Part: MP1482DS-LF-Z — Monolithic Power Systems, Inc.

Type: Synchronous Buck Regulator

Description: The MP1482 is a monolithic synchronous buck regulator that provides 2A of continuous load current over a wide input voltage of 4.75V to 18V, integrates two 130mΩ MOSFETs, and achieves up to 93% efficiency.

Operating Conditions:

• Supply voltage: 4.75V to 18V
• Operating temperature: -40°C to +125°C (Junction Temperature)
• Output voltage: 0.923V to 15V

Absolute Maximum Ratings:

• Max supply voltage: +20V
• Max continuous current: 2A
• Max junction/storage temperature: 150°C

Key Specs:

• Shutdown Supply Current: 1 μA (Typ, V EN = 0V)
• Supply Current: 1.3 mA (Typ, V EN = 2.0V; V FB = 1.0V)
• Feedback Voltage: 0.923 V (Typ, 4.75V ≤ V IN ≤ 18V)
• High-Side Switch On Resistance: 130 mΩ (Typ)
• Low-Side Switch On Resistance: 130 mΩ (Typ)
• Upper Switch Current Limit: 3.4 A (Typ, Minimum Duty Cycle)
• Oscillation Frequency: 340 kHz (Typ)
• Thermal Shutdown: 160 °C (Typ)

Features:

• 2A Output Current
• Integrated 130mΩ Power MOSFET Switches
• Wide 4.75V to 18V Operating Input Range
• Output Adjustable from 0.923V to 15V
• Up to 93% Efficiency
• Programmable Soft-Start
• Stable with Low ESR Ceramic Output Capacitors
• Fixed 340kHz Frequency
• Input Under Voltage Lockout
• Cycle-by-Cycle Over Current Protection

Applications:

• Distributed Power Systems
• FPGA, DSP, ASIC Power Supplies
• Networking Systems
• Green Electronics/ Appliances

Package:

• SOIC8

• 2A Output Current
• Integrated 130m Ω Power MOSFET Switches
• Wide 4.75V to 18V Operating Input Range
• Output Adjustable from 0.923V to 15V
• Up to 93% Efficiency
• Programmable Soft-Start
• Stable with Low ESR Ceramic Output Capacitors

An adjustable soft-start prevents inrush current at turn-on, and in shutdown mode the supply current drops to 1μA.

• Fixed 340kHz Frequency
• Input Under Voltage Lockout
• Cycle-by-Cycle Over Current Protection
• 8-Pin SOIC

• Distributed Power Systems
• FPGA, DSP, ASIC Power Supplies
• Networking Systems
• Green Electronics/ Appliances

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. 'MPS' and 'The Future of Analog IC Technology' are registered trademarks of Monolithic Power Systems, Inc.

Notebook Computers REFR TO MP1476

This device, available in an 8-pin SOIC package, provides a very compact solution with minimal external components. TYPICAL APPLICATION T RECOMMEND FOR

Part Number	Package	Top Marking	Free Air Temperature (T A )
MP1482DS *	SOIC8	MP1482DS	-40 C to +85 C

• Supply Voltage V IN ........................-0.3V to +20V
• Switch Node Voltage V SW ............................ 21V
• Boost Voltage V BS ..........V SW - 0.3V to V SW + 6V All Other Pins..................................-0.3V to +6V NEW
• Junction Temperature...............................150°C
• Continuous Power Dissipation (T A = +25°C) (2)
• SOIC8……………………………………….1.38W
• Lead Temperature ....................................260°C
• Storage Temperature .............. -65°C to +150°C
• Recommended Operating Conditions (3)
• Input Voltage V IN ............................4.75V to 18V
• Output Voltage V OUT .....................0.923V to 15V
• Operating Junct. Temp (T J )........-40°C to +125°C

ORDERING INFORMATION * For Tape & Reel, add suffix -Z (e.g. MP1482DS-Z); For RoHS Compliant Packaging, add suffix -LF (e.g. MP1482DS-LF-Z) PACKAGE REFERENCE SOIC8 ABSOLUTE MAXIMUM RATINGS (1) 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 θ JA , and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD(MAX)=(TJ(MAX)-TA)/ θ JA . 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 board. OT RECOMMENDED FOR NEW DESIGNS REFER TO MP1476

Thermal Resistance

(4)

θ

JA

θ

JC

SOIC8..................................... 90 ...... 45...

C/W

Parameter	Symbol	Condition	Min	Typ	Max	Units
Shutdown Supply Current		V EN = 0V		1	3.0	μ A
Supply Current		V EN = 2.0V; V FB = 1.0V		1.3	1.5	mA
Feedback Voltage	V FB	4.75V V IN 18V	0.9	0.923	0.946	V
Feedback Overvoltage Threshold				1.1		V
Error Amplifier Voltage Gain (5)	A EA			400		V/V
Error Amplifier Transconductance	G EA	I C = 10 μ A		800		μ A/V
High-Side Switch On Resistance (5)	R DS(ON)1			130		m Ω
Low-Side Switch On Resistance (5)	R DS(ON)2			130		m Ω
High-Side Switch Leakage Current		V EN = 0V, V SW = 0V			10	μ A
Upper Switch Current Limit		Minimum Duty Cycle	2.4	3.4		A
Lower Switch Current Limit		From Drain to Source		1.1		A
COMP to Current Sense Transconductance	GCS	DESIGNS		3.5	MP1476	A/V
Oscillation Frequency	F osc1		305	340	375	kHz
Short Circuit Oscillation Frequency	F osc2	V FB = 0V		100		kHz
Maximum Duty Cycle	D MAX	V FB = 1.0V		90		%
Minimum On Time (5)				220		ns
EN Shutdown Threshold Voltage		V EN Rising	1.1	1.5	2.0	V
EN Shutdown Threshold Voltage Hysteresis RECOMMENDED				210		mV
EN Lockout Threshold Voltage			2.2	2.5	2.7	V
EN Lockout Hysterisis				210		mV
Input Under Voltage Lockout Threshold		V IN Rising TO	3.8	4.1	4.40	V
Input Under Voltage Lockout Threshold Hysteresis	NEW			210		mV
Soft-Start Current		V SS = 0V		6		μ A
Soft-Start Period		C SS = 0.1 μ F		15		ms
Thermal Shutdown (5)				160		°C

ELECTRICAL CHARACTERISTICS VIN = 12V, TA = +25°C, unless otherwise noted. Note: 5) Guaranteed by design, not tested. OT RECOMMENDED FOR

REFER TO MP1476

SOIC8 Pin #	Name	Description
1	BS	High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET switch. Connect a 0.01 μ F or greater capacitor from SW to BS to power the high side switch.
2	IN	Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.75V to 18V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor . FOR
3	SW	Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch.
4	GND	Ground.
5	FB	Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive voltage divider from the output voltage. The feedback threshold is 0.923V. See Setting the Output Voltage .
6	COMP	Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND to compensate the regulation control loop. In some cases, an additional capacitor from COMP to GND is required. See Compensation Components.
7	EN	Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, drive it low to turn it off. Pull up with 100k Ω resistor for automatic startup.
8	SS	Soft-Start Control Input. SS controls the soft start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1 μ F capacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS unconnected.

MP1482DS-Z — SOIC8 Pinout

Pin Number	Pin Name	Type	Description
1	BS	P	Bootstrap Supply (gate drive supply for high-side MOSFET)
2	IN	P	Input Supply Voltage (4.75V to 18V)
3	SW	O	Switch Node (output of high-side MOSFET)
4	GND	P	Ground
5	FB	I	Feedback (output voltage sense)
6	COMP	O	Compensation (error amplifier output)
7	EN	I	Enable (logic input for device enable/disable)
8	SS	I	Soft Start (soft start capacitor connection)

Notes

• Bootstrap Capacitor: A capacitor (typically 0.1–1 μF) must be connected between BS and SW pins to supply the gate drive voltage for the high-side MOSFET.
• Feedback Divider: Output voltage is set via a resistive divider connected to the FB pin; nominal feedback voltage is 0.923V.
• Compensation Network: The COMP pin requires external compensation components (resistor and capacitor) to set loop stability and transient response.
• Soft Start: The SS pin connects to a capacitor to control the soft-start ramp during device startup.
• Over-Voltage Protection: When FB exceeds 20% of nominal regulation voltage (0.923V), the OVP comparator discharges COMP and SS to GND, forcing the high-side switch off.

INPUT MP1482 BS IN FB SW SS GND COMP EN 1 2 3 5 6 4 8 7 Figure 3-MP1482 with 3.3V Output, 22μF/6.3V Ceramic Output Capacitor OT RECOMMENDED FOR NEW DESIGNS REFER TO MP1476

INPUT MP1482 BS IN FB SW SS GND COMP EN 1 2 3 5 6 4 8 7 Figure 3-MP1482 with 3.3V Output, 22μF/6.3V Ceramic Output Capacitor OT RECOMMENDED FOR NEW DESIGNS REFER TO MP1476

PCB LAYOUT GUIDE PCB layout is very important to achieve stable operation. It is highly recommended to duplicate EVB layout for optimum performance. If change is necessary, please follow these guidelines and take Figure 4 for reference. 1) Keep the path of switching current short and minimize the loop area formed by input cap, high-side MOSFET and low-side MOSFET. 2) Bypass ceramic capacitors are suggested to be put close to the Vin Pin. 3) Ensure all feedback connections are short and direct. Place the feedback resistors and compensation components as close to the chip as possible. 4) Route SW away from sensitive analog areas such as FB. 5) Connect IN, SW, and especially GND respectively to a large copper area to cool the chip to improve thermal performance and long-term reliability. MP1482 Typical Application Circuit OT RECOMMENDED FOR NEW DESIGNS REFER TO MP1476

Figure 4-MP1482 Typical Application Circuit and PCB Layout Guide

NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications.