LTC3738 Linear Technology, LTC3738 Datasheet - Page 9

• Manufacturer Part Number: LTC3738
• Description: 3-Phase Buck Controller
• Manufacturer: Linear Technology

www.DataSheet4U.com
PI FU CTIO S
SW1, SW2, SW3 (Pins 30, 27, 21): Switch Node Connec-
tions to Inductors. Voltage swing at these pins is from a
Schottky diode (external) voltage drop below ground to
V
TG1, TG2, TG3 (Pins 31, 28, 20): High Current Gate Drives
for Top N-Channel MOSFETs. These are the outputs of the
floating drivers with a voltage swing equal to the boost
voltage source superimposed on the switch node voltage
SW.
BOOST1, BOOST2, BOOST3 (Pins 32, 29, 19): Positive
Supply Pins to the Topside Floating Drivers. Bootstrapped
capacitors, charged with external Schottky diodes and a
boost voltage source are connected between the BOOST and
SW pins. Voltage swing at the BOOST pins is from the boost
source voltage (typically V
+V
IN
IN
U
(where V
(where V
U
IN
IN
is the external MOSFET supply rail).
is the external MOSFET supply rail).
U
CC
) to this boost source voltage
PGOOD (Pin 33): This open-drain output is pulled low
when the output voltage is outside the PGOOD tolerance
window. PGOOD is blanked during VID transitions for
approximately 100µs.
VID0, VID1, VID2, VID3, VID4, VID5 (Pins 35, 36, 37, 17,
18, 34): Output Voltage Programming Input Pins. When
VID5 is tied to V
When voltage of VID5 is less than V
as the fifth VID bit of VRM10.
OUTEN (Pin 38): On/Off Control of the Controller.
SGND (Pin 39, Exposed Pad): Signal Ground. This pin
must be soldered to the ground plane.
CC
, the Intel VRM9 VID table is selected.
CC
– 2V, VID5 serves
LTC3738
9
3738f