Datasheet Linear Technology LTC3785 — Даташит

Производитель	Linear Technology
Серия	LTC3785

10 В, высокоэффективный, синхронный, без повышающе-понижающего контроллера RSENSE

Datasheets

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PDF, 287 Кб, Язык: анг., Файл закачен: 23 сен 2017, Страниц: 20
10V, High Efficiency, Synchronous, No RSENSE Buck-Boost Controller

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Масштаб. Поставляем промышленную память с гарантией 12 месяцев

Корпус / Упаковка / Маркировка

	LTC3785EUF#PBF	LTC3785EUF#TRPBF	LTC3785IUF#PBF	LTC3785IUF#TRPBF
N	1	2	3	4
Корпус	4x4 QFN-24 Габаритный чертеж корпуса	4x4 QFN-24 Габаритный чертеж корпуса	4x4 QFN-24 Габаритный чертеж корпуса	4x4 QFN-24 Габаритный чертеж корпуса
Код корпуса	UF	UF	UF	UF
Индекс корпуса	05-08-1697	05-08-1697	05-08-1697	05-08-1697
Количество выводов	24	24	24	24

Параметры

Parameters / Models	LTC3785EUF#PBF	LTC3785EUF#TRPBF	LTC3785IUF#PBF	LTC3785IUF#TRPBF
Архитектура	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC957A	DC957A	DC957A	DC957A
Design Tools	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model
Экспортный контроль	нет	нет	нет	нет
Основные особенности	Burst Mode, No Rsense, Output Disconnect, Resistor Set Frequency	Burst Mode, No Rsense, Output Disconnect, Resistor Set Frequency	Burst Mode, No Rsense, Output Disconnect, Resistor Set Frequency	Burst Mode, No Rsense, Output Disconnect, Resistor Set Frequency
Тактовая частота, kHz	1000	1000	1000	1000
Frequency Adjust Range	100kHz - 1MHz	100kHz - 1MHz	100kHz - 1MHz	100kHz - 1MHz
Integrated Inductor	нет	нет	нет	нет
Ishutdown, мкА	15	15	15	15
Isupply, мА	0.086	0.086	0.086	0.086
Monolithic	нет	нет	нет	нет
Количество выходов	1	1	1	1
Рабочий диапазон температур, °C	от 0 до 85	от 0 до 85	от -40 до 85	от -40 до 85
Выходной ток, A	10	10	10	10
Polyphase	нет	нет	нет	нет
Sense Resistor	None	None	None	None
Synchronous	да	да	да	да
Topology	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost
Vin Max, В	10	10	10	10
Vin Min, В	2.7	2.7	2.7	2.7
Vout Max, В	10	10	10	10
Vout Min, В	2.7	2.7	2.7	2.7

Экологический статус

	LTC3785EUF#PBF	LTC3785EUF#TRPBF	LTC3785IUF#PBF	LTC3785IUF#TRPBF
RoHS	Совместим	Совместим	Совместим	Совместим

Design Notes

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Buck-Boost Controller Simplifies Design of DC/DC Converters for Handheld Products &mdash DN424
PDF, 96 Кб, Файл опубликован: 14 сен 2007
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advertisement Buck-Boost Controller Simplifies Design of DC/DC Converters for
Handheld Products вЂ“ Design Note 424
David Burgoon
range. The high level of integration yields a simple, low
parts-count solution. The LTC3785 provides for currentlimit and shutdown in all modes of operation (which is
not normally available with boost converters). Introduction
A number of conventional solutions have been available for
the design of a DC/DC converter where the output voltage
is within the input voltage rangeвЂ”a common scenario
in Li-Ion battery-powered applicationsвЂ”but none were
very attractive until now. Conventional topologies, such
as SEPIC or boost followed by buck, have numerous
disadvantages, including low efп¬Ѓciency, complex magnetics, polarity inversion and/or circuit complexity/cost. The
LTCВ®3785 buck-boost controller yields a simple, efп¬Ѓcient,
low parts-count, single-converter solution that is easy
to implement, thus avoiding the drawbacks associated
with traditional solutions. Very high efп¬Ѓciency is achieved by synchronous rectiп¬Ѓcation, high side drive (allowing the use of N-channel
MOSFETs), RDS(ON) current sensing, and Burst Mode В®
operation for efп¬Ѓcient light load operation. Protection
features include soft-start, overvoltage, undervoltage
and foldback current-limit with burp-mode or latch-off
for extended faults.
3.3V, 3A Converter Operates from 2.7V вЂ“ 10V Source …

Статьи

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Single-IC Converter Operates Buck and Boost to Provide an Output that is Within the Input Voltage Range &mdash LT Journal
PDF, 384 Кб, Файл опубликован: 16 окт 2007
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LвЂ‰DESIGN IDEAS Single-IC Converter Operates
Buck and Boost to Provide an Output
that is Within the Input Voltage Range
by David Burgoon Introduction
Generating an output voltage that
is always above or below the input
voltage range can easily be handled
by conventional boost or buck regulators, respectively. However, when the
output voltage is within the input voltage range, as in many Li-Ion battery
powered applications requiring a 3V
or 3.3V output, conventional designs
fall short, suffering variously from low
efficiency, complex magnetics, polarity inversion and circuit complexity.
The LTC3785 buck-boost controller
facilitates a simple, efficient, low partscount, single-converter solution that is
easy to implement and does not have
any of the drawbacks associated with
conventional circuits. tion (OVP) and a 2.7VвЂ“10V output
range.
The circuit produces seamless operation throughout the input voltage
range, operating as a synchronous
buck converter, synchronous boost
2.2nF VOUT …

Модельный ряд

Серия: LTC3785 (4)

LTC3785EUF#PBF LTC3785EUF#TRPBF LTC3785IUF#PBF LTC3785IUF#TRPBF

Классификация производителя

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