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LTC4268-1
4
42681fc
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
R
INPUT_SHDN
Shutdown Input Resistance
With Respect to V
PORTN
l    100
kW
V
IH_ILIM
I
LIM_EN
 High Level Input Voltage
With Respect to V
PORTN
 (Note 13)
High Level Enables Current Limit
l
4
V
V
IL_ILIM
I
LIM_EN
 Low Level Input Voltage
With Respect to V
PORTN
 (Note 13)
l
1
V
I
VPORTN
V
PORTN
 Supply Current
V
PORTN
 = 54V
l
3
mA
I
IN_CLASS
IC Supply Current During Classification    V
PORTN
 = 17.5V, V
NEG
 Tied to V
PORTP
 
(Note 14)
l
0.55
0.62
0.70
mA
DI
CLASS
Current Accuracy During Classification    10mA < I
CLASS
 < 75mA
12.5V d V
PORTN
 d 21V (Notes 15, 16)
l
?.5
%
R
SIGNATURE
Signature Resistance
1.5V d V
PORTN
 d 10.1V, SHDN Tied
to V
PORTN
, IEEE 802.3af Two-Point
Measurement (Notes 8, 9)
l
23.25
26
kW
R
INVALID
Invalid Signature Resistance
1.5V d V
PORTN
 d 10.1V, SHDN Tied
to V
PORTP
, IEEE 802.3af Two-Point
Measurement (Notes 8, 9)
10
11.8
kW
V
PWRGD_OUT
Active Low Power Good Output Voltage   I = 1mA, V
PORTN
 = 54V, PWRGD
Referenced to V
PORTN
l
0.5
V
I
PWRGD_LEAK
Active Low Power Good Output Leakage   V
PORT
 = 0V, V
PWRGD
 = 57V
l
1
礎
V
PWRGD_OUT
Active High Power Good Output Voltage   I = 0.5mA, V
PORTN
 = 52V, V
NEG
 = 4V
PWRGD Referenced to V
NEG
 (Note 17)
l
0.35
V
V
PWRGD_VCLAMP
Active High Power Good Voltage
Limiting Clamp
I = 2mA, V
NEG
 = 0V, PWRGD Referenced
to V
NEG
 (Note 3)
l
12
14
16.5
V
I
PWRGD_LEAK
Active High Power Good Output Leakage  V
PWRGD
 = 11V With Respect to V
NEG
,
V
NEG
 = V
PORTN
 = 54V
l
1
礎
R
ON
On-Resistance
I = 700mA, V
PORTN
 = 48V, Measured
from V
PORTN
 to V
NEG
 (Note 16)
l
0.5
0.6
0.8
W
W
I
OUT_LEAK
V
OUT
 Leakage
V
PORTN
 = 57V, V
PORTP
 = SHDN = V
NEG
 =
0V (Note 15)
l
1
礎
I
LIM_HI
Input Current Limit, High Level
V
PORTN
 = 54V, V
NEG
 = 53V I
LIM_EN
 
Floating (Notes 18, 19)
l
700
750
800
mA
I
LIM_LO
Input Current Limit, Low Level
V
PORTN
 = 54V, V
NEG
 = 53V
(Notes 18, 19)
l
250
300
350
mA
I
LIM_DISA
Safeguard Current Limit When I
LIM
 is
Disabled
V
PORTN
 = 54V,
V
NEG
 = 52.5V I
LIM_EN
 Tied to V
PORTN
 
(Notes 18, 19, 20)
1.2
1.45
1.65
A
f
OSC
Oscillator Frequency
C
OSC
 = 100pF
l
84
100
110
kHz
C
OSC
Oscillator Capacitor Value
(Note 21)
33
200
pF
t
ON(MIN)
Minimum Switch on Time
200
ns
t
ENDLY
Flyback Enable Delay Time
265
ns
t
PGDLY
PG Turn-On Delay Time
200
ns
DC
ON(MAX)
Maximum Switch Duty Cycle
l
85
88
%
V
SYNC
SYNC Pin Threshold
l
1.53
2.1
V
R
SYNC
SYNC Pin Input Resistance
40
kW
elecTrical characTerisTics
 
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
 = 25癈. V
CC
 = 14V, SG open, V
CMP
 = 1.5V, V
SENSE
 = 0V, R
CMP
 = 1k, R
tON
 = 90k,
R
PGDLY
 = 27.4k, R
ENDLY
 = 90k, unless otherwise specified.
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