LT5401 datasheet(11/16 Pages) AD

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LT5401

Rev. 0

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LT5401

EXTERNAL

CONNECTOR

BAV99

V+

V–

LT5401

UMZ36K

5401 F06

EXTERNAL

CONNECTOR

Figure 4. Voltage Divider

5401 F04

VIN/2

+15V

–15V

OUT1

T1C

T1B

T1A

T2A

IN1

IN2

T2B

T2C

OUT2

R1D

R1C

R1B

R2B

R2C

R2D

R1A

R2A

VIN

LTC2058

VIN/2

+15V

–15V

LTC2058

LT5401

–

Figure 5. Safe Operating Area for Various θJA

Where to Connect the Exposed Pad

The exposed pad is electrically connected to the IN1 and

IN2 pins through 36V bidirectional ESD clamps. Its main

purpose is to reduce the internal temperature rise in appli-

cations dissipating large amounts of power and to provide

a return path to ground for ESD currents. The exposed

pad should be tied to a ground plane though a low resis-

tive path to provide the best level of thermal relief and ESD

protection. The exposed pad can be tied to a low imped-

ance voltage other than ground as long as the absolute

maximum ratings are satisfied.

Thermal Considerations

Each resistor is rated for relatively high power dissipation,

as listed in the Absolute Maximum Ratings section of

this data sheet. To calculate the internal temperature rise

inside the package, add together the power dissipated in

all of the resistors, and multiply by the thermal resistance

coefficient of the package (θJA or θJC as applicable).

For example Equation 2, if 32V is placed across IN1 and

OUT1, the total power dissipation will be:

VTOTAL

RTOTAL

(32)2

(R1A +R1B+R1C+R1D)

≈ 0.5W

(2)

and the total temperature rise inside the package equals

20°C. All 8 resistors will be at the same temperature,

regardless of which resistor dissipates more power. The

junction temperature must be kept within the Absolute

Maximum Rating. At elevated ambient temperatures, this

requirement places a limit on the maximum power dis-

sipation. Figure 5 shows maximum power dissapation

versus ambient temperature for various θJA values.

In addition to limiting the maximum power dissipation,

the maximum voltage across any two pins must also be

kept less than the absolute maximum rating.

ABS MAX LIMITTED

θJA = 40°C/W

θJA = 70°C/W

θJA = 100°C/W

AMBIENT TEMPERATURE (°C)

100

125

150

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

Various θJA

5401 F05

ESD

The LT5401 can withstand up to ±500V of electrostatic

discharge (ESD, human body). ESD beyond this voltage

can damage or degrade the device performance.

To protect the LT5401 against large ESD strikes, external

protection can be added using diodes to the circuit supply

rails or bidirectional Zeners to ground (Figure 6).

Figure 6.

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