Datasheet

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LT4356

FEATURES

Stuffed for Automotive Applications up to 3A

Triple Layout for D-Pak, D2-Pak or S-8 M OSFETs

0.093-inch Turret Holes Accommodate 12 AW G W ire

LEDs Show Input, Outputs, Fault and Enable

Latches Off after Faults

Easily M odified for up to 20A

AP P L IC ATIO N S

Servers, Routers, Switches

M ass Storage

Fan Trays

Automotive M odules

D ESC RIP TIO N

Demonstration Circuit DC-1018B-C showcases the

LT4356-3 Surge Stopper in a 12V, 3A application. Input

transients of up to 60V are limited to 16V at the output;

sustained overvoltage conditions cause the limiter to trip

off and retry after the overvoltage is removed.

LEDs indicate the presence of +12V input and output, as

well as state of the fault output, FLT# and enable output,

EN.

, LTC, LTM , LT, Burst M ode, OPTI-LOOP, Over-The-Top and PolyPhase are registered

trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy

Drive, FilterCAD, H ot Swap, LinearView, µM odule, M icropower SwitcherCAD, M ultimode

Dimming, No Latency , No Latency Delta-Sigma, No R

SENSE

, O perational Filter, PanelProtect,

PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT,

UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names

may be trademarks of the companies that manufacture the products.

P ERFO RM AN C E SUM M ARY

Specifications are at TA = 25°C

SYM BOL PARAM ETER CONDITIONS M IN TYP M AX UNITS

Input Operating Range

4 12 60 V

Peak Input Voltage Clipped by Transient Voltage Suppressor 100 V

LIM IT

Output Limiting Voltage 15.3 16 16.7 V

OUT

M aximum Load Current

3.5

Board Layout

DEMO

CIR CU IT

1 0 1 8

Q U ICK S TA R T G U IDE

L T 4 35 6

Ov e rv o lta g e P ro te c tio n

R e g u la to r

Summary of content (5 pages)

PAGE 1
DEMO CIR CU IT 1 0 1 8 B-C Q U ICK S TA R T GLT4356 U IDE L T 4 35 6 -3 Ov e rv o lta g e P ro te c tio n R e g u la to r FEATURES D ESC RIP TIO N Stuffed for Automotive Applications up to 3A Triple Layout for D-Pak, D2-Pak or S-8 M OSFETs 0.093-inch Turret Holes Accommodate 12 AW G W ire LEDs Show Input, Outputs, Fault and Enable Latches Off after Faults Easily M odified for up to 20A Demonstration Circuit DC-1018B-C showcases the LT4356-3 Surge Stopper in a 12V, 3A application.
PAGE 2
LT4356 DC1018B-C is a 4-layer board. There are planes for input, output, drain and ground;these are replicated on each layer. DC1018B-C is stuffed with the LT4356CDE-3 which has a 7µA typicalshutdown current. The LT4356CDE3 latches off after faults, so the OVLO components are not stuffed. R8 is included to provide a modest but predictable rise time on the SHDN# pin and ensure proper reset of the internalfault latch. to the bottom of the board, R3B. This is the gate resistor for the S-8 M OSFET.
PAGE 3
LT4356 the ON state. SHDN# is pulled high internally. If this turret is left open, the board will turn on when power is applied. Short this turret to ground to turn off the LT4356-3. FLT# pulls low after a TM R interval if there is a sustained input overvoltage, and does so 2ms before the output shuts down. Otherwise FLT# is high, pulled up by LED4 and the 5V LED Supply. EN is an output. It goes high when the 12V output rises to within 700mV of the input.
PAGE 4
LT4356 applied. To test the voltage limiter, apply a transient to the 12V Input. One method of coupling a transient without backfeeding the 12V supply is shown in the Connection Diagram, attached. If the input transient is short the output simply limits at 16V and then recovers to 12V. If the transient is sustained, the output willrise to 16V, regulate there and then shut down.
PAGE 5
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