LTC4264IDE datasheet(5/24 Pages) LINER

5 / 24 page

LTC4264

4264f

PIN FUNCTIONS

SHDN (Pin 1): Shutdown Input. Used to command the

LTC4264 to present an invalid signature. Connecting

SHDN to GND lowers the signature resistance to an invalid

value and disables other LTC4264 operations. If unused,

tie SHDN to VIN.

NC (Pin 2): No Internal Connection.

RCLASS (Pin 3): Class Select Input. Used to set the current

the LTC4264 maintains during classiﬁcation. Connect a

resistor between RCLASS and VIN. (See Table 2.)

ILIM_EN (Pin 4): Input Current Limit Enable. Used to control

LTC4264 current limit behavior during powered operation.

For normal operation, ﬂoat ILIM_EN to enable ILIMIT_HIGH

current. Tie ILIM_EN to VIN to disable input current limit.

Note that the inrush current limit does not change with

ILIM_EN selection. See Applications Information.

VIN (Pins 5, 6): Power Input. Tie to the PD input through

the diode bridge. Pins 5 and 6 must be electrically tied

together.

VOUT (Pins 7, 8): Power Output. Supplies power to the

PD load through the internal power MOSFET. VOUT is high

impedance until the input voltage rises above the UVLO

turn-on threshold. The output is then connected to VIN

through a current-limited internal MOSFET switch. Pins 7

and 8 must be electrically tied together.

PWRGD (Pin 9): Active High Power Good Output, Open

Collector. Signals to the DC/DC converter that the LTC4264

MOSFET is on and that the converter can start operation.

High impedance indicates power is good. PWRGD is ref-

erenced to VOUT and is low impedance during inrush and

in the event of a thermal overload. PWRGD is clamped

14V above VOUT.

PWRGD (Pin 10): Active Low Power Good Output, Open-

Drain. Signals to the DC/DC converter that the LTC4264

MOSFET is on and that the converter can start operation.

Low impedance indicates power is good. PWRGD is

referenced to VIN and is high impedance during detec-

tion, classiﬁcation and in the event of a thermal overload.

PWRGD has no internal clamps.

NC (Pin11): No Internal Connection.

GND (Pin 12): Ground. Tie to system ground and power

return through the input diode bridge.

Exposed Pad (Pin 13): Must be soldered to electrically

isolated heat sink.

LTC4264IDE Folha de dados(PDF) 5 Page - Linear Technology

LTC4264IDE Folha de dados(HTML) 5 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Folha de dados Download

Ligação URL