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LTC3520

更新时间： 2024-09-25 14:58:27
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
24页 316K
描述
同步 1A 降压-升压型和 600mA 降压型转换器

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中文翻译

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LTC3520 数据手册

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LTC3520  
Synchronous 1A  
Buck-Boost and 600mA  
Buck Converters  
FEATURES  
DESCRIPTION  
The LTC®3520 combines 1A buck-boost and 600mA  
synchronous buck DC/DC converters in a tiny 4mm ×  
4mm package. A programmable switching frequency  
allows the efficiency to be optimized while minimizing  
the solution footprint. Both converters feature soft-start  
and current limit protection. The uncommitted gain block  
can be configured as an LDO or utilized as a battery-good  
comparator.  
n
Dual High Efficiency DC/DC Converters:  
Buck-Boost (V : 2.2V to 5.25V, I  
= 1A at  
OUT  
IN  
OUT  
V
= 3.3V, V ≥ 3V)  
OUT  
Buck (V : 0.8V to V , I  
= 600mA)  
OUT  
IN OUT  
n
n
n
2.2V to 5.5V Input Voltage Range  
Pin-Selectable Burst Mode® Operation  
Uncommitted Gain Block for LDO Controller, Battery  
Good Indication or Sequencing  
n
n
Programmable 100kHz to 2MHz Switching Frequency  
55μA Total Quiescent Current for Both Converters in  
Burst Mode Operation  
Thermal and Overcurrent Protection  
<1μA Quiescent Current in Shutdown  
24-Lead 4mm × 4mm QFN Package  
Thebuckconverteriscurrentmodecontrolledwithinternal  
synchronousrectificationtoimproveefficiency.Pin-select-  
ableBurstModeoperationcanbeenabledtoimprovelight  
load efficiency, or the buck converter can be operated in  
low noise PWM mode for sensitive applications.  
n
n
n
The buck-boost converter provides continuous conduc-  
tion operation to maximize efficiency and minimize noise.  
At light loads, use of Burst Mode operation will improve  
efficiency.  
APPLICATIONS  
n
Portable Media Players  
n
Digital Cameras  
The LTC3520 provides a <1μA shutdown mode and over-  
temperature shutdown on both converters. The LTC3520  
is available in a low profile (0.75mm) 24-lead 4mm ×  
4mm QFN package.  
n
Handheld PCs, PDAs  
GPS Receivers  
n
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. Protected by U.S. Patents, including 5481178, 6166527, 6304066, 6404251, 6580258.  
TYPICAL APPLICATION  
3.3V at 500mA, 1.8V at 600mA and 1.5V at 200mA Converter  
Efficiency vs VIN  
100  
V
IN  
4.7μH  
BUCK-BOOST  
2.2V TO  
5.5V  
22μF  
PV  
PV  
PV SV SW1A  
IN3 IN  
I
= 150mA  
IN1  
IN2  
OUT  
95  
90  
85  
80  
75  
70  
V
3.3V  
500mA  
1A FOR  
V
4.7μH  
27pF  
OUT1  
SW1B  
V
OUT2  
1.8V  
600mA  
SW2  
V
OUT1  
470pF  
BUCK  
OUT  
255k  
56pF  
10k  
10μF  
47μF  
I
= 250mA  
V
C1  
≥ 3V  
1M  
IN  
FB2  
SS2  
15k  
0.01μF  
200k  
FB1  
SS1  
0.01μF  
309k  
LTC3520  
54.9k  
R
T
V
OUT2  
PWM1  
PWM2  
SD3  
A
OUT  
V
BURST  
PWM  
OUT  
1.5V  
200mA  
33pF  
100k  
110k  
SD2  
OFF ON  
4.7μF  
2.7  
3.2  
4.2  
(V)  
4.7  
5.2  
2.2  
3.7  
SD1  
A
IN  
V
PGND1 SGND PGND2  
IN  
3520 TA01b  
3520 TA01  
3520fa  
1
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中文翻译

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