Datasheet Linear Technology LTC3785

Manufacturer	Linear Technology
Series	LTC3785

10V, High Efficiency, Synchronous, No RSENSE Buck-Boost Controller

Datasheets

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PDF, 287 Kb, Language: en, File uploaded: Sep 23, 2017, Pages: 20
10V, High Efficiency, Synchronous, No RSENSE Buck-Boost Controller

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Prices

Packaging

	LTC3785EUF#PBF	LTC3785EUF#TRPBF	LTC3785IUF#PBF	LTC3785IUF#TRPBF
N	1	2	3	4
Package	4x4 QFN-24 Package Outline Drawing	4x4 QFN-24 Package Outline Drawing	4x4 QFN-24 Package Outline Drawing	4x4 QFN-24 Package Outline Drawing
Package Code	UF	UF	UF	UF
Package Index	05-08-1697	05-08-1697	05-08-1697	05-08-1697
Pin Count	24	24	24	24

Parametrics

Parameters / Models	LTC3785EUF#PBF	LTC3785EUF#TRPBF	LTC3785IUF#PBF	LTC3785IUF#TRPBF
Architecture	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
Export Control	no	no	no	no
Features	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
Frequency, kHz	1000	1000	1000	1000
Frequency Adjust Range	100kHz - 1MHz	100kHz - 1MHz	100kHz - 1MHz	100kHz - 1MHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	15	15	15	15
Isupply, mA	0.086	0.086	0.086	0.086
Monolithic	no	no	no	no
Number of Outputs	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 85	-40 to 85
Output Current, A	10	10	10	10
Polyphase	no	no	no	no
Sense Resistor	None	None	None	None
Synchronous	yes	yes	yes	yes
Topology	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost
Vin Max, V	10	10	10	10
Vin Min, V	2.7	2.7	2.7	2.7
Vout Max, V	10	10	10	10
Vout Min, V	2.7	2.7	2.7	2.7

Eco Plan

	LTC3785EUF#PBF	LTC3785EUF#TRPBF	LTC3785IUF#PBF	LTC3785IUF#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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Buck-Boost Controller Simplifies Design of DC/DC Converters for Handheld Products &mdash DN424
PDF, 96 Kb, File published: Sep 14, 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 …

Articles

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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 Kb, File published: Oct 16, 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 …

Model Line

Series: LTC3785 (4)

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

Manufacturer's Classification

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