Datasheet

LTC4264
2
4264f
PACKAGE/ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
V
IN
Voltage ................................................. 0.3V to –90V
V
OUT
Voltage ......... V
IN
+ 90V (and ≤ GND) to V
IN
– 0.3V
SHDN Voltage ............................ V
IN
+ 90V to V
IN
– 0.3V
R
CLASS
, I
LIM_EN
Voltage ............... V
IN
+ 7V to V
IN
– 0.3V
PWRGD Voltage (Note 3)
Low Impedance Source ....V
OUT
+ 11V to V
OUT
– 0.3V
Current Fed ..........................................................5mA
PWRGD Voltage ......................... V
IN
+ 80V to V
IN
– 0.3V
PWRGD Current .....................................................10mA
R
CLASS
Current .....................................................100mA
Operating Ambient Temperature Range
LTC4264C ................................................ 0°C to 70°C
LTC4264I ............................................. –40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range ................... –65°C to 150°C
(Notes 1, 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Supply Voltage
IEEE 802.3af System
Signature Range
Classifi cation Range
UVLO Turn-On Voltage
UVLO Turn-Off Voltage
Voltage with Respect to GND Pin
(Notes 5, 6, 7, 8)
●
●
●
●
●
–1.5
–12.5
–37.7
–29.8
–38.9
–30.6
–57
–10.1
–21
–40.2
–31.5
V
V
V
V
V
I
IN_ON
IC Supply Current when On V
IN
= –54V
●
3mA
I
IN_CLASS
IC Supply Current During Classifi cation V
IN
= –17.5V (Note 9)
●
0.55 0.62 0.70 mA
ΔI
CLASS
Current Accuracy During Classifi cation 10mA < I
CLASS
< 75mA, –12.5V ≤ V
IN
≤ –21V
(Notes 10,11)
●
±3.5 %
t
CLASSRDY
Classifi cation Stability Time V
IN
Stepped 0V to –17.5V, I
IN_CLASS
≤3.5% of
Ideal, 10mA < I
CLASS
< 75mA (Notes 10, 11)
●
1ms
R
SIGNATURE
Signature Resistance –1.5V ≤ V
IN
≤ –10.1V, IEEE 802.3af 2-Point
Measurement, SHDN Tied to V
IN
(Notes 6, 7)
●
23.25 26.00 kΩ
R
INVALID
Invalid Signature Resistance –1.5V ≤ V
IN
≤ –10.1V, IEEE 802.3af 2-Point
Measurement, SHDN Tied to GND (Notes 6, 7)
●
10 11.8 kΩ
V
IH_SHDN
SHDN High Level Input Voltage With Respect to V
IN
, High Level = Shutdown
(Note 12)
●
357V
V
IL_SHDN
SHDN Low Level Input Voltage With Respect to V
IN
●
0.45 V
R
INPUT_SHDN
SHDN Input Resistance With Respect to V
IN
●
100 kΩ
V
IH_ILIM
I
LIM_EN
High Level Input Voltage With Repect to V
IN
, High Level Enables Current
Limit (Note 13)
●
4V
12
11
10
9
8
7
1
2
3
4
5
6
GND
NC
PWRGD
PWRGD
V
OUT
V
OUT
SHDN
NC
R
CLASS
I
LIM_EN
V
IN
V
IN
TOP VIEW
13
DE12 PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
= 150°C, θ
JA
= 43°C/W, θ
JC
= 4.3°C/W
EXPOSED PAD (PIN 13) MUST BE SOLDERED TO
AN ELECTRICALLY ISOLATED HEAT SINK
ORDER PART NUMBER DE PART MARKING*
LTC4264CDE
LTC4264IDE
4264
4264
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
*The temperature grade is identifi ed by a label on the shipping container.
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. (Note 4)