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LTC3446IDE#TRPBF

更新时间： 2024-02-22 22:54:03
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
20页 276K
描述
LTC3446 - Monolithic Buck Regulator with Dual VLDO Regulators; Package: DFN; Pins: 14; Temperature Range: -40°C to 85°C

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LTC3446IDE#TRPBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：DFN包装说明：HVSON, SOLCC14,.12,20
针数：14Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.16模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：5.5 V最小输入电压：2.7 V
标称输入电压：3.6 VJESD-30 代码：R-PDSO-N14
JESD-609代码：e3长度：4 mm
湿度敏感等级：1功能数量：1
端子数量：14最高工作温度：125 °C
最低工作温度：-40 °C最大输出电流：2 A
封装主体材料：PLASTIC/EPOXY封装代码：HVSON
封装等效代码：SOLCC14,.12,20封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：0.8 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：BUCK最大切换频率：2700 kHz
技术：CMOS温度等级：AUTOMOTIVE
端子面层：Matte Tin (Sn)端子形式：NO LEAD
端子节距：0.5 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30宽度：3 mm
Base Number Matches：1

LTC3446IDE#TRPBF 数据手册

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LTC3446  
Monolithic Buck Regulator  
with Dual VLDO Regulators  
FeaTures  
DescripTion  
The LTC®3446 combines a synchronous buck DC/DC con-  
verter with two very low dropout (VLDO) linear regulators  
to provide up to three stepped-down output voltages from  
a single input voltage. The input voltage range is ideally  
suited for Li-Ion battery-powered applications, as well  
as powering low voltage logic from 5V or 3.3V rails. The  
output voltage range extends down to 0.4V for the VLDO  
regulators and 0.8V for the buck.  
n
High Efficiency Triple Step-Down Outputs from a  
Single Input Supply  
1A Synchronous Buck Regulator Provides Main  
n
Step-Down Output and Powers Two 300mA VLDO™  
Linear Regulators  
n
Output Voltages as Low as 400mV (VLDO Outputs)  
n
Power Good Output  
n
Input Voltage Range: 2.7V to 5.5V  
n
Independent Enable Pin for Each Supply  
The 1A synchronous buck converter provides the main  
output with high efficiency, typically 85%. The two 300mA  
VLDO regulators can run off the main output to provide  
two additional lower voltage outputs. A built-in supply  
monitor provides a power good indication.  
n
Low (140µA Typ) No-Load Quiescent Current with  
All Outputs Enabled  
n
Constant Frequency Current Mode Operation  
n
2.25MHz Switching Frequency Uses Small Inductors  
Defeatable Automatic Burst Mode® Operation for  
n
The buck converter switches at 2.25MHz, allowing the use  
ofsmallsurfacemountinductorsandcapacitors.Constant  
frequency current mode operation produces controlled  
output spectrum and fast transient response. A mode-  
select pin allows automatic Burst Mode operation to be  
enabled for higher efficiency at light load, or disabled for  
lower noise operation down to very light loads. The two  
VLDOregulatorsarestablewithceramicoutputcapacitors  
as small as 1µF.  
High Efficiency at Light Loads  
n
n
n
1.5% Reference Accuracy  
Overtemperature Protection  
Thermally Enhanced 4mm × 3mm 14-Pin DFN  
Package  
applicaTions  
n
Low Power Handheld Devices  
n
Low Voltage and Multivoltage Power for Digital  
L, LT, LTC, LTM and Burst Mode are registered trademarks and VLDO, Hot Swap, PowerPath  
and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents including 5481178, 6611131,  
6304066, 6498466, 6580258.  
Logic, I/O, FPGAs, CPLDs, ASICs and CPUs  
Typical applicaTion  
L1  
1.8µH  
V
OUT  
1.8V  
V
Buck Efficiency vs Buck Load Current  
IN  
V
SW  
IN  
2.9V TO 5.5V  
22µF  
X7R  
22µF  
X7R  
400mA MAX  
59k  
100  
PWM  
MODE  
BUCKFB  
Burst Mode  
OPERATION  
90  
80  
70  
60  
50  
40  
47.5k  
LTC3446  
LV  
IN  
V
OUT  
PGOOD LV  
MODESEL  
ENBUCK  
ENLDO1  
ENLDO2  
1.5V  
OUT1  
2.2µF  
X7R  
300mA MAX  
DIGITAL  
110k  
CONTROL  
LV  
FB1  
40.2k  
3.3k  
V
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
OUT  
IN  
IN  
IN  
I
LV  
OUT2  
1.2V  
TH  
2.2µF  
X7R  
300mA MAX  
1000pF  
80.6k  
40.2k  
LV  
1
10  
100  
1000  
FB2  
LOAD CURRENT (mA)  
GND  
3446 TA01  
3446 TA01b  
L1: TOKO A960AW-1R8M  
3446ff  
1
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