Datasheet Linear Technology LTC3811

Manufacturer	Linear Technology
Series	LTC3811

High Speed Dual, Multiphase Step-Down DC/DC Controller

Datasheets

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PDF, 552 Kb, Language: en, File uploaded: Sep 23, 2017, Pages: 48
High Speed Dual, Multiphase Step-Down DC/DC Controller

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Packaging

	LTC3811EG#PBF	LTC3811EG#TRPBF	LTC3811EUHF#PBF	LTC3811EUHF#TRPBF
N	1	2	3	4
Package	SSOP-36 Package Outline Drawing	SSOP-36 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing
Package Code	G	G	UHF	UHF
Package Index	05-08-1640 (G36)	05-08-1640 (G36)	05-08-1701	05-08-1701
Pin Count	36	36	38	38

Parametrics

Parameters / Models	LTC3811EG#PBF	LTC3811EG#TRPBF	LTC3811EUHF#PBF	LTC3811EUHF#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC971A	DC971A	DC971A	DC971A
Design Tools	LTspice Model	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no	no
Features	PolyPhase, Differential Remote Sense, DCR Current Sense, Power Good, Tracking, Sequencing, Selectable Switching Frequency, External Synchronization, PLL	PolyPhase, Differential Remote Sense, DCR Current Sense, Power Good, Tracking, Sequencing, Selectable Switching Frequency, External Synchronization, PLL	PolyPhase, Differential Remote Sense, DCR Current Sense, Power Good, Tracking, Sequencing, Selectable Switching Frequency, External Synchronization, PLL	PolyPhase, Differential Remote Sense, DCR Current Sense, Power Good, Tracking, Sequencing, Selectable Switching Frequency, External Synchronization, PLL
Frequency, kHz	500	500	500	500
Frequency Adjust Range	250kHz to 750kHz	250kHz to 750kHz	250kHz to 750kHz	250kHz to 750kHz
Frequency Sync Range	150kHz to 900kHz	150kHz to 900kHz	150kHz to 900kHz	150kHz to 900kHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	20	20	20	20
Isupply, mA	10.5	10.5	10.5	10.5
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	0 to 85	0 to 85
Output Current, A	20	20	20	20
Output Current 2, A	20	20	20	20
Polyphase	yes	yes	yes	yes
Sense Resistor	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR
Switch Current, A	20	20	20	20
Switch Current 2, A	20	20	20	20
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	30	30	30	30
Vin Min, V	4.5	4.5	4.5	4.5
Vout Max, V	3.3	3.3	3.3	3.3
Vout Maximum	3.3V	3.3V	3.3V	3.3V
Vout Min, V	0.6	0.6	0.6	0.6
Vout Min 2, V	0.8	0.8	0.8	0.8
Vref Accuracy Over Temp, %	0.5	0.5	0.5	0.5

Eco Plan

	LTC3811EG#PBF	LTC3811EG#TRPBF	LTC3811EUHF#PBF	LTC3811EUHF#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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Multiphase DC/DC Controller Pushes Accuracy and Bandwidth Limits &mdash DN434
PDF, 106 Kb, File published: Jan 15, 2008
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advertisement Multiphase DC/DC Controller Pushes Accuracy and Bandwidth
Limits
Design Note 434
Tick Houk
In addition to high accuracy, the LTC3811вЂ™s low minimum on-time (typically 65ns) allows users to convert a
12V input to a 1V output at switching frequencies up to
750kHz, optimizing load transient response and reducing
the solution size. Introduction
Speed and accuracy donвЂ™t always go hand-in-hand
in DC/DC converter systemsвЂ”that is, until now. The
LTC3811 is a dual output, п¬Ѓxed frequency current mode
DC/DC switching regulator controller designed for one of
todayвЂ™s most demanding power supply applications: high
current, low voltage processor core supplies. A Dual Output, 2-Phase Supply with Differential
Remote Sensing and Inductor DCR Sensing
Figure 1 illustrates a dual output supply using the LTC3811.
The 1.5V, 15A output is regulated using the integrated
differential remote sense ampliп¬Ѓer and tracks the output of
channel 1 during start-up. Both outputs use DCR sensing
in order to maximize efп¬Ѓciency and operate 180В° out of With supply current requirements in excess of 100A
and supply voltages as low as 1V, every milliohm of
PCB resistance and every millivolt of IR drop count. The
LTC3811 has an output voltage tolerance of В±0.5% over …

Model Line

Series: LTC3811 (4)

LTC3811EG#PBF LTC3811EG#TRPBF LTC3811EUHF#PBF LTC3811EUHF#TRPBF

Manufacturer's Classification

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