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LT3990 参数 Datasheet PDF下载

LT3990图片预览
型号: LT3990
PDF下载: 下载PDF文件 查看货源
内容描述: 高效率, 65V, 500mA同步降压转换器 [High Efficiency, 65V 500mA Synchronous Step-Down Converter]
分类和应用: 转换器
文件页数/大小: 26 页 / 260 K
品牌: LINEAR [ LINEAR INTEGRATED SYSTEMS ]
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LTC3630
High Efficiency, 65V
500mA Synchronous
Step-Down Converter
FEATURES
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DESCRIPTION
The LTC
®
3630 is a high efficiency step-down DC/DC
converter with internal high side and synchronous power
switches that draws only 12μA typical DC supply current
while maintaining a regulated output voltage at no load.
The LTC3630 can supply up to 500mA load current and
features a programmable peak current limit that provides
a simple method for optimizing efficiency and for reduc-
ing output ripple and component size. The LTC3630’s
combination of Burst Mode
®
operation, integrated power
switches, low quiescent current, and programmable peak
current limit provides high efficiency over a broad range
of load currents.
With its wide input range of 4V to 65V, the LTC3630 is a
robust converter suited for regulating a wide variety of
power sources. Additionally, the LTC3630 includes a precise
run threshold and soft-start feature to guarantee that the
power system start-up is well-controlled in any environ-
ment. A feedback comparator output enables multiple
LTC3630s to be paralleled in higher current applications.
The LTC3630 is available in the thermally-enhanced
3mm
×
5mm DFN and the MSE16 packages.
L,
LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Wide Operating Input Voltage Range: 4V to 65V
Synchronous Operation for Highest Efficiency
Internal High Side and Low Side Power MOSFETs
No Compensation Required
Adjustable 50mA to 500mA Maximum Output Current
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 12μA
Wide Output Range: 0.8V to V
IN
0.8V ±1% Feedback Voltage Reference
Precise RUN Pin Threshold
Internal and External Soft-Start
Programmable 1.8V, 3.3V, 5V or Adjustable Output
Few External Components Required
Low Profile (0.75mm) 3mm
×
5mm DFN and
Thermally-Enhanced MSE16 Packages
APPLICATIONS
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Industrial Control Supplies
Medical Devices
Distributed Power Systems
Portable Instruments
Battery-Operated Devices
Automotive
Avionics
TYPICAL APPLICATION
100
Efficiency vs Load Current
V
OUT
= 3.3V
V
IN
= 12V
4V to 65V Input to 3.3V Output, 500mA Step-Down Converter
EFFICIENCY (%)
V
IN
4V TO 65V
47μH
V
IN
2.2μF
SW
LTC3630
RUN
V
FB
SS
V
PRG1
V
PRG2
FBO
I
SET
GND
V
OUT
3.3V
100μF 500mA
2
90
80
70
60
50
V
IN
= 65V
3630 TA01a
40
30
0.1
I
SET
= 220kΩ||220pF
I
SET
= OPEN
1
10
100
LOAD CURRENT (mA)
1000
3630 TA01b
3630fb
1