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LTC1266

LTC1266-3.3/LTC1266-5

APPLICATIO S I FOR ATIO

times helpful in eliminating instabilities at high input

voltage and high output loads.

6. Is the Shutdown (Pin 11) actively pulled to ground

during normal operation? The Shutdown pin is high

impedance and must not be allowed to float. The Select

(Pins 3 and 4) are also high impedance and must be tied

high or low depending on the application.

3. Are the Sense – and Sense + leads routed together with

minimum PC trace spacing? The 1000pF capacitor

between Pins 8 and 9 should be as close as possible to

the LTC1266.

4. Does the (+) plate of CIN connect to the source of the

topside MOSFET as closely as possible? This capacitor

provides the AC current to the topside MOSFET.

5. A 0.1

µF to 1µF decoupling capacitor connected be-

tween VIN (Pin 5) and ground is optional, but is some-

TYPICAL APPLICATIO S (Layout Assist Schematics)

Figure 11. Low Dropout, 3.3V/3A High Efficiency Regulator

TDRIVE

PWR VIN

PINV

BINH

VIN

ITH

SENSE–

BDRIVE

PGND

LBOUT

LBIN

SGND

SHDN

SENSE+

LTC1266-3.3

µF

1000pF

SHUTDOWN

BINH

RSENSE

0.033

Ω

µH

Si9410DY

MBRS140T3

Si9430DY

CIN

100

µF

25V

VIN

≈3.9V TO 18V

(VIN(MIN) = 3.5V IF ILOAD < 0.8A)

COUT

220

µF

10V

VOUT

3.3V

3300pF

220pF

LTC1266 • F11

DALE LPT4545-A001

COILTRONICS CTX10-4

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