LTC3636IUFD-1-PBF 查看數據表（PDF） - Linear Technology

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LTC3636IUFD-1-PBF

Dual Channel 6A, 20V Monolithic Synchronous Step-Down Regulator

Linear Technology 

LTC3636/LTC3636-1

Pin Functions

VIN2 (Pins 15, 16): Power Supply Input for Channel 2.

This input is capable of operating from a separate supply

voltage than VIN1.

SW1 (Pins 20, 24): Channel 1 Switch Node Connection

to External Inductor. Voltage swing of SW is from a diode

voltage drop below ground to VIN.

VIN1 (Pins 21, 22): Power Supply Input for Channel 1.

Input voltage to the on chip power MOSFETs on channel 1.

The internal LDO for INTVCC is powered off of this pin.

BOOST1 (Pin 23): Boosted Floating Driver Supply for

Channel 1. The (+) terminal of the bootstrap capacitor

connects to this pin while the (–) terminal connects to

the SW pin. The normal operational voltage swing of this

pin ranges from a diode voltage drop below INTVCC up

to VIN + INTVCC.

TRACKSS1 (Pin 26): Output Tracking and Soft-Start Input

Pin for Channel 1. Forcing a voltage below 0.6V on this pin

bypasses the internal reference input to the error amplifier.

The LTC3636/LTC3636-1 will servo the FB pin to the TRACK

voltage. Above 0.6V, the tracking function stops and the

internal reference resumes control of the error amplifier.

An internal 1.4μA pull up current from INTVCC allows a

soft-start function to be implemented by connecting a

capacitor between this pin and PGND.

PGOOD1 (Pin 27): Channel 1 Open-Drain Power Good

Output Pin. PGOOD1 is pulled to ground when the voltage

on the VFB1 pin is not within ±8% (typical) of the internal

0.6V reference. PGOOD1 becomes high impedance once

the VFB1 pin returns to within ±5% (typical) of the internal

reference.

VFB1 (Pin 28): Channel 1 Output Feedback Voltage Pin.

Input to the error amplifier that compares the feedback

voltage to the internal 0.6V reference voltage. Connect this

pin to a resistor divider network to program the desired

output voltage.

INTVCCT (Pin 29): Additional INTVCC pin. Not required to

be connected to INTVCC pin for operation.

GNDT (Pins 30, 31, 32): Power Ground. Additional power

ground pins for improved thermal dissipation when con-

nected to the GND pins. Not required to be connected to

GND pins for operation.

SWT1T ( Pin 33): Additional SW1 pin. Not required to be

connected to SW1 pins 20 and 24 for operation.

SWT2T (Pins 34): Additional SW2 pin. Not required to be

connected to SW2 pins 13 and 17 for operation.

For more information www.linear.com/LTC3636

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