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参数资料
| 型号： | LTC3521IUF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24 |
| 文件页数： | 1/22页 |
| 文件大小： | 1476K |
| 代理商： | LTC3521IUF#PBF |
LTC3521
1
3521fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1A Buck-Boost DC/DC
and Dual 600mA Buck
DC/DC Converters
TheLTC3521combinesa1Abuck-boostDC/DCconverter
anddual600mAsynchronousbuckDC/DCconverters.The
1.1MHz switching frequency minimizes the solution foot-
printwhilemaintaininghighefficiency.Allthreeconverters
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.
Thebuck-boostconverterfeaturescontinuousconduction
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.
n
Three High Efficiency DC/DC Converters:
Buck-Boost (VOUT: 1.8V to 5.25V, IOUT: 1A)
Dual Buck (VOUT: 0.6V to VIN, IOUT: 600mA)
n
1.8V to 5.5V Input Voltage Range
n
Pin-Selectable Burst Mode Operation
n
30A Total Quiescent Current in Burst Mode
Operation
n
Independent Power Good Indicator Outputs
n
Integrated Soft-Start
n
Thermal and Overcurrent Protection
n
<2A Current in Shutdown
n
Small 4mm × 4mm QFN and Thermally Enhanced
TSSOP Packages
n
Bar Code Readers
n
Medical Instruments
n
Handy Terminals
n
PDAs, Handheld PCs
n
GPS Receivers
+
PVIN1
PVIN2
SW2
SW3
FB2
FB3
VOUT1
LTC3521
SHDN2
SHDN1
1.0M
137k
68.1k
22F
10F
VIN
4.7F
Li-Ion
4.7H
VOUT1
3.3V
800mA
(1A, VIN > 3.0V)
VOUT2
1.8V
600mA
100k
10F
4.7H
VOUT3
1.2V
600mA
VIN
2.4V TO 4.2V
221k
3521 TA01a
SHDN3
PWM
SW1A
SW1B
FB1
PGOOD2
PGOOD1
PGOOD3
PGND1A
PGND2
GND
PGND1B
ON
OFF
PWM
BURST
VIN (V)
2.4
EFFICIENCY
(%)
92
94
96
98
5.4
3521 TA01b
88
90
86
84
82
80
76
78
74
72
70
3.4
4.4
100
VOUT1 = 3.3V
IOUT = 500mA
VOUT2 = 1.8V
IOUT = 200mA
VOUT3 = 1.2V
IOUT = 200mA
Efficiency vs VIN
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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3522 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Synchronous 400mA Buck-Boost and 200mA Buck Converters |
| 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 |
| LTC3522EUD#TRPBF | 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:- 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 |
| LTC3523 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Synchronous 600mA Step-Up and 400mA Step-Down DC/DC Converters |
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