900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC4253A-ADJ Datasheet

-48V Hot Swap Controller

No Preview Available !

OBSOLETE:
FOR INFORMATION PURPOSES ONLY
Contact Linear Technology for Potential Replacement
FEATURES
Allows Safe Board Insertion and Removal from a
Live – 48V Backplane
Floating Topology Permits Very High Voltage
Operation
Adjustable Analog Current Limit with Breaker Timer
Fast Response Time Limits Peak Fault Current
Adjustable Undervoltage/Overvoltage Protection
with ±1% Threshold Accuracy
Three Sequenced Power Good Outputs
Adjustable Soft-Start Current Limit
Adjustable Timer with Drain Voltage Accelerated
Response
Latchoff After Fault
Available in 20-Pin SSOP and 20-Pin (4mm × 4mm)
APQFPNLPIaCckAagTeIsOUS
– 48V Distributed Power Systems
Negative Power Supply Control
Central Office Switching
High Availability Servers
Disk Arrays
LTC4253A-ADJ
– 48V Hot Swap Controller
with Sequencer
DESCRIPTIO
The LTC®4253A-ADJ negative voltage Hot SwapTM con-
troller allows a board to be safely inserted and removed
from a live backplane. Output current is controlled by three
stages of current-limiting: a timed circuit breaker, active
current limiting and a fast feedforward path that limits
peak current under worst-case catastrophic fault condi-
tions. The LTC4253A-ADJ latches off after a circuit fault.
Undervoltage and overvoltage detectors with adjustable
thresholds and hystereses disconnect the load whenever
the input supply exceeds the desired operating range. The
LTC4253A-ADJ’s supply input is shunt-regulated, allowing
safe operation with very high supply voltages. A multifunc-
tion timer delays initial start-up and controls the circuit
breaker’s response time. The circuit breaker’s response
time can be accelerated by sensing excessive MOSFET drain
voltage. An adjustable soft-start circuit controls MOSFET
inrush current at start-up.
Three power good outputs can be sequenced to enable
external power modules at start-up or disable them if the
circuit breaker trips. The LTC4253A-ADJ is available in
20-pin SSOP and 20-pin (4mm × 4mm) QFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Patent pending.
TYPICAL APPLICATIO
– 48V/2.5A Hot Swap Controller
– 48V RTN
– 48V RTN
255k 10nF
1%
1µF
1.24k
1%
2.1k
1%
0.536k
1%
– 48V A
20k
1%
B3100*
33nF
0.1µF
0.68µF
B3100*
– 48V B
2.5k
15k(1/4W)/6
VIN
EN2 EN3 VIN
LTC4253A-ADJ
RESET
UVL
UV
OVL
OV
PWRGD1
PWRGD2
SS PWRGD3
SQTIMER
DRAIN
GATE
TIMER
SEL
SENSE
VEE
5.6k 5.6k
1M
IRF530S
10
10nF
0.02
+
100µF
5.6k
LOAD1
EN
LOAD2
EN
LOAD3
EN
4253A TA01
*MDIOOCD2E0S7, INC.
GATE
10V
SS
1V
SENSE
50mV
VOUT
50V
Start-Up Behavior
1ms/DIV
4253A TA01b
4253a-adjf
1


Linear Technology Electronic Components Datasheet

LTC4253A-ADJ Datasheet

-48V Hot Swap Controller

No Preview Available !

LTC4253A-ADJ
ABSOLUTE AXI U RATI GS (Note 1) All voltages referred to VEE
Current into VIN (100µs Pulse) ........................... 100mA
Current into DRAIN (100µs Pulse) ........................ 20mA
VIN, DRAIN Minimum Voltage............................... – 0.3V
Input/Output (Except SENSE
and DRAIN) Voltage ...................................– 0.3V to 16V
SENSE Voltage ..........................................– 0.6V to 16V
Current Out of SENSE (20µs Pulse) .................. – 200mA
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
LTC4253A-ADJC ..................................... 0°C to 70°C
LTC4253A-ADJI .................................. – 40°C to 85°C
Storage Temperature Range
SSOP ................................................ – 65°C to 150°C
QFN .................................................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
SSOP ................................................................ 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
TOP VIEW
ORDER PART
NUMBER
EN2 1
PWRGD2 2
PWRGD1 3
VIN 4
RESET 5
SS 6
SEL 7
SENSE 8
VEE 9
VEE 10
20 PWRGD3
19 EN3
18 SQTIMER
17 TIMER
16 UVL
15 UV
14 OVL
13 OV
12 DRAIN
11 GATE
GN PACKAGE
20-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
LTC4253ACGN-ADJ
LTC4253AIGN-ADJ
VIN 1
RESET 2
SS 3
SEL 4
SENSE 5
20 19 18 17 16
15 SQTIMER
14 TIMER
21 13 UVL
12 UV
11 OVL
6 7 8 9 10
LTC4253ACUF-ADJ
LTC4253AIUF-ADJ
UF PART
MARKING*
UF PACKAGE
20-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 21) IS VEEMUST BE SOLDERED TO PCB
253AJ
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/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
SYMBOL
VZ
RZ
IIN
VLKO
VLKH
VIH
VIL
VHYST
IRESET
IEN
PARAMETER
VIN – VEE Zener Voltage
VIN – VEE Zener Dynamic Impedance
VIN Supply Current
VIN Undervoltage Lockout
VIN Undervoltage Lockout Hysteresis
TTL Input High Voltage
TTL Input Low Voltage
TTL Input Buffer Hysteresis
RESET Input Current
EN2, EN3 Input Current
CONDITIONS
IIN = 2mA
IIN = (2mA to 30mA)
UV = UVL = OV = OVL = 4V, VIN = (VZ – 0.3V)
Coming Out of UVLO (Rising VIN)
VEE VRESET VIN
VEN = 4V (Sinking)
VEN = 0V
MIN TYP MAX UNITS
11.5 13 14.5
V
5
1.1 2
mA
9 10
V
0.25 0.5 0.75
V
2
V
0.8 V
600 mV
±0.1 ±10
µA
60 120 180
±0.1 ±10
µA
µA
4253a-adjf
2


Part Number LTC4253A-ADJ
Description -48V Hot Swap Controller
Maker Linear
Total Page 30 Pages
PDF Download

LTC4253A-ADJ Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 LTC4253A-ADJ -48V Hot Swap Controller
Linear





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy