Datasheet

LTC4263
3
4263fe
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. V
DD48
– V
SS
= 48V and V
DD5
not driven externally. All voltages are
relative to V
SS
unless otherwise noted. (Notes 2, 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OVLO_OFF
OVLO Turn-Off Voltage V
DD48
– V
SS
Increasing
l
66 70 74 V
V
OVLO_HYS
OVLO Hysteresis
l
0.2 2 V
V
DD5
V
DD5
Supply Voltage Driven Externally
l
4.5 5 5.5 V
V
DD5
Internal Supply Driven Internally
l
4.3 4.4 4.5 V
I
DD48
V
DD48
Supply Current V
DD5
– V
SS
= 5V
Internal V
DD5
l
l
1
2
2
4
mA
mA
I
DD5
V
DD5
Supply Current V
DD5
– V
SS
= 5V
l
12mA
Power MOSFET
R
ON
On-Resistance I = 350mA, Measured From OUT to V
SS
l
1.5 2.4
3.0
Ω
Ω
I
OUT_LEAK
OUT Pin Leakage V
OUT
– V
SS
= V
DD48
– V
SS
= 57V
l
110 μA
R
PU
OUT Pin Pull-Up Resistance to V
DD48
0V ≤ (V
DD48
– V
OUT
) ≤ 5V
l
360 500 640
kΩ
Current Control
I
CUT
Overload Current Threshold Class 0, Class 3, Class 4 (Note 6)
Class 2
Class 1
l
l
l
355
165
95
375
175
100
395
185
105
mA
mA
mA
I
LIM
Short-Circuit Current Limit V
OUT
– V
SS
= 5V
V
DD48
– V
OUT
= 30V
l
l
405
405
425
425
445
445
mA
mA
I
FB
Foldback Current Limit V
DD48
– V
OUT
= 0V (Note 7)
V
DD48
– V
OUT
= 10V
l
l
30
110
60
140
120
180
mA
mA
I
MIN
DC Disconnect Current Threshold
l
5.2 7.5 9.8 mA
I
FAULT
High Speed Fault Current Limit (Note 8)
l
500 650 800 mA
Detection
I
DET
Detection Current First Point, V
DD48
– V
OUT
= 10V
Second Point, V
DD48
– V
OUT
= 3.5V
l
l
235
160
255
180
275
200
μA
μA
V
DET
Detection Voltage Compliance V
DD48
– V
OUT
, Open Port
V
DD48
– V
SS
= 57V
l
21 V
R
DETMIN
Minimum Valid Signature Resistance
l
15.5 17 18.5
kΩ
R
DETMAX
Maximum Valid Signature Resistance
l
27.5 29.7 32
kΩ
R
OPEN
Open Circuit Threshold
l
500 2000
kΩ
Classifi cation
V
CLASS
Classifi cation Voltage V
DD48
– V
OUT
, 0mA ≤ I
CLASS
≤ 50mA
l
16.5 20.5 V
I
CLASS
Classifi cation Current Compliance V
OUT
= V
DD48
l
55 60 75 mA
I
TCLASS
Classifi cation Threshold Current Class 0 – 1
Class 1 – 2
Class 2 – 3 (Note 9)
l
l
l
5.5
13.5
21.5
6.5
14.5
23
7.5
15.5
24.5
mA
mA
mA
Power Management
V
PWRMGT
Power Management Pin Threshold
l
0.98 1 1.02 V
I
PWRMGT
Power Management Pin Output Current Class 0, Class 3, Class 4
Class 1
Class 2
l
l
l
–75.6
–19.6
–34.3
–72.3
–18.8
–32.8
–69
–17.9
–31.3
μA
μA
μA
AC Disconnect
R
OSC
OSC Pin Input Impedance 2V ≤ (V
OSC
– V
SS
) ≤ 3V
l
175 250 325
kΩ
I
OSC
OSC Pin Output Current V
OSC
– V
SS
= 2V
l
–140 140 μA
f
OSC
OSC Pin Frequency V
OSC
– V
SS
= 2V
l
103 110 115 Hz