Datasheet Linear Technology LTC1876 — 数据表

制造商	Linear Technology
系列	LTC1876

高效，两相，双同步降压开关控制器和升压调节器

数据表

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PDF, 372 Kb, 语言: en, 文件上传: Sep 20, 2017, 页数: 36
High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator

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价格

打包

	LTC1876EG#PBF	LTC1876EG#TRPBF
N	1	2
Package	SSOP-36 包装外形图	SSOP-36 包装外形图
Package Code	G	G
Package Index	05-08-1640 (G36)	05-08-1640 (G36)
Pin Count	36	36

参数化

Parameters / Models	LTC1876EG#PBF	LTC1876EG#TRPBF
Boost Switch Current, A	1	1
Buck Output Current, A	25, 25	25, 25
Demo Boards	DC324A,DC386A	DC324A,DC386A
Export Control	no	no
Features	PolyPhase	PolyPhase
Number of Outputs	3	3
Operating Temperature Range, °C	0 to 85	0 to 85
Vin Max, V	36	36
Vin Min, V	3.5	3.5

生态计划

	LTC1876EG#PBF	LTC1876EG#TRPBF
RoHS	Compliant	Compliant

设计须知

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Active Voltage Positioning Reduces Output Capacitors &mdash Design Solutions 10
PDF, 130 Kb, 档案已发布: Nov 1, 1999
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Design Solutions 10
November 1999
Active Voltage Positioning Reduces Output Capacitors
by Robert Sheehan
INTRODUCTION
Power supply performance, especially transient response,
is key to meeting todayвЂ™s demands for low voltage, high
current microprocessor power. In an effort to minimize
the voltage deviation during a load step, a technique that
has recently been coined вЂњactive voltage positioningвЂќ is
generating substantial interest and gaining popularity in
the portable computer market. The benefits include lower
peak-to-peak output voltage deviation for a given load
step, without having to increase the output filter capacitance. Alternatively, the output filter capacitance can be
reduced while maintaining the same peak-to-peak transient response.
BASIC PRINCIPLE
The term вЂњactive voltage positioningвЂќ (AVP) refers to
setting the power supply output voltage at a point that is
dependent on the load current. At minimum load, the
output voltage is set to a slightly higher than nominal level.
At full load, the output voltage is set to a slightly lower than
nominal level. Effectively, the DC load regulation is
degraded, but the load transient voltage deviation will be …
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Efficient DC/DC Converter Provides Two 15A Outputs from a 3.3V Backplane &mdash DN278
PDF, 86 Kb, 档案已发布: Feb 2, 2002
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advertisement Efficient DC/DC Converter Provides Two 15A Outputs
from a 3.3V Backplane вЂ“ Design Note 278
David Chen
converter to around 85%. A more efп¬Ѓcient solution is to
use logic-level MOSFETs, which have very low RDS(ON)
but require a 5V supply. The LTC В®1876 allows the use
of logic-level MOSFETs by combining a 1.2MHz boost
regulator, which produces a 5V bias supply from a 3.3V
input, with two step-down controllers, which provide the
low voltage outputs. By integrating all three regulators
in a single IC, the LTC1876 makes for efп¬Ѓcient power
supplies that can be small and inexpensive. Introduction
The 3.3V DC bus has become popular for broadband
networking systems, where it is tapped for a variety
of lower voltages to power DSPs, ASICs and FPGAs.
These lower voltages range from 1V to 2.5V and often
require high load currents. To maintain high conversion
efп¬Ѓciency, power MOSFET conduction losses from the
step-down converters must be minimized. The problem
is that the 3.3V bus also brings with it frequent use of
sub-logic level MOSFETs. Such MOSFETs have a relatively high RDS(ON), limiting the full-load efп¬Ѓciency of a L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners. …

文章

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Efficient DC/DC Converter Provides Two 15A Outputs from a 3.3V Backplane &mdash LT Journal
PDF, 68 Kb, 档案已发布: May 1, 2002
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DESIGN IDEAS Efficient DC/DC Converter Provides
Two 15A Outputs from a 3.3V
by David Chen
Backplane
Introduction
converter to around 85%. A more
efficient solution is to use logic-level
MOSFETs, which have very low RDS(ON)
but require a 5V supply. The LTC1876
allows the use of logic-level MOSFETs
by combining a 1.2MHz boost regulator, which produces a 5V bias supply
from a 3.3V input, with two stepdown controllers, which provide the
low voltage outputs. By integrating
all three regulators in a single IC, the
LTC1876 makes for efficient power
supplies that can be small and inexpensive. 96
94
OVERALL EFFICIENCY (%) The 3.3V DC bus has become popular
for broadband networking systems,
where it is tapped for a variety of
lower voltages to power DSPs, ASICs
and FPGAs. These lower voltages
range from 1V to 2.5V and often require high load currents. To maintain …
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Triple, High Output Current Supply Requires only 3.3V Input and Minimal Input Capacitance &mdash LT Journal
PDF, 163 Kb, 档案已发布: Nov 1, 2000
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DESIGN IDEAS Triple, High Output Current Supply
Requires only 3.3V Input and
Minimal Input Capacitance
by San-Hwa Chee
Introduction
trollers allow off-the-shelf inductors
to be used instead of bulky, customwound transformers. The PolyPhaseв„ў
architecture of the step-down controllers minimizes input capacitance
requirements, reducing overall system cost and footprint. A built-in boost
regulator provides a third output. 0.1ВµF
1
2
42.2k
1% 1000pF 3 20k
1% 4
5 0.01ВµF
6
220pF 7
8 6.8k 470pF 9 220pF
3.3VOUT 10 470pF
11
6.8k
12 …

模型线

系列: LTC1876 (2)

LTC1876EG#PBF LTC1876EG#TRPBF

制造商分类

Power Management > PMIC & Multifunction > Multitopology DC/DC
Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | External Power Switch Buck Controllers