MP3435

19A, 600kHz, 22V Output Range,

Synchronous Boost Converter

with Input Disconnect Function

MP3435 Rev. 1.0

MonolithicPower.com

1

11/30/2021

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© 2021 MPS. All Rights Reserved.

DESCRIPTION

The MP3435 is a 600kHz, fixed frequency,

high-efficiency,

highly

integrated

boost

converter that operates across a wide input

voltage

(VIN)

range,

with

optional

input

disconnect and an input average current limit

function. The input disconnect feature provides

additional protection by isolating the input from

the output during an output short or shutdown.

For battery-operated applications, this feature

also helps prevent battery depletion. With a

configurable input average current limit, the

MP3435 supports a wide range of applications.

The

MP3435

features

a

10mΩ low-side

MOSFET (LS-FET) and a 15m

Ω synchronous

high-side MOSFET (HS-FET) for high efficiency

and low BOM cost. An external compensation

pin allows flexibility in setting loop dynamics

and obtaining optimal transient performance

under all conditions.

The MP3435 includes under-voltage lockout

(UVLO), switching current limiting, and thermal

shutdown to prevent damage in the event of an

output overload.

The MP3435 is available in a low-profile QFN-

20 (3mmx4mm) package.

FEATURES

•

3V to 20V Wide Input Voltage (VIN) Range

•

Up to 22V Output Voltage (VOUT)

•

Integrated 10mΩ and 15mΩ MOSFET

•

19A Internal Switch Current Limit or

External Configurable Input Current Limit

•

Input Disconnect and Output Short-Circuit

Protection (SCP)

•

Configurable Under-Voltage Lockout

(UVLO) and Hysteresis

•

<1µA Shutdown Current

•

Thermal Shutdown at 150°C

•

Available in QFN-20 (3mmx4mm)

Package

Optimized Performance with

MPS Inductor MPL-AY1050 Series

APPLICATIONS

•

Thunderbolt Interfaces

•

Notebooks and Tablets

•

Bluetooth Audio

•

Power Banks

•

Fuel Cells

•

Point-of-Sale (POS) Systems

All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.

For MPS green status, please visit the MPS website under Quality

Assurance.

“MPS,” the MPS logo, and “Simple, Easy Solutions” are

registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries.

TYPICAL APPLICATION

MP3435

SW

BST

SS

GATE

SENSE

EN

IN

VDD

PGND

AGND

SOUT

FB

COMP

VIN

VOUT = 12V

C1

3 x 22µF

4.5m

Ω

OFF ON

R1

300k

Ω

R4

R2

34k

Ω

C2

C3

2.2µF

C4

10nF

C5

3.3nF

C6

0.1µF

R3

24.9k

Ω

Q1

OUT

3 x 22µF

L1

MPL-AY1050-1R5

Optional Circuit

Efficiency vs. Load Current

VOUT = 12V, without input MOSFET,

GATE = GND

30

40

50

60

70

80

90

100

0.001

0.01

0.1

1

10

LOAD CURRENT (A)

VIN=3.3V

VIN=4.2V

VIN=6V