42681fc
LTC4268-1
3
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.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
PORT
Supply Voltage
IEEE 802.3af System
Signature Range
Classification Range
UVLO Turn-On Voltage
UVLO Turn-Off Voltage
Voltage With Respect to V
PORTP
Pin
(Notes 6, 7, 8, 9, 10)
l
l
l
l
l
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
V
TURNON
V
CC
Turn-On Voltage
Voltage With Respect to GND
l
14
15.3
16.6
V
V
TURNOFF
V
CC
Turn-Off Voltage
Voltage With Respect to GND
l
8
9.7
11
V
V
HYST
V
CC
Hysteresis
V
TURNON
V
TURNOFF
l
4
5.6
7.2
V
V
CLAMP
V
CC
Shunt Regulator Voltage
I
VCC
= 15mA, V
UVLO
= 0V, Voltage With
Respect to GND
l
19.5
20.2
V
I
VCC
V
CC
Supply Current
V
CMP
= Open (Note 11)
l
4
6.4
10
mA
I
VCC_START
V
CC
Start-Up Current
V
CC
= 10V
l
180
400
礎
V
FB
Feedback Regulation Voltage
l
1.22
1.237
1.251
V
I
FB_BIAS
Feedback Pin Input Bias Current
R
CMP
Open
200
nA
g
m
Feedback Amplifier
Transconductance
l
700
1000
1400
A/V
I
FB
Feedback Amplifier Source or Sink
Current
l
25
55
90
礎
V
FBCLAMP
Feedback Amplifier Clamp Voltage
V
FB
= 0.9V
V
FB
= 1.4V
2.56
0.84
V
V
%V
REF
Reference Voltage Line Regulation
12V d V
CC
d 18V
l
0.005
0.02
%/V
A
V
Feedback Amplifier Voltage Gain
V
CMP
= 1.2V to 1.7V
1500
V/V
I
SFST
Soft-Start Charging Current
V
SFST
= 1.5V
16
20
25
礎
I
SFST
Soft-Start Discharge Current
V
SFST
= 1.5V, V
UVLO
= 0V
0.8
1.3
mA
V
CMP_THLD
Control Pin Threshold (VCMP)
Duty Cycle = Min
1
V
V
PG_HIGH
,
V
SG_HIGH
PG, SG, Output High Level
l
6.6
7.4
8
V
V
PG_LOW
,
V
SG_LOW
PG, SG, Output Low Level
l
0.01
0.05
V
V
PG_SHDN
,
V
SG_SHDN
PG, SG, Output Shutdown Strength
V
UVLO
= 0V; I
PG
, I
SG
= 20mA
l
1.4
2.3
V
t
PG_RISE
,
t
SG_RISE
PG, SG Rise Time
C
PG
, C
SG
= 1nF
15
ns
t
PG_FALL
,
t
SG_FALL
PG, SG Fall Time
C
PG
, C
SG
= 1nF
15
ns
V
SENSE_LIM
Switch Current Threshold at Maximum
V
CMP
Measured at V
SENSE+
l
88
100
110
mV
DV
SENSE
/DV
CMP
Sense Threshold vs V
CMP
0.07
V/V
V
SENSE_OC
Sense Pin Overcurrent Fault Voltage
V
SENSE+
, V
SFST
< 1V
l
205
230
mV
V
IH_SHDN
Shutdown High Level Input Voltage
With Respect to V
PORTN
High Level = Shutdown (Note 12)
l
3
57
V
V
IL_SHDN
Shutdown Low Level Input Voltage
With Respect to V
PORTN
l
0.45
V
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