LT4356CDE-1-PBF LINER [Linear Technology], LT4356CDE-1-PBF Datasheet

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LT4356CDE-1-PBF

Manufacturer Part Number
LT4356CDE-1-PBF
Description
Overvoltage Protection Regulator and Inrush Limiter
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT4356CDE-1-PBF.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
Adjustable Fault Timer
Controls N-Channel MOSFET
Shutdown Pin Withstands –60V to 100V
Fault Output Indication
Spare Amplifi er for Level Detection Comparator or
Linear Regulator Controller
Available in (4mm × 3mm) 12-Pin DFN or 10-Pin
MSOP Packages
Automotive/Avionic Surge Protection
Hot Swap/Live Insertion
High Side Switch for Battery Powered Systems
4A, 12V Overvoltage Output Regulator
SHDN
IN
A
V
OUT
CC
+
10mΩ
GND
SNS
LT4356DE-1
IRLR2908
GATE
TMR
10Ω
0.1μF
OUT
43561 TA01
FLT
EN
FB
FAULT
102k
4.99k
V
OUT
SHDN
CONVERTER
DC-DC
V
CC
GND
Regulator and Inrush Limiter
DESCRIPTION
The LT
voltage 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 LT4356-1 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.
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.
Overvoltage Protection
®
4356-1 surge stopper protects loads from high
20V/DIV
20V/DIV
V
OUT
V
IN
12V
12V
Overvoltage Protector Regulates
80V INPUT SURGE
Output at 27V During Transient
27V CLAMP
100ms/DIV
CC
and SNS pins to protect
LT4356-1
43561 TA01b
43561fd
1

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LT4356CDE-1-PBF 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 n Adjustable Fault Timer n Controls N-Channel MOSFET ...

Page 2

... LT4356HDE-1#PBF LT4356HDE-1#TRPBF LT4356CMS-1#PBF LT4356CMS-1#TRPBF LT4356IMS-1#PBF LT4356IMS-1#TRPBF LT4356HMS-1#PBF LT4356HMS-1#TRPBF LEAD BASED FINISH TAPE AND REEL LT4356CDE-1 LT4356CDE-1#TR LT4356IDE-1 LT4356IDE-1#TR LT4356HDE-1 LT4356HDE-1#TR LT4356CMS-1 LT4356CMS-1#TR LT4356IMS-1 LT4356IMS-1#TR LT4356HMS-1 LT4356HMS-1#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. ...

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

LT4356-1 TYPICAL PERFORMANCE CHARACTERISTICS unless otherwise noted. I (Shutdown (V) CC 43561 G01 Reverse Current vs Reverse Voltage –20 V ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS unless otherwise noted. Δ GATE GATE 12V OUT (μA) GATE 43561 G09 Overvoltage TMR Current vs ...

Page 6

LT4356-1 TYPICAL PERFORMANCE CHARACTERISTICS unless otherwise noted. Overvoltage Turn-Off Time vs Temperature 500 OVERVOLTAGE CONDITION V = 1.5V FB 400 300 200 100 0 –50 – TEMPERATURE (°C) PIN FUNCTIONS (DE/MS) A (Pin 11 DE Only): Amplifi er ...

Page 7

The leakage current to ground at the pin should be limited to no more than 1μ pull up device is used to turn the part on. The SHDN pin ...

Page 8

LT4356-1 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 LT4356-1 is ...

Page 9

APPLICATIONS INFORMATION The LT4356-1 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

LT4356-1 APPLICATIONS INFORMATION V TMR( 5μA TMR 1.35 1. 75V 50μA) TMR V = 10V 8μA) TMR 0. FLT WARNING = 15ms/μF = 20ms/μ 93.75ms/μF FLT ...

Page 11

APPLICATIONS INFORMATION Figure 3. Prototypical Transient Waveform ramp of rise time t , reaching a peak voltage exponentially decaying back common automotive transient specifi cation ...

Page 12

LT4356-1 APPLICATIONS INFORMATION count for circuit tolerances this fi gure should be doubled 2 to 13.2W s. Limiting Inrush Current and GATE Pin Compensation The LT4356-1 limits the inrush current to any load capaci- tance by controlling the GATE pin ...

Page 13

APPLICATIONS INFORMATION R Q2 SNS 10mΩ IRLR2908 V IN 12V D2* R4 SMAJ58CA R5 Q3 10Ω 1M 2N3904 D1 R7 1N4148 10k 5 SNS 0.1μF R6 10Ω LT4356DE-1 7 SHDN 11 A OUT ...

Page 14

LT4356-1 APPLICATIONS INFORMATION Design Example As a design example, take an application with the follow- ing specifi cations 14V DC with transient 80V, V ≤ 16V, current limit (I OUT LIM detection at ...

Page 15

TYPICAL APPLICATIONS V IN 24V D2* SMAT70A *DIODES INC. 24V Overvoltage Regulator Withstands 150V IRF640 10Ω SNS GATE OUT LT4356DE-1 7 SHDN 8 FLT 9 ...

Page 16

LT4356-1 TYPICAL APPLICATIONS Overvoltage Regulator with Low Battery Detection and Output Keep Alive During Shutdown V IN 12V D2* SMAJ58A R4 402k C2 0.1μF R6 10Ω R5 105k *DIODES INC 0. SNS 10mΩ IRLR2908 R3 10Ω ...

Page 17

TYPICAL APPLICATIONS 2.5A, 48V Hot Swap with Overvoltage Output Regulation at 72V and UV Shutdown at 35V V IN 48V D2* SMAT70A *DIODES INC. 2.5A, 28V Hot Swap with Overvoltage Output Regulation at 36V and UV Shutdown at 15V V ...

Page 18

LT4356-1 PACKAGE DESCRIPTION 3.60 ±0.05 1.70 ±0.05 2.20 ±0.05 (2 SIDES) 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (NOTE 6) 0.200 REF NOTE: 1. DRAWING PROPOSED VARIATION OF VERSION (WGED) IN ...

Page 19

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 20

LT4356-1 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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