STCC2540
USB charging controller with integrated power switch
Datasheet
-
production data
Applications
•
USB ports / hubs
•
Personal computers, all-in-one PCs
•
Monitors
•
Notebooks, ultrabooks
•
Tablet PCs
VFQFPN 16L 3 x 3 x 0.8 mm
•
Universal wall charging adapters
Description
Features
•
Compliant with USB charging 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 mΩ
•
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)
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.
February 2014
This is information on a product in full production.
DocID024711 Rev 6
1/32
www.st.com
Contents
STCC2540
Contents
1
2
3
4
5
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1
5.2
5.3
5.4
5.5
5.6
Supported modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Remote wakeup in S3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
V
BUS
discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
State machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Charging detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Overcurrent conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
FAULT functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Current limit programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.7
5.8
Enable input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Input and output capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6
7
8
9
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2/32
DocID024711 Rev 6
STCC2540
Functional description
1
Functional description
The STCC2540 device integrates, in one package, a complete solution to charge portable
devices through USB ports, including:
•
Charger emulator compatible with USB battery 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 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 R
ON
resistance, allowing signals to pass with minimum edge and phase distortion.
N-channel power switch with low R
ON
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
(max.).
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 V
IN
.
Charging current sensing circuit. 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 threshold, 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 when 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.
DocID024711 Rev 6
3/32
32
Functional description
Figure 1. Block diagram
STCC2540
Figure 2. Pinout
4/32
DocID024711 Rev 6
STCC2540
Pin description
2
Pin description
Table 1. Pin description
Pin no.
1
2, 3
4
5
6, 7, 8
9
10, 11
12
13
14
15
16
Name
IN
DM_OUT, DP_OUT
NC
EN
CTL1, CTL2, CTL3
CHARGING
DP_IN, DM_IN
OUT
FAULT
GND
NC
I
LIM
Type
Description
PWR Device and USB port power supply input
I/O
-
I
I
O
I/O
USB 2.0 data connection to system USB transmitter (DM = D-, DP = D+)
Not connected
Logic level control input. When EN is low, power switch, data switch and
emulator are OFF.
Logic level control inputs to select charger mode (see
Table 5).
Active low open drain output, asserted when charging current is detected.
USB 2.0 data connection to system USB connector (DM = D-, DP = D+)
PWR USB port power supply output (V
BUS
)
O
-
-
I
Active low open drain output, asserted when overcurrent, overtemperature
or reverse voltage are detected.
Ground
Not connected
Current limit threshold programming resistor terminal.
DocID024711 Rev 6
5/32
32
Integrated technical exchanges
京公网安备 11010802033920号
EEWORLD
