Datasheet Linear Technology LTC3774

Manufacturer	Linear Technology
Series	LTC3774

Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing

Datasheets

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PDF, 426 Kb, Language: en, File uploaded: Sep 23, 2017, Pages: 38
Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing

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Packaging

	LTC3774EUHE#PBF	LTC3774EUHE#TRPBF	LTC3774IUHE#PBF	LTC3774IUHE#TRPBF
N	1	2	3	4
Package	5x6 QFN-36 Package Outline Drawing	5x6 QFN-36 Package Outline Drawing	5x6 QFN-36 Package Outline Drawing	5x6 QFN-36 Package Outline Drawing
Package Code	UHE	UHE	UHE	UHE
Package Index	05-08-1876	05-08-1876	05-08-1876	05-08-1876
Pin Count	36	36	36	36

Parametrics

Parameters / Models	LTC3774EUHE#PBF	LTC3774EUHE#TRPBF	LTC3774IUHE#PBF	LTC3774IUHE#TRPBF
Architecture	Advanced Constant Frequency Current Mode	Advanced Constant Frequency Current Mode	Advanced Constant Frequency Current Mode	Advanced Constant Frequency Current Mode
Demo Boards	DC2002A,DC2111A-A,DC2111A-B	DC2002A,DC2111A-A,DC2111A-B	DC2002A,DC2111A-A,DC2111A-B	DC2002A,DC2111A-A,DC2111A-B
Design Tools	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File
Export Control	no	no	no	no
Features	Sub-Milliohm DCR Current Sense, Phase Shedding, Differential Remote Sense, External Synchronization, Resistor Set Frequency, Tracking, Power Good, No FET Drivers	Sub-Milliohm DCR Current Sense, Phase Shedding, Differential Remote Sense, External Synchronization, Resistor Set Frequency, Tracking, Power Good, No FET Drivers	Sub-Milliohm DCR Current Sense, Phase Shedding, Differential Remote Sense, External Synchronization, Resistor Set Frequency, Tracking, Power Good, No FET Drivers	Sub-Milliohm DCR Current Sense, Phase Shedding, Differential Remote Sense, External Synchronization, Resistor Set Frequency, Tracking, Power Good, No FET Drivers
Frequency, kHz	1200	1200	1200	1200
Frequency Adjust Range	200kHz - 1.2MHz	200kHz - 1.2MHz	200kHz - 1.2MHz	200kHz - 1.2MHz
Frequency Sync Range	200kHz - 1.2MHz	200kHz - 1.2MHz	200kHz - 1.2MHz	200kHz - 1.2MHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	40	40	40	40
Isupply, mA	9	9	9	9
Max Phases	2, 3, 4, 6, 8, 12	2, 3, 4, 6, 8, 12	2, 3, 4, 6, 8, 12	2, 3, 4, 6, 8, 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	30	30	30	30
Output Current 2, A	30	30	30	30
Polyphase	yes	yes	yes	yes
Sense Resistor	Sub-Milliohm DCR, DCR, Rsense	Sub-Milliohm DCR, DCR, Rsense	Sub-Milliohm DCR, DCR, Rsense	Sub-Milliohm DCR, DCR, Rsense
Switch Current, A	30	30	30	30
Switch Current 2, A	30	30	30	30
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	38	38	38	38
Vin Min, V	4.5	4.5	4.5	4.5
Vout Max, V	3.5	3.5	3.5	3.5
Vout Maximum	3.5V	3.5V	3.5V	3.5V
Vout Min, V	0.6	0.6	0.6	0.6
Vout Min 2, V	0.6	0.6	0.6	0.6
Vref Accuracy Over Temp, %	0.75	0.75	0.75	0.75

Eco Plan

	LTC3774EUHE#PBF	LTC3774EUHE#TRPBF	LTC3774IUHE#PBF	LTC3774IUHE#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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Dual Phase Buck Controller Drives High Density 1.2V/60A Supply with Submilliohm DCR Sensing &mdash DN528
PDF, 227 Kb, File published: May 22, 2014
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Dual Phase Buck Controller Drives High Density 1.2V/60A
Supply with Submilliohm DCR Sensing вЂ“ Design Note 528
Mike Shriver
Introduction
Designers of low output voltage rails for communication, networking, server and industrial systems are
challenged to achieve greater load currents and higher
efficiency in diminishing board space. The LTCВ®3774
dual output buck controller eases this burden by interfacing easily with DrMOS devices, providing high
efficiency and small size by integrating MOSFET and
gate driver in the same package. The LTC3774 can
sense current across the inductorвЂ™s DCR, with values as
low as 0.2mО©, improving efficiency by eliminating the
need for a discrete sense resistor. The LTC3774вЂ™s peak
current mode architecture provides cycle-by-cycle
current limit, inherent cycle-by-cycle current sharing
and easy to design typeВ II compensation. DrMOS Interface
The PWM outputs of the LTC3774 are designed to drive
DrMOS devices with a 3-state PWM input. When the
PWM signal is high, the top FET is on, and when the
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and
PolyPhase are registered trademarks and Hot Swap is a trademark of Linear
Technology Corporation. All other trademarks are the property of their
respective owners. 10k …

Articles

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Dual Phase Buck Controller Drives High Density 1.2V/60A Supply with Sub-Milliohm DCR Sensing &mdash LT Journal
PDF, 237 Kb, File published: Jul 1, 2014
Extract from the document
Dual Phase Buck Controller Drives High Density 1.2V/60A
Supply with Sub-Milliohm DCR Sensing
Mike Shriver Designers of low output voltage rails for communication, networking, server and
industrial systems are challenged to achieve greater load currents and higher
efficiency in diminishing board space. The LTC3774 dual output buck controller
eases this burden by interfacing easily with DrMOS devices, providing high efficiency
and small size by integrating MOSFET and gate driver in the same package. The
LTC3774 can sense current across the inductorвЂ™s DCR, with values as low as
0.2mО©, improving efficiency by eliminating the need for a discrete sense resistor.
The LTC3774вЂ™s peak current mode architecture provides cycle-by-cycle current limit,
inherent cycle-by-cycle current sharing and easy to design typeВ II compensation.
HIGH EFFICIENCY CONVERTER WITH
A SMALL FOOTPRINT Figure 1 shows a dual phase
1.2V/60A LTC3774 converter operating
at a switching frequency of 400kHz.
The power stage for each phase is the
FDMF6820A DrMOS, which comes in
a 6mm Г— 6mm QFN package, and a
0.3Вµ H single winding ferrite inductor with
a typical DCR of 0.325mО©. The resulting
full load efficiency is 89.8%, as shown
in Figure 2. The core of the converter
has a current density of 50A /in2. …

Model Line

Series: LTC3774 (4)

LTC3774EUHE#PBF LTC3774EUHE#TRPBF LTC3774IUHE#PBF LTC3774IUHE#TRPBF

Manufacturer's Classification

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