Datasheet Linear Technology LTC3861-1

Manufacturer	Linear Technology
Series	LTC3861-1

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

	LTC3861EUH-1#PBF	LTC3861EUH-1#TRPBF	LTC3861IUH-1#PBF	LTC3861IUH-1#TRPBF
N	1	2	3	4
Package	5x5 QFN-32 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing
Package Code	UH	UH	UH	UH
Package Index	05-08-1693	05-08-1693	05-08-1693	05-08-1693
Pin Count	32	32	32	32

Parametrics

Parameters / Models	LTC3861EUH-1#PBF	LTC3861EUH-1#TRPBF	LTC3861IUH-1#PBF	LTC3861IUH-1#TRPBF
Architecture	Constant Frequency Voltage Mode	Constant Frequency Voltage Mode	Constant Frequency Voltage Mode	Constant Frequency Voltage Mode
Design Tools	LTspice Model,LTpowerCAD Model	LTspice Model,LTpowerCAD Model	LTspice Model,LTpowerCAD Model	LTspice Model,LTpowerCAD Model
Export Control	no	no	no	no
Features	PolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft Start	PolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft Start	PolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft Start	PolyPhase, External Synchronization, Resistor Set Frequency, DCR Current Sense, Power Good, Tracking, Soft Start
Frequency, kHz	2250	2250	2250	2250
Frequency Adjust Range	Up to 2.25MHz	Up to 2.25MHz	Up to 2.25MHz	Up to 2.25MHz
Frequency Sync Range	Up to 2.25MHz	Up to 2.25MHz	Up to 2.25MHz	Up to 2.25MHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	50	50	50	50
Isupply, mA	30	30	30	30
Max Phases	2, 3, 4, 6, 12	2, 3, 4, 6, 12	2, 3, 4, 6, 12	2, 3, 4, 6, 12
Monolithic	no	no	no	no
Number of Outputs	2	2	2	2
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 85	-40 to 85
Output Current, A	40	40	40	40
Output Current 2, A	40	40	40	40
Polyphase	yes	yes	yes	yes
Sense Resistor	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR
Switch Current, A	40	40	40	40
Switch Current 2, A	40	40	40	40
Synchronous	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck
Vin Max, V	24	24	24	24
Vin Min, V	3	3	3	3
Vout Max, V	5.5	5.5	5.5	5.5
Vout Maximum	5.5V	5.5V	5.5V	5.5V
Vout Min, V	0.6	0.6	0.6	0.6
Vref Accuracy Over Temp, %	0.75	0.75	0.75	0.75

Eco Plan

	LTC3861EUH-1#PBF	LTC3861EUH-1#TRPBF	LTC3861IUH-1#PBF	LTC3861IUH-1#TRPBF
RoHS	Compliant	Compliant	Compliant	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