LTC3428

4

3428f

PI FU CTIO S

PGNDA, PGNDB (Pins 1, 10, 11 (Exposed Pad)): Power

Ground for the IC. Tie directly to local ground plane.

SWB (Pin 2), SWA (Pin 9): Phase B and Phase A Switch

Pins. The inductor and Schottky diodes for each phase are

connected to these pins. Minimize trace length to reduce

EMI.

Power Source for the IC. Connect low ESR output filter

capacitors from this pin to the ground plane.

SHDN (Pin 4): Shutdown Pin. Grounding this pin shuts

down the IC. Connect to a voltage greater than 1.5V to

enable.

TYPICAL PERFOR A CE CHARACTERISTICS

3.4

3.2

3.0

2.8

2.6

2.4

2.2

2.0

3428 G10

TEMPERATURE (°C)

–45

15

55

–25

–5

35

75

95

Peak Current Limit vs

Temperature

network is connected to this pin to compensate the boost

converter loop.

connected here to set the output voltage according to

AGND (Pin 7): Signal Ground for the IC. Connect to ground

plane near feedback resistor divider.

ceramic capacitor of at least 4.7µF. X5R and X7R dielec-

trics are preferred for their superior voltage and tempera-

ture characteristics.