LT5400BMPMS8E-2#TRPBF Linear Technology, LT5400BMPMS8E-2#TRPBF Datasheet - Page 5

• Manufacturer Part Number: LT5400BMPMS8E-2#TRPBF
• Manufacturer: Linear Technology

Specifications of LT5400BMPMS8E-2#TRPBF

• Pin Count: 8
• Lead Free Status / Rohs Status: Compliant

APPLICATIONS INFORMATION
TYPICAL PERFORMANCE CHARACTERISTICS
Where to Connect the Exposed Pad
The exposed pad is not DC connected to any resistor
terminal. Its main purpose is to reduce the internal tem-
perature rise when the application calls for large amounts
of dissipated power in the resistors. The exposed pad can
be tied to any voltage (such as ground) as long as the
absolute maximum ratings are observed.
There is capacitive coupling between the resistors and the
exposed pad, as specified in the Electrical Characteristics
table. To avoid interference, do not tie the exposed pad to
noisy signals or noisy grounds.
Connecting the exposed pad to a quiet AC ground is
recommended as it acts as an AC shield and reduces the
amount of resistor-resistor capacitance.
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 (θ
For example, if each resistor dissipates 250mW, for a total
of 1W, the total temperature rise inside the package equals
40°C. All 4 resistors will be at the same temperature,
30
25
20
15
10
5
0
–1 –0.8–0.6–0.4–0.2 0 0.2 0.4 0.6 0.8 1
Distribution of Matching Drift
JA
or θ
ppm/°C
JC
as applicable).
5400 G01
regardless of which resistor dissipates more power. The
junction temperature must be kept within the Absolute
Maximum Rating. At elevated ambient temperatures, this
places a limit on the maximum power dissipation.
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.
ESD
The LT5400 can withstand up to ±1kV of electrostatic
discharge (ESD, human body). To achieve the highest
precision matching, the LT5400 is designed without explicit
ESD internal protection diodes. ESD beyond this voltage
can damage or degrade the device including causing
pin-to-pin shorts.
To protect the LT5400 against large ESD strikes, external
protection can be added using diodes to the circuit supply
rails or bidirectional Zeners to ground (Figure 1).
CONNECTOR
–3
–4
–1
–2
–5
EXTERNAL
5
4
3
2
1
0
0
Change in Matching vs Time
BAV99
400
V
–
V
TIME (HOURS)
800
+
LT5400
Figure 1
1200
CONNECTOR
EXTERNAL
1600
5400 G02
2000
LT5400
5400 F01
LT5400
UMZ36K
5
5400f