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LT3580IDD-PBF 参数 Datasheet PDF下载

LT3580IDD-PBF图片预览
型号: LT3580IDD-PBF
PDF下载: 下载PDF文件 查看货源
内容描述: 升压/负输出DC / DC转换器,具有2A开关,软起动和同步 [Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization]
分类和应用: 转换器开关
文件页数/大小: 28 页 / 458 K
品牌: LINER [ LINEAR TECHNOLOGY ]
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LT3580
Boost/Inverting DC/DC
Converter with 2A Switch,
Soft-Start, and Synchronization
FEATURES
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DESCRIPTION
The LT
®
3580 is a PWM DC/DC converter containing an
internal 2A, 42V switch. The LT3580 can be configured
as either a boost, SEPIC or inverting converter. Capable
of generating 12V at 550mA or –12V at 350mA from a 5V
input, the LT3580 is ideal for many local power supply
designs.
The LT3580 has an adjustable oscillator, set by a resistor
from the RT pin to ground. Additionally, the LT3580 can
be synchronized to an external clock. The free running or
synchronized switching frequency range of the part can
be set between 200kHz and 2.5MHz.
The LT3580 also features innovative
SHDN
pin circuitry
that allows for slowly varying input signals and an adjust-
able undervoltage lockout function.
Additional features such as frequency foldback and soft-
start are integrated. The LT3580 is available in tiny 3mm
×
3mm 8-lead DFN and 8-lead MSOP packages.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
2A Internal Power Switch
Adjustable Switching Frequency
Single Feedback Resistor Sets V
OUT
Synchronizable to External Clock
High Gain
SHDN
Pin Accepts Slowly Varying
Input Signals
Wide Input Voltage Range: 2.5V to 32V
Low V
CESAT
Switch: 300mV at 1.5A (Typical)
Integrated Soft-Start Function
Easily Configurable as a Boost or Inverting Converter
User Configurable Undervoltage Lockout (UVLO)
Tiny 8-Lead 3mm
×
3mm DFN and 8-Lead MSOP
Packages
APPLICATIONS
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VFD Bias Supplies
TFT-LCD Bias Supplies
GPS Receivers
DSL Modems
Local Power Supply
TYPICAL APPLICATION
1.2MHz, 5V to 12V Boost Converter Achieves over 88% Efficiency
V
IN
5V
V
IN
SHDN
LT3580
RT
SYNC
2.2μF
75k
SS
0.1μF
FB
VC
10k
1nF
3580 TA01
Efficiency and Power Loss
95
90
1000
85
POWER LOSS (mW)
EFFICIENCY (%)
80
75
600
70
65
60
200
55
50
0
100
200
300
400
LOAD CURRENT (mA)
500
600
0
400
800
1200
4.2μH
V
OUT
12V
550mA
SW
GND
130k
10μF
3580 TA01b
3580fc
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