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LTC3569

更新时间： 2024-11-02 14:58:27
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
26页 389K
描述
具有一个 1.2A 和两个 600mA 输出及单独可编程基准的三通道降压型稳压器

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LTC3569 数据手册

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LTC3569  
Triple Buck Regulator with  
1.2A and Two 600mA Outputs and  
Individual Programmable References  
FeaTures  
DescripTion  
The LTC®3569 contains three monolithic, synchronous  
step-downDC/DCconverters.Intendedformediumpower  
applications, it operates over a 2.5V to 5.5V input voltage  
range. The operating frequency is adjustable from 1MHz  
to 3MHz, allowing the use of tiny, low cost capacitors and  
inductors. The three output voltages are independently  
programmable by toggling the EN pins up to 15 times,  
loweringthe800mVFBreferencesby25mVpercycle. The  
first buck regulator sources load currents up to 1200mA.  
The other two buck regulators each provide 600mA.  
n
Three Independent Current Mode Buck DC/DC  
Regulators (1.2A and 2 × 600mA)  
n
n
Single Pin Programmable V Servo Voltages from  
FB  
800mV Down to 425mV (in 25mV Steps)  
Pull V High to Make Each 600mA Buck a Slave for  
FB  
Higher Current Operation  
Pulse-Skipping or Burst Mode® Operation  
Programmable Switching Frequency  
(1MHz to 3MHz) or Fixed 2.25MHz  
Synchronizable (1.2MHz to 3MHz)  
n
n
n
n
n
n
n
V Range 2.5V to 5.5V  
IN  
The two 600mA buck regulators can also be configured  
to operate as slave power stages, running in parallel with  
another internal buck regulator to supply higher load  
currents. When operating as parallel, slave output stages,  
discrete external components are shared and available  
output currents sum together.  
All Regulators Internally Compensated  
PGOOD Output Flag  
Quiescent Current <100µA (All Regulators in Burst  
Mode Operation)  
Zero Shutdown Current  
n
n
n
Overtemperature and Short-Circuit Protection  
Tiny 3mm × 3mm, 3mm × 4mm 20-Lead QFN and  
Thermally Enhanced TSSOP FE-16 Packages  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property  
of their respective owners. Protected by U.S. Patents including 5481178, 6127815, 6304066,  
6498466, 6580258, 6611131, 7170195.  
applicaTions  
n
Portable Applications with Multiple Supply Rails  
n
General Purpose Step-Down DC/DC  
n
Dynamic Voltage Scaling Applications  
Typical applicaTion  
V
IN  
2.2µH*  
2.5µH**  
2.5µH**  
OUT1 = 2.5V  
SV  
PV  
SW1  
Efficiency vs Load Current  
IN  
IN  
22µF  
1200mA  
510k  
240k  
20pF  
20pF  
20pF  
10µF  
4.7µF  
4.7µF  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V
= 3V  
IN  
EN1  
EN2  
EN3  
FB1  
LTC3569  
V
= 5V  
IN  
OUT2 = 1.8V  
600mA  
SW2  
FB2  
MODE  
300k  
240k  
R
T
PGOOD  
OUT3 = 1.2V  
600mA  
SW3  
FB3  
Burst Mode OPERATION  
PULSE-SKIPPING  
OUT1 = 2.5V  
150k  
* WURTH 7440430022  
** WURTH 744031002  
0.01  
0.1  
1
10  
(mA)  
100 1000 10000  
300k  
SGND PGND  
I
LOAD  
3569 TA01b  
3569 TA01a  
3569fe  
1
For more information www.linear.com/LTC3569  
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