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LTC3520EUF-PBF

更新时间： 2024-10-01 05:43:55
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
24页 367K
描述
Synchronous 1A Buck-Boost and 600mA Buck Converters

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LTC3520EUF-PBF 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.  
■
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  
■
■
■
2.2V to 5.5V Input Voltage Range  
Pin-Selectable Burst Mode® Operation  
Uncommitted Gain Block for LDO Controller,  
Battery Good Indication or Sequencing  
Programmable 100kHz to 2MHz Switching Frequency  
55µA Total Quiescent Current for Both Converters in  
Burst Mode Operation  
■
■
Thebuckconverteriscurrentmodecontrolledwithinternal  
synchronousrectificationtoimproveefficiency.Pin-select-  
ableBurstModeoperationcanbeenabledtoimprovelight  
load efficiency, or the buck converter can be operated in  
low noise PWM mode for sensitive applications.  
■
■
■
Thermal and Overcurrent Protection  
<1µA Quiescent Current in Shutdown  
24-Lead 4mm × 4mm QFN Package  
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  
■
Portable Media Players  
■
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.  
■
Handheld PCs, PDAs  
GPS Receivers  
■
, LT, LTC, LTM 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 V  
IN  
V
IN  
100  
95  
90  
85  
80  
75  
70  
4.7µH  
2.2V TO  
5.5V  
22µF  
PV  
IN1  
PV  
IN2  
PV  
IN3  
SV SW1A  
IN  
BUCK-BOOST  
I = 150mA  
OUT  
V
3.3V  
4.7µH  
OUT1  
SW1B  
V
OUT2  
1.8V  
600mA  
SW2  
V
OUT1  
470pF  
500mA  
1A FOR  
255k  
27pF  
56pF  
10k  
BUCK  
OUT  
10µF  
47µF  
V
C1  
V
IN  
≥ 3V  
1M  
I
= 250mA  
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  
SD1  
A
IN  
2.7  
3.2  
4.2  
(V)  
4.7  
5.2  
2.2  
3.7  
PGND1 SGND PGND2  
V
IN  
3520 TA01  
3520f  
1
1234567...24

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