AP4370 datasheet(4/12 Pages) DIODES

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AP4370

Document number: DS37242 Rev. 3 - 2

4 of 12

www.diodes.com

October 2015

AP4370

Operation Principle Description

Overall Introduction

The figure on page 1 is the typical application circuit of AP4370, which follows Qualcomm HVDC Quick Charge 2.0 Protocol to decode the

different combinations of D+/D- signals, generated by the portable device, into the related configurations of V1/V2 for the controller IC to make

the further constant voltage/constant current control. The AP4370 automatically provides 5V output configuration for the connected portable

device that is not compatible to QC 2.0 protocol. When the portable device requests a lower output voltage, the AP4370 will have over voltage

discharge function operate until the output voltage reaches VOVDxV * kDIS or the time duration is over tOVD .

Quick Charge 2.0 Protocol Operation

The switches of S1, SV1 and SV2 (shown in Functional Block Diagram on page 2) will be kept turn-off during the start-up phase, and the default

V1/V2 configuration ensures that the charger/adapter is regulated into 5V output voltage. S0 switch will be turned on to short D+ to D- at start-up

voltage within VOTG_SESS_VLD (0.8V to 4.0V). If AP4370 finds D+ voltage is between VDAT_REF (0.325V, typical) and VSEL_REF (2.0V, typical) lasting for

tGLITCH_BC_DONE, it will turn off S0 to have D+ / D- open, and turn on S1 to have D- connected to GND via RDM_DWM (19.53kΩ, typical). AP4370 will

ensure that D- stays low voltage for more than tGLITCH_DM_LOW (1ms, min) to successfully complete Qualcomm QC 2.0 protocol handshake. After

that, AP4370 can respond to the voltage request made by the portable device via D+/D- data lines. If AP4370 detects that D+/D- keeps voltage

unchanged for a glitch filter period of tGLITCH_V_CHANGE (40ms, typical), it will follow the voltage decoding table below to configure V1/V2 by turning

on/off SV1 and SV2 to output the target voltage. Finally, after the portable device is removed from USB connector, AP4370 will have D+ shorted to

D- within tD+_D-_SHORT (20ms, max), configure V1/V2 to 5V output, and is ready for next handshake.

Decoder

D+ (V)

D- (V)

V1 Switch(SV1)

Status

V2 Switch(SV2)

Status

HVDCP Voltage (V)

Quick Charge 2.0

Protocol

Class A: 5V, 9V, 12V

0.6

Turn-on

3.3

0.6

Turn-on

Turn-off

0.6

3.3

Keep Present V1/V2 Status Unchanged

3.3

Keep Present V1/V2 Status Unchanged

0.6 or 3.3

GND

Turn-off

GND

0.6 or 3.3 or GND

Turn-off

5, AP4370 Protocol

Handshake Reset

Table 1. D+/D- Voltage Decoder

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