LT4356IMS-1 Linear Technology, LT4356IMS-1 Datasheet

LT4356IMS-1

Manufacturer Part Number
LT4356IMS-1
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LT4356IMS-1

Family Name
LT4356-1
Package Type
MSOP
Operating Supply Voltage (min)
4V
Operating Supply Voltage (max)
80V
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Product Depth (mm)
3mm
Product Height (mm)
0.86mm
Product Length (mm)
3mm
Mounting
Surface Mount
Pin Count
10
Lead Free Status / Rohs Status
Not Compliant

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Part Number:
LT4356IMS-1#TRPBF
Quantity:
12 000
FEATURES
APPLICATIONS
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n
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n
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n
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n
TYPICAL APPLICATION
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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 to 125°C
Auxiliary Amplifi er for Level Detection Comparator or
Linear Regulator Controller
Available in (4mm × 3mm) 12-Pin DFN,
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
LT4356DE
IRLR2908
GATE
TMR
10Ω
0.1μF
OUT
4356 TA01
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 con-
tinue functioning. The LT4356 also monitors the voltage
drop between the V
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 impend-
ing power down. If the condition persists, the MOSFET is
turned off. After a cool down period, the GATE pin pulls
up turning on the MOSFET again.
The auxiliary 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 for the LT4356-1 during shutdown. The
LT4356-2 differs from the LT4356-1 during shutdown by
reducing the quiescent current to 60μA and keeping alive
the auxiliary amplifi er for uses such as an undervoltage
lockout or always-on regulator.
®
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
LT4356-1/LT4356-2
CC
27V During Transient
and SNS pins to protect against
Surge Stopper
100ms/DIV
C
I
LOAD
TMR
= 6.8μF
= 500mA
4356 TA01b
4356fa
1

Related parts for LT4356IMS-1

LT4356IMS-1 Summary of contents

Page 1

... High Side Switch for Battery Powered Systems n Intrinsic Safety Applications L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 4A, 12V Overvoltage Output Regulator 10mΩ ...

Page 2

LT4356-1/LT4356-2 ABSOLUTE MAXIMUM RATINGS , SHDN ................................................ –60V to 100V V CC SNS ............................. V – 30V or –60V FLT, EN...................................... –0.3V to 80V OUT, A OUT GATE (Note 3) .................................–0. FB, TMR, ...

Page 3

... LT4356CDE-1 LT4356CDE-1#TR LT4356IDE-1 LT4356IDE-1#TR LT4356HDE-1 LT4356HDE-1#TR LT4356CDE-2 LT4356CDE-2#TR LT4356IDE-2 LT4356IDE-2#TR LT4356HDE-2 LT4356HDE-2#TR LT4356CMS-1 LT4356CMS-1#TR LT4356IMS-1 LT4356IMS-1#TR LT4356HMS-1 LT4356HMS-1#TR LT4356CS-1 LT4356CS-1#TR LT4356IS-1 LT4356CS-1#TR LT4356HS-1 LT4356HS-1#TR LT4356CS-2 LT4356CS-2#TR LT4356IS-2 LT4356IS-2#TR LT4356HS-2 LT4356HS-2#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. ...

Page 4

LT4356-1/LT4356-2 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 ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER SHDN Pin Float Voltage V SHDN(FLT) SHDN Pin Current I SHDN t ) Overcurrent Turn Off Delay Time OFF(OC t Overvoltage Turn Off Delay Time OFF(OV) Note 1: ...

Page 6

LT4356-1/LT4356-2 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted SHDN Current vs Temperature SHDN –50 – ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted Overcurrent TMR Current vs (V – OUT 280 OVERCURRENT CONDITION OUT 240 TMR ...

Page 8

LT4356-1/LT4356-2 PIN FUNCTIONS A (DFN and SO Packages Only): Amplifi er Output. OUT Open collector output of the auxiliary amplifi er capable of sinking up to 2mA from 80V. The negative input of the amplifi internally ...

Page 9

BLOCK DIAGRAM 50mV – SHDN A OUT – 1.25V AUXILIARY AMPLIFIER + + IN SNS GATE 14V CHARGE PUMP – OC OUT SHDN CONTROL LOGIC RESTART GATEOFF – 1.35V 0. ...

Page 10

LT4356-1/LT4356-2 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 11

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 12

LT4356-1/LT4356-2 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 13

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 an ...

Page 14

LT4356-1/LT4356-2 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 15

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 16

LT4356-1/LT4356-2 APPLICATIONS INFORMATION V IN 12V D2* SMAJ58CA Figure 8. Overvoltage Regulator with P-Channel MOSFET Reverse Input Protection Shutdown The LT4356 can be shut down to a low current mode when the voltage at the SHDN pin goes below the ...

Page 17

APPLICATIONS INFORMATION Layout Considerations To achieve accurate current sensing, Kelvin connection to the current sense resistor (R SNS mended. The minimum trace width for 1oz copper foil is 0.02" per amp to ensure the trace stays at a reasonable temperature. ...

Page 18

LT4356-1/LT4356-2 TYPICAL APPLICATIONS 24V D2* SMAT70A *DIODES INC. 18 Wide Input Range 5V to 28V Hot Swap with Undervoltage Lockout R Q1 SNS 20mΩ SUD50N03- 118k 10Ω SNS GATE OUT CC 47nF ...

Page 19

TYPICAL APPLICATIONS V IN D2* SMAJ58A UV RISING = 5.04V *DIODES INC. Overvoltage Regulator with Low Battery Detection and Output Keep Alive During Shutdown V IN 12V D2* SMAJ58A *DIODES INC. Overvoltage Regulator with Undervoltage Lockout R Q1 SNS 20mΩ ...

Page 20

LT4356-1/LT4356-2 TYPICAL APPLICATIONS 2.5A, 48V Hot Swap with Overvoltage Output Regulation at 72V and UV Shutdown at 35V V IN 48V D2* SMAT70A 2.5A, 28V Hot Swap with Overvoltage Output Regulation at 36V and UV Shutdown at 15V V IN ...

Page 21

TYPICAL APPLICATIONS Overvoltage Regulator with Reverse Input Protection Up to –80V V IN 12V D1 1N4148 R Q2 SNS 10mΩ IRLR2908 IRLR2908 D2* R4 SMAJ58CA R5 10Ω 2N3904 SNS GATE CC R7 10k D3** IN4148 ...

Page 22

LT4356-1/LT4356-2 PACKAGE DESCRIPTION 3.60 ±0.05 2.20 ±0.05 1.70 ± 0.05 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (NOTE 6) 0.200 REF NOTE: 1. DRAWING PROPOSED ...

Page 23

PACKAGE DESCRIPTION 5.23 (.206) MIN 0.305 ± 0.038 (.0120 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) GAUGE PLANE 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS ...

Page 24

LT4356-1/LT4356-2 PACKAGE DESCRIPTION .050 BSC N .245 MIN .030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 – .020 45 (0.254 – 0.508) .008 – .010 (0.203 – 0.254) .016 – .050 (0.406 – 1.270) NOTE: INCHES 1. ...

Page 25

... Updated drawings in the Typical Applications section Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 26

... ADC and I C LTC4352 Ideal MOSFET ORing Diode LTC4354 Negative Voltage Diode-OR Controller LTC4355 Positive Voltage Diode-OR Controller Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. SENSE 26 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Q2 ...

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