Datasheet Linear Technology LTC3789 — Datenblatt

Hersteller	Linear Technology
Serie	LTC3789

Hocheffizienter, synchroner Buck-Boost-Controller mit 4 Schaltern

Datenblätter

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PDF, 543 Kb, Sprache: en, Datei hochgeladen: Sep 23, 2017, Seiten: 30
High Efficiency, Synchronous, 4-Switch Buck-Boost Controller

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Verpackung

	LTC3789EGN#PBF	LTC3789EGN#TRPBF	LTC3789EUFD#PBF	LTC3789EUFD#TRPBF	LTC3789IGN#PBF	LTC3789IGN#TRPBF	LTC3789IUFD#PBF	LTC3789IUFD#TRPBF
N	1	2	3	4	5	6	7	8
Package	SSOP-28 Paketumrisszeichnung	SSOP-28 Paketumrisszeichnung	4x5 QFN-28 Paketumrisszeichnung	4x5 QFN-28 Paketumrisszeichnung	SSOP-28 Paketumrisszeichnung	SSOP-28 Paketumrisszeichnung	4x5 QFN-28 Paketumrisszeichnung	4x5 QFN-28 Paketumrisszeichnung
Package Code	GN	GN	UFD	UFD	GN	GN	UFD	UFD
Package Index	05-08-1641 (GN28)	05-08-1641 (GN28)	05-08-1712	05-08-1712	05-08-1641 (GN28)	05-08-1641 (GN28)	05-08-1712	05-08-1712
Pin Count	28	28	28	28	28	28	28	28

Parameter

Parameters / Models	LTC3789EGN#PBF	LTC3789EGN#TRPBF	LTC3789EUFD#PBF	LTC3789EUFD#TRPBF	LTC3789IGN#PBF	LTC3789IGN#TRPBF	LTC3789IUFD#PBF	LTC3789IUFD#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	DC1881A,DC1523A,DC1721A,DC1878A,DC2253A,DC1757B	DC1881A,DC1523A,DC1721A,DC1878A,DC2253A,DC1757B	DC1881A,DC1523A,DC1721A,DC1878A,DC2253A,DC1757B	DC1881A,DC1523A,DC1721A,DC1878A,DC2253A,DC1757B	DC1881A,DC1523A,DC1721A,DC1878A,DC2253A,DC1757B	DC1881A,DC1523A,DC1721A,DC1878A,DC2253A,DC1757B	DC1881A,DC1523A,DC1721A,DC1878A,DC2253A,DC1757B	DC1881A,DC1523A,DC1721A,DC1878A,DC2253A,DC1757B
Design Tools	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File
Export Control	no	no	no	no	no	no	no	no
Features	External Synchronization, Power Good, Output Disconnect	External Synchronization, Power Good, Output Disconnect	External Synchronization, Power Good, Output Disconnect	External Synchronization, Power Good, Output Disconnect	External Synchronization, Power Good, Output Disconnect	External Synchronization, Power Good, Output Disconnect	External Synchronization, Power Good, Output Disconnect	External Synchronization, Power Good, Output Disconnect
Frequency, kHz	600	600	600	600	600	600	600	600
Frequency Sync Range	200kHz to 600kHz	200kHz to 600kHz	200kHz to 600kHz	200kHz to 600kHz	200kHz to 600kHz	200kHz to 600kHz	200kHz to 600kHz	200kHz to 600kHz
Integrated Inductor	no	no	no	no	no	no	no	no
Ishutdown, µA	40	40	40	40	40	40	40	40
Isupply, mA	3	3	3	3	3	3	3	3
Monolithic	no	no	no	no	no	no	no	no
Number of Outputs	1	1	1	1	1	1	1	1
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	10	10	10	10	10	10	10	10
Polyphase	no	no	no	no	no	no	no	no
Sense Resistor	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost
Vin Max, V	38	38	38	38	38	38	38	38
Vin Min, V	4	4	4	4	4	4	4	4
Vout Max, V	38	38	38	38	38	38	38	38
Vout Maximum	38V	38V	38V	38V	38V	38V	38V	38V
Vout Min, V	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
Vswitch Max, V	38	38	38	38	38	38	38	38

Öko-Plan

	LTC3789EGN#PBF	LTC3789EGN#TRPBF	LTC3789EUFD#PBF	LTC3789EUFD#TRPBF	LTC3789IGN#PBF	LTC3789IGN#TRPBF	LTC3789IUFD#PBF	LTC3789IUFD#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Anwendungshinweise

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Basic Concepts of Linear Regulator and Switching Mode Power Supplies &mdash AN140
PDF, 715 Kb, Datei veröffentlicht: Oct 1, 2013
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Application Note 140
October 2013
Basic Concepts of Linear Regulator and Switching
Mode Power Supplies
Henry J. Zhang
ABSTRACT
This article explains the basic concepts of linear regulators
and switching mode power supplies (SMPS). It is aimed
at system engineers who may not be very familiar with
power supply designs and selection. The basic operating
principles of linear regulators and SMPS are explained
and the advantages and disadvantages of each solution
are discussed. The buck step-down converter is used as
an example to further explain the design considerations
of a switching regulator.
INTRODUCTION
TodayвЂ™s designs require an increasing number of power
rails and supply solutions in electronics systems, with
loads ranging from a few mA for standby supplies to over
100A for ASIC voltage regulators. It is important to choose
the appropriate solution for the targeted application and
to meet specified performance requirements, such as
high efficiency, tight printed circuit board (PCB) space, …

Konstruktionshinweise

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High Efficiency 4-Switch Buck-Boost Controller Provides Accurate Output Current Limit &mdash DN499
PDF, 116 Kb, Datei veröffentlicht: Feb 22, 2012
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advertisement High Efficiency 4-Switch Buck-Boost Controller Provides
Accurate Output Current Limit вЂ“ Design Note 499
Tage Bjorklund
Introduction
A 4-switch buck-boost converter (Figure 1) is often a
better alternative to a transformer-based topology when
a converterвЂ™s input voltage can be above or below the
regulated output voltage and isolation is not required.
A buck-boost converter provides a wider input voltage
range, better efп¬Ѓciency and has no need of a bulky
transformer. A buck-boost converter is much more
efп¬Ѓcient than a comparable SEPIC converter.
The LTC В®3789 is a buck-boost switching regulator
controller that operates in current mode at a constant
switching frequency. Current mode control simpliп¬Ѓes
loop compensation and yields excellent load and line
transient response with only small output and input
capacitance. Furthermore, an accurate inductor current
limit allows use of a small size inductor. The LTC3789 includes two internal series regulators that
provide 5.5V for gate drivers and control circuitry. During
start-up the current is drawn from VIN (40V maximum
rating), but switches to EXTVCC (14V maximum rating)
as soon as the voltage on EXTVCC exceeds 4.8V, to …

Modellreihe

Serie: LTC3789 (8)

LTC3789EGN#PBF LTC3789EGN#TRPBF LTC3789EUFD#PBF LTC3789EUFD#TRPBF LTC3789IGN#PBF LTC3789IGN#TRPBF LTC3789IUFD#PBF LTC3789IUFD#TRPBF

Herstellerklassifikation

Power Management > Switching Regulator > Buck-Boost Regulators > External Power Switch Buck-Boost