LTC4265IDE-PBF datasheet(5/20 Pages) LINER

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LTC4265

4265f

PIN FUNCTIONS

SHDN (Pin 1): Shutdown Input. Use this pin for auxiliary

power application. Drive SHDN high to disable LTC4265

operation and corrupt the signature resistance. If unused,

tie SHDN to VIN.

T2PSE (Pin 2): Type-2 PSE Indicator, Open-Drain. Low

impedance indicates the presence of a Type-2 PSE.

RCLASS (Pin 3): Class Select Input. Connect a resistor

between RCLASS and VIN to set the classiﬁcation load

current. (See Table 2.)

NC (Pin 4, 11): No Connect.

VIN (Pins 5, 6): Input Voltage, Negative Rail. Pins 5 and 6

must be electrically tied together at the package.

VOUT (Pins 7, 8): Output Voltage Negative Rail. Connects

VOUT to VIN through an internal power MOSFET. Pins 7

and 8 must be electrically tied together at the package.

PWRGD (Pin 9): Power Good Output, Open Collector.

High impedance signals power-up completion. PWRGD

is referenced to VOUT and features a 14V clamp.

PWRGD (Pin 10): Complementary Power Good Output,

Open-Drain. Low impedance signals power up completion.

PWRGD is referenced to VIN.

GND (Pin 12): Input Voltage, Positive Rail. This pin is

connected to the PD positive rail.

Exposed Pad (Pin 13): Tie to VIN and PCB heat sink.

BLOCK DIAGRAM

4265 BD

BOLD LINE INDICATES

HIGH CURRENT PATH

T2PSE 2

RCLASS 3

NC 4

SHDN

PWRGD

GND

11 NC

PWRGD

VOUT

CONTROL

CIRCUITS

CLASSIFICATION

CURRENT LOAD

REF

–

25k

14k

EXPOSED PAD 13

VIN 6

VIN 5

LTC4265IDE-PBF 数据表(PDF) 5 Page - Linear Technology

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