LT4356HDE-3#PBF Linear Technology, LT4356HDE-3#PBF Datasheet

IC REG OVP W/LATCHOFF 12DFN

LT4356HDE-3#PBF

Manufacturer Part Number
LT4356HDE-3#PBF
Description
IC REG OVP W/LATCHOFF 12DFN
Manufacturer
Linear Technology
Datasheet

Specifications of LT4356HDE-3#PBF

Voltage - Working
4 ~ 80V
Voltage - Clamping
27V Adj
Technology
Mixed Technology
Number Of Circuits
1
Applications
Automotive
Package / Case
12-DFN
Input Voltage
1.25V
Internal Switch
No
Supply Voltage Range
4V To 80V
Digital Ic Case Style
DFN
No. Of Pins
12
Operating Temperature Range
-40°C To +125°C
Msl
MSL 1 - Unlimited
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
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
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 Latchoff Fault Timer
Controls N-channel MOSFET
Shutdown Pin Withstands –60V to 100V
Fault Output Indication
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-3
IRLR2908
GATE
TMR
10Ω
0.1μF
OUT
43563 TA01
FLT
EN
FB
FAULT
102k
4.99k
V
OUT
SHDN
CONVERTER
DC-DC
V
CC
GND
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 LT4356-3 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 condi-
tion, 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, until the SHDN pin pulls low
momentarily.
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. The SHDN input turns off the part, including
the auxiliary amplifi er, and reduces the quiescent current
to less than 7μA.
®
4356-3 surge stopper protects loads from high
20V/DIV
20V/DIV
V
OUT
V
IN
Overvoltage Protector Regulates Output at
12V
12V
Surge Stopper with
80V INPUT SURGE
27V ADJUSTABLE CLAMP
27V During Transient
Fault Latchoff
100ms/DIV
CC
and SNS pins to protect
C
I
LOAD
TMR
LT4356-3
= 6.8μF
= 500mA
LT4356-3TA01b
43563fa
1

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LT4356HDE-3#PBF 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

... PLASTIC DFN T = 125°C, θ = 43°C/W JMAX JA EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT4356CDE-3#PBF LT4356CDE-3#TRPBF LT4356IDE-3#PBF LT4356IDE-3#TRPBF LT4356HDE-3#PBF LT4356HDE-3#TRPBF LT4356CMS-3#PBF LT4356CMS-3#TRPBF LT4356IMS-3#PBF LT4356IMS-3#TRPBF LT4356HMS-3#PBF LT4356HMS-3#TRPBF LT4356CS-3#PBF LT4356CS-3#TRPBF LT4356IS-3#PBF LT4356IS-3#TRPBF LT4356HS-3#PBF LT4356HS-3#TRPBF ...

Page 3

ORDER INFORMATION LEAD BASED FINISH TAPE AND REEL LT4356IMS-3 LT4356IMS-3#TR LT4356HMS-3 LT4356HMS-3#TR LT4356CS-3 LT4356CS-3#TR LT4356IS-3 LT4356IS-3#TR LT4356HS-3 LT4356HS-3#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on ...

Page 4

LT4356-3 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER I OUT Pin Input Current OUT ΔV OUT Pin High Threshold OUT SHDN Pin Threshold V SHDN SHDN Pin Float Voltage V SHDN(FLT) SHDN Pin Current I ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted SHDN Current vs Temperature SHDN –50 – 100 ...

Page 6

LT4356-3 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted Overcurrent TMR Current vs (V – OUT 280 OVERCURRENT CONDITION OUT 240 ...

Page 7

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 connected ...

Page 8

LT4356-3 BLOCK DIAGRAM 50mV – SHDN A OUT – 1.25V AUXILIARY AMPLIFIER + + IN 8 SNS GATE 14V CHARGE PUMP – OC OUT SHDN CONTROL LOGIC GATEOFF – 1.35V 0.5V + ...

Page 9

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 ...

Page 10

LT4356-3 APPLICATIONS INFORMATION The LT4356-3 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 ...

Page 11

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 starts ...

Page 12

LT4356-3 APPLICATIONS INFORMATION This fi xed early warning period allows time for the system to perform necessary backup or house-keeping functions before power is cut off. When V TMR threshold, the GATE pin pulls low immediately and turns off the ...

Page 13

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 thermal ...

Page 14

LT4356-3 APPLICATIONS INFORMATION The LT4356-3 does not need extra compensation compo- nents at the GATE pin for stability during an overvoltage or overcurrent event. However, with fast, high voltage transient steps at the input, a gate capacitor, C1, to ground ...

Page 15

APPLICATIONS INFORMATION SNS 10mΩ Si4435 IRLR2908 V IN 12V D1 D2* 1N5245 SMAJ58CA 15V R6 10k 5 4 SNS GATE LT4356DE-3 7 SHDN 11 A OUT GND TMR ...

Page 16

LT4356-3 APPLICATIONS INFORMATION First, calculate the resistive divider value to limit V 16V during an overvoltage event 1.25V • 16V = REG R2 Set the current through R1 and R2 during the overvoltage ...

Page 17

TYPICAL APPLICATIONS Wide Input Range 5V to 28V Hot Swap with Undervoltage Lockout 24V D2* SMAT70A *DIODES INC SNS 0.02Ω SUD50N03- 118k 10Ω SNS GATE OUT CC 47nF SHDN A ...

Page 18

LT4356-3 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 ...

Page 19

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 *DIODES INC. **OPTIONAL COMPONENT ...

Page 20

LT4356-3 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 VARIATION ...

Page 21

Plastic MSOP (Reference LTC DWG # 05-08-1661) 0.889 ± 0.127 (.035 ± .005) 5.23 3.20 – 3.45 (.206) (.126 – .136) MIN 0.305 ± 0.038 0.50 (.0120 ± .0015) (.0197) TYP BSC RECOMMENDED SOLDER PAD LAYOUT DETAIL “A” 0.254 ...

Page 22

LT4356-3 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 23

... Text Added to Applications Information Update Typical Applications 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. LT4356-3 ...

Page 24

... 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 Linear Technology Corporation 24 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Q2 ...

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