Datasheet Linear Technology LTC1702A — 数据表

制造商	Linear Technology
系列	LTC1702A

双路550kHz同步2相开关稳压器控制器

数据表

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PDF, 427 Kb, 语言: en, 文件上传: Sep 20, 2017, 页数: 36
Dual 550kHz Synchronous 2-Phase Switching Regulator Controller

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	LTC1702ACGN#PBF	LTC1702ACGN#TRPBF	LTC1702AIGN#PBF	LTC1702AIGN#TRPBF
N	1	2	3	4
Package	SSOP-24 包装外形图	SSOP-24 包装外形图	SSOP-24 包装外形图	SSOP-24 包装外形图
Package Code	GN	GN	GN	GN
Package Index	05-08-1641 (GN24)	05-08-1641 (GN24)	05-08-1641 (GN24)	05-08-1641 (GN24)
Pin Count	24	24	24	24

参数化

Parameters / Models	LTC1702ACGN#PBF	LTC1702ACGN#TRPBF	LTC1702AIGN#PBF	LTC1702AIGN#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC275A,DC473A	DC275A,DC473A	DC275A,DC473A	DC275A,DC473A
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File
Export Control	no	no	no	no
Features	No Rsense, PolyPhase	No Rsense, PolyPhase	No Rsense, PolyPhase	No Rsense, PolyPhase
Frequency, kHz	550	550	550	550
Integrated Inductor	no	no	no	no
Ishutdown, µA	30	30	30	30
Isupply, mA	2.2	2.2	2.2	2.2
Max Phases	2	2	2	2
Monolithic	no	no	no	no
Number of Outputs	2	2	2	2
Operating Temperature Range, °C	0 to 70	0 to 70	-40 to 85	-40 to 85
Output Current, A	20	20	20	20
Output Current 2, A	20	20	20	20
Polyphase	yes	yes	yes	yes
Sense Resistor	None	None	None	None
Switch Current, A	20	20	20	20
Switch Current 2, A	20	20	20	20
Synchronous	no	no	no	no
Topology	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck
Vin Max, V	7	7	7	7
Vin Min, V	3	3	3	3
Vout Max, V	7	7	7	7
Vout Maximum	Vin	Vin	Vin	Vin
Vout Min, V	0.8	0.8	0.8	0.8
Vout Min 2, V	.8	.8	.8	.8
Vref Accuracy Over Temp, %	1	1	1	1

生态计划

	LTC1702ACGN#PBF	LTC1702ACGN#TRPBF	LTC1702AIGN#PBF	LTC1702AIGN#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

设计须知

下载
2-Phase DC/DC Controller Reduces Capacitanceand Increases Battery Life in Portable Applications &mdash Design Solutions 9
PDF, 106 Kb, 档案已发布: Jun 1, 1999
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Design Solutions 9
June 1999
2-Phase DC/DC Controller Reduces Capacitance
and Increases Battery Life in Portable Applications
The LTCВ®1628 dual high efficiency DC/DC controller brings
the considerable benefits of 2-phase operation to portable
applications for the first time. Notebook computers, PDAs,
handheld terminals and automotive electronics will all
benefit from the lower input filtering requirement, reduced
electromagnetic interference (EMI) and increased efficiency associated with 2-phase operation. coming from the switches, greatly reducing the overlap
time where they add together (see Figure 1). The result is
a significant reduction in total RMS input current, which,
in turn, allows less expensive input capacitors to be used,
reduces shielding requirements for EMI and improves real
world operating efficiency.
Figure 2 compares the input waveforms for a representative 1-phase dual switching regulator to the new LTC1628
2-phase dual switching regulator. An actual measurement
of the RMS input current under these conditions shows
that 2-phase operation lowers the input current from
2.53ARMS to 1.55ARMS. Why the need for 2-phase operation? Before the LTC1628,
constant-frequency dual switching regulators operated
both channels in phase (i.e., 1-phase operation). This
means that both switches turned on at the same time, …

文章

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30V, Dual Output Regulator Controller is Efficient, Rich in Features, and Saves Space &mdash LT Journal
PDF, 1.0 Mb, 档案已发布: Mar 25, 2005
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DESIGN FEATURES 30V, Dual Output Regulator Controller
is Efп¬Ѓcient, Rich in Features,
and Saves Space by Teo Yang Long and Theo Phillips
Introduction
The LTC3802 is designed to excel in
generating low output voltages from
high input voltages, a common problem for the power supplies of fast CPUs.
It is the latest in Linear TechnologyвЂ™s
family of high speed, voltage feedback,
synchronous step-down regulator
controllers. It retains the constant
frequency architecture and Burst
ModeВ® operation of the LTC1702A,
while improving on its performance
and adding features (see Table 1).
The input supply operating range
is extended from a nominal 5V to the
entire 3VвЂ“30V range. The internal
reference voltage has decreased, allowing the output to go as low as
0.6V. An advanced modulation scheme
facilitates these low duty cycles and
fast switching frequencies. The two
channels are still run 180В° out of …

模型线

系列: LTC1702A (4)

LTC1702ACGN#PBF LTC1702ACGN#TRPBF LTC1702AIGN#PBF LTC1702AIGN#TRPBF

制造商分类

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