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LTC1701ES5 参数 Datasheet PDF下载

LTC1701ES5图片预览
型号: LTC1701ES5
PDF下载: 下载PDF文件 查看货源
内容描述: 采用SOT -23为1MHz降压型DC / DC转换器 [1MHz Step-Down DC/DC Converter in SOT-23]
分类和应用: 转换器
文件页数/大小: 12 页 / 142 K
品牌: LINER [ LINEAR TECHNOLOGY ]
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Final Electrical Specifications
LTC1701
1MHz Step-Down
DC/DC Converter in SOT-23
December 1999
FEATURES
s
s
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s
DESCRIPTIO
s
s
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Tiny 5-Lead SOT-23 Package
Uses Tiny Capacitors and Inductor
High Frequency Operation: 1MHz
High Output Current: 500mA
Low R
DS(ON)
Internal Switch: 0.28Ω
High Efficiency: Up to 94%
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Quiescent Current: 135µA
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I
Q
< 1µA
Peak Inductor Current Independent of Inductor Value
Output Voltages from 5V Down to 1.25V
The LTC
®
1701 is the industry’s first 5-lead SOT-23 step
down, current mode, DC/DC converter. Intended for small
to medium power applications, it operates from 2.5V to
5.5V input voltage range and switches at 1MHz, allowing
the use of tiny, low cost capacitors and inductors 2mm or
less in height. The output voltage is adjustable from 1.25V
to 5V. A built-in 0.28Ω switch allows up to 0.5A of output
current at high efficiency. OPTI-LOOP
TM
compensation
allows the transient response to be optimized over a wide
range of loads and output capacitors.
The LTC1701 incorporates automatic power saving Burst
Mode
TM
operation to reduce gate charge losses when the
load current drops below the level required for continuous
operation. With no load, the converter draws only 135µA.
In shutdown, it draws less than 1µA, making it ideal for
current sensitive applications.
In dropout, the internal P-channel MOSFET switch is
turned on continuously, thereby maximizing battery life.
Its small size and switching frequency enables the com-
plete DC/DC converter function to consume less than 0.3
square inches of PC board area.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
APPLICATIO S
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PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Handheld Equipment
TYPICAL APPLICATIO
V
IN
2.5V TO
5.5V
R4
1M
V
IN
SW
L1
4.7µH
V
OUT
(2.5V/
500mA)
R2
121k
100
V
IN
= 3.3V
95
D1
LTC1701
C1
10µF
+
R3
5.1k
C3
330pF
I
TH
/RUN
GND
V
FB
R1
121k
C2
47µF
EFFICIENCY (%)
+
90
85
80
75
70
1
10
100
LOAD CURRENT (mA)
1000
1701 F01a
C1: TAIYO YUDEN JMK316BJ106ML
C2: SANYO POSCAP 6TPA47M
D1: MBRM120L
L1: SUMIDA CD43-4R7
1701 F01
Figure 1. Step-Down 2.5V/500mA Regulator
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
Efficiency Curve
U
U
1