MP4541

– 80V, 0.8A, SYNCHRONOUS STEP-DOWN CONVERTER

MP4541 Rev. 1.0

MonolithicPower.com

3

5/28/2021

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PIN FUNCTIONS

Pin #

Name

Description

1

EN

Power enable. Pull the EN pin high to turn on the MP4541. Pull EN low to turn off the

MP4541. Do not float the EN pin.

2

VCC

Internal LDO output. VCC supplies power to the internal control circuit. Decouple VCC

with a

≥1μF ceramic capacitor.

3

FREQ

Switching frequency (fSW) setting. Connect an external resistor from the FREQ pin to

the GND pin to set the buck fSW.

4

FB

Output voltage (VOUT) feedback. Connect a resistor divider from the output to the FB

pin.

5

BST

Bootstrap power for the high-side MOSFET (HS-FET) gate driver. Connect a 0.1

μF

capacitor between the BST and SW pins.

6

SW

Switch node of the converter. Connect the SW pin to the source of the HS-FET and the

drain of the low-side MOSFET (LS-FET).

7

GND

Power ground.

8

VIN

Power supply input.

ABSOLUTE MAXIMUM RATINGS (1)

VIN, EN ....................................... -0.3V to +85V

SW .............................................. -0.5V to +85V

SW (<20ns) .................................... -5V to +88V

BST to SW ..................................... -0.3V to +6V

All other pins

……………………….. -0.3V to +6V

Continuous power dissipation (TA = 25°C)

............................................................. 3.2W (2) (4)

Junction temperature ..

…………………… 150°C

Lead temperature

………………………… 260°C

Storage temperature

………….. -65°C to +150°C

Recommended Operating Conditions (3)

Supply voltage (VIN) .…………………. 8V to 80V

Output voltage (VOUT)…………………. 1V to 30V

Operating junction temp (TJ)… -40°C to +125°C

Thermal Resistance

θJA

θJC

SOIC-8EP

EV4541-N-00A (4)

………. 38……... 7.5…..°C/W

JESD51-7 (5)

…………….. 48……... 10…...°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-to-

ambient 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) / θJA. Exceeding the maximum allowable power

dissipation can cause excessive die temperature, and the

converter may 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 the EV4541-N-00A, a 63.5mmx63.5mm, 1oz, 2-

layer PCB.

5)

The value of θ

JA given in this table is only valid for comparison

with other packages, and cannot be used for design purposes.

These values were calculated in accordance with JESD51-7,

and simulated on a specified JEDEC board. They do not

represent the performance obtained in an actual application.