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LT1309

更新时间： 2024-11-04 22:55:51
品牌 Logo 应用领域
凌特 - Linear 转换器闪存
页数 文件大小 规格书
8页 240K
描述
500kHz Micropower DC/DC Converter for Flash Memory

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中文翻译

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LT1309 数据手册

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LT1309  
500kHz Micropower  
DC/DC Converter  
for Flash Memory  
U
DESCRIPTIO  
EATURE  
S
F
The LT®1309 is a 500kHz micropower DC/DC converter  
for Flash Memory. The regulator features Burst ModeTM  
operation with a 0.5A, 300mV switch, enabling 85%  
efficiency at the fixed 12V output. High frequency opera-  
tion permits the use of small value, and therefore small  
size,surfacemountinductorsandcapacitors.TheLT1309  
comes in an 8-lead SO package allowing extremely  
compact PC board layouts. These features make the  
device attractive for PCMCIA cards, cellular phones and  
other applications where PC board space is limited.  
■
■
■
■
■
■
■
■
■
60mA Output Current at 12V from 3V or 5V Supply  
Shutdown to 9µA  
VPP VALID Comparator  
Up to 85% Efficiency  
Switching Frequency: 500kHz (Typical)  
Quiescent Current: 650µA  
Low VCESAT Switch: 300mV at 0.5A (Typical)  
Soft Start Reduces Supply Current Transients  
Uses Low Value, Small Size,  
Surface Mount Inductors  
Available in 8-Lead SO Package  
■
Quiescent current is 650µA decreasing to 9µA when the  
part shuts down. The device includes a soft start feature  
which limits supply current transients during turn-on.  
O U  
PPLICATI  
S
A
■
■
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The LT1309 contains a VPP VALID comparator with a  
logic output that goes low when the output voltage is  
ready to program 12V Flash Memory. This comparator  
simplifies the interface to external control logic.  
Flash Memory VPP Generators  
Type II and III PCMCIA Card DC/DC Converters  
3V to 12V, 5V to 12V Converters  
Portable Computers and Instruments  
Cellular Telephones  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
DC/DC Converter Module Replacements  
U
O
TYPICAL APPLICATI  
12V, 60mA Flash Memory Programming Supply  
12V Output Efficiency  
L1*  
10µH  
86  
D1†  
VPP 12V, 60mA  
V
IN  
= 5V  
V
IN  
84  
82  
80  
78  
76  
74  
72  
70  
3.3V TO 5V  
V
V
SW  
IN  
VPP VALID  
ON/OFF  
VPP VALID  
SENSE  
V
= 3.3V  
IN  
LT1309  
SOFT  
START  
GND  
C2  
1µF**  
ON/OFF  
+
R1  
1M  
C3  
C1  
PGND  
0.1µF  
4.7µF  
*MURATA ERIE LQH3C100K0YM00  
**CERAMIC  
LT1309 • TA01  
†MOTOROLA MBR0530  
1
10  
LOAD CURRENT (mA)  
100  
LT1309 • TA02  
1
12345678

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