LTC3836_15 Datasheet, PDF (7/30 Pages) Linear Technology – Dual 2-Phase, No RSENSETM Low VIN Synchronous Controller

LTC3836
PIN FUNCTIONS (GN/UFD Package)
BOOST1/BOOST2 (Pins 27, 16)/(Pins 24, 13): Positive
Supply Pin for the Gate Driver Circuitry. A bootstrapped
capacitor, charged with an external Schottky diode and a
boost voltage source, is connected between the BOOST
and SW pins. Voltage swing at the BOOST pins is from
boost source voltage (typically V_IN) to this boost source
voltage + V_IN.
SENSE1⁺/SENSE2⁺ (Pins 28, 5)/(Pins 25, 12): Positive
Input to Differential Current Comparator. Also powers the
gate drivers. Normally connected to the drain of the main
external MOSFET.
Exposed Pad (Pin 29) UFD Package Only: Must be sol-
dered to PCB ground.
FUNCTIONAL DIAGRAM (Common Circuitry)
R_VIN
V_IN
(TO CONTROLLER 1, 2)
V_IN
C_VIN
UNDERVOLTAGE
LOCKOUT
VOLTAGE
REFERENCE
0.6V
V_REF
0.65μA
RUN/SS
SHDN
EXTSS
t_SEC = 1ms
+
–
INTSS
SYNC/FCB
SYNC DETECT
PHASE
DETECTOR
PLLLPF
VOLTAGE
CONTROLLED
OSCILLATOR
CLK1
CLK2
SLOPE
COMP
–
FCB
+
0.6V
–
V_FB1
FCB
+
0.54V
+
V_FB2
–
SLOPE1
SLOPE2
UV1
OV1
SHDN
UV2
OV2
PGOOD
37362 FD
3836fb
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