LTM4656 datasheet(7/26 Pages) AD

7 / 26 page

LTM4712

Rev. 0

For more information www.analog.com

INTVCC (Pin B3): Internal 5V Regulator Output of the

Switching Mode Regulator Channel. The internal control

circuits are powered from this voltage. The LTM4712

has an internal 2.2μF decoupling capacitor connecting

to SGND.

EXTVCC (Pin B4): External Power Input to an Internal LDO

powering the gate driver. When the voltage on this pin is

greater than 8V and lower than the VIN pin voltage, this

LDO bypasses the internal LDO powered from VIN. The

LTM4712 has an internal 0.1μF decoupling capacitor.

ISET (Pin B5): Average Current Regulation Pin. A resis-

tor from this pin to SGND sets the maximum average

input or output current sensed by the ISP and ISN pins.

This pin sources 15μA current. See the Applications

Information section.

SYNC (Pin B6): External Synchronization Input. The

SYNC pin has an internal pull-down resistor. See the

Operating Frequency Selection and Phase-Locked Loop

(FREQ, SYNC, PHMODE and CLKOUT Pins) section in

Applications Information for details. Tie this pin to GND

when not used.

RUN (Pin B8): Enable Control Input. A voltage above

1.22V turns on the IC. There is a 2μA pull-up current on

this pin. Once the RUN pin rises above the 1.22V thresh-

old, the pull-up increases to 6μA.

FB (Pin B9): The Negative Input of the Error Amplifier

for the Switching Mode Regulator. This pin is internally

connected to VOUT with a 100k precision resistor. Output

voltages can be programmed with an additional resistor

between FB and SGND pins.

PIN FUNCTIONS

COMPa (Pin B10): Current control threshold and error

amplifier compensation point of the switching mode reg-

ulator channel. The internal current comparator threshold

is linearly proportional to this voltage. Tie the COMPa pins

from different channels together for parallel operation.

The device is internally compensated. Connect to COMPb

to use the internal compensation. Or connect to a Type-II

C-R-C network to use customized compensation.

COMPb (Pin B11): Internal Loop Compensation Network.

Connect to COMPa to use the internal compensation in

majority of applications.

SGND (Pins C6-D6, B7-D8): Signal Ground Pin. Tie to

GND with minimum distance. Connect all small signal

components e.g., INTVCC, SS, FB, Comp, FREQ, etc. to

SGND.

VIN (Pins H1-M1, H2-M2): Power Input Pins. Apply input

filter capacitors between these pins and GND pins. See

the Applications Information section.

VOUT (Pins H11-M11, H12-M12): Power Output Pins.

Apply output filter capacitors between these pins and GND

pins. See the Applications Information section.

SW1, SW2 (Pins K5-L5, K8-L8): Switching Nodes of

Buck Side or Boost Side that is Used for Testing Purposes.

An R-C snubber network can be applied to reduce switch

node ringing, or otherwise leave floating.

LTM4656 датащи(PDF) 7 Page - Analog Devices

LTM4656 датащи(HTML) 7 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

датащи скачать

ссылки URL