LTC3882_15 Datasheet, PDF (14/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
TEST CIRCUIT (Channel 0 Example)
DIGITAL
1.024V
12-BIT
D/A
V_R
+
EA
–
LTC3882
V_SENSE0–
V_SENSE0+
FB0
35
36 40
COMP0
1
TARGET = VOUT_COMMAND
LTC1055
1V
TIMING DIAGRAM
SDA
t_f
t_LOW
SCL
t_HD(STA)
START
CONDITION
t_r
t_SU(DAT)
t_f
t_HD(DAT)
t_HIGH
t_HD(SDA)
t_SU(STA)
REPEATED START
CONDITION
t_SP
t_r
t_BUF
t_SU(STO)
STOP
CONDITION
3882 TD
START
CONDITION
OPERATION
Overview
The LTC3882 is a dual channel/dual phase, constant fre-
quency 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
supply between 3V and 13.2V and is intended for conversion
from V_IN 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
3882f
14
For more information www.linear.com/LTC3882