BG OFF ON 3 EN/SYNC GND EFFICIENCY % Efficiency vs Output Current VIN=12V VIN=20V VOUT=3.3V 70 1 2 34 5 6 7 8 OUTPUT CURRENT A 10/13/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved. MP38874 8A, 21V, 600KHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER Part Number* MP38874DL ORDERING INFORMATION Package 3x4 QFN14 Top Marking 38874 Free Air Temperature TA to +85°C * For Tape & Reel, add suffix e.g. For RoHS compliant packaging, add suffix e.g. PACKAGE REFERENCE TOP VIEW FB 1 PG 2 EN/SYNC 3 IN 4 IN 5 IN 6 N/C 7 EXPOSED PAD ON BACKSIDE 14 GND 13 BG 12 VCC 11 BST 10 SW 9 SW 8 SW ABSOLUTE MAXIMUM RATINGS 1 Supply Voltage VIN 23V VSW........................-0.3V -5V for < 10ns to 24V VBS VSW + 6V All Other Pins to +6V Continuous Power Dissipation TA = +25°C 2 2.8W Junction Temperature ...............................150°C Lead Temperature Storage Temperature.............. to +150°C Recommended Operating Conditions 3 Supply Voltage VIN ...........................4.5V to 21V Output Voltage VOUT.........................0.8V to 15V Operating Junct. Temp TJ ...... -40°C to +125°C Thermal Resistance 4 3x4 QFN14 45 °C/W Notes 1 Exceeding these ratings may damage the device. 2 The maximum allowable power dissipation is a function of the maximum junction temperature TJ MAX , the junction-toambient thermal resistance and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3 The device is not guaranteed to function outside of its operating conditions. 4 Measured on JESD5 1-7, 4-layer PCB. 10/13/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved. MP38874 8A, 21V, 600KHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER ELECTRICAL CHARACTERISTICS VIN = 12V, TA = +25°C, unless otherwise noted. Parameters Feedback Voltage Feedback Current Switch On Resistance 5 Switch Leakage Current Limit 5 VFB IFB RDS ON Oscillator Frequency Fold-back Frequency Maximum Duty Cycle Minimum On Time 5 Under Voltage Lockout Threshold Rising Under Voltage Lockout Threshold Hysteresis EN Input Low Voltage En Input High Voltage EN Input Current Supply Current Shutdown Supply Current Quiescent Thermal Shutdown BG Driver Bias Supply Voltage Gate Driver Sink Impedance 5 Gate Driver Source Impedance 5 Gate Drive Current Sense Trip Threshold Power Good Threshold Power Good Threshold Hysteresis PG Pin Level Note 5 Guaranteed by design.

PDF Datasheet Preview

The Future of Analog IC Technology

MP38874
8A, 21V, 600KHz Step-Down Converter with Synchronizable Gate Driver

The MP38874 is a monolithic step-down switch mode converter with a built in internal power MOSFET. It achieves 8A continuous output current over a wide input supply range with excellent load and line regulation.

Current mode operation provides fast transient response and eases loop stabilization.

Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown.

The MP38874 requires a minimum number of readily available standard external components and is available in a space saving 3mm x 4mm 14-pin QFN package.
• Wide 4.5V to 21V Operating Input Range
• 8A Continuous Output Current
• Internal Power MOSFET Switch
• Power Good Indicator
• Synchronous Gate Driver Delivers up to
95% Efficiency
• Fixed 600KHz Frequency
• Synchronizable to >1MHz External Clock
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown
• Output Adjustable from 0.8V to 15V
• Stable with Low ESR Output Ceramic

Capacitors
• Available in a 3mm x 4mm 14-Pin QFN

Package
• Point of Load Regulator in Distributed Power System
• Digital Set Top Boxes
• Personal Video Recorders
• Broadband Communications
• Flat Panel Television and Monitors
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
4, 5, 6
11 BST

POWER GOOD
12 VCC
8, 9, 10 SW

MP38874
13 BG

OFF ON
3 EN/SYNC GND

EFFICIENCY %

Efficiency vs Output Current

VIN=12V

VIN=20V

VOUT=3.3V 70
1 2 34 5 6 7 8 OUTPUT CURRENT A
10/13/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2010 MPS. All Rights Reserved.

MP38874 8A, 21V, 600KHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER

Part Number* MP38874DL
ORDERING INFORMATION

Package 3x4 QFN14

Top Marking 38874

Free Air Temperature TA to +85°C
* For Tape & Reel, add suffix e.g. For RoHS compliant packaging, add suffix e.g.

PACKAGE REFERENCE

TOP VIEW

FB 1 PG 2 EN/SYNC 3 IN 4 IN 5 IN 6 N/C 7

EXPOSED PAD ON BACKSIDE
14 GND 13 BG 12 VCC 11 BST 10 SW 9 SW 8 SW

ABSOLUTE MAXIMUM RATINGS 1

Supply Voltage VIN 23V VSW........................-0.3V -5V for < 10ns to 24V VBS VSW + 6V All Other Pins to +6V Continuous Power Dissipation TA = +25°C 2
2.8W Junction Temperature ...............................150°C Lead Temperature Storage Temperature.............. to +150°C

Recommended Operating Conditions 3

Supply Voltage VIN ...........................4.5V to 21V Output Voltage VOUT.........................0.8V to 15V Operating Junct. Temp TJ ...... -40°C to +125°C

Thermal Resistance 4
3x4 QFN14 45 °C/W

Notes 1 Exceeding these ratings may damage the device. 2 The maximum allowable power dissipation is a function of the
maximum junction temperature TJ MAX , the junction-toambient thermal resistance and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3 The device is not guaranteed to function outside of its operating conditions. 4 Measured on JESD5 1-7, 4-layer PCB.
10/13/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2010 MPS. All Rights Reserved.

MP38874 8A, 21V, 600KHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER

ELECTRICAL CHARACTERISTICS

VIN = 12V, TA = +25°C, unless otherwise noted.

Parameters

Feedback Voltage

Feedback Current Switch On Resistance 5

Switch Leakage Current Limit 5

VFB IFB RDS ON

Oscillator Frequency

Fold-back Frequency

Maximum Duty Cycle

Minimum On Time 5

Under Voltage Lockout Threshold Rising

Under Voltage Lockout Threshold Hysteresis

EN Input Low Voltage

En Input High Voltage

EN Input Current

Supply Current Shutdown Supply Current Quiescent Thermal Shutdown BG Driver Bias Supply Voltage Gate Driver Sink Impedance 5 Gate Driver Source Impedance 5 Gate Drive Current Sense Trip Threshold Power Good Threshold Power Good Threshold Hysteresis PG Pin Level

Note 5 Guaranteed by design.

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Datasheet ID: MP38874DL-LF-Z 650031