this is information on a product in full production. february 2014 docid024711 rev 6 1/32 STCC2540 usb charging controller with integrated power switch datasheet - production data features ? compliant with usb char ging specifications bc1.2, usb 2.0 and usb 3.0 standards ? compliant with chinese telecommunications industry standard yd/t 1591-2009 ? compatible with proprietary charging mode (apple ? 1 a / 2 a, blackberry ? , korean tablets) ? wide bandwidth, low-loss usb 2.0 data switch ? integrated v bus power switch with low r on of 65 m ? constant current mode overcurrent protection ? soft-start to limit inrush current ? adjustable current limit up to 2.8 a ? short-circuit, thermal and undervoltage protection ? reverse voltage and reverse current protection ? deglitched fault reporting output ? supports remote wakeup in s3 ? charging indication output in dcp and cdp modes ? package: vfqfpn 16l 3 x 3 x 0.8 mm with exposed pad ? temperature range: -40 up to 85 c ? ul and cb recognized components (ul file number: e354278) applications ? usb ports / hubs ? personal computers, all-in-one pcs ? monitors ? notebooks, ultrabooks ? tablet pcs ? universal wall charging adapters description the STCC2540 device integrates, in one package, a usb charger controller, a wide bandwidth data switch, and a high current power switch. the device emulates several profiles compatible with the usb battery charging standard, bc1.2, chinese telecommunications standard yd/t 1591-2009, and proprietary charger modes. the device asserts the charging flag in dcp modes if the charging current is higher than the threshold. in cdp mode, it asserts the charging flag after the cdp negotiation if the charging current is higher than the threshold. after the current drops below the threshold, the output is deasserted, allowing the host to turn off the high power dc-dc converter and reduce overall consumption in s4/s5 states, which is critical when the host is battery supplied. vfqfpn 16l 3 x 3 x 0.8 mm www.st.com
contents STCC2540 2/32 docid024711 rev 6 contents 1 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 absolute maximum ratings and operating c onditions . . . . . . . . . . . . . 6 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.1 supported modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.2 remote wakeup in s3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.3 v bus discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.4 state machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.5 charging detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.6 power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 overcurrent conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 fault functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 current limit programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.7 enable input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.8 input and output capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6 typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 8 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
docid024711 rev 6 3/32 STCC2540 functional description 32 1 functional description the STCC2540 device integrates, in one packa ge, a complete solution to charge portable devices through usb ports, including: ? charger emulator compatible with usb ba ttery charging bc1.2 standard, chinese telecommunications standard yd/t 1591-2009 and proprietary charger such as apple ? divider mode, blackberry ? and korean tablet charging mode. ? 3 control pins, ctl1, ctl2, ctl3 allowing th e host to select the emulation profile. these pins may be controlled directly from the host usb controller or from the embedded controller. ? usb data switch with wide bandwidth up to 1100 mhz compliant with usb 2.0 standard. this wide bandwidth switch features low capacitance and low r on resistance, allowing signals to pass with minimum edge and phase distortion. ? n-channel power switch with low r on resistance of 65 m typ., high current limiter accuracy and high current out put capability, 2.5 a typ. the current limit threshold can be adjusted with a good accuracy by an extern al resistor in the range 500 ma to 2.8 a (max.). constant current mode protection is used to protect the device and the host system against overcurrent or short-circuit. othe r protection includes reverse current and reverse voltage protection, undervoltage lockout and thermal shutdown. ? a deglitched output (fault ) reporting the failure events of overcurrent, thermal shutdown and reverse current (backdrive) to v in . ? charging current sensing ci rcuit. the output charging is asserted if charging current is above 20 ma in cdp and dcp modes. in cdp mode the charging flag is s asserted only if the cdp handshaking between the portable device and the host is performed before the current is above threshold. after the current drops below th reshold, the output charging is deasserted. the host system can then disable the high power dc -dc converter and thus reduce the power consumption. this is crucial w hen the host is battery supplied. ? an enable input (en) to enable/disable the device. the device is offered in a small, rohs compliant vfqfpn 16l (3 x 3 x 0.8 mm) package with an exposed pad for effective cooling.
functional description STCC2540 4/32 docid024711 rev 6 figure 1. block diagram figure 2. pinout $ 0 9 ' 3 b 2 8 7 ' 0 b 2 8 7 ) $ 8 / 7 & |