Datasheet Linear Technology LTC3728

Manufacturer	Linear Technology
Series	LTC3728

Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator

Datasheets

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PDF, 1.7 Mb, Language: en, File uploaded: Sep 22, 2017, Pages: 36
Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator

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Prices

Packaging

	LTC3728EG#PBF	LTC3728EG#TRPBF	LTC3728EUH#PBF	LTC3728EUH#TRPBF	LTC3728IG#PBF	LTC3728IG#TRPBF	LTC3728IUH#PBF	LTC3728IUH#TRPBF
N	1	2	3	4	5	6	7	8
Package	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing
Package Code	G	G	UH	UH	G	G	UH	UH
Package Index	05-08-1640 (G28)	05-08-1640 (G28)	05-08-1693	05-08-1693	05-08-1640 (G28)	05-08-1640 (G28)	05-08-1693	05-08-1693
Pin Count	28	28	32	32	28	28	32	32

Parametrics

Parameters / Models	LTC3728EG#PBF	LTC3728EG#TRPBF	LTC3728EUH#PBF	LTC3728EUH#TRPBF	LTC3728IG#PBF	LTC3728IG#TRPBF	LTC3728IUH#PBF	LTC3728IUH#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC392A-B,DC447A,DC542A	DC392A-B,DC447A,DC542A	DC392A-B,DC447A,DC542A	DC392A-B,DC447A,DC542A	DC392A-B,DC447A,DC542A	DC392A-B,DC447A,DC542A	DC392A-B,DC447A,DC542A	DC392A-B,DC447A,DC542A
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File
Export Control	no	no	no	no	no	no	no	no
Features	PolyPhase, External Synchronization, Power Good, Burst Mode	PolyPhase, External Synchronization, Power Good, Burst Mode	PolyPhase, External Synchronization, Power Good, Burst Mode	PolyPhase, External Synchronization, Power Good, Burst Mode	PolyPhase, External Synchronization, Power Good, Burst Mode	PolyPhase, External Synchronization, Power Good, Burst Mode	PolyPhase, External Synchronization, Power Good, Burst Mode	PolyPhase, External Synchronization, Power Good, Burst Mode
Frequency, kHz	550	550	550	550	550	550	550	550
Frequency Sync Range	250kHz - 550kHz	250kHz - 550kHz	250kHz - 550kHz	250kHz - 550kHz	250kHz - 550kHz	250kHz - 550kHz	250kHz - 550kHz	250kHz - 550kHz
Integrated Inductor	no	no	no	no	no	no	no	no
Ishutdown, µA	20	20	20	20	20	20	20	20
Isupply, mA	0.47	0.47	0.47	0.47	0.47	0.47	0.47	0.47
Max Phases	2	2	2	2	2	2	2	2
Monolithic	no	no	no	no	no	no	no	no
Number of Outputs	2	2	2	2	2	2	2	2
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85	0 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Output Current, A	25	25	25	25	25	25	25	25
Output Current 2, A	25	25	25	25	25	25	25	25
Polyphase	yes	yes	yes	yes	yes	yes	yes	yes
Sense Resistor	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense
Switch Current, A	25	25	25	25	25	25	25	25
Switch Current 2, A	25	25	25	25	25	25	25	25
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Vin Max, V	36	36	36	36	36	36	36	36
Vin Min, V	4	4	4	4	4	4	4	4
Vout Max, V	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5
Vout Maximum	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V
Vout Min, V	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
Vout Min 2, V	.8	.8	.8	.8	.8	.8	.8	.8
Vref Accuracy Over Temp, %	1	1	1	1	1	1	1	1

Eco Plan

	LTC3728EG#PBF	LTC3728EG#TRPBF	LTC3728EUH#PBF	LTC3728EUH#TRPBF	LTC3728IG#PBF	LTC3728IG#TRPBF	LTC3728IUH#PBF	LTC3728IUH#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Design Notes

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Active Voltage Positioning Reduces Output Capacitors &mdash Design Solutions 10
PDF, 130 Kb, File published: Nov 1, 1999
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Design Solutions 10
November 1999
Active Voltage Positioning Reduces Output Capacitors
by Robert Sheehan
INTRODUCTION
Power supply performance, especially transient response,
is key to meeting todayвЂ™s demands for low voltage, high
current microprocessor power. In an effort to minimize
the voltage deviation during a load step, a technique that
has recently been coined вЂњactive voltage positioningвЂќ is
generating substantial interest and gaining popularity in
the portable computer market. The benefits include lower
peak-to-peak output voltage deviation for a given load
step, without having to increase the output filter capacitance. Alternatively, the output filter capacitance can be
reduced while maintaining the same peak-to-peak transient response.
BASIC PRINCIPLE
The term вЂњactive voltage positioningвЂќ (AVP) refers to
setting the power supply output voltage at a point that is
dependent on the load current. At minimum load, the
output voltage is set to a slightly higher than nominal level.
At full load, the output voltage is set to a slightly lower than
nominal level. Effectively, the DC load regulation is
degraded, but the load transient voltage deviation will be …

Articles

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Low Voltage, High Current DC/DC Power Supply with Load Sharing and Redundancy &mdash LT Journal
PDF, 183 Kb, File published: Aug 9, 2004
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DESIGN IDEAS Low Voltage, High Current DC/DC
Power Supply with Load Sharing and
Redundancy
by Henry J. Zhang and Wei Chen
Introduction
As computer and networking systems
get larger and faster, their supply
currents continue to rise and their
supply voltages continue to drop. Load
currents are high enough to require
that power supply designers use several power supply modules in parallel.
High performance power supplies for
data-processing and communication
equipment must also provide exceptional reliability and fault tolerance.
For example, power systems for mission-critical data processing systems
are must be functional better than
99.999% of the time. To satisfy the
needs of these systems, the power
management solution must provide
load sharing, fault tolerance and redundancy.
This article presents a power management solution that offers all of
these features in a relatively simple
circuit that uses the LTC3729 …

Model Line

Series: LTC3728 (8)

LTC3728EG#PBF LTC3728EG#TRPBF LTC3728EUH#PBF LTC3728EUH#TRPBF LTC3728IG#PBF LTC3728IG#TRPBF LTC3728IUH#PBF LTC3728IUH#TRPBF

Manufacturer's Classification

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