MP3378

– 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER

MP3378 Rev. 1.01

www.MonolithicPower.com

5

5/26/2017

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© 2017 MPS. All Rights Reserved.

Parameters

Symbol

Condition

Min

Typ

Max

Units

WLED controller section

Supply current (quiescent)

load

without

switching,

buck disabled

1.2

1.35

1.5

mA

Supply current (shutdown)

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

EN high voltage

1.8

V

EN 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

1 V < COMP < 1.9 V

70

μA

COMP sink current limit

1 V < COMP < 1.9 V

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

32

34.2

mA

Current matching

(5)

2.5

%

VCC max current limit

50

75

100

mA

LED FET resistance

R_LED

1.7

Ω