MA5887. USB Fast Charging Emulator 2013/11/20. Copyright 2009 Moai LTD Page 1 of 8
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1 MA5887 USB Fast Charging Emulator 2013/11/20 Page 1 of 8
2 Description With Smartphone and Tab become the mainstream portable mobile devices, the demand for a universal charging (fast charging) to various mobile devices increase dramatically. MA5887 is an USB fast-charging controller which, if putting it in wall-adaptors, travel chargers, and car-chargers, allows to identify these adaptor/charger as an original USB-dedicated charger to Smartphone. Normally, a USB wall-charger provides unified charging mechanism by traditional USB current supply (0.5A) when charging devices through USB ports. With an USB enabled wall-charger which complies with USB Battery Charging Specification (BC), it provides unified charging mechanism by more USB current supply (up to 1.5A) when charging the devices through USB ports, so called fast-charging mechanism. In another word, MA5887 is a high performance solution for fast-charging mechanism and speed up charging time much. MA5887 embedded automatic charger detection circuit which complies with USB Battery Charging Specification (BC) version 1.2, and Apple/Samsung Tab resistor mode. This feature implies MA5887 supports wide range of Smartphone/Tabs for fast charging. The MA5887 is designed for all charger products with USB interface. With the package of SOT23-5, the MA5887 provides best performance and cost solution. Feature : Fast Charging : USB Battery Charging Specification1.2 (BC1.2) Apple (1A/2.4A) resistor mode Samsung Tab 2.1A charging mode Support China Telecommunication Industry Standard YD/T Automatic charger detection circuit Selectable between Apple 1A/2.4A mode ESD Pass +-8Kv HBM (Human Body Mode) on DP/DM pin Low power consumption Build in Power Switch SOT23-5 package Target Application : USB Wall Charger Adaptor Travel Adaptor USB Car Charger / Cigarette Lighter Adaptor Power bank Page 2 of 8
3 MA5887 Charging Modes : Charging Mode Max charging current Support Device Type BC1.2 (DCP only) 1.5A BC 1.2 device Apple Resistor 1A (SEL pull Low by resistor) iphone Apple Resistor 2.4A (SEL floating, Default setting) New ipad ( ipad Air) Samsung Divider 2.1A Galaxy Tab Detail Function Description Smartphone/Tab will monitor Timing/voltage/Current of D+/D- signal to determine which kind of charging port it connected to. The impedances presented on D+ and D- of dedicated chargers are different depending on the specific standard the dedicated charger is designed to. Standards such as BS1.2, Divider mode and Quick Charge 2.0. BC1.2 and the Chinese Telecommunications Industry Standard YD/T define that the D+ and D- data lines should be shorted together with a maximum series impedance of 200 Ω. Apple divider mode, 2 V and 2.7 V are presented on D+ and on D-. Apple 2.1A divider mode BC1.2 DCP mode Apple divider mode, Samsung Galaxy mode and BC1.2 define the protocol necessary to allow portable devices to recognize what kind of port it is connected to, so that it can start its maximum allowable current draw. Current dedicated charger limitation : Apple ipad USB charger can not charge Galaxy Tab Samsung Galaxy Tab USB charger can not charge iphone/ipad Traditional USB wall adaptor (BC1.2, DCP, with DP/DM short) can not charge iphone/ipad/galaxy tab If using MA5887 in an USB charger. After protocol handshaking between MA5887 and the charging device (Smartphone/Tab) through DP/DM signals, MA5887 will auto-configure the dedicated DP/DM voltage bios for the connecting charging devices. Page 3 of 8
4 Smart (Universal) USB Charger MA5887 starts with Apple Divider Mode. Thus if a BC1.2 compliant device is attached, MA5887 responds by discharging, turn on the internal power switch and operating in BC1.2 DCP mode. It then stays in that mode until the device is unattached, in which case MA5887 then goes back to Apple Divider Mode. Page 4 of 8
5 Pin Assignment Page 5 of 8
6 Pin Description Pin # Pin Name I/O Description 1 SEL I Mode selection 2 GND P Ground 3 VDD5 P Power 4 DP B D+ to USB connector 5 DM B D- to USB connector I/O Type Definition O : Output I : Input B : Bi-directional P : Power I : Input P : Power Copyright 2009 MOAI Ltd Ver Page 6 of 8
7 Electrical Characteristics Rating Symbol. Parameter Unit Min. Typ. Max. VDD5 Voltage Operating Range V Icc Supply Current (VDD5 = 4.5V) ua Supply Current (VDD5 = 5.5V) ua V IH High level input voltage 0.7VDDR33 V V IL Low level input voltage 0.3VDDR33 V V OH High level output voltage 0.8VDDR33 V V OL Low level output voltage 0.2VDDR33 V Schematic Copyright 2009 MOAI Ltd Ver Page 7 of 8
8 Package (SOT23-5) Copyright 2009 MOAI Ltd Ver Page 8 of 8
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