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ISL54226 数据表(PDF) 9 Page - Intersil Corporation

部件名 ISL54226
功能描述  High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL54226 数据表(HTML) 9 Page - Intersil Corporation

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ISL54226
9
FN7614.0
July 29, 2010
Detailed Description
The ISL54226 device is a dual single pole/single throw
(SPST) analog switch configured as a DPST that operates
from a single DC power supply in the range of 2.7V to
5.25V.
It was designed for switching a USB high-speed or
full-speed source in portable battery powered products.
It is offered in small µTQFN and TDFN packages for use
in MP3 players, cameras, PDAs, cellphones, and other
personal media players.
The part consists of two 3.5Ω high-speed SPST switches.
These switches have high bandwidth and low capacitance
to pass USB high-speed (480Mbps) differential data
signals with minimal edge and phase distortion. They can
also swing from 0V to 3.6V to pass USB full speed
(12Mbps) differential data signals with minimal
distortion.
The part contains special overvoltage detection and
protection (OVP) circuitry on the COM+ and COM- pins.
This circuitry acts to open the USB in-line switches when
the part senses a voltage on the COM pins that is >3.8V
(typ) or < -0.45V (typ). It isolates voltages up to 5.25V
and down to -5V from getting through to the other side
of the switch to protect the USB transceiver connected at
the D+ and D- pins.
The device has an open drain OE/ALM pin that can be
driven “Low” to open all switches. The OE/ALM pin gets
internally pulled “Low” whenever the part senses an
overvoltage condition. The pin must be externally pulled
“High” with a 100kΩ pull-up resistor and monitored for a
“Low” to determine when an overvoltage condition has
occurred.
The part has charger port interrupt detection circuitry
(CP) on the COM pins that outputs a Low on the INT pin
to inform the µController or power management circuitry
when entering a dedicated charging port mode of
operation. The charger mode operation is initiated by
driving the OE/ALM pin Low and externally connecting
the COM pins together which pulls the COM lines High,
triggering the INT pin to go Low and the SPST switches
to open.
The ISL54226 was designed for MP3 players, cameras,
cellphones, and other personal media player applications
that need to switch a high-speed or full-speed
transceiver source. A “Typical Application Block Diagram”
of this functionality is shown on page 8.
A detailed description of the SPST switches is provided in
the following section.
High-Speed (Dx) SPST Switches
The Dx switches are bi-directional switches that can pass
USB high-speed and USB full-speed signals when VDD is
in the range of 2.7V to 5.25V.
When powered with a 2.7V supply, these switches have a
nominal rON of 3.5Ω over the signal range of 0V to
400mV with a rON flatness of 0.26Ω. The rON matching
between the switches over this signal range is only 0.2Ω,
ensuring minimal impact by the switches to USB
high-speed signal transitions. As the signal level
increases, the rON switch resistance increases. At signal
level of 3.3V, the switch resistance is nominally 9.8Ω.
See Figures 9, 10, 11, 12, 13, 14 in the “Typical
Performance Curves” beginning on page 12.
The Dx switches were specifically designed to pass USB
2.0 high-speed (480Mbps) differential signals in the
range of 0V to 400mV. They have low capacitance and
high bandwidth to pass the USB high-speed signals with
minimum edge and phase distortion to meet USB 2.0
high-speed signal quality specifications. See Figure 15 in
the “Typical Performance Curves” on page 13 for USB
High-speed Eye Pattern taken with switch in the signal
path.
The Dx switches can also pass USB full-speed signals
(12Mbps) in the range of 0V to 3.6V with minimal
distortion and meet all the USB requirements for USB
2.0 full-speed signaling. See Figure 16 in the “Typical
Performance Curves” on page 14 for USB Full-speed
Eye Pattern taken with switch in the signal path.
The switches are active (turned ON) whenever the
OE/ALM voltage is logic “1” (High) and OFF when the
OE/ALM voltage is logic “0” (Low).
Overvoltage Protection (OVP)
The maximum normal operating signal range for the Dx
switches is from 0V to 3.6V. For normal operation the
signal voltage should not be allow to exceed these
voltage levels or go below ground by more than -0.3V.
However, in the event that a positive voltage >3.8V (typ)
to 5.25V, such as the USB 5V VBUS voltage, gets shorted
to one or both of the COM+ and COM- pins or a negative
voltage < -0.45V (typ) to -5V gets shorted to one or both
of the COM pins, the ISL54226 has OVP circuitry to
detect the over voltage condition and open the SPST
switches to prevent damage to the USB down-stream
transceiver connected at the signal pins (D-, D+).
The OVP and power-off circuitry allows the COM pins
(COM-, COM+) to be driven up to 5.25V while the VDD
supply voltage is in the range of 0V to 5.25V. In this
condition the part draws <100µA of ICOMx and IDD
current and causes no stress to the IC. In addition the
SPST switches are OFF and the fault voltage is isolated
from the other side of the switch.
The OE/ALM pin gets internally pulled low whenever the
part senses an overvoltage condition. The pin must be
externally pulled “High” with a 100kΩ pull-up resistor
and monitored for a “Low” to determine when an
overvoltage condition has occurred. This output can be
monitored by a µController to indicate a fault condition to
the system.


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