QUICK CHARGE SOLUTION

12%!Conventional

Charging

30%!Quick Charge. 1.0

60%!Quick Charge 2.0

Tests charging a 3300mAh battery using [1] QC2.0 USB wall adapter (9V, 2A) [2] USB wall adapter (5V, 2A) [3] USB wall adapter (5V, 1A) source from: Qualcomm

With battery life still struggling to accommodate the needs of heaviest smartphone users, reducing charging times is the next best thing. In order to speed up the battery charging speed, designers have to work on the charging power. Since Power = Voltage x Current, it means that the charging power can be improved by changing the design of both voltage and current. Currently the protocol launched by Qualcomm and MediaTek respectively for fast charging is based on the variable DC voltage mode. Yet, since the charging speed of the fast charging will eventually become slower, in order to prevent the battery from overshoot and other side effect, trickle charging will be applied The charging speed of fast charging is 45%-75% faster than the original charging. The Quick Charge 2.0 protocol launched by Qualcomm and the Pump ExpressTM protocol launched by MediaTek are the pioneers of this fast charging technology. Recently PI, Dialog, Leadtrend etc. are launching fast charging adaptor solutions based on these protocols. Quick Charge 2.0 and MTK Pump ExpressTM are the two common fast charging protocols in the industry. Below is the comparison between these two protocols.

The charging speed is 75% faster by Quick Charge 2.0 protocol

Technology Quick Charge 2.0 Pump ExpressTM

Company Qualcomm MediaTek

Feature Charging speed 75%faster Charging speed 45%faster

Additional Accessories

High cost(integration of hard/software) Phone side: Same cost, through USB PHY Charger side: Add new IC for communication

Low Cost (software improvement) Phone side: PMIC needs to support load modulation Charger side: load modulation integrated into IC

Original Solution

PI(Solution SC1209K) Dialog( Solution IW1760)

Dialog(Solution IW1680) Leadtrend(Solution LD5513/LD5515)

Output Voltage Type A: 5V, 9V, 12V Type B: 5V, 9V, 12V, 20V

Pump Express(5V)Pump Express Plus(12V)

TechnologyBase on the D+/D‐through USB Charger needs to provide high output voltage and power to the cell phone

Charger needs to provide high output voltage and power to the cell phone

QUICK CHARGE 2.0 AND MTK PUMP EXPRESSTM CHARGING PROTOCOLS COMPARISON

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DISCRETE PRODUCTS SOLUTION

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Structure Function Product Package Type

Flyback for Quick 2.0

Primary rectifier General Rectifier 2A/1000V SMA S2MASnubber Fast Rectifier 1A/1000V SOD-123 RS1010FVcc stabilization Zener 500mW/12V SOD-123 MMSZ5242BVcc rectifier Fast Rectifier 1A/200V SOD-123FL SOD1F2

Switching

Depletion-Mode MOSFET 12mA/600V SOT-23 DMS05N60

High Voltage MOSFET

6A/700V TO-251 MSU6N706A/700V TO-252 MSD6N70

Output rectifier Schottky Rectifier

10A/80V DFN3X3 SD10PU8010A/80V TO-277 SS10PU8010A/100V TO-277 SS10PU100S12A/100V TO-277 SS12PU10020A/80V TO-277 SS20PU80

Synchronous Rectification for Quick 2.0

Primary rectifier General Rectifier 2A/1000V SMA S2MASnubber Fast Rectifier 1A/1000V SOD-123 RS1010FVcc stabilization Zener 500mW/12V SOD-123 MMSZ5242BVcc rectifier Fast Rectifier 1A/200V SOD-123FL SOD1F2

Switching

N-Channel MOSFET 11A/100V SO-8 MS44N94

High Voltage MOSFET

6A/700V TO-251 MSU6N706A/700V TO-252 MSD6N70

Parallel Diode Schottky Rectifier 1A/100V SOD-123S SD110S

Flyback For Pump Express

Primary rectifier Bridge 0.8A/1000V MBS MB10S

SnubberTVS 600W/120V SMB P6SMB120AFast Rectifier 1A/1000V SOD-123 RS1010F

Vcc stabilization Zener 500mW SOD-123 MMSZ5242Bvcc rectifier Fast Rectifier 1A/200V SOD-123FL SOD1F2

Switching NPN Transistor 1.5A/800V SOT-23 SS8050MOSFET 12mA/600V SOT-23 DMS05N60

Output rectifier Schottky Rectifier5A/40V SMB SS54B10A/50V TO-277 SS10PU5020A/60V TO-277 SS20PU60