LTC3736-2 Datasheet, PDF(7/28 Page) Linear Technology – Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking

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LTC3736-2 Datasheet, PDF (7/28 Pages) Linear Technology – Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking

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LTC3736-2

PI FU CTIO S

resistor divider from the auxiliary output. To synchronize

with an external clock using the PLL, apply a CMOS

compatible clock with a frequency between 250kHz and

850kHz. To select pulse-skipping operation at light loads,

tie this pin to VIN. Grounding this pin selects forced

continuous operation, which allows the inductor current to

reverse. When synchronized to an external clock, pulse-

skipping operation is enabled at light loads.

BG1/BG2 (Pins 19, 13/Pins 22, 16): Bottom (NMOS) Gate

Drive Output. These pins drive the gates of the external N-

channel MOSFETs. These pins have an output swing from

PGND to SENSE+.

SENSE1+/SENSE2+ (Pins 21, 11/Pins 24, 14): Positive

Input to Differential Current Comparator. Also powers the

gate drivers. Normally connected to the source of the ex-

ternal P-channel MOSFET.

SW1/SW2 (Pins 22, 10/Pins 1, 13): Switch Node Connec-

tion to Inductor. Also the negative input to differential peak

current comparator and an input to the reverse current com-

parator. Normally connected to the drain of the external P-

channel MOSFETs, the drain of the external N-channel

MOSFET, and the inductor.

IPRG1/IPRG2 (Pins 23, 2/Pins 2, 5): Three-State Pins to

Select Maximum Peak Sense Voltage Threshold. These pins

select the maximum allowed voltage drop between the

SENSE+ and SW pins (i.e., the maximum allowed drop

across the external P-channel MOSFET) for each channel.

Tie to VIN, GND or float to select 345mV, 167mV, or 240mV

respectively.

VFB1/VFB2 (Pins 24, 7/Pins 3, 10): Feedback Pins. Receives

the remotely sensed feedback voltage for its controller from

an external resistor divider across the output.

FU CTIO AL DIAGRA (Common Circuitry)

RVIN

VIN

(TO CONTROLLER 1, 2)

VIN

CVIN

UNDERVOLTAGE

LOCKOUT

VOLTAGE

REFERENCE

0.6V

VREF

0.7ÂµA

RUN/SS

SHDN

EXTSS

tSEC = 1ms

INTSS

SYNC/FCB

SYNC DETECT

PHASE

DETECTOR

PLLLPF

VOLTAGE

CONTROLLED

OSCILLATOR

CLK1

CLK2

SLOPE

COMP

FCB

0.6V

VFB1

FCB

0.54V

VFB2

SLOPE1

SLOPE2

UV1

OV1

SHDN

UV2

OV2

PGOOD

37362 FD

37362fa

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