LTC3826 Linear Technology, LTC3826 Datasheet - Page 9

• Manufacturer Part Number: LTC3826
• Description: 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology

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PIN FUNCTIONS
PGOOD2 (Pin 28): Open-Drain Logic Output. PGOOD2
is pulled to ground when the voltage on V
within ±10% of its set point.
TRACK/SS1, TRACK/SS2 (Pins 29, 13): External Track-
ing and Soft-Start Input. The LTC3826 regulates the
V
TRACK/SS1,2 pin. An internal 1μA pull-up current source
is connected to this pin. A capacitor to ground at this
pin sets the ramp time to fi nal regulated output voltage.
Alternatively, a resistor divider on another voltage supply
connected to this pin allows the LTC3826 output to track
the other supply during startup.
I
Switching Regulator Compensation Points. Each associ-
ated channel’s current comparator trip point increases
with this control voltage.
TH1
FB1,2
, I
voltage to the smaller of 0.8V or the voltage on the
TH2
(Pins 30, 12): Error Amplifi er Outputs and
FB2
pin is not
V
feedback voltage for each controller from an external
resistive divider across the output.
SENSE1
Differential Current Comparators. The I
controlled offsets between the SENSE
conjunction with R
Exposed Pad (Pin 33): SGND. Must be soldered to the
PCB.
FB1
, V
FB2
+
, SENSE2
(Pins 31, 11): Receives the remotely sensed
SENSE
+
(Pins 32, 10): The (+) Input to the
set the current trip threshold.
–
and SENSE
TH
LTC3826
pin voltage and
+
pins in
3826fc
9