MP5034

– USB CHARGING PORT CONTROLLER INTEGRATING QC 3.0 PROTOCOL

MP5034 Rev 1.0

www.MonolithicPower.com

10

10/20/2017

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© 2017 MPS. All Rights Reserved.

OPERATION

The MP5034 supports the latest quick-charge

specification (QC 3.0) and is back-compatible

with QC 2.0, DCP schemes for battery charging

specification

(BC1.2),

divider

mode,

and

1.2V/1.2V mode without the need for outside

user interaction.

Fault condition protection includes input over-

voltage

protection

(OVP)

and

thermal

shutdown.

Operation Supply Voltage

The MP5034

’s input voltage threshold is around

MP5034's ADJ block begins working, which

sinks

a

current

to

adjust

the

upstream

regulator's output to an accurate 5.1V.

QC Mode Voltage Transition - Class A

If the downstream device of the MP5034

supports QC specification, the device can

require a higher USB bus voltage than 5V by

DM and DP communication. If a higher bus

voltage is required, ADJ must be used. ADJ is

connected to the feedback pin (FB) of an

upstream voltage converter, typically. After the

handshake, the MP5034 sinks a controlled

value to 9V, 12V, or another voltage (200mV

step-by-step).

Because

of

smart

controller

mode, only one ADJ pin can set a different high

voltage, which meets the QC specification. The

bus voltage transition is smooth and has no

undershoot/overshoot (see Figure 2 and Table

1).

5V

9V

12V

DP=0.6V

DM=GND

DP=0.6V

DM=0.6V

DP=3.3V

DM=0.6V

Figure 2: QC Mode Transition

Table 1: QC Mode Definition

Portable Device

USB Bus Voltage

DP

DM

0.6V

0.6V

12V

3.3V

0.6V

9V

0.6V

3.3V

3.6V - 12V, 200mV step

according to QC3.0

3.3V

3.3V

No action

0.6V

GND

5V

When the downstream device is removed, the

bus

voltage

returns

to

the

default

5V

automatically. The input-to-ground discharge

resistor helps quicken this procedure.

Input Voltage Adjust

In no-load condition, if the input voltage is lower

than 5.1V (typical), ADJ sinks a current to

regulate the upstream regulator's output voltage

to 5.1V. If the input voltage is higher than 5.1V,

the MP5034 stops regulating the input voltage.

Figure 3 shows the typical ADJ usage. The ADJ

sink current capability is 500µA. The feedback

current through R1 must be less than 500µA.

Calculate R1 with Equation (1):

 

0.5

(V)

V

(V)

V

k

R1

FB

OUT







(1)

can be adjusted to.

IN

ADJ

MP5034

C1

Converter

OUT

FB

R1

R2

Figure 3: ADJ Configure

Input Over-Voltage Protection (OVP) and

Discharge

To protect the downstream device over-voltage,

the MP5034 provides an input OVP discharge

function. Because the MP5034 supports the QC

3.0 protocol, it has a dynamic OVP threshold.