LTC3772 datasheet(10/32 Pages) LINER

Part #	LTC3772

Description	Low Input Voltage, Synchronous Step-Down DC/DC Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3852

10

3852f

PIN FUNCTIONS

C– (Pin 8): Flying Capacitor Negative Terminal.

SHDN (Pin 10): Active Low Shutdown Input. A low on

SHDN disables the charge pump. This pin must not be

allowed to ﬂoat.

GND1 (Pin 11): Charge Pump Ground. The (–) terminals of

CIN and CVPUMP should be closely connected to this pin.

VIN1 (Pin 12): Input Supply Voltage to Charge Pump. VIN1

should be bypassed with a 1μF to 4.7μF low ESR ceramic

capacitor.

VPUMP (Pin 13): Regulated Output Voltage from Charge

Pump. For best performance, VPUMP should be bypassed

with a low ESR ceramic capacitor providing at least 2.2μF

of capacitance as close to the pin as possible.

INTVCC (Pin 14): Gate Drive Supply. The MOSFET drivers

and internal logic are powered from this voltage. Bypass

this pin to GND with a minimum 2.2μF low ESR tantalum

or ceramic capacitor, CINTVCC.

VIN2 (Pin 15): Main Supply Pin for Step-Down Controller.

A bypass capacitor should be tied between this pin and

the GND2 pin.

BOOST (Pin 16): Boosted Floating Driver Supply. The

(+) terminal of the booststrap capacitor is connected to

this pin. This pin swings from a diode voltage drop below

INTVCC up to VIN1 + INTVCC.

TG (Pin 17): Top Gate Driver Output. This is the output

of a ﬂoating driver with a voltage swing equal to INTVCC

superimposed on the switch node voltage.

SW (Pin 18): Switch Node Connection to the Inductor. Vol-

tage swing at this pin is from a diode (external) voltage drop

below ground to the buck regulator power stage VIN.

MODE/PLLIN (Pin 19): Forced Continuous Mode, Burst

Mode operation or Pulse-Skipping Mode Selection Pin

and External Synchronization Input to Phase Detector

Pin. Connect this pin to INTVCC to force continuous

conduction mode of operation. Connect to GND2 to enable

pulse-skipping mode of operation. To select Burst Mode

operation, tie this pin to INTVCC through a resistor no less

than 50k, but no greater than 250k. A clock on the pin

will force the controller into forced continuous mode of

operation and synchronize the internal oscillator.

FREQ/PLLFLTR (Pin 20): The phase-locked loop’s lowpass

ﬁlter is tied to this pin. Alternatively, a resistor can be

connected between this pin and GND2 to vary the frequency

of the internal oscillator.

RUN (Pin 21): Run Control Input. Forcing the pin below

1.25V shuts down the step-down controller. There is a

2μA pull-up current on this pin.

TRACK/SS (Pin 22): Output Voltage Tracking and Soft-Start

Input. A capacitor to ground at this pin sets the ramp rate

for the output voltage. An internal soft-start current of 1μA

charges this capacitor.

ITH (Pin 23): Error Ampliﬁer Output and Switching

Regulator Compensation Point. The current comparator

input threshold increases with this control voltage.

VFB (Pin 24): Error Ampliﬁer Feedback Input. This pin

receives the remotely sensed feedback voltage from an

external resistive divider across the output.

GND (Exposed Pad Pin 25): Ground. Must be soldered to

PCB, providing a local ground for the IC.

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