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LTC3409

更新时间： 2023-12-20 18:44:40
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
16页 287K
描述
采用 3mm x 3mm DFN 封装的 600mA 低 VIN 降压型稳压器

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中文翻译

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LTC3409 数据手册

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LTC3409  
600mA Low V Buck  
IN  
Regulator in 3mm × 3mm DFN  
FEATURES  
DESCRIPTION  
TheLTC®3409isahighefficiency,monolithicsynchronous  
buck regulator using a constant frequency, current mode  
architecture. The output voltage is adjusted via an external  
resistor divider.  
■
1.6V to 5.5V Input Voltage Range  
■
Internal Soft-Start  
■
Selectable 1.7MHz or 2.6MHz Constant Frequency  
Operation  
■
Internal Oscillator can be Synchronizable to an  
Fixed switching frequencies of 1.7MHz and 2.6MHz are  
supported. Alternatively, an internal PLL will synchronize  
to an external clock in the frequency range of 1MHz to  
3MHz. This range of switching frequencies allows the  
use of small surface mount inductors and capacitors,  
including ceramics.  
External Clock, 1MHz to 3MHz Range  
■
High Efficiency: Up to 95%  
■
Very Low Quiescent Current: Only 65μA During  
Burst Mode® Operation  
■
600mA Output Current (V = 1.8V, V  
750mA Peak Inductor Current  
No Schottky Diode Required  
Low Dropout Operation: 100% Duty Cycle  
0.613V Reference Voltage  
Stable with Ceramic Capacitors  
Shutdown Mode Draws <1μA Supply Current  
Current Mode Operation for Excellent Line and Load  
Transient Response  
= 1.2V)  
OUT  
IN  
■
■
■
■
■
■
■
Supply current during Burst Mode operation is only  
65μA dropping to <1μA in shutdown. The 1.6V to 5.5V  
input voltage range makes the LTC3409 ideally suited  
for single cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd  
or NiMH battery-powered applications. 100% duty cycle  
capability provides low dropout operation, extending bat-  
tery life in portable systems. Burst Mode operation can be  
user-enabled, increasing efficiency at light loads, further  
extending battery life.  
■
■
Overtemperature Protection  
Available in a Low Profile (0.75mm) 8-Lead  
(3mm × 3mm) DFN Package  
The internal synchronous switch increases efficiency and  
eliminatestheneedforanexternalSchottkydiode.Internal  
soft-startofferscontrolledoutputvoltagerisetimeatstart-  
up without the need for external components.  
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815,  
6498466, 6611131.  
APPLICATIONS  
■
Cellular Phones  
■
Digital Cameras  
■
MP3 Players  
Burst Mode Efficiency, 1.8VOUT  
TYPICAL APPLICATION  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1.0  
2.5V , BURST  
IN  
High Efficiency Step-Down Converter  
0.1  
4.2V , BURST  
IN  
3.6V , BURST  
IN  
LTC3409  
SW  
2.2μH*  
10pF  
V
V
OUT  
1.8V  
IN  
1.8V TO 5.5V  
V
IN  
0.01  
0.001  
0.0001  
4.7μF  
CER  
10μF  
CER  
RUN  
MODE  
V
FB  
POWER LOST  
3.6V , BURST  
255k  
IN  
133k  
SYNC GND  
*SUMIDA CDRH2D18/LD  
3409 TA01  
0.1  
1
10  
100  
1000  
3409 TA01b  
LOAD CURRENT (mA)  
3409fc  
1
1234567...16

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