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参数资料
| 型号： | LTC3521IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC ADJ 20TSSOP |
| 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： | 3 |
| 输出电压： | 0.6 V ~ 5.5 V，1.8 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.1MHz |
| 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： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
LTC3521
1A Buck-Boost DC/DC
and Dual 600mA Buck
DC/DC Converters
Three High Efficiency DC/DC Converters:
1.8V to 5.5V Input Voltage Range
Pin-Selectable Burst Mode ? Operation
30μA Total Quiescent Current in Burst Mode
Independent Power Good Indicator Outputs
Integrated Soft-Start
Thermal and Overcurrent Protection
<2μA Current in Shutdown
Small 4mm × 4mm QFN and Thermally Enhanced
Bar Code Readers
Medical Instruments
Handy Terminals
PDAs, Handheld PCs
GPS Receivers
FEATURES
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Buck-Boost (V OUT : 1.8V to 5.25V, I OUT : 1A)
Dual Buck (V OUT : 0.6V to V IN , I OUT : 600mA)
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Operation
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TSSOP Packages
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U. S. Patents, including 6404251, 6166527.
DESCRIPTION
The LTC ? 3521 combines a 1A buck-boost DC/DC converter
and dual 600mA synchronous buck DC/DC converters. The
1.1MHz switching frequency minimizes the solution foot-
print while maintaining high efficiency. All three converters
feature soft-start and internal compensation to minimize
the solution footprint and simplify the design process.
The buck converters are current mode controlled and
utilize an internal synchronous rectifier to improve ef-
ficiency. The buck converters support 100% duty cycle
operation to extend battery life. If the PWM pin is held
low, the buck converters automatically transition from
Burst Mode operation to PWM mode at high loads. With
the PWM pin held high, the buck converters remain in low
noise, 1.1MHz PWM mode.
The buck-boost converter features continuous conduction
operation to maximize efficiency and minimize noise. At
light loads, the buck-boost converter can be operated in
Burst Mode operation to improve efficiency and reduce
no-load standby current.
The LTC3521 provides a <2μA shutdown mode, over-
temperature shutdown and current limit protection
on all converters. The LTC3521 is available in a 24-pin
0.75mm × 4mm × 4mm QFN package, and a 20-pin ther-
mally enhanced TSSOP package.
+
4.7μF
Li-Ion
PV IN1 V IN PV IN2
V OUT1
V OUT1
(1A, V IN > 3.0V)
221k
ON
PWM
BURST
TYPICALAPPLICATION
V IN
2.4V TO 4.2V
4.7μH 4.7μH
SW1A SW2
SW1B
3.3V FB2
800mA
22μF 1.0M LTC3521
FB1 4.7μH
SHDN1 SW3
OFF SHDN2 FB3
SHDN3 PGOOD1
PWM PGOOD2
PGND1A PGOOD3
PGND1B GND PGND2
3521 TA01a
137k
68.1k
100k
100k
V OUT2
1.8V
10μF 600mA
V OUT3
1.2V
10μF 600mA
100
98
96
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72
70
2.4
Efficiency vs V IN
V OUT1 = 3.3V
I OUT = 500mA
V OUT2 = 1.8V V OUT3 = 1.2V
I OUT = 200mA I OUT = 200mA
3.4 4.4 5.4
1
For more information www.linear.com/LTC3521
V IN (V)
3521 TA01b
3521fb
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相关代理商/技术参数 |
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| LTC3521IUF#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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| LTC3522EUD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Synchronous 400mA Buck-Boost and 200mA Buck Converters |
| LTC3522EUD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
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