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参数资料
| 型号： | LTC3520IUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 24QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.2 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 2MHz |
| 电流 - 输出： | 600mA，1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
LTC3520
Synchronous 1A
Buck-Boost and 600mA
Buck Converters
FEATURES
DESCRIPTION
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Dual High Ef?ciency DC/DC Converters:
Buck-Boost (V OUT : 2.2V to 5.25V, I OUT = 1A at
V OUT = 3.3V, V IN ≥ 3V)
Buck (V OUT : 0.8V to V IN , I OUT = 600mA)
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
Thermal and Overcurrent Protection
<1μA Quiescent Current in Shutdown
24-Lead 4mm × 4mm QFN Package
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 ef?ciency to be optimized while minimizing
the solution footprint. Both converters feature soft-start
and current limit protection. The uncommitted gain block
can be con?gured as an LDO or utilized as a battery-good
comparator.
The buck converter is current mode controlled with internal
synchronous recti?cation to improve ef?ciency. Pin-select-
able Burst Mode operation can be enabled to improve light
load ef?ciency, or the buck converter can be operated in
low noise PWM mode for sensitive applications.
The buck-boost converter provides continuous conduc-
APPLICATIONS
tion operation to maximize ef?ciency and minimize noise.
At light loads, use of Burst Mode operation will improve
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Portable Media Players
ef?ciency.
Digital Cameras
Handheld PCs, PDAs
GPS Receivers
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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
The LTC3520 provides a <1μA shutdown mode and over-
temperature shutdown on both converters. The LTC3520
is available in a low pro?le (0.75mm) 24-lead 4mm ×
4mm QFN package.
3.3V at 500mA, 1.8V at 600mA and 1.5V at 200mA Converter
Ef?ciency vs V IN
V IN
2.2V TO
22μF
4.7μH
100
BUCK-BOOST
SS1
5.5V
V OUT2
1.8V
600mA
10μF
255k
200k
4.7μH
27pF
0.01μF
54.9k
PV IN1 PV IN2 PV IN3 SV IN SW1A
SW1B
SW2 V OUT1
V C1
FB2
FB1
SS2
LTC3520
R T
470pF
0.01μF
V OUT2
15k
56pF
10k
1M
309k
47μF
V OUT1
3.3V
500mA
1A FOR
V IN ≥ 3V
95
90
85
80
I OUT = 150mA
BUCK
I OUT = 250mA
BURST PWM
PWM1
PWM2
SD3
A OUT
33pF
V OUT
1.5V
200mA
75
OFF ON
SD2
SD1
PGND1 SGND PGND2
A IN
100k
110k
4.7μF
70
2.2
2.7
3.2
3.7
V IN (V)
4.2
4.7
5.2
3520 TA01b
3520 TA01
3520fa
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3521 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters |
| LTC3521EFE#PBF | 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3521EFE#TRPBF | 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3521EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters |
| LTC3521EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters |
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