LT4356MPMS-1PBF LINER [Linear Technology], LT4356MPMS-1PBF Datasheet

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LT4356MPMS-1PBF

Manufacturer Part Number
LT4356MPMS-1PBF
Description
Surge Stopper
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT4356MPMS-1PBF.pdf (20 pages)
FEATURES
APPLICATIONS
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L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
12V
V
UNDERVOLTAGE
383k
100k
IN
Stops High Voltage Surges
Adjustable Output Clamp Voltage
Overcurrent Protection
Wide Operation Range: 4V to 80V
Reverse Input Protection to –60V
Low 7μA Shutdown Current, LT4356-1
Adjustable Fault Timer
Controls N-channel MOSFET
Shutdown Pin Withstands –60V to 100V
Fault Output Indication
Guaranteed Operation –55°C to 125°C
Spare Amplifi er for Level Detection Comparator or
Linear Regulator Controller
Available in 10-Pin MSOP or 16-Pin SO Packages
Automotive/Avionic Surge Protection
Hot Swap/Live Insertion
High Side Switch for Battery Powered Systems
Intrinsic Safety Applications
4A, 12V Overvoltage Output Regulator
SHDN
IN
A
V
OUT
CC
+
10mΩ
GND
SNS
LT4356S
IRLR2908
GATE
TMR
10Ω
4356mp12 TA01
0.1μF
OUT
FLT
EN
FB
FAULT
102k
4.99k
V
OUT
SHDN
CONVERTER
DC-DC
V
CC
GND
DESCRIPTION
The LT
transients. It regulates the output during an overvoltage
event, such as load dump in automobiles, by controlling
the gate of an external N-channel MOSFET. The output
is limited to a safe value thereby allowing the loads to
continue functioning. The LT4356MP also monitors the
voltage drop between the V
against overcurrent faults. An internal amplifi er limits the
current sense voltage to 50mV. In either fault condition, a
timer is started inversely proportional to MOSFET stress.
If the timer expires, the FLT pin pulls low to warn of an
impending power-down. If the condition persists, the
MOSFET is turned off. After a cooldown period, the GATE
pin pulls up turning on the MOSFET again.
The spare amplifi er may be used as a voltage detection
comparator or as a linear regulator controller driving an
external PNP pass transistor.
Back-to-back FETs can be used in lieu of a Schottky diode
for reverse input protection, reducing voltage drop and
power loss. A shutdown pin reduces the quiescent current
to less than 7μA during shutdown for the LT4356-1 and
60μA for the LT4356-2 while keeping the reference and
auxiliary amplifi er functioning.
®
LT4356MP-1/LT4356MP-2
4356 surge stopper protects loads from high voltage
20V/DIV
20V/DIV
V
OUT
V
IN
Overvoltage Protector Regulates Output at
12V
12V
80V INPUT SURGE
27V ADJUSTABLE CLAMP
27V During Transient
Surge Stopper
100ms/DIV
CC
and SNS pins to protect
C
I
LOAD
TMR
= 6.8μF
= 500mA
4356mp12 TA01b
4356mp12f
1

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LT4356MPMS-1PBF Summary of contents

Page 1

FEATURES n Stops High Voltage Surges n Adjustable Output Clamp Voltage n Overcurrent Protection n Wide Operation Range 80V n Reverse Input Protection to –60V n Low 7μA Shutdown Current, LT4356-1 n Adjustable Fault Timer n Controls N-channel ...

Page 2

... LT4356MPS-1#PBF LT4356MPS-1#TRPBF LT4356MPS-2#PBF LT4356MPS-2#TRPBF LEAD BASED FINISH TAPE AND REEL LT4356MPMS-1 LT4356MPMS-1#TR LT4356MPS-1 LT4356MPS-1#TR LT4356MPS-2 LT4356MPS-2#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V Operating Voltage Range Supply Current Reverse Input Current R ΔV GATE Pin Output High Voltage GATE I GATE Pin Pull-Up Current ...

Page 4

LT4356MP-1/LT4356MP-2 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted (Shutdown LT4356 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted GATE Pull-Down Current vs Temperature 12 OVERCURRENT CONDITION ΔV = 120mV SNS –50 – ...

Page 6

LT4356MP-1/LT4356MP-2 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted Overvoltage Turn-Off Time vs Temperature 500 OVERVOLTAGE CONDITION V = 1.5V FB 400 300 200 100 0 –50 – ...

Page 7

PIN FUNCTIONS should be limited to no more than 1μ pull-up device is used to turn the part on. The SHDN pin can be pulled up to 100V or below GND by 60V without damage. SNS: Current Sense ...

Page 8

LT4356MP-1/LT4356MP-2 OPERATION Some power systems must cope with high voltage surges of short duration such as those in automobiles. Load circuitry must be protected from these transients, yet high availability systems must continue operating during these events. The LT4356 is ...

Page 9

APPLICATIONS INFORMATION The LT4356 can limit the voltage and current to the load circuitry during supply transients or overcurrent events. The total fault timer period should be set to ride through short overvoltage transients while not causing damage to the ...

Page 10

LT4356MP-1/LT4356MP-2 APPLICATIONS INFORMATION Fault Timer Current The timer current starts at around 2μA with 0.5V or less increasing linearly to 50μA with 75V ing an overvoltage fault (Figure 1). During an overcurrent fault, it ...

Page 11

APPLICATIONS INFORMATION This fi xed early warning period allows the systems to per- form necessary backup or house keeping functions before the power supply is cut off. After V TMR threshold, the pass transistor turns off immediately. Note that during ...

Page 12

LT4356MP-1/LT4356MP-2 APPLICATIONS INFORMATION MOSFET stress is the result of power dissipated within the device. For long duration surges of 100ms or more, stress is increasingly dominated by heat transfer; this is a matter of device packaging and mounting, and heatsink ...

Page 13

APPLICATIONS INFORMATION The LTC4356 does not need extra compensation compo- nents at the GATE pin for stability during an overvoltage or overcurrent event. With transient input voltage step faster than 5V/μs, a gate capacitor, C1, to ground is needed to ...

Page 14

LT4356MP-1/LT4356MP-2 APPLICATIONS INFORMATION SNS 10mΩ Si4435 IRLR2908 V IN 12V D1 D2* 1N5245 SMAJ58CA 15V R6 10k 7 5 SNS GATE LT4356S 9 SHDN 14 A OUT GND TMR 12 1 ...

Page 15

APPLICATIONS INFORMATION Set the current through R1 and R2 during the overvoltage condition to 250μA. 1.25V 250µA Choose 4.99k for R2 16V – 1.25V • 58.88k 1.25V The closest standard ...

Page 16

LT4356MP-1/LT4356MP-2 TYPICAL APPLICATIONS V IN 24V D2* SMAT70A *DIODES INC D2* SMAJ58A *DIODES INC. 16 24V Overvoltage Regulator Withstands 150V IRF640 10Ω SNS GATE OUT ...

Page 17

TYPICAL APPLICATIONS Overvoltage Regulator with Low Battery Detection and Output Keep Alive During Shutdown V IN 12V D2* SMAJ58A 2.5A, 48V Hot Swap with Overvoltage Output Regulation at 72V and UV Shutdown at 35V V IN 48V D2* SMAT70A LT4356MP-1/LT4356MP-2 ...

Page 18

LT4356MP-1/LT4356MP-2 TYPICAL APPLICATIONS 2.5A, 28V Hot Swap with Overvoltage Output Regulation at 36V and UV Shutdown at 15V V IN 28V D2* SMAT70A Overvoltage Regulator with Reverse Input Protection Up to –80V V IN 12V D1 1N4148 ...

Page 19

PACKAGE DESCRIPTION 5.23 (.206) MIN 0.305 ± 0.038 (.0120 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT GAUGE PLANE 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE ...

Page 20

LT4356MP-1/LT4356MP-2 TYPICAL APPLICATION Overvoltage Regulator with Linear Regulator Up to 100mA 2N2905A V IN 12V D2* SMAJ58A R6 100k *DIODES INC. RELATED PARTS PART NUMBER DESCRIPTION LT1641-1/LT1641-2 Positive High Voltage Hot Swap™ Controllers LTC1696 Overvoltage Protection Controller LTC1735 High Effi ...

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