Datasheet LTC3417A-2 (Analog Devices) - 7

LTC3417A-2
PIN FUNCTIONS (DFN/ TSSOP)
VIN, the 1.5A regulator and the 1A regulator are in phase.
PGND1 ( Pi n 16/ Pi n 19) :
Ground for SW1 N-Channel Driver. When PHASE is at 0V, the 1.5A regulator and the 1A
PGND2, GNDD ( Pi ns 1, 10, 11, 20) :
TSSOP Package Only. regulator are switching 180 degrees out-of-phase. Do Ground for SW2 N-channel driver and digital ground for not fl oat this pin. circuit.
SW1 ( Pi n 15/ Pi n 18) :
Switch Node Connection to the
Exposed Pad ( Pi n 17/ Pi n 21) :
PGND2, GNDD. Ground for Inductor for the 1.5A Regulator. This pin swings from SW2 N-channel driver and digital ground for circuit. The VIN1 to PGND1. Exposed Pad must be soldered to PCB ground.
FUNCTIONAL DIAGRAM 1.5A REGULATOR
ITH1 VIN1 ITH + LIMIT – + VFB1 – + – VB SLOPE COMPENSATION 0.752V + ANTI-SHOOT- SW1 – THROUGH + + LOGIC – 0.848V – – PGND1 + RUN1 PGOOD VOLTAGE V REFERENCE IN2 RUN2 PHASE SYNC/MODE OSCILLATOR FREQ + PGND2 – – 0.848V – LOGIC + + – SW2 ANTI-SHOOT- THROUGH + 0.752V SLOPE COMPENSATION – + VFB2 – VB + – + ITH LIMIT
1A REGULATOR
ITH2 VIN2 3417A-2 BD 3417a2fa 7