STCC5021 datasheet(3/37 Pages) STMICROELECTRONICS

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STCC5011, STCC5021

Functional description

The STCC5011 and STCC5021 devices integrate, in one package, a complete solution to

charge portable devices through USB ports. Functions include:

•

Charger emulator compatible with USB battery charging BC1.2 standard, Chinese

telecommunications standard YD/T 1591-2009 and proprietary chargers such as

Apple® divider mode, BlackBerry® and Korean tablet charging mode.

•

The Apple divider mode comes in 2 profiles:

–

1 A max. current drawn: for Apple iPod®, iPhone® (STCC5011)

–

2 A max. current drawn: for Apple iPad®, supporting also Apple iPod and iPhone

(STCC5021)

•

3 control pins, CTL1, CTL2, CTL3 allowing the 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 RON

resistance, allowing signals to pass with minimum edge and phase distortion.

•

N-channel power switch with low RON resistance of 65 mΩ typ., high current limiter

accuracy and high current output capability, 2.5 A typ. The current limit threshold can

be adjusted with a good accuracy by an external resistor in the range 500 mA to 2.8 A.

Constant current mode protection is used to protect the device and the host system

against overcurrent or short-circuit. Other 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 VIN.

•

Charging current sensing circuit. The output CHARGING/ATTACH is asserted if

charging current is above 20 mA in CDP and DCP modes.

In CDP mode the charging flag is asserted only if the CDP handshaking between the

portable device and the host is performed before the current is above the threshold.

Moreover, in S4/S5 power states and battery supplied, there is an additional safety

timer to stop the charging process when the “end of charge” timeout is reached. This

timer is started only after a device attachment event and can be disabled by toggling

the pin ATTACH_EN to low if the timer is not wanted.

If the timeout or current is below the threshold, the signal CHARGING/ATTACH is

deasserted: in both cases, the host system can disable the high power DC-DC

converter and therefore reduce power consumption. This is crucial when the host is

battery supplied.

•

Attach detector circuit to monitor device attachment.

This circuit is enabled by driving the ATTACH_EN pin high and EN low. When a device

attachment is detected, the output CHARGING/ATTACH is asserted for a tATTACH

period (25 s typ.). The attach detection block is supplied by the VDD power supply pin.

•

An enable input (EN) to enable/disable the device, except the attach detection switch

which is also managed by the ATTACH_EN input.

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.

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