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LTM2884

Isolated USB Transceiver with Isolated Power

Linear Technology 

LTM2884

Pin Functions

Upstream Side (VCC, VBUS, VLO, GND)

D1– (A1): USB Data Bus Upstream Facing Negative

Transceiver Pin. A 1.5k pull-up resistor is automatically

configured to indicate the idle condition of the D2– pin.

D1+ (A2): USB Data Bus Upstream Facing Positive

Transceiver Pin. A 1.5k pull-up resistor is automatically

configured to indicate the idle condition of the D2+ pin.

SPNDPWR (A3): Suspend Power Control. A high input

enables the DC/DC converter shutdown control if the USB

bus is suspended. A low input (GND) disables the shut-

down control to the DC/DC converter maintaining power

to the isolated downstream side during suspend mode.

The recovery time from suspend mode may be equivalent

to the power supply start-up time if the DC/DC converter

was shut down. The SPNDPWR pin is referenced to VLO

and GND.

ON (A4): Enable for Power and Data Communication

Through the Isolation Barrier. If ON is high, the part is

enabled. If ON is low, the upstream side is held in reset

and the isolated side is unpowered by the DC/DC converter.

The ON pin is referenced between VLO and GND.

VLO (A5): Internally Regulated 3.3V Logic Voltage Output.

The VLO pin is used as a positive reference for the ON and

SPNDPWR pins and can source up to 10mA of surplus

current. Internally bypassed to GND with 2.2µF. Output

supply, no external connection necessary.

GND (A6, B1-B11): Upstream Circuit Ground.

VBUS (A7): Voltage Supply Input to USB Transceiver. The

operating range is 4.4V to 16.5V. Connect to the USB

VBUS supply or an external source. Internally bypassed

to GND with 2.2µF.

VCC (A8-A11): Voltage Supply Input to DC/DC Converter.

The operating range is 4.4V to 16.5V. Connect to an external

supply greater than 8.6V for 500mA on VCC2. Connect to

the USB VBUS for up to 200mA on VCC2. Connect VCC to

VBUS when the peripheral device has an external power

source. Internally bypassed to GND with 4.7µF.

Isolated Downstream Side (VCC2, VLO2, GND2)

GND2 (K1-K11, L3, L4, L6, L7): Downstream Circuit

Ground.

D2– (L1): USB Data Bus Downstream Facing Negative

Transceiver Pin. The pin has a 15k pull-down resistor to

GND2.

D2+ (L2): USB Data Bus Downstream Facing Positive Trans-

ceiver Pin. The pin has a 15k pull-down resistor to GND2.

VLO2 (L5): Internally Regulated 3.3V Logic Voltage Output.

The VLO2 pin can source up to 10mA of surplus current.

Internally bypassed to GND2 with 2.2µF. Output supply,

no external connection necessary.

VCC2 (L8-L11): Isolated Voltage Supply Output from DC/

DC Converter. Output voltage is 5V and can support up to

500mA of peripheral device current referenced to GND2.

Output current is dependant on input supply voltage and

current limit. Internally bypassed to GND2 with 22µF.

Output supply, no external connection necessary.

2884f

8

For more information www.linear.com/LTM2884

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