MP23701 – 24V, 2A, 1.5MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER

MP23701 Rev. 1.0

www.MonolithicPower.com

3

3/22/2019

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2019 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

NC

No connection.

2

VIN

Supply voltage. The MP23701 operates on a 4.2V to 24V unregulated input range.

An input capacitor is needed to prevent large voltage spikes from appearing at the

input.

3

SW

Switch output.

4

GND

Ground. GND is the voltage reference for the regulated output voltage. Pay careful

attention to GND during layout.

5

BST

Bootstrap. Connect a capacitor between SW and BST to form a floating supply

across the power switch driver. This capacitor is needed to drive the power switch’s

gate above the supply voltage.

6

EN/DIM

On/off control input and dimming command input. Leave EN/DIM floating or apply

a voltage higher than 0.59V on EN/DIM to turn on the MP23701. For analog dimming,

when the EN/DIM voltage rises up from 0.7V to 1.44V, the output current changes

from its minimum value to the full-scale LED current.

7

FB

Current sense feedback voltage. The FB internal reference voltage is 0.1V.

8

NTC

LED temperature protection. Connect an NTC resistor from NTC to GND to reduce

the output current to protect the LED when the ambient temperature rises up at high

levels.

ABSOLUTE MAXIMUM RATINGS (1)

Supply voltage (VIN) ...................................... 26V

VSW ........................................ -0.3V to VIN + 0.3V

VBST........................................................VSW + 6V

All other pins ................................... -0.3V to +6V

Continuous power dissipation (TA = 25°C) (2)

UTQFN-8 (1.5mm x 2.5mm).....................1.39W

Junction temperature ................................ 150°C

Lead temperature...................................... 260°C

Storage temperature.................-65°C to +150°C

ESD capability human body mode ............ 2.0kV

Recommended Operating Conditions (3)

Supply voltage (VIN) ......................... 4.2V to 24V

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

Thermal Resistance (4)

θJA

θJC

UTQFN-8 (1.5mmx2.5mm) ...... 90 ..... 20 ...°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 θJA, 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 produces an excessive die temperature, causing

the regulator to 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.