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LTM8027IV Datasheet(PDF) 10 Page - Linear Technology

Part # LTM8027IV
Description  60V, 4A DC/DC Module Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTM8027IV Datasheet(HTML) 10 Page - Linear Technology

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LTM8027
10
8027f
BLOCK DIAGRAM
OPERATION
The LTM8027 is a standalone nonisolated step-down
switching DC/DC power supply with an input voltage
range of 4.5V to 60V that can deliver up to 4A of output
current. This module provides a precisely regulated output
voltage up to 24V, programmable via one external resistor.
Given that the LTM8027 is a step-down converter, make
sure that the input voltage is high enough to support the
desired output voltage and load current. A simplified block
diagram is given above. The LTM8027 contains a current
mode controller, power switching element, power induc-
tor, power MOSFETs and a modest amount of input and
output capacitance.
The LTM8027 is a fixed frequency PWM regulator. The
switching frequency is set by simply connecting the ap-
propriate resistor from the RT pin to GND.
A linear regulator provides internal power (shown as
INTVCC on the Block Diagram) to the control circuitry. The
bias regulator normally draws power from the VIN pin, but
if the BIAS1and BIAS2 pins are connected to an external
voltage higher than 8.5V, bias power will be drawn from
the external source (typically the regulated output voltage).
This improves efficiency. The RUN pin is used to enable
or place the LTM8027 in shutdown, disconnecting the
output and reducing the input current to less than 10μA.
8027 BD
VIN
VIN
INTVCC
6.8μH
RUN
2.2μF
CURRENT
MODE
CONTROLLER
INTERNAL
CONNECTION
TO VOUT
SS
SYNC
AUX
BIAS1
BIAS2
GND
RT
ADJ
VOUT
INTERNAL
LINEAR
REGULATOR
4.7pF
499k


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