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LTC1539_15

更新时间： 2024-09-25 01:19:31
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
32页 351K
描述
Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators

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中文翻译

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LTC1539_15 数据手册

 浏览型号LTC1539_15的Datasheet PDF文件第2页浏览型号LTC1539_15的Datasheet PDF文件第3页浏览型号LTC1539_15的Datasheet PDF文件第4页浏览型号LTC1539_15的Datasheet PDF文件第5页浏览型号LTC1539_15的Datasheet PDF文件第6页浏览型号LTC1539_15的Datasheet PDF文件第7页 
LTC1538-AUX/ LTC1539  
Dua l Hig h Effic ie nc y,  
Lo w No ise , Sync hro no us  
Ste p -Do wn Switc hing Re g ula to rs  
U
FEATURES  
DESCRIPTION  
TheLTC®1538-AUX/LTC1539aredual,synchronous step-  
■
■
■
■
■
■
■
Maintains Constant Frequency at Low Output Currents  
Dual N-Channel MOSFET Synchronous Drive  
Programmable Fixed Frequency (PLL Lockable)  
down switching regulator controllers which drive external  
N-channel power MOSFETs in a phase-lockable fixed  
frequencyarchitecture.TheAdaptivePowerTM outputstage  
selectively drives two N-channel MOSFETs at frequencies  
up to 400kHz while reducing switching losses to maintain  
high efficiencies at low output currents.  
Wide V Range: 3.5V to 36V Operation  
IN  
Ultrahigh Efficiency  
Very Low Dropout Operation: 99% Duty Cycle  
Low Dropout, 0.5A Linear Regulator for VPP  
Generation or Low Noise Audio Supply  
Built-In Power-On Reset Timer  
Programmable Soft Start  
Low-Battery Detector  
Remote Output Voltage Sense  
Foldback Current Limiting (Optional)  
Pin Selectable Output Voltage  
5V Standby Regulator Active in Shutdown: IQ < 200µA  
Output Voltages from 1.19V to 9V  
Available in 28- and 36-Lead SSOP Packages  
An auxiliary 0.5A linear regulator using an external PNP  
pass device provides a low noise, low dropout voltage  
source. A secondary winding feedback control pin (SFB1)  
guarantees regulation regardless of load on the main  
output by forcing continuous operation.  
■
■
■
■
■
■
■
■
■
A 5V/20mA regulator, internal 1.19V reference and an  
uncommitted comparator remain active when both con-  
trollers are shut down. A power-on reset timer (POR) is  
included which generates a signal delayed by 65536/fCLK  
(typ 300ms) after the controller’s output is within 5% of  
the regulated first voltage. Internal resistive dividers pro-  
vide pin selectable output voltages with remote sense  
capability on one of the two outputs.  
U
APPLICATIONS  
■
Notebook and Palmtop Computers, PDAs  
Portable Instruments  
Battery-Operated Devices  
DC Power Distribution Systems  
■
The operating current levels are user-programmable via  
external current sense resistors. Wide input supply range  
allows operation from 3.5V to 30V (36V maximum).  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Adaptive Power is a trademark of Linear Technology Corporation.  
U
5V STANDBY  
TYPICAL APPLICATION  
V
IN  
5.2V TO 28V  
C
IN  
+
+
D
, CMDSH-3  
D , CMDSH-3  
B2  
B1  
4.7µF  
22µF  
35V  
× 4  
16V  
V
PROG1  
V
IN  
INTV  
CC  
BOOST 1  
TGL1  
BOOST 2  
TGL2  
M1  
M4  
L2  
10µH  
TGS1  
TGS2  
M6*  
M3*  
L1  
10µH  
C
0.1µF  
C
, 0.1µF  
B1  
B2  
SW2  
BG2  
SW1  
BG1  
D2  
MBR140T3  
M5  
D1  
LTC1539  
M2  
MBR140T3  
+
SENSE  
2
2
+
1000pF  
SENSE  
1
R
–
SENSE2  
SENSE  
R
0.03Ω  
SENSE1  
0.03Ω  
1000pF  
V
OSENSE2  
–
V
SENSE 1  
V
3.3V  
3.5A  
OUT1  
5V  
OUT2  
I
I
C
C
TH1  
TH2  
C1  
C2  
3.5A  
+
1000pF  
1000pF  
C
220µF  
10V  
RUN/SS1  
C
DSC  
V
SGND PGND RUN/SS2  
OUT1  
PROG2  
+
C
OUT  
R
C
C
SS1  
0.1µF  
C
C
SS2  
0.1µF  
R
C
C2A  
470pF  
C1  
10k  
C1A  
OSC  
56pF  
C2  
10k  
220µF  
10V  
220pF  
1538 F01  
M1, M2, M4, M5: Si4412DY  
M3, M6: IRLML2803  
*NOT REQUIRED FOR LTC1538-AUX BOLD LINES INDICATE HIGH CURRENT PATHS  
Figure 1. High Efficiency Dual 5V/3V Step-Down Converter  
1
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