LTC4265
5
4265fb
For more information www.linear.com/LTC4265
Typical perForMance characTerisTics
PWRGD, T2PSE Output Low
Voltage vs Current
Active High PWRGD
Output Low Voltage vs Current Inrush Current vs Input Voltage
CURRENT (mA)
0
PWRGD
V
T2PSE
(V)
0.4
0.6
8
4265 G07
0.2
0
2
4
6
10
T
A
= 25°C
CURRENT (mA)
0
0
0.4
1.0
0.5
1
4265 G08
0.2
0.8
0.6
1.5
2
T
A
= 25°C
GND – V
OUT
= 4V
GND VOLTAGE (V)
40
85
CURRENT (mA)
115
45 50
4265 G09
55 60
90
100
105
110
95
90
100
105
110
95
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 V
IN
.
T2PSE (Pin 2): Type-2 PSE Indicator, Open-Drain. Low
impedance indicates the presence of a Type-2 PSE.
R
CLASS
(Pin 3): Class Select Input. Connect a resistor
between R
CLASS
and V
IN
to set the classification load
current. (See Table 2.)
NC (Pin 4, 11): No Connect.
V
IN
(Pins 5, 6): Input Voltage, Negative Rail. Pins 5 and 6
must be electrically tied together at the package.
V
OUT
(Pins 7, 8): Output Voltage Negative Rail. Connects
V
OUT
to V
IN
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 V
OUT
and features a 14V clamp.
PWRGD (Pin 10): Complementary Power Good Output,
Open-Drain. Low impedance signals power up completion.
PWRGD is referenced to V
IN
.
GND (Pin 12): Input Voltage, Positive Rail. This pin is
connected to the PD positive rail.
Exposed Pad (Pin 13): Tie to V
IN
and PCB heat sink.
