LTC1143CS datasheet(16/20 Pages) LINER

tên linh kiện	LTC1143CS

Giải thích chi tiết về linh kiện	Dual High Efficiency SO-16 Step-Down Switching Regulator Controllers

PDF	20 Pages

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LTC1143/LTC1143L

LTC1143L-ADJ

APPLICATIONS INFORMATION

5) Is the VIN decoupling capacitor (1µF, 0.1µF) con-

nected closely between Pin 13 (5) and GND Pin 3

(11)? This capacitor carries the MOSFET driver peak

currents.

6) For the LTC1143 and LTC1143L, are the SHUT-

DOWN Pins 2 and 10 actively pulled to ground

during normal operation? Both SHUTDOWN pins are

high impedance and must not be allowed to float. Both

pins can be driven by the same external signal if

needed.

7) For the LTC1143L-ADJ, are the VFB Pins 2 and 10

decoupled with 100pF as close to the device as

possible? The VFB line is sensitive to noise pickup and

should be kept away from the P-channel MOSFET.

Figure 9. LTC1143 Layout Diagram (see Board Layout Checklist)

COUT5

CIN3

VOUT5

–

RSENSE5

RSENSE3

P-CH

*MUST BE LOCATED CLOSE TO LTC1143

SHUTDOWN

(3.3V OUTPUT)

CT5

P-CH

CIN5

COUT3

VIN3

VIN5

BOLD LINES INDICATE HIGH CURRENT PATHS

SHUTDOWN

(5V OUTPUT)

VOUT3

–

1000pF*

0.0033

µF

CT3

0.0033

µF

–

0.22

µF*

0.22

µF*

VIN5

VIN3

1143 F09

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