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LTC3568

更新时间： 2024-09-13 05:43:55
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
16页 231K
描述
1.8A, 4MHz, Synchronous Step-Down DC/DC Converter

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LTC3568 数据手册

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LTC3568  
1.8A, 4MHz, Synchronous  
Step-Down DC/DC Converter  
FEATURES  
DESCRIPTION  
The LTC®3568 is a constant frequency, synchronous  
step- down DC/DC converter. Intended for medium power  
applications, it operates from a 2.5V to 5.5V input voltage  
range and has a user configurable operating frequency  
up to 4MHz, allowing the use of tiny, low cost capacitors  
and inductors 2mm or less in height. The output voltage  
is adjustable from 0.8V to 5V. Internal sychronous 0.11Ω  
power switches with 2.4A peak current ratings provide  
high efficiency. The LTC3568’s current mode architecture  
and external compensation allow the transient response  
to be optimized over a wide range of loads and output  
capacitors.  
■
Uses Tiny Capacitors and Inductor  
■
High Frequency Operation: Up to 4MHz  
■
Low R  
Internal Switches: 0.110Ω  
DS(ON)  
■
■
■
High Efficiency: Up to 96%  
Stable with Ceramic Capacitors  
Current Mode Operation for Excellent Line  
and Load Transient Response  
Short-Circuit Protected  
Low Dropout Operation: 100% Duty Cycle  
Low Shutdown Current: I ≤ 1μA  
Low Quiescent Current: 60μA  
Output Voltages from 0.8V to 5V  
Selectable Burst Mode® Operation  
Sychronizable to External Clock  
Small 3mm × 3mm, 10-Lead DFN Package  
■
■
■
■
■
■
■
■
Q
The LTC3568 can be configured for automatic power sav-  
ing Burst Mode operation to reduce gate charge losses  
when the load current drops below the level required for  
continuous operation. For reduced noise and RF interfer-  
ence,theSYNC/MODEpincanbeconfiguredtoskippulses  
or provide forced continuous operation.  
APPLICATIONS  
■
Notebook Computers  
■
Digital Cameras  
To further maximize battery life, the P-channel MOSFET  
is turned on continuously in dropout (100% duty cycle)  
with a low quiescent current of 60μA. In shutdown, the  
device draws <1μA.  
■
Cellular Phones  
Handheld Instruments  
Board Mounted Power Supplies  
■
■
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst  
Mode is a registered trademark of Linear Technology Corporation. All other trademarks are  
the property of their respective owners. Protected by U.S. Patents including 5481178,  
6580258, 6304066, 6127815, 6611131.  
TYPICAL APPLICATION  
Efficiency vs Load Current  
V
IN  
2.5V TO 5.5V  
100  
95  
90  
85  
80  
75  
70  
1000  
100  
22μF  
EFFICIENCY  
V
IN  
SYNC/MODE  
PGOOD  
PV  
SV  
IN  
L1  
IN  
2μH  
V
OUT  
SW  
2.5V/1.8A  
LTC3568  
I
22μF + 10μF  
TH  
POWER LOSS  
887k  
SHDN/R  
V
FB  
T
13k  
1000pF  
10  
1
SGND  
PGND  
V
V
O
= 3.3V  
= 2.5V  
= 1MHz  
IN  
OUT  
324k  
412k  
f
Burst Mode  
OPERATION  
NOTE: IN DROPOUT, THE OUTPUT TRACKS  
THE INPUT VOLTAGE  
3568 F01  
1
10  
100  
1000  
10000  
LOAD CURRENT (mA)  
3568 TA01  
Figure 1. Step-Down 1.8A Regulator  
3568f  
1
1234567...16

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