Datasheet

LT4256-3
2
42563fa
(Note 1)
Supply Voltage (V
CC
) ................................ –0.3 to 100V
SENSE, PWRGD ....................................... – 0.3 to 100V
GATE Voltage (Note 2) .................... – 0.3V to V
CC
+ 10V
GATE Maximum Current ..................................... 200µA
V
OUT
.......................................................... –3V to 100V
FB, UV, OPEN ............................................. – 0.3 to 44V
OV .............................................................. –0.3 to 18V
RETRY ........................................................ – 0.3 to 15V
TIMER Voltage ......................................... –0.3V to 4.3V
Maximum Input Current (TIMER) ....................... 100µA
Operating Temperature
LT4256-3C ............................................. 0°C to 70°C
LT4256-3I ......................................... –40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ABSOLUTE AXI U RATI GS
W
WW
U
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Note: NC is a pin that is “Not Connected.”
PACKAGE/ORDER I FOR ATIO
UUW
ORDER PART
NUMBER
GN PART MARKING
42563
42563I
LT4256-3CGN
LT4256-3IGN
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 48V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Operating Voltage ● 10.8 80 V
I
CC
Operating Current 1.8 3.9 mA
V
UVLH
Undervoltage Threshold V
CC
Low-to-High Transition ● 3.96 4 4.04 V
V
UVHYS
Hysteresis 0.25 0.4 0.55 V
I
INUV
UV Input Current UV ≥ 1.2V –0.1 –1 µA
UV = 0V –1.5 –3 µA
V
UVRTH
Fault Latch Reset Threshold Voltage ● 0.4 0.85 1.2 V
V
OVLH
Overvoltage Threshold V
CC
Low-to-High Transition ● 3.96 4 4.04 V
V
OVHYS
Hysteresis 0.25 0.4 0.55 V
I
INOV
OV Input Current 0V ≤ OV < 7V 0.1 1 µA
V
OPEN
Open-Circuit Voltage Threshold (V
CC
– V
SENSE
) ● 1.5 3 6.5 mV
V
OLOPEN
OPEN Output Low Voltage I
O
= 2mA 0.20 0.5 V
I
O
= 5mA 0.75 1.3 V
I
INOPEN
Leakage Current V
OPEN
= 5V 0.1 1 µA
V
SENSETRIP
SENSE Pin Trip Voltage (V
CC
– V
SENSE
) FB = 0V ● 71422 mV
FB ≥ 2V
● 45 55 65 mV
I
INSNS
SENSE Pin Input Current V
SENSE
= V
CC
40 70 µA
I
PU
GATE Pull-Up Current Charge Pump On, ∆V
GATE
= 7V ● –16 –32 –63 µA
I
PD
GATE Pull-Down Current Any Fault, V
GATE
> V
OUT
40 62 80 mA
I
PDL
V
OUT
Pull-Down Current, Fault Condition Any Fault, V
GATE
= V
OUT
+ ∆V
GATEL
, 130 µA
V
OUT
= 48V
∆V
GATE
External N-Channel Gate Drive (Note 2) V
GATE
– V
OUT
, 10.8V ≤ V
CC
≤ 20V ● 4.5 8.8 12.5 V
20V ≤ V
CC
≤ 80V ● 10 11.6 12.8 V
∆V
GATEL
External N-Channel Gate Drive, Fault Condition V
GATE
– V
OUT
, V
OUT
= 48V –2 V
1
2
3
4
5
6
7
8
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
16
15
14
13
12
11
10
9
UV
OV
NC
OPEN
PWRGD
NC
RETRY
GND
V
CC
SENSE
NC
GATE
V
OUT
NC
FB
TIMER
T
JMAX
= 125°C, θ
JA
= 130°C/W
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/