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LTC3887IUJ-1

Description
降压 稳压器 正 输出 降压 I²C,PMBus DC DC 切换控制器 IC 40-QFN(6x6)
Categorysemiconductor    Multi-channel IC (PMIC)   
File Size3MB,116 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric View All

LTC3887IUJ-1 Overview

降压 稳压器 正 输出 降压 I²C,PMBus DC DC 切换控制器 IC 40-QFN(6x6)

LTC3887IUJ-1 Parametric

Parameter NameAttribute value
category
MakerADI
seriesPolyPhase®
PackagePipe fittings
Output typetransistor driver
Functionstep down
Output configurationjust
Topologystep down
Number of outputs2
output stage2
Voltage - Power supply (Vcc/Vdd)4.5V ~ 24V
Frequency - Switch250kHz ~ 1MHz
Duty cycle (maximum)-
Synchronous rectifieryes
Clock synchronizationyes
serial interfaceI²C,PMBus
Control characteristics使能,频率控制,相位控制
Operating temperature-40°C ~ 125°C(TJ)
Installation typesurface mount type
Package/casing40-WFQFN Exposed Pad
Supplier device packaging40-QFN(6x6)
Basic product numberLTC3887-1
LTC3887/LTC3887-1/
LTC3887-2
Dual Output PolyPhase Step-Down DC/DC Controller
with Digital Power System Management
FEATURES
DESCRIPTION
n
n
n
n
n
n
n
n
n
n
n
n
n
PMBus/I
2
C Compliant Serial Interface
n
Telemetry Read Back includes V , I , V
IN IN OUT
, I
OUT
,
Temperature, Duty Cycle and Faults
n
Programmable Voltage, Current Limit, Digital
Soft-Start/Stop, Sequencing, Margining, OV/UV
and Frequency Synchronization (250kHz to 1MHz)
±0.5% Output Voltage Accuracy Over Temperature
Integrated 16-Bit ADC
V
OUT
Range: 0.5V to 5.5V (V
OUT0
, V
OUT1
)
Internal EEPROM and Fault Logging with ECC
Integrated N-Channel MOSFET Gate Drivers (LTC3887)
Minimum On-Time 45ns
Wide V
IN
Range: 4.5V to 24V
Analog Current Mode Control Loop
Remote Differential Sense for PolyPhase
®
Applications
Accurate PolyPhase Current Sharing for Up to Six Phases
Available in a 40-Pin (6mm
×
6mm) QFN Package
AEC-Q100 Qualified for Automotive Applications
High Current Distributed Power Systems
Telecom, Datacom and Storage Systems
Intelligent Energy Efficient Power Regulation
The
LTC
®
3887/LTC3887-1/LTC3887-2
are dual,
PolyPhase DC/DC synchronous step-down switching
regulator controllers with an I
2
C-based
PMBus compli-
ant serial interface.
The controllers use a constant fre-
quency, current mode architecture that is supported by
LTpowerPlay
®
a software development tool with graphical
user interface (GUI).
Switching frequency, channel phasing, output voltage,
and device address can be programmed using external
configuration resistors. Additionally, parameters can be
set via the digital interface or stored in EEPROM. Voltage,
current, internal/external temperature and fault status can
be read back through the bus interface.
The LTC3887 has integrated gate drivers. The LTC3887-1
has three-state PWM pins to drive DrMOS power stages.
The LTC3887-2 has gate drivers and no LDO and supports
V
IN
up to 34V. The LTC3887 is an enhanced version of
the LTC3880 with greater output voltage range and more
digital features. Refer to Operation section for more detail.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 5408150,
7420359. Licensed under U.S. Patent 7000125 and other related patents worldwide.
APPLICATIONS
n
n
n
TYPICAL APPLICATION
Dual 350kHz 3.3V/0.5V Step-Down Converter
V
IN
6V TO 16V
10µF
V
IN
0.1µF
V
OUT0
0.5V
20A
0.56µH
1.58k
0.22µF
TG0
INTV
CC
TG1
0.1µF
1µH
2k
0.22µF
V
OUT1
3.3V
20A
1µF
0.5
0.4
0.3
V
OUT
ERROR (%)
0.2
0.1
0
–0.1
–0.2
–0.3
Regulated Output Voltage vs
Temperature, V
OUT
= 0.5V
LTC3887
BOOST0
SW0
BG0
I
SENSEO+
I
SENSEO–
V
SENSEO+
V
SENSEO–
TSNS0
10nF
2200pF
4.99k
BOOST1
SW1
BG1
I
SENSE1+
I
SENSE1–
V
SENSE1
TSNS1
2200pF
10nF
6.04k
530µF
+
+
530µF
–0.4
–0.5
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90
110
I
THO
SDA
SCL
ALERT
RUN0
RUN1
I
TH1
GPIO0
GPIO1
V
DD33
V
DD25
*SOME DETAILS OMITTED
FOR CLARITY
PMBus
INTERFACE
FAULT MANAGEMENT
3887 TA01b
TO/FROM
OTHER LTC DEVICES
WRITE PROTECT
SHARE_CLK
SYNC
GND
WP
1µF
1µF
3887 TA01a
Document Feedback
For more information
www.analog.com
1
Rev. F

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