Datasheet Linear Technology LTC3861IUH-1#PBF

Manufacturer	Linear Technology
Series	LTC3861-1
Part Number	LTC3861IUH-1#PBF

Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

Datasheets

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PDF, 1.3 Mb, Language: en, File uploaded: Sep 24, 2017, Pages: 38
Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

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Packaging

Package	5x5 QFN-32
Package Code	UH
Package Index	05-08-1693

Parametrics

Architecture	Constant Frequency Voltage Mode
Design Tools	LTspice Model,LTpowerCAD Model
Export Control	no
Features	PolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft Start
Frequency	2250 kHz
Frequency Adjust Range	Up to 2.25MHz
Frequency Sync Range	Up to 2.25MHz
Integrated Inductor	no
Ishutdown	50 µA
Isupply	30 mA
Max Phases	2, 3, 4, 6, 12
Monolithic	no
Number of Outputs	2
Operating Temperature Range	-40 to 85 °C
Output Current	40 A
Output Current 2	40 A
Polyphase	yes
Sense Resistor	Rsense, DCR
Switch Current	40 A
Switch Current 2	40 A
Synchronous	yes
Topology	Buck
Topology 1	Buck
Topology 2	Buck
Vin Max	24 V
Vin Min	3 V
Vout Max	5.5 V
Vout Maximum	5.5V
Vout Min	0.6 V
Vref Accuracy Over Temp	0.75 %

Eco Plan

RoHS

Compliant

Application Notes

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Modeling and Loop Compensation Design of Switching Mode Power Supplies &mdash AN149
PDF, 1.4 Mb, File published: Mar 23, 2015
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Application Note 149
January 2015
Modeling and Loop Compensation Design of
Switching Mode Power Supplies
Henry J. Zhang
Introduction Identifying The Problem TodayвЂ™s electronic systems are becoming more and more
complex, with an increasing number of power rails and
supplies. To achieve optimum power solution density,
reliability and cost, often system designers need to design
their own power solutions, instead of just using commercial power supply bricks. Designing and optimizing high
performance switching mode power supplies is becoming
a more frequent and challenging task. A well-designed switching mode power supply (SMPS)
must be quiet, both electrically and acoustically. An undercompensated system may result in unstable operations.
Typical symptoms of an unstable power supply include:
audible noise from the magnetic components or ceramic
capacitors, jittering in the switching waveforms, oscillation
of output voltage, overheating of power FETs and so on. Power supply loop compensation design is usually
viewed as a difficult task, especially for inexperienced
supply designers. Practical compensation design typically
involves numerous iterations on the value adjustment
of the compensation components. This is not only time
consuming, but is also inaccurate in a complicated
system whose supply bandwidth and stability margin …

Model Line

Series: LTC3861-1 (4)

LTC3861EUH-1#PBF LTC3861EUH-1#TRPBF LTC3861IUH-1#PBF LTC3861IUH-1#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | External Power Switch Buck Controllers

Other Names:

LTC3861IUH-1PBF, LTC3861IUH-1 PBF, LTC3861IUH1#PBF, LTC3861IUH 1#PBF