LTC3882-1
1
Rev A
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Dual Output PolyPhase
Step-Down DC/DC Voltage Mode Controller
with Digital Power System Management
is a dual, PolyPhase DC/DC synchronous
step-down switching regulator controller with
. It uses a constant frequency,
leading-edge modulation, voltage mode architecture for
excellent transient response and output regulation. Each
PWM channel can produce output voltages from 0.5V to
5.25V using a wide range of 3.3V compatible power stages,
including power blocks, DrMOS or discrete FET drivers.
Up to four LTC3882-1 devices can operate in parallel for
2-, 3-, 4-, 6- or 8-phase operation.
System configuration and monitoring is supported by the
software tool. The LTC3882-1 serial interface
can read back input voltage, output voltage and current,
temperature and fault status. Most operating parameters can
be set via the digital interface or stored in internal EEPROM
for use at power up. Switching frequency and phase, output
voltage and device address can also be set using external
configuration resistors.
n
PMBus/I
2
C Compliant Serial Interface
– Monitor Voltage, Current, Temperature and Faults
– Program Voltage, Soft-Start/Stop, Sequencing,
Margining, AVP and UV/OV/OC Limits
n
3V ≤ VINSNS ≤ 38V, 0.5V ≤ V
OUT
≤ 5.25V
n
±0.5% Output Voltage Error
n
Programmable PWM Frequency or External Clock
Synchronization from 250kHz to 1.25MHz
n
Accurate PolyPhase
®
Current Sharing
n
Internal EEPROM with Fault Logging and ECC
n
IC Supply Range: 3V to 13.2V
n
Resistor or Inductor DCR Current Sensing
n
Power Good Output Voltage Monitor
n
Optional Resistor Programming for Key Parameters
n
40-Pin (6mm
×
6mm) QFN Package
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 5396245, 5859606, 6144194, 6937178, 7420359 and 7000125.
APPLICATIONS
n
High Current Distributed Power Systems
n
Servers, Network and Storage Equipment
n
Intelligent Energy Efficient Power Regulation
LTC3882-1
SDA
RUN1
I
SENSE0
+
I
SENSE0
–
V
SENSE0
+
V
SENSE0
–
V
SENSE1
–
RUN0
FAULT1
FAULT0
FB0
COMP0
TSNS0
TSNS1
GND
38821 TA01a
I
AVG_GND
PWM0
V
SENSE1
+
I
SENSE1
–
I
SENSE1
+
PWM1
V
IN
7V TO 13.2V
TO/FROM
MCU
SCL
ALERT
COMP1
V
CC
VINSNS
FDMF5820DC
FDMF5820DC
INDUCTORS: COOPER FP1007R1-R22
SOME DETAILS OMITTED FOR CLARITY
PWM
V
IN
V
OUT
1V
70A
SW
GND
I
AVG1
I
AVG0
TO/FROM
EXTERNAL DEVICES
PGOOD1
SYNC
SHARE_CLK
PGOOD0
PWM
V
IN
SW
GND
Load Step Transient Current Sharing
(Using FDMF5820DC DrMOS)
PWM ENABLE
OUTPUT
TG/BG
CONTROL
HW WRITE
PROTECT
DEDICATED
PGOOD OUTPUT
DIFFERENTIAL
V
OUT
SENSE
LTC3882
•
•
•
V
OUT0
Only
LTC3882-1
•
V
OUT0
&
V
OUT1
50µs/DIV
I
OUT
10A/DIV
I
L0
,
I
L1
10A/DIV
38821 TA01b
