Datasheet Linear Technology LTC3605

Manufacturer	Linear Technology
Series	LTC3605

15V, 5A Synchronous Step-Down Regulator

Datasheets

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PDF, 341 Kb, Language: en, File uploaded: Sep 22, 2017, Pages: 22
15V, 5A Synchronous Step-Down Regulator

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Packaging

	LTC3605EUF#PBF	LTC3605EUF#TRPBF	LTC3605IUF#PBF	LTC3605IUF#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	LTC3605EUF#PBF	LTC3605EUF#TRPBF	LTC3605IUF#PBF	LTC3605IUF#TRPBF
Architecture	Constant Frequency Controlled On-Time Current Mode	Constant Frequency Controlled On-Time Current Mode	Constant Frequency Controlled On-Time Current Mode	Constant Frequency Controlled On-Time Current Mode
Demo Boards	DC1215A	DC1215A	DC1215A	DC1215A
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	PolyPhase, Resistor Set Frequency, External Synchronization, Tracking	PolyPhase, Resistor Set Frequency, External Synchronization, Tracking	PolyPhase, Resistor Set Frequency, External Synchronization, Tracking	PolyPhase, Resistor Set Frequency, External Synchronization, Tracking
Frequency, kHz	4000	4000	4000	4000
Frequency Adjust Range	800kHz - 4MHz	800kHz - 4MHz	800kHz - 4MHz	800kHz - 4MHz
Frequency Sync Range	800kHz - 4MHz	800kHz - 4MHz	800kHz - 4MHz	800kHz - 4MHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	11	11	11	11
Isupply, mA	2	2	2	2
Max Phases	1	1	1	1
Monolithic	yes	yes	yes	yes
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	5	5	5	5
Polyphase	no	no	no	no
Switch Current, A	6	6	6	6
Synchronous	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck
Vin Max, V	15	15	15	15
Vin Min, V	4	4	4	4
Vout Max, V	14.85	14.85	14.85	14.85
Vout Maximum	0.99Vin	0.99Vin	0.99Vin	0.99Vin
Vout Min, V	0.6	0.6	0.6	0.6

Eco Plan

	LTC3605EUF#PBF	LTC3605EUF#TRPBF	LTC3605IUF#PBF	LTC3605IUF#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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15VIN, 4MHz Monolithic Synchronous Buck Regulator Delivers 5A in 4mm Г— 4mm QFN &mdash DN467
PDF, 101 Kb, File published: May 29, 2009
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15VIN, 4MHz Monolithic Synchronous Buck Regulator Delivers
5A in 4mm Г— 4mm QFN вЂ“ Design Note 467
Tom Gross
Introduction
The LTCВ®3605 is a high efп¬Ѓciency, monolithic synchronous
step-down switching regulator that is capable of delivering
5A of continuous output current from input voltages of
4V to 15V. Its compact 4mm Г— 4mm QFN package has
very low thermal impedance from the IC junction to the
PCB, such that the regulator can deliver maximum power
without the need of a heat sink. A single LTC3605 circuit
can power a 1.2V microprocessor directly from a 12V
railвЂ”no need for an intermediate voltage rail.
The LTC3605 employs a unique controlled on-time/constant frequency current mode architecture, making it ideal
for low duty cycle applications and high frequency operation. There are two phase-lock loops inside the LTC3605:
one servos the regulator on-time to track the internal
oscillator frequency, which is determined by an external
timing resistor, and the other servos the internal oscillator
to an external clock signal if the part is synchronized. Due
to the controlled on-time design, the LTC3605 can achieve
very fast load transient response while minimizing the
number and value of external output capacitors.
The LTC3605вЂ™s switching frequency is programmable from …

Articles

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15VIN, 4MHz Monolithic Synchronous Buck Regulator Delivers 5A in 4mm × 4mm QFN &mdash LT Journal
PDF, 307 Kb, File published: Jun 1, 2009
Extract from the document
DESIGN IDEASвЂ‰L 15VIN, 4MHz Monolithic
Synchronous Buck Regulator
Delivers 5A in 4mm Г— 4mm QFN
Introduction
The LTC3605 is a high efficiency,
monolithic synchronous step-down
switching regulator that is capable
of delivering 5A of continuous output
current from input voltages of 4V to
15V. Its compact 4mm Г— 4mm QFN
package has very low thermal impedance from the IC junction to the PCB,
such that the regulator can deliver
maximum power without the need of
a heat sink. A single LTC3605 circuit
can power a 1.2V microprocessor
directly from a 12V railвЂ”no need for
an intermediate voltage rail.
The LTC3605 employs a unique controlled on-time/constant frequency
current mode architecture, making
it ideal for low duty cycle applications
and high frequency operation. There
are two phase-lock loops inside the
LTC3605: one servos the regulator …

Model Line

Series: LTC3605 (4)

LTC3605EUF#PBF LTC3605EUF#TRPBF LTC3605IUF#PBF LTC3605IUF#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Internal Power Switch Buck

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