LTC3370 datasheet(11/24 Pages) LINER

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LTC3370

3370fb

For more information www.linear.com/LTC3370

4A Buck Regulator Transient

Response (Burst Mode Operation)

4A Buck Regulator Transient

Response (Forced Continuous

Mode)

1A Buck Regulator Transient

Response (Forced Continuous

Mode)

Typical perForMance characTerisTics T

A = 25°C, unless otherwise noted.

50µs/DIV

VOUT

100mV/DIV

AC-COUPLED

INDUCTOR

CURRENT

200mA/DIV

0mA

3370 G46

LOAD STEP = 100mA TO 700mA

VIN = 3.3V

VOUT = 1.8V

50µs/DIV

VOUT

100mV/DIV

AC-COUPLED

INDUCTOR

CURRENT

1A/DIV

0mA

3370 G47

LOAD STEP = 400mA TO 2.8A

VIN = 3.3V

VOUT = 1.8V

50µs/DIV

VOUT

100mV/DIV

AC-COUPLED

INDUCTOR

CURRENT

1A/DIV

0mA

3370 G48

LOAD STEP = 400mA TO 2.8A

VIN = 3.3V

VOUT = 1.8V

pin FuncTions

VINA (Pin 1): Power Stage A Input Supply. Bypass to GND

with a 10µF or larger ceramic capacitor.

SWA (Pin 2): Power Stage A Switch Node. External induc-

tor connects to this pin.

SWB (Pin 3): Power Stage B Switch Node. External induc-

tor connects to this pin.

VINB (Pin 4): Power Stage B Input Supply. Bypass to GND

with a 10µF or larger ceramic capacitor.

VINC (Pin 5): Power Stage C Input Supply. Bypass to GND

with a 10µF or larger ceramic capacitor.

SWC (Pin 6): Power Stage C Switch Node. External induc-

tor connects to this pin.

SWD (Pin 7): Power Stage D Switch Node. External induc-

tor connects to this pin.

VIND (Pin 8): Power Stage D Input Supply. Bypass to GND

with a 10µF or larger ceramic capacitor.

FB2 (Pin 9): Buck Regulator 2 Feedback Pin. Receives

feedbackbyaresistordividerconnectedacrosstheoutput.

In configurations where Buck 2 is not used, FB2 should

be tied to ground.

EN2 (Pin 10): Buck Regulator 2 Enable Input. Active high.

In configurations where Buck 2 is not used, tie EN2 to

ground. Do not float.

C1 (Pin 11): Configuration Control Input Bit. With C2 and

C3, C1 configures the Buck output current power stage

combinations. C1 should either be tied to VCC or ground.

Do not float.

C2 (Pin 12): Configuration Control Input Bit. With C1 and

C3, C2 configures the Buck output current power stage

combinations. C2 should either be tied to VCC or ground.

Do not float.

C3 (Pin 13): Configuration Control Input Bit. With C1 and

C2, C3 configures the Buck output current power stage

combinations. C3 should either be tied to VCC or ground.

Do not float.

PGOODALL (Pin 14): PGOOD Status Pin (Active Low).

Open-drain output. When the regulated output voltage

of any enabled switching regulator is below its PGOOD

threshold level, this pin is driven LOW. This level is 98%

of the programmed output value for Buck 1 and 95% of

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