LTC1265CS#TR

更新时间： 2024-01-30 09:48:20

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
16页	230K
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LTC1265CS#TR 数据手册

LTC1265/LTC1265-3.3/LTC1265-5

W U U

APPLICATIONS INFORMATION

Board Layout Checklist

When laying out the printed circuit board, the following

checklist should be used to ensure proper operation of the

LTC1265. These items are also illustrated graphically in

the layout diagram of Figure 5. Check the following in your

layout:

4. Is the Schottky diode closely connected between the

power ground (Pin 12) and switch (Pin 14)?

5. Does the LTC1265 SENSE^–(Pin 7) connect to a point

close to R_SENSEand the (+) plate of C_OUT? In adjustable

applications, the resistive divider, R1 and R2, must be

connected between the (+) plate of C_OUTand signal

ground.

6. AretheSENSE^–andSENSE⁺leadsroutedtogetherwith

minimum PC trace spacing? The 1000pF capacitor

between Pins 7 and 8 should be as close as possible to

the LTC1265.

1. Are the signal and power grounds segregated? The

LTC1265 signal ground (Pin 11) must return to the (–)

plate of C_OUT. The power ground (Pin 12) returns to the

anode of the Schottky diode, and the (–) plate of C_IN,

whose leads should be as short as possible.

2. Does the (+) plate of the C_INconnect to the power V_IN

(Pins 1,13) as close as possible? This capacitor pro-

vides the AC current to the internal P-channel MOSFET

and its driver.

7. Is SHDN (Pin 10) actively pulled to ground during

normal operation? The SHDN pin is high impedance

and must not be allowed to float.

3. Is the input decoupling capacitor (0.1µF) connected

closely between power V_IN(Pins 1,13) and power

ground (Pin 12)? This capacitor carries the high fre-

quency peak currents.

PWR V

LTC1265

0.1µF

PGND

SGND

SHDN

OUT

1000pF

3900pF

SHDN

OUT

N/C (V

SENSE

)

SENSE

–

SENSE

OUT

1000pF

OUTPUT DIVIDER REQUIRED

WITH ADJUSTABLE VERSION ONLY

BOLD LINES INDICATE

HIGH PATH CURRENTS

LTC1265 F05

Figure 5. LTC1265 Layout Diagram (See Board Layout Checklist)

1...7 8 91011 12 13...16

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