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LTC3875IUJ#PBF

Description
IC REG CTRLR BUCK 40QFN
Categorysemiconductor    Power management   
File Size760KB,46 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC3875IUJ#PBF Overview

IC REG CTRLR BUCK 40QFN

LTC3875IUJ#PBF Parametric

Parameter NameAttribute value
Output typetransistor driver
Functionstep down
Output configurationjust
Topologystep down
Number of outputs2
output stage2
Voltage - Power Supply (Vcc/Vdd)4.5 V ~ 38 V
Frequency - Switch250kHz ~ 720kHz
Duty cycle (maximum)-
Synchronous rectifieryes
Clock synchronizationnone
serial interface-
Control characteristicsCurrent limit, enable, frequency control, phase control, power good, soft start, tracking
Operating temperature-40°C ~ 125°C (TJ)
Package/casing40-WFQFN Exposed Pad
Supplier device packaging40-QFN(6x6)
FEATURES
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LTC3875
Dual, 2-Phase, Synchronous
Controller with Low Value DCR Sensing
and Temperature Compensation
DESCRIPTION
The
LTC
®
3875
is a dual output current mode synchronous
step-down DC/DC controller that drives all N-channel
synchronous power MOSFET stages. It employs a unique
architecture which enhances the signal-to-noise ratio of
the current sense signal, allowing the use of very low DC
resistance power inductors to maximize the efficiency in
high current applications. This feature also reduces the
switching jitter commonly found in low DCR applications.
The LTC3875 features two high speed remote sense differ-
ential amplifiers, programmable current sense limits from
10mV to 30mV and DCR temperature compensation to limit
the maximum output current precisely over temperature.
A unique thermal balancing function adjusts per phase cur-
rent in order to minimize the thermal stress for multichip
single output applications. The LTC3875 also features a
precise 0.6V reference with guaranteed accuracy of ±0.5%
that provides an accurate output voltage from 0.6V to 3.5V.
A 4.5V to 38V input voltage range allows it to support a
wide variety of bus voltages. The LTC3875 is available
in a low profile 40-lead 6mm
×
6mm (0.5mm pitch) and
40-lead 5mm × 5mm (0.4mm pitch) QFN packages.
L,
LT, LTC, LTM, Linear Technology, the Linear logo OPTI-LOOP, Burst Mode and PolyPhase
are registered trademarks and No R
SENSE
is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.
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Low Value DCR Current Sensing
Programmable DCR Temperature Compensation
±0.5% 0.6V Output Voltage Accuracy
Dual True Remote Sensing Differential Amplifiers
Optional Fast Transient Operation
Phase-Lockable Fixed Frequency 250kHz to 720kHz
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
Dual N-Channel MOSFET Synchronous Drive
Wide V
IN
Range: 4.5V to 38V Operation
Output Voltage Range with Low DCR: 0.6V to 3.5V,
without Low DCR: 0.6V to 5V
Adjustable Soft-Start Current Ramping or Tracking
Foldback Output Current Limiting
Clock Input and Output for Up to 12-Phase Operation
Short-Circuit Soft Recovery
Output Overvoltage Protection
Power Good Output Voltage Monitor
40-Lead QFN Packages
APPLICATIONS
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Servers and Instruments
Telecom Systems
DC Power Distribution Systems
TYPICAL APPLICATION
High Efficiency Dual Phase 1.2V/60A Step-Down Converter
INTV
CC
4.7µF
(OPTIONAL)
THERMAL
SENSOR
0.3µH
(0.32m DCR)
V
IN
INTV
CC
PHASMD
CLKOUT
PGOOD
RUN1,2
IFAST
ILIM
ENTMPB MODE/PLLIN
TG2
TG1
BOOST1
BOOST2
SW1 LTC3875 SW2
EXTV
CC
BG2
BG1
TAVG
PGND
TRSET1
TRSET2
SNSA1
+
SNSA2
+
SNS1
SNS2
SNSD1
+
SNSD2
+
TCOMP1
TCOMP2
V
OSNS1+
FREQ
V
OSNS1
V
OSNS2+
I
TH1
V
0.1µF
122k
V
IN
22µF 6V TO 14V
16V
×4
(OPTIONAL)
THERMAL
SENSOR
0.3µH
(0.32m DCR)
EFFICIENCY (%)
100
95
90
85
6
80
75
20k
1500pF
15k
20k
V
OUT
1.2V
60A
70
4
0.32m
1.5m
2
0.32m PLOSS
1.5m PLOSS
0
20
30
40
50
60
LOAD CURRENT (A)
3875 TA01b
Efficiency and Power Loss
vs Load Current
12V
IN
1.8V
O
~400kHz
CCM
14
12
10
8
POWER LOSS (W)
V
OUT
+
470µF
2.5V
×2
SP
OSNS2
TK/SS1 TK/SS2 I
TH2
0
10
+
470µF
2.5V
×2
SP
3875 TA01a
3875fb
For more information
www.linear.com/LTC3875
1

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Description IC REG CTRLR BUCK 40QFN IC REG CTRLR BUCK 40QFN IC REG CTRLR BUCK 40QFN IC REG CTRLR BUCK 40QFN IC REG CTRLR BUCK 40QFN IC REG CTRLR BUCK 40QFN IC REG CTRLR BUCK 40QFN IC REG CTRLR BUCK 40QFN
Output type transistor driver transistor driver transistor driver transistor driver transistor driver transistor driver transistor driver transistor driver
Function step down step down step down step down step down step down step down step down
Output configuration just just just just just just just just
Topology step down step down step down step down step down step down step down step down
Number of outputs 2 2 2 2 2 2 2 2
output stage 2 2 2 2 2 2 2 2
Voltage - Power Supply (Vcc/Vdd) 4.5 V ~ 38 V 4.5 V ~ 38 V 4.5 V ~ 38 V 4.5 V ~ 38 V 4.5 V ~ 38 V 4.5 V ~ 38 V 4.5 V ~ 38 V 4.5 V ~ 38 V
Frequency - Switch 250kHz ~ 720kHz 250kHz ~ 720kHz 250kHz ~ 720kHz 250kHz ~ 720kHz 250kHz ~ 720kHz 250kHz ~ 720kHz 250kHz ~ 720kHz 250kHz ~ 720kHz
Synchronous rectifier yes yes yes yes yes yes yes yes
Clock synchronization none none none none none none none none
Control characteristics Current limit, enable, frequency control, phase control, power good, soft start, tracking Current limit, enable, frequency control, phase control, power good, soft start, tracking Current limit, enable, frequency control, phase control, power good, soft start, tracking Current limit, enable, frequency control, phase control, power good, soft start, tracking Current limit, enable, frequency control, phase control, power good, soft start, tracking Current limit, enable, frequency control, phase control, power good, soft start, tracking Current limit, enable, frequency control, phase control, power good, soft start, tracking Current limit, enable, frequency control, phase control, power good, soft start, tracking
Operating temperature -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ)
Package/casing 40-WFQFN Exposed Pad 40-WFQFN Exposed Pad 40-WFQFN Exposed Pad 40-WFQFN Exposed Pad 40-WFQFN Exposed Pad 40-WFQFN Exposed Pad 40-WFQFN Exposed Pad 40-WFQFN Exposed Pad
Supplier device packaging 40-QFN(6x6) 40-QFN(5x5) 40-QFN(6x6) 40-QFN(5x5) 40-QFN(5x5) 40-QFN(6x6) 40-QFN(5x5) 40-QFN(6x6)
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