MPQ4487 – STEP-DOWN CONVERTER WITH DUAL USB CHARGING PORTS, AEC-Q100

MPQ4487 Rev.1.0

www.MonolithicPower.com

12

10/17/2017

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BLOCK DIAGRAM

Σ

Bootstrap

Regulator

HS

Driver

LS

Driver

VCC

Control

Logic

Oscillator

VCC

Regulator

Reference

Line Drop

Compensation

IN

VCC

OUT

AGND

BST

Current Sense

Amplifier

Current Limit

Comparator

PWM Comparator

OVP Comparator

Error Amplifier

SW

PGND

Curent

Sense

Curent

Sense

Charge Pump

Control

Logic

Thermal

Sense

UVLO

Discharge

Discharge

USB1

USB2

FREQ

Current

Limit

SS

CC1

CC2

CC3

CC4

Vconn from

Buck output

5V

Type-C

Control

OUT_SEL

EN2

Fault

FLT1

5ms

Deglitch

EN1

Fault

5ms

Deglitch

FLT2

EN

2MΩ

Rd1

Rd2

R1

R2

FB

Rd3

Rd4

USB2 Type-A

Mode Detect

USB1 Type-A

Mode Detect

Figure 1: Functional Block Diagram