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LTC4449 Datasheet(PDF) 16 Page - Linear Technology

Part # LTC4449
Description  Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management
PDF  108 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4449 Datasheet(HTML) 16 Page - Linear Technology

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LTC3882-1
16
Rev A
For more information www.analog.com
TEST CIRCUIT
TIMING DIAGRAM
OPERATION
SDA
SCL
tHD(STA)
tHD(DAT)
tSU(STA)
tSU(STO)
tSU(DAT)
tLOW
tHD(SDA)
tSP
tBUF
START
CONDITION
STOP
CONDITION
REPEATED START
CONDITION
START
CONDITION
tr
tf
tr
tf
tHIGH
38821 TD
(Channel 0 Example)
1
35
36
40
–
+
DIGITAL
LTC3882-1
COMP0
FB0
VSENSE0+
VR
VSENSE0–
1.024V
1V
12-BIT
D/A
LTC1055
TARGET = VOUT_COMMAND
EA
38821 TC
Overview
The LTC3882-1 is a dual channel/dual phase, constant
frequency analog voltage mode controller for DC/DC step-
down applications. It features a PMBus compliant digital
interface for monitoring and control of important power
system parameters. The chip operates from an IC power
supplybetween3Vand13.2Vandisintendedforconversion
from VIN between 3V and 38V to output voltages between
0.5V and 5.25V. It is designed to be used in a switching
architecture with external FET drivers, including higher
level integrations such as non-isolated power blocks.
Major features include:
• Digitally Programmable Output Voltage
• Digitally Programmable Output Current Limit
• Digitally Programmable Input Voltage Supervisor
• Digitally Programmable Output Voltage Supervisors
• Digitally Programmable Switching Frequency
• Digitally Programmable On and Off Delay Times
• Digitally Programmable Soft-Start/Stop



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