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AP4370KTTRG1 Datasheet(PDF) 4 Page - Diodes Incorporated |
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AP4370KTTRG1 Datasheet(HTML) 4 Page - Diodes Incorporated |
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4 / 12 page  AP4370 Document number: DS37242 Rev. 3 - 2 4 of 12 www.diodes.com October 2015 © Diodes Incorporated 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 0.6 Turn-on Turn-on 12 3.3 0.6 Turn-on Turn-off 9 0.6 3.3 Keep Present V1/V2 Status Unchanged 3.3 3.3 Keep Present V1/V2 Status Unchanged 0.6 or 3.3 GND Turn-off Turn-off 5 GND 0.6 or 3.3 or GND Turn-off Turn-off 5, AP4370 Protocol Handshake Reset Table 1. D+/D- Voltage Decoder |
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