LTC4252-2CMS#TR [Linear]

LTC4252/LTC4252A - Negative Voltage Hot Swap Controllers; Package: MSOP; Pins: 10; Temperature Range: 0°C to 70°C;


型号：	LTC4252-2CMS#TR
厂家：	Linear
描述：	LTC4252/LTC4252A - Negative Voltage Hot Swap Controllers; Package: MSOP; Pins: 10; Temperature Range: 0°C to 70°C 二极管控制器
文件：	总14页 (文件大小：185K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC4354

Negative Voltage

Diode-OR Controller

and Monitor

FeaTures

DescripTion

The LTC^®4354 is a negative voltage diode-OR controller

that drives two external N-channel MOSFETs. It replaces

two Schottky diodes and the associated heat sink, saving

power and area. The power dissipation is greatly reduced

by using N-channel MOSFETs as the pass transistors.

Power sources can easily be ORed together to increase

total system power and reliability.

Controls N-Channel MOSFETs

Replaces Power Schottky Diodes

Less Than 1µs Turn-off Time Limits Peak

Fault Current

80V Operation

Smooth Switchover without Oscillation

No Reverse DC Current

Fault Output

When first powered up, the MOSFET body diode conducts

the load current until the pass transistor is turned on.

The LTC4354 servos the voltage drop across the pass

transistors to ensure smooth transfer of current from one

transistor to the other without oscillation.

Selectable Fault Thresholds

Available in 8-Lead (3mm × 2mm) DFN and

8-Lead SO Packages

applicaTions

The MOSFETs are turned off in less than 1µs whenever

the corresponding power source fails or is shorted. Fast

turn-off prevents the reverse current from reaching a level

that could damage the pass transistors.

AdvancedTCASystems

–48V Distributed Power Systems

Computer Systems/Servers

Telecom Infrastructure

Optical Networks

A fault detection circuit with an open-drain output capable

ofdrivinganLEDoropto-couplerindicateseitherMOSFET

short, MOSFET open or supply failed.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

Hot Swap, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

Typical applicaTion

–48V Diode-OR

Power Dissipation vs Load Current

–48V_RTN

12k

33k

DIODE (MBR10100)

POWER

SAVED

LOAD

LTC4354

FAULT

DA DB

LED

1µF

FET (IRF3710)

= –48V

4354 TA01

IRF3710

CURRENT (A)

IRF3710

4354 TA01b

4354fc

LTC4354

absoluTe MaxiMuM raTings ^{(Note 1)}

(100µs duration)...............................................50mA

Operating Temperature Range

Output Voltages

LTC4354C................................................ 0°C to 70°C

LTC4354I.............................................–40°C to 85°C

Storage Temperature Range .................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec)...................300°C

GA, GB.........................................–0.3V to V + 0.3V

FAULT ...................................................... –0.3V to 7V

Input Voltages

DA, DB................................................... –0.3V to 80V

Input Current

DA, DB Current ................................... –1mA to 20mA

pin conFiguraTion

TOP VIEW

FAULT

S8 PACKAGE

8-LEAD PLASTIC SO

DDB PACKAGE

8-LEAD (3mm × 2mm) PLASTIC DFN

= 125°C, θ = 150°C/W

JMAX

= 125°C, θ = 76°C/W

JMAX

EXPOSED PAD (PIN 9) IS V , CONNECTION TO PCB OPTIONAL

orDer inForMaTion

Lead Free Finish

TAPE AND REEL (MINI)

LTC4354CDDB#TRMPBF

LTC4354IDDB#TRMPBF

TAPE AND REEL

PART MARKING*

LBBK

PACKAGE DESCRIPTION

TEMPERATURE RANGE

0°C to 70°C

LTC4354CDDB#TRPBF

LTC4354IDDB#TRPBF

8-Lead (3mm × 2mm) Plastic DFN

LBMB

–40°C to 85°C

TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.

LEAD FREE FINISH

LTC4354CS8#PBF

LTC4354IS8#PBF

TAPE AND REEL

PART MARKING

4354

PACKAGE DESCRIPTION

8-Lead Plastic SO

TEMPERATURE RANGE

0°C to 70°C

LTC4354CS8#TRPBF

LTC4354IS8#TRPBF

4354I

8-Lead Plastic SO

–40°C to 85°C

Consult LTC Marketing for parts specified with wider operating temperature ranges.

Consult LTC Marketing for information on nonstandard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

4354fc

LTC4354

elecTrical characTerisTics ^Thel denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. I_CC= 5mA, V_SS= 0V, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

11.75

300

UNITS

Internal Shunt Regulator Voltage

Internal Shunt Regulator Load Regulation

Operating Voltage Range

= 5mA

10.25

∆V

= 2mA to 10mA

200

4.5

0.5

Supply Current

= (V – 0.1V), Note 2

= 5V

1.2

0.8

1.1

GATE Pins Output High Voltage

GATE Pins Pull-Up Current

= 10.25V

= 5V

10.25

GATE

4.75

= 60mV; V

= 5.5V

–15

–30

–60

µA

GATE

= 0V; V

GATE

∆V

Source Drain Sense Threshold Voltage

Source Drain Fault Detection Threshold

Gate Turn-Off Time in Fault Condition

FAULT Pin Output Low

(V – V )

260

0.7

320

1.2

400

µs

(V – V ); V = 7V to V

200

SD(FLT)

= 3300pF; V

≤ 2V; V = –0.4V

GATE SD

OFF

GATE

FAULT

= 5mA

200

µA

FAULT Pin Leakage Current

= 5V

FAULT

Drain Pin Input Current

= 0V

= 80V

–3.5

1.1

–2.5

1.5

–1.5

1.9

µA

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 3: An internal shunt regulator limits the V pin to less than 12V

above V . Driving this pin to voltages beyond the clamp may damage

the part.

Note 4: All currents into pins are positive; all voltages are referenced to

Note 2: I is defined as the current level where the V voltage is lower

unless otherwise specified.

by 100mV from the value with 2mA of current.

4354fc

LTC4354

Typical perForMance characTerisTics ^{Specifications are at T}_A^{= 25°C, I}_CC= 5mA, V_SS= 0V,

unless otherwise noted.

Shunt Regulator Voltage

vs Input Current

Shunt Regulator Voltage

Source Drain Sense Voltage

vs Supply Voltage

vs Input Current at Temperature

12.0

11.5

11.0

10.5

10.0

11.4

11.2

11.0

10.8

10.6

= 10mA

= 5mA

= 2mA

–50 –25

75 100 125

(V)

TEMPERATURE (°C)

(mA)

4354 G02

4354 G03

4354 G01

Source Drain Sense Voltage

vs Temperature

Gate Turn-Off Time vs Temperature

I_GATE(UP)vs ∆V_SD

100

740

720

700

680

660

–50 –25

75 100 125

∆V (mV)

–50 –25

75 100 125

TEMPERATURE (°C)

4354 G04

4354 G05

Fault Threshold Voltage

vs Temperature

Drain Pin Current vs Temperature

Drain Pin Current vs Voltage

290

270

250

230

210

–3.2

–3.0

–2.8

–2.6

–2.4

–1

= 0V

90°C

25°C

–45°C

–0.75

–0.5

–0.25

–50 –25

75 100 125

–50 –25

75 100 125

0.3 0.4

0.5 0.6 0.7 0.8 0.9

(V)

TEMPERATURE (°C)

4354 G06

4354 G08

4354 G09

4354fc

LTC4354

pin FuncTions

DA, DB (Pins 1, 8): Drain Voltage Sense Inputs. These

pinssensesourcedrainvoltagedropacrosstheN-channel

MOSFETs. An external resistor is recommended to pro-

tect these pins from transient voltages exceeding 80V in

extreme fault conditions. For Kelvin sensing, connect

these pins as close to the drains as possible. Connect to

transistorspreventsexcessivereversecurrents.Leavethe

pins open if unused.

(Pins 2, 5): Negative Supply Voltage Input. This is the

device negative supply input and connects to the common

source connection of the N-channel MOSFETs. It also

connects to the source voltage sense input of the servo

amplifiers. For Kelvin sensing, connect Pin 5 as close to

the common source terminal of the MOSFETs as possible.

if unused.

(Pin 3): Positive Supply Voltage Input. Connect this

pin to the positive side of the supply through a resistor.

An internal shunt regulator that can sink up to 20mA

FAULT (Pin 7): Fault Output. Open-drain output that

normally pulls the FAULT pin to V and shunts current

typically clamps V at 11V. Bypass this pin with a 1µF

to turn off an external LED or opto-coupler. In the fault

condition, where the pass transistor is fully on and the

voltage drop across it is higher than the fault threshold,

the FAULT pin goes high impedance, turning on the LED or

opto-coupler. This indicates that one or both of the pass

transistorshavefailedopenorfailedshortcreatingacross

conduction current in between the two power supplies.

capacitor to V .

GA, GB(Pins4, 6):GateDriveOutputs. Gatepinspullhigh

to 10V minimum, fully enhancing the N-channel MOSFET,

when the load current creates more than 30mV of drop

across the MOSFET. When the load current is small,

the gates are actively servoed to maintain a 30mV drop

acrosstheMOSFET.Ifreversecurrentdevelopsmorethan

–140mV of voltage drop across the MOSFET, the pins pull

Connect to V if unused.

EXPOSED PAD (Pin 9): Exposed pad is common to V

and may be left open or connected to Pins 2 and 5.

low to V in less than 1µs. Quickly turning off the pass

FuncTional DiagraM

BV = 11V

30mV

–

AMP A

–

30mV

55k

–

AMP B

55k

FAULT

FAULT DETECTION

4354 FD

4354fc

LTC4354

TiMing DiagraM

100mV

– V

–400mV

GATE

OFF

4354 TD01

operaTion

High availability systems often employ parallel-connected

power supplies or battery feeds to achieve redundancy

and enhance system reliability. ORing diodes have been

a popular means of connecting these supplies at the

point-of-load. The disadvantage of this approach is the

significant forward-voltage drop and resulting efficiency

loss. This drop reduces the available supply voltage and

dissipates significant power. A desirable circuit would

behave like diodes but without the voltage drop and the

resulting power dissipation.

gate is driven fully on and the voltage drop is equal to the

DS(ON) LOAD

• I

When the power supply voltages are nearly equal, this

regulation technique ensures that the load current is

smoothly shared between them without oscillation. The

currentlevelflowingthrougheachpasstransistordepends

on the R

of the MOSFET and the output impedance

DS(ON)

of the supplies.

In the case of supply failure, such as if the supply that

is conducting most or all of the current is shorted to the

return side, a large reverse current starts flowing through

the MOSFET that is on, from any load capacitance and

through the body diode of the other MOSFET, to the sec-

ond supply. The LTC4354 detects this failure condition as

soon as it appears and turns off the MOSFET in less than

1µs. This fast turn-off prevents the reverse current from

ramping up to a damaging level.

TheLTC4354isanegativevoltagediode-ORcontrollerthat

drives two external N-channel MOSFETs as pass transis-

torstoreplaceORingdiodes. TheMOSFETsareconnected

together at the source pins. The common source node is

connected to the V pin which is the negative supply of

the device. It is also connected to the positive inputs of

the amplifiers that control the gates to regulate the volt-

age drop across the pass transistors. Using N-channel

MOSFETs to replace Schottky diodes reduces the power

dissipation and eliminates the need for costly heat sinks

or large thermal layouts in high power applications.

In the case where the pass transistor is fully on but the

voltage drop across it exceeds the fault threshold, the

FAULT pin goes high impedance. This allows an LED or

opto-coupler to turn on indicating that one or both of the

pass transistors have failed.

At power-up, the initial load current flows through the

body diode of the MOSFET and returns to the supply with

the lower terminal voltage. The associated gate pin will

immediately start ramping up and turn on the MOSFET.

The amplifier tries to regulate the voltage drop between

the source and drain connections to 30mV. If the load

current causes more than 30mV of drop, the gate rises

to further enhance the MOSFET. Eventually the MOSFET

The LTC4354 is powered from system ground through a

current limiting resistor. An internal shunt regulator that

can sink up to 20mA clamps the V pin to 11V above V .

A 1µF bypass capacitor across V and V pins filters

supply transients and supplies AC current to the device.

4354fc

LTC4354

applicaTions inForMaTion

Input Power Supply

The LTC4354 tries to servo the voltage drop across the

MOSFET to 30mV in the forward direction by controlling

the gate voltage and sends out a fault signal when the

voltage drop exceeds the 260mV fault threshold. The

The power supply for the device is derived from –48_RTN

through an external current limiting resistor (R ). An

internal shunt regulator clamps the voltage at V pin to

should be small enough to conduct the maximum

DS(ON)

11V. A 1µF decoupling capacitor to V is recommended.

load current while not triggering a fault, and to stay within

It also provides a soft-start to the part.

the MOSFET’s power rating at the maximum load current

should be chosen to accommodate the maximum

(I • R

DS(ON)

supply current requirement of 2mA at the expected input

operating voltage.

Fault Conditions

(V_IN(MIN)− V_Z(MAX)

)

LTC4354 monitors fault conditions and turns on an LED

or opto-coupler to indicate a fault. When the voltage drop

across the pass transistor is higher than the 260mV fault

threshold, theinternalpull-downattheFAULTpinturnsoff

and allows the current to flow through the LED or opto-

coupler.Conditionsthatcausehighvoltageacrossthepass

transistor include: short in the load circuitry, excessive

load current, FET open while conducting current, and FET

short on the channel with the higher supply voltage. The

fault threshold is internally set to 260mV.

R_IN≤

I_CC(MAX)

The power dissipation of the resistor is calculated at the

maximum DC input voltage:

(V_IN(MAX)− V_CC(MIN)

)

P =

R_IN

If the power dissipation is too high for a single resistor,

use multiple low power resistors in series instead of a

single high power component.

In the event of FET open on the channel with the more

negative supply voltage, if the voltage difference is high

enough, the substrate diode on the DA or DB pins will

forward bias. The current flowing out of the pins must

be limited to a safe level (<1mA) to prevent device latch

up. Schottky diodes can be used to clamp the voltage at

the DA and DB pins, as shown in Figure 1.

MOSFET SELECTION

The LTC4354 drives N-channel MOSFETs to conduct the

load current. The important features of the MOSFETs are

on-resistanceR

,themaximumdrain-sourcevoltage

DS(ON)

, and the threshold voltage.

DSS

The gate drive for the MOSFET is guaranteed to be more

than10Vandlessthan12V.Thisallowstheuseofstandard

threshold voltage N-channel MOSFETs. An external zener

LTC4354

MMBD2836LT1

diode can be used to clamp the potential at the V pin

to as low as 4.5V if the gate to source rated breakdown

voltage is less than 12V.

The maximum allowable drain-source voltage, V

(BR)DSS,

must be higher than the supply voltages. If the inputs are

shorted, the full supply voltage will appear across the

MOSFETs.

4354 F01

Figure 1. Method of Protecting the DA and DB Pins from

Negative Inputs. One Channel Shown

4354fc

LTC4354

applicaTions inForMaTion

System Power Supply Failure

ESD devices at the DA and DB pins might break down

and become damaged. The external drain resistors limit

the current into the pins and protect the ESD devices. A

2k resistor is recommended for 48V applications. Larger

resistor values increase the source drain sense threshold

voltage due to the input current at the drain pins.

LTC4354 automatically supplies load current from the

system supply with the more negative input potential. If

this supply is shorted to the return side, a large reverse

current flows from its pass transistor. When this reverse

current creates –140mV of voltage drop across the drain

andsourcepinsofthepasstransistor, theLTC4354drives

the gate low fast and turns it off.

Loop Stability

Theservoloopiscompensatedbytheparasiticcapacitance

ofthepowerN-channelMOSFET.Nofurthercompensation

components are normally required. In the case when a

MOSFET with very small parasitic capacitance is chosen,

a 1000pF compensation capacitor connected across the

gate and source pins might be required.

The remaining system power supply will deliver the load

current through the body diode of its pass transistor until

the channel turns on. The LTC4354 ramps the gate up and

turnsontheN-channelMOSFETtoreducethevoltagedrop

across it, a process that takes less than 1ms depending

on the gate charge of the MOSFET.

Design Example

Drain Resistor

The following demonstrates the calculations involved for

selecting components in a –36V to –72V system with 5A

maximum load current, see Figure 2.

Two resistors are required to protect the DA and DB pins

from transient voltages higher than 80V. In the case

when the supply with the lower potential is shorted to the

return side due to supply failure, a reverse current flows

briefly through the pass transistor to the other supply to

dischargetheoutputcapacitor. Thiscurrentstoresenergy

in the stray inductance along the current path. Once the

pass transistor is turned off, this energy forces the drain

terminal of the FET high until it reaches the breakdown

voltage. If this voltage is higher than 80V, the internal

First,selecttheinputdroppingresistor.Theresistorshould

allow 2mA of current with the supply at –36V.

(36V − 11.5V)

R_IN≤

= 12.25k

2mA

The nearest lower 5% value is 12k.

–48V_RTN

MODULE

INPUT

12k

0.5W

33k

LTC4354

FAULT

LED

2, 5

1µF

4354 F02

IRF3710S

Figure 2. –36V to –72V/5A Design Example

4354fc

LTC4354

applicaTions inForMaTion

The worst-case power dissipation in R :

The LED, D1, requires at least 1mA of current to fully turn

on, therefore R3 is set to 33k to accommodate lowest

input supply voltage of –36V.

(72V − 10.5V)²

P =

= 0.315W

12k

Layout Considerations

Choose a 12k 0.5W resistor or use two 5.6k 0.25W resis-

tors in series.

The following advice should be considered when laying

out a printed circuit board for the LTC4354.

Next,choosetheN-channelMOSFET.The100V,IRF3710S

in DD-Pak package with R

= 23mΩ (max) offers a

The bypass capacitor provides AC current to the device

DS(ON)

good solution. The maximum voltage drop across it is:

so place it as close to the V and V pins as possible.

CC SS

The inputs to the servo amplifiers, DA, DB and V pins,

∆V = (5A)(23mΩ) = 115mV

should be connected directly to the MOSFETs’ terminals

ThemaximumpowerdissipationintheMOSFETisamere:

P = (5A)(115mV) = 0.6W

using Kelvin connections for good accuracy.

Keep the traces to the MOSFETs wide and short. The PCB

tracesassociatedwiththepowerpaththroughtheMOSFETs

should have low resistance.

R1 and R2 are chosen to be 2k to protect DA and DB pins

frombeingdamagedbyhighvoltagespikesthatcanoccur

during an input supply fault.

Typical applicaTions

–5.2V Diode-Or Controller

Positive Low Voltage Diode-OR Combines

Multiple Switching Converters

GND

12V

470Ω

LOAD

LTC4354

FAULT

LTC4354

1µF

GA,GB DA,DB

DA DB

2, 5

1.2V

LED

1µF

100A

= –5.2V

4354 TA02

INPUT

HAT2165 ×6

Si4466DY

240Ω*

12V

Si4466DY

470Ω

1.2V, 200A

OUTPUT BUS

LTC4354

1µF

GA,GB DA,DB

1.2V

100A

INPUT

4354 TA03

HAT2165 ×6

240Ω*

*OPTIONAL PRELOAD

4354fc

LTC4354

Typical applicaTions

–36V to –72V/20A High Current with Parallel FETs

–48V_RTN

RTN

IN1

10k

30k

LTC4354

FAULT

2, 5

LED

IN1

1µF

= –48V

–48V OUT

IRF3710

RTN

IN2

10k

30k

LTC4354

FAULT

2, 5

LED

IN2

1µF

= –48V

4354 TA04

IRF3710

–12V Diode-OR Controller

GND

IN754

BV = 6.8V

10k

1µF

LTC4354

LOAD

FAULT

DA DB

2, 5

LED

= –12V

4354 TA05

Si4862DY

4354fc

LTC4354

package DescripTion

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

DDB Package

8-Lead Plastic DFN (3mm × 2mm)

(Reference LTC DWG # 05-08-ꢀ702 Rev B)

0.6ꢀ 0.05

(2 SIDES)

0.70 0.05

2.55 0.05

ꢀ.ꢀ5 0.05

PACKAGE

OUTLINE

0.25 0.05

0.50 BSC

2.20 0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

R = 0.ꢀꢀ5

0.40 0.ꢀ0

3.00 0.ꢀ0

(2 SIDES)

TYP

R = 0.05

TYP

2.00 0.ꢀ0

(2 SIDES)

PIN ꢀ BAR

TOP MARK

PIN ꢀ

R = 0.20 OR

0.25 × 45°

(SEE NOTE 6)

0.56 0.05

(2 SIDES)

CHAMFER

ꢀ

(DDB8) DFN 0905 REV B

0.25 0.05

0.75 0.05

0.200 REF

0.50 BSC

2.ꢀ5 0.05

(2 SIDES)

0 – 0.05

BOTTOM VIEW—EXPOSED PAD

NOTE:

ꢀ. DRAWING CONFORMS TO VERSION (WECD-ꢀ) IN JEDEC PACKAGE OUTLINE M0-229

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.ꢀ5mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN ꢀ LOCATION ON THE TOP AND BOTTOM OF PACKAGE

4354fc

LTC4354

package DescripTion

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

S8 Package

8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

.189 – .197

(4.801 – 5.004)

.045 ±.005

NOTE 3

.050 BSC

.245

MIN

.160 ±.005

.150 – .157

(3.810 – 3.988)

NOTE 3

.228 – .244

(5.791 – 6.197)

.030 ±.005

TYP

RECOMMENDED SOLDER PAD LAYOUT

.010 – .020

(0.254 – 0.508)

× 45°

.053 – .069

(1.346 – 1.752)

.004 – .010

(0.101 – 0.254)

.008 – .010

(0.203 – 0.254)

0°– 8° TYP

.016 – .050

(0.406 – 1.270)

.050

(1.270)

BSC

.014 – .019

(0.355 – 0.483)

TYP

NOTE:

INCHES

1. DIMENSIONS IN

(MILLIMETERS)

2. DRAWING NOT TO SCALE

3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

SO8 0303

4354fc

LTC4354

revision hisTory ^{(Revision history begins at Rev C)}

REV

DATE

DESCRIPTION

PAGE NUMBER

04/12 Updated package/Order Information format

Changed Figure 2

Updated DDB package drawing

4354fc

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.

LTC4354

Typical applicaTion

–48V Diode-OR Controller with Fuse Monitoring

–48V_RTN

12k

0.5W

33k

LOAD

LTC4354

FAULT

DA DB

MMBD2836LT1

LED

1µF

MMBD2836LT1

= –48V

4354 TA06

IRF540NS

relaTeD parTs

PART NUMBER

LT^®1640AH/LT1640AL

LT4250

DESCRIPTION

COMMENTS

Negative High Voltage Hot Swap™ Controllers in SO-8 Negative High Voltage Supplies from –10V to –80V

–48V Hot Swap Controller

Active Current Limiting, Supplies from –20V to –80V

Fast Active Current Limiting, Supplies from –15V

LTC4251/LTC4251-1/

LTC4251-1

–48V Hot Swap Controllers in SOT-23

LTC4252-1/LTC4252-2/

LTC4252-1A/LTC4252-2A

–48V Hot Swap Controllers in MS8/MS10

–48V Hot Swap Controller with Sequencer

Fast Active Current Limiting, Supplies from –15V,

Drain Accelerated Response

LTC4253

Fast Active Current Limiting, Supplies from –15V,

Drain Accelerated Response, Sequenced Power Good Outputs

LT4351

MOSFET Diode-OR Controller

N-Channel MOSFET, 1.2V to 18V, Fast Switching for High Current

P-Channel MOSFET, 3V to 28V Range

LTC4412

Low Loss PowerPath™ Controller in ThinSOT™

4354fc

LT 0412 REV C • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

 LINEAR TECHNOLOGY CORPORATION 2004

(408) 432-1900 FAX: (408) 434-0507 www.linear.com

LTC4252-2CMS#TR [Linear]

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