MP28255EL-LF-Z

MP28255EL-LF-Z Datasheet

MP28255

Part	Datasheet
MP28255EL-LF-Z	MP28255EL-LF-Z (pdf)

Related Parts	Information
MP28255EL-LF-P	MP28255EL-LF-P

PDF Datasheet Preview
The Future of Analog IC Technology MP28255 21V, 4A, 500kHz Synchronous Step-down Converter The MP28255 is a high frequency synchronous rectified step-down switch mode converter with built in internal power MOSFETs. It offers a very compact solution to achieve 4A continuous output current over a wide input supply range with excellent load and line regulation. The MP28255 operates at high efficiency over a wide output current load range. Current mode operation provides fast transient response and eases loop stabilization. Full protection features include OCP and thermal shut down. The MP28255 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 • 4A Output Current • Low RDS ON Internal Power MOSFETs • Proprietary Switching Loss Reduction Technique • Fixed 500kHz Switching Frequency • External Soft-Start • Sync from 300kHz to 2MHz External Clock • Internal Compensation • Integrated Bootstrap Diode • Over-Current Protection and Hiccup • Thermal Shutdown • Output Adjustable from 0.8V • Available in 14-pin QFN3x4 Package • Networking Systems • Digital Set Top Boxes • Personal Video Recorders • Flat Panel Television and Monitors • Distributed Power Systems For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. The information in this datasheet about the product and its associated technologies are proprietary and intellectual property of Monolithic Power Systems and are protected by copyright and pending patent applications 4.5V-21V VIN PG ON/OFF 6 BST C1 22uF R3 100K 11 VCC C3 0.1uF MP28255 7 EN/SYNC 0.1uF 2uH 2,3,4,5 SW 10 SS Rt 24K C5 47nF GND AGND 12,13 14 R1 4.99K R2 10K C2 47uF 1.2V/4A 9/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. MP28255 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS Part Number* MP28255EL ORDERING INFORMATION Package 3x4 QFN14 Top Marking 28255 Free Air Temperature TA -20°C to +85°C * For Tape & Reel, add suffix e.g. For RoHS compliant packaging, add suffix e.g. PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS 1 Supply Voltage VIN VSW .........................-0.3V -5V for<10ns to 23V VBS + 6V All Other Pins................................. -0.3V to +6V Operating Temperature.............. -20°C to +85°C Continuous Power Dissipation TA = +25°C 2 Junction Temperature 150°C Lead Temperature 260°C Storage Temperature............... -65°C to +150°C Recommended Operating Conditions 3 Supply Voltage VIN 4.5V to 21V Maximum Junction Temp. TJ +125°C Thermal Resistance 4 3x4 QFN14............................. 48 °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 JESD51-7, 4-layer PCB. 9/16/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. MP28255 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS ELECTRICAL CHARACTERISTICS VIN = 12V, TA = +25°C, unless otherwise noted. Typical Values are at TA = 25°C. Parameters Symbol Condition Supply Current Shutdown Supply Current Quiescent HS Switch On Resistance LS Switch On Resistance Switch Leakage Current Limit 5 Oscillator Frequency Fold-back Frequency Maximum Duty Cycle Sync Frequency Range Feedback Voltage IIN Iq HSRDS-ON LSRDS-ON SWLKG VEN = 0V VEN = 2V, VFB = 1V VEN = 0V, VSW = 0V or 12V ILIMIT VFB = 0.75V VFB = 300mV DMAX VFB = 700mV FSYNC TA=25ºC to 85ºC 6 789 786 0 120 20 500 90 Feedback Current EN Rising Threshold EN Threshold Hysteresis EN Input Current EN Turn Off Delay Power Good Rising Threshold Power Good Falling Threshold Power Good Delay Power Good Sink Current Capability IFB VEN RISING VEN HYS

PDF Datasheet Preview

The Future of Analog IC Technology

MP28255
21V, 4A, 500kHz Synchronous Step-down Converter

The MP28255 is a high frequency synchronous rectified step-down switch mode converter with built in internal power MOSFETs. It offers a very compact solution to achieve 4A continuous output current over a wide input supply range with excellent load and line regulation. The MP28255 operates at high efficiency over a wide output current load range.

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

Full protection features include OCP and thermal shut down.

The MP28255 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
• 4A Output Current
• Low RDS ON Internal Power MOSFETs
• Proprietary Switching Loss Reduction

Technique
• Fixed 500kHz Switching Frequency
• External Soft-Start
• Sync from 300kHz to 2MHz External Clock
• Internal Compensation
• Integrated Bootstrap Diode
• Over-Current Protection and Hiccup
• Thermal Shutdown
• Output Adjustable from 0.8V
• Available in 14-pin QFN3x4 Package
• Networking Systems
• Digital Set Top Boxes
• Personal Video Recorders
• Flat Panel Television and Monitors
• Distributed Power Systems

For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc.

The information in this datasheet about the product and its associated technologies are proprietary and intellectual property of Monolithic Power Systems and are protected by copyright and pending patent applications
4.5V-21V VIN PG

ON/OFF
6 BST

C1 22uF

R3 100K
11 VCC C3 0.1uF

MP28255
7 EN/SYNC
0.1uF
2uH 2,3,4,5 SW
10 SS

Rt 24K

C5 47nF

GND AGND 12,13 14

R1 4.99K

R2 10K

C2 47uF
1.2V/4A
9/16/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2014 MPS. All Rights Reserved.

MP28255 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS

Part Number* MP28255EL
ORDERING INFORMATION

Package 3x4 QFN14

Top Marking 28255

Free Air Temperature TA -20°C to +85°C
* For Tape & Reel, add suffix e.g. For RoHS compliant packaging, add suffix e.g.

PACKAGE REFERENCE

ABSOLUTE MAXIMUM RATINGS 1

Supply Voltage VIN VSW .........................-0.3V -5V for<10ns to 23V VBS + 6V All Other Pins................................. -0.3V to +6V Operating Temperature.............. -20°C to +85°C Continuous Power Dissipation TA = +25°C 2 Junction Temperature 150°C Lead Temperature 260°C Storage Temperature............... -65°C to +150°C

Recommended Operating Conditions 3 Supply Voltage VIN 4.5V to 21V Maximum Junction Temp. TJ +125°C

Thermal Resistance 4 3x4 QFN14............................. 48 °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 JESD51-7, 4-layer PCB.
9/16/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2014 MPS. All Rights Reserved.

MP28255 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS

ELECTRICAL CHARACTERISTICS

VIN = 12V, TA = +25°C, unless otherwise noted. Typical Values are at TA = 25°C.

Parameters

Symbol Condition

Supply Current Shutdown Supply Current Quiescent HS Switch On Resistance LS Switch On Resistance

Switch Leakage Current Limit 5 Oscillator Frequency Fold-back Frequency Maximum Duty Cycle Sync Frequency Range

Feedback Voltage

IIN Iq HSRDS-ON LSRDS-ON

SWLKG

VEN = 0V VEN = 2V, VFB = 1V

VEN = 0V, VSW = 0V or 12V

ILIMIT

VFB = 0.75V

VFB = 300mV

DMAX

VFB = 700mV

FSYNC

TA=25ºC to 85ºC 6
789 786
0 120 20
500 90

Feedback Current EN Rising Threshold EN Threshold Hysteresis

EN Input Current

EN Turn Off Delay Power Good Rising Threshold Power Good Falling Threshold Power Good Delay Power Good Sink Current Capability

IFB VEN RISING VEN HYS

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MP28255EL-LF-Z Datasheet file may be downloaded here without warranties.

Datasheet ID: MP28255EL-LF-Z 650023