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LTC4269CDKD-1#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P44
LTC4269-1
4
42691fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
PWM Controller (Note 10)
Power Supply
V
CC
Turn-On Voltage, V
CC(ON)
l
14 15.3 16 V
V
CC
Turn-Off Voltage, V
CC(OFF)
●
8 9.7 11 V
V
CC
Hysteresis V
CC(ON)
– V
CC(OFF)
●
4 5.6 6.5 V
V
CC
Shunt Clamp V
UVLO
= 0V, I
VCC
= 15mA
●
19.5 20.5 V
V
CC
Supply Current (I
CC
) V
CMP
= Open (Note 11)
●
4 6.4 10 mA
V
CC
Start-Up Current V
CC
= 10V
●
180 400 µA
Feedback Amplifi er
Feedback Regulation Voltage (V
FB
)
●
1.220 1.237 1.251 V
Feedback Pin Input Bias Current R
CMP
Open 200 nA
Feedback Amplifi er Transconductance ∆I
C
= ±10µA
●
700 1000 1400 µmho
Feedback Amplifi er Source or Sink Current
●
25 55 90 µA
Feedback Amplifi er Clamp Voltage V
FB
= 0.9V
V
FB
= 1.4V
2.56
0.84
V
V
Reference Voltage Line Regulation 12V ≤ V
CC
≤ 18V
●
0.005 0.02 %/ V
Feedback Amplifi er Voltage Gain V
CMP
= 1.2V to 1.7V 1400 V/ V
Soft-Start Charging Current V
SFST
= 1.5V 16 20 25 µA
Soft-Start Discharge Current V
SFST
= 1.5V, V
UVLO
= 0V 0.8 1.3 mA
Control Pin Threshold (V
CMP
) Duty Cycle = Min 1 V
Gate Outputs
PG, SG Output High Level
●
6.6 7.4 8 V
PG, SG Output Low Level
●
0.01 0.05 V
PG, SG Output Shutdown Strength V
UVLO
= 0V; I
PG
, I
SG
= 20mA
●
1.6 2.3 V
PG Rise Time C
PG
= 1nF 11 ns
SG Rise Time C
SG
= 1nF 15 ns
PG, SG Fall Time C
PG
, C
SG
= 1nF 10 ns
Current Amplifi er
Switch Current Limit at Maximum V
CMP
V
SENSE
+
●
88 98 110 mV
∆V
SENSE
/∆V
CMP
0.07 V/ V
Sense Voltage Overcurrent Fault Voltage V
SENSE
+
, V
SFST
< 1V
●
206 230 mV
Timing
Switching Frequency (f
OSC
)C
OSC
= 100pF
●
84 100 110 kHz
Oscillator Capacitor Value (C
OSC
) (Note 12) 33 200 pF
Minimum Switch On Time (t
ON(MIN)
) 200 ns
Flyback Enable Delay Time (t
ENDLY
) 265 ns
PG Turn-On Delay Time (t
PGDLY
) 200 ns
Maximum Switch Duty Cycle
●
85 88 %
SYNC Pin Threshold
●
1.53 2.1 V
SYNC Pin Input Resistance 40 k
LTC4269-1
5
42691fc
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Pins with 100V absolute maximum guaranteed for T ≥ 0°C,
otherwise 90V.
Note 3: Active high PWRGD internal clamp self-regulates to 14V with
respect to V
NEG
. V
CC
has internal 19.5V clamp with respect to GND.
Note 4: All voltages are with respect to V
PORTN
pin unless otherwise noted.
Note 5: Input voltage specifi cations are defi ned with respect to LTC4269-1
pins and meet IEEE 802.3af/at specifi cations when the input diode bridge
is included.
Note 6: Signature resistance is measured via the ∆V/∆I method with the
minimum ∆V of 1V. The LTC4269-1 signature resistance accounts for the
additional series resistance in the input diode bridge.
Note 7: An invalid signature after the 1st classifi cation event is mandated
by the IEEE802.3at standard. See the Applications Information section.
Note 8: Class accuracy is with respect to the ideal current defi ned as
1.237/R
CLASS
and does not include variations in R
CLASS
resistance.
Note 9: This parameter is assured by design and wafer level testing.
Note 10: V
CC
= 14V; PG, SG Open; V
CMP
= 1.5V, V
SENSE
–
= 0V, R
CMP
= 1k,
R
tON
= 90k, R
PGDLY
= 27.4k, R
ENDLY
= 90k, unless otherwise specifi ed. All
voltages are with respect to GND.
Note 11: Supply current does not include gate charge current to the
MOSFETs. See the Applications Information section.
Note 12: Component value range guaranteed by design.
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Load Compensation
Load Compensation to V
SENSE
Offset Voltage V
RCMP
with V
SENSE
+
= 0V 1 mV
Feedback Pin Load Compensation Current V
SENSE
+
= 20mV, V
FB
= 1.230V 20 µA
UVLO Function
UVLO Pin Threshold (V
UVLO
)
●
1.215 1.240 1.265 V
UVLO Pin Bias Current V
UVLO
= 1.2V
V
UVLO
= 1.3V
–0.25
–4.50
0
–3.4
0.25
–2.50
µA
µA
LTC4269-1
6
42691fc
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current vs Input Voltage
25k Detection Range Input Current vs Input Voltage Input Current vs Input Voltage
V
PORTP
VOLTAGE (V)
0
0
V
PORTP
CURRENT (mA)
0.1
0.2
0.3
0.4
0.5
2
468
42691 G01
10
T
A
= 25°C
V
PORTP
VOLTAGE (V)
(RISING)
0
0
V
PORTP
CURRENT (mA)
10
20
30
40
50
10
20 30 40
42691 G02
50 60
T
A
= 25°C
CLASS 4
CLASS 3
CLASS 2
CLASS 1
CLASS 0
V
PORTP
VOLTAGE (V)
12
9.5
V
PORTP
CURRENT (mA)
10.5
14
16
42691 G03
10.0
18
20 22
11.0
85°C
–40°C
CLASS 1 OPERATION
Signature Resistance
vs Input Voltage
PWRGD, T2P Output Low Voltage
vs Current
Active High PWRGD
Output Low Voltage vs Current Inrush Current vs Input Voltage
CURRENT (mA)
0
V
PWRGD
– V
PORTN
(V)
V
T2P
– V
PORTN
(V)
0.4
0.6
8
42691 G07
0.2
0
2
4
6
10
0.8
T
A
= 25°C
CURRENT (mA)
0
0
PWRGD (V)
0.4
1.0
0.5
1
42691 G08
0.2
0.8
0.6
1.5
2
T
A
= 25°C
V
PORTP
– V
NEG
= 4V
V
PORTP
VOLTAGE (V)
40
85
CURRENT (mA)
115
45 50
42691 G09
55 60
90
100
105
110
95
90
100
105
110
95
Class Operation vs Time On-Resistance vs Temperature
V
PORTP
VOLTAGE (V)
1
22
V1:
V2:
SIGNATURE RESISTANCE (k)
23
25
26
27
3
5
42691 G04
24
7
9
610
24
8
28
RESISTANCE =
DIODES: HD01
T
A
= 25°C
=
$V
$I
V2 – V1
I
2
– I
1
IEEE UPPER LIMIT
IEEE LOWER LIMIT
LTC4269-1 ONLY
LTC4269-1 + 2 DIODES
V
PORTP
VOLTAGE
10V/DIV
CLASS
CURRENT
10mA/DIV
TIME (10µs/DIV)
42691 G05
T
A
= 25°C
JUNCTION TEMPERATURE (°C)
–50
0.2
RESISTANCE (Ω)
0.4
0.6
0.8
1.0
–25
02550
42691 G06
75 100
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P44

LTC4269CDKD-1#PBF

Mfr. #:
Buy LTC4269CDKD-1#PBF
Manufacturer:
Analog Devices Inc.
Description:
Power Switch ICs - POE / LAN IEEE 802.3at High Power PD Controller with Flyback Switcher
Lifecycle:
New from this manufacturer.
Delivery:
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