MP3378E

– 4-CHANNEL WLED CONTROLLER WITH BUCK CONVERTER

MP3378E Rev. 1.02

www.MonolithicPower.com

5

5/26/2017

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

© 2017 MPS. All Rights Reserved.

Parameters

Symbol

Condition

Min

Typ

Max

Units

WLED Controller Section

Supply current (quiescent)

no load without switching,

buck disabled

1.2

1.35

1.5

mA

Supply current (shutdown)

buck disabled

1

μA

LDO output voltage

5.4

6

6.6

V

VCC1 UVLO threshold

Rising edge

3.6

4

4.4

V

VCC1 UVLO hysteresis

200

mV

EN1 high voltage

1.8

V

EN1 low voltage

0.6

V

Step-Up Converter

Gate driver impedance

(sourcing)

4.1

7

Ω

Gate driver impedance

(sinking)

3

5

Ω

Switching frequency

470

530

590

kHz

150

180

210

kHz

OSC voltage

1.20

1.23

1.26

V

Maximum duty cycle

93

%

Cycle-by-cycle ISENSE

current limit

Max duty cycle

145

180

230

mV

COMP source current limit

1V < COMP < 1.9V

70

μA

COMP sink current limit

1V < COMP < 1.9V

17

μA

COMP transconductance

ΔI

440

μA/V

Current Dimming

PWM input low threshold

0.75

V

PWM input high threshold

1.25

V

Analog dimming input low

threshold

0.38

0.41

0.44

V

Analog dimming input high

threshold

1.44

1.49

1.54

V

LED Current Regulation

ISET voltage

1.20

1.225

1.25

V

LEDX average current

31.4

33

34.2

mA

Current matching

(5)

2.5

%

VCC max current limit

50

75

100

mA

LED FET resistance

R_LED

1.7

Ω

LEDX regulation voltage

800

mV

260

mV