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LTC3446

更新时间： 2024-09-24 05:43:51
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
20页 251K
描述
Monolithic Buck Regulator with Dual VLDO Regulators

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中文翻译

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LTC3446 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  
Input Voltage Range: 2.7V to 5.5V  
n
n
Independent Internal Soft-Start 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
Independent Enable Pin for Each Supply  
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  
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.  
Defeatable Automatic Burst Mode® Operation for  
n
High Efficiency at Light Loads  
n
1.5% Reference Accuracy  
n
Overtemperature Protection  
n
Thermally Enhanced 4mm × 3mm 14-Pin DFN  
Package  
APPLICATIONS  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
VLDO is a trademark 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.  
n
Low Power Handheld Devices  
n
Low Voltage and Multivoltage Power for Digital  
Logic, I/O, FPGAs, CPLDs, ASICs and CPUs  
TYPICAL APPLICATION  
L1  
1.8μH  
V
OUT  
Buck Efficiency vs Buck Load Current  
V
IN  
2.9V TO 5.5V  
V
SW  
1.8V  
IN  
22μF  
X7R  
22μF  
X7R  
400mA MAX  
100  
59k  
PWM  
MODE  
Burst Mode  
OPERATION  
BUCKFB  
90  
80  
70  
60  
50  
40  
47.5k  
LTC3446  
LV  
IN  
V
1.5V  
300mA MAX  
OUT  
PGOOD LV  
MODESEL  
ENBUCK  
ENLDO1  
ENLDO2  
OUT1  
2.2μF  
X7R  
DIGITAL  
110k  
CONTROL  
1000pF  
LV  
FB1  
40.2k  
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
IN  
IN  
IN  
3.3k  
V
OUT  
1.2V  
300mA MAX  
I
TH  
LV  
OUT2  
2.2μF  
X7R  
80.6k  
40.2k  
1
10  
100  
1000  
LV  
FB2  
LOAD CURRENT (mA)  
GND  
3446 TA01b  
L1: TOKO A960AW-1R8M  
3446 TA01  
3446fd  
1
1234567...20

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