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LTC3499B_15

更新时间： 2024-10-02 01:18:31
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
16页 251K
描述
750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection

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中文翻译

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LTC3499B_15 数据手册

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LTC3499/LTC3499B  
750mA Synchronous  
Step-Up DC/DC Converters  
with Reverse-Battery Protection  
FEATURES  
DESCRIPTION  
TheLTC®3499/LTC3499Baresynchronous,fixedfrequency  
step-up DC/DC power converters with integrated reverse  
battery protection that protect and disconnect the devices  
and load when the battery polarity is reversed while  
delivering high efficiency in a small (3mm × 3mm) DFN  
package. Trueoutputdisconnecteliminatesinrushcurrent  
and allows zero load current in shutdown.  
n
Reverse-Battery Protection for DC/DC Converter  
and Load  
n
High Efficiency: Up to 94%  
n
Generates 5V at 175mA from a 1.8V Input  
n
Operates from 1.8V to 5.5V Input Supply  
n
2V to 6V Adjustable Output Voltage  
n
Inrush Current Controlled During Start-Up  
n
Output Disconnnect in Shutdown  
The devices feature an input voltage range of 1.8V to 5.5V  
enablingoperationfromtwoalkalineorNiMHbatteries.The  
switching frequency is internally set at 1.2MHz allowing  
the use of tiny surface mount inductors and capacitors.  
A minimal number of external components are required  
to generate output voltages ranging from 2V to 6V. The  
LTC3499 features automatic Burst Mode operation to  
increase efficiency at light loads, while the LTC3499B  
features continuous switching at light loads.  
n
Low Noise 1.2MHz PWM Operation  
n
Tiny External Components  
Automatic Burst Mode® Operation (LTC3499)  
n
n
Continuous Switching at Light Loads (LTC3499B)  
n
Overvoltage Protection  
n
8-Lead (3mm × 3mm × 0.75mm) DFN  
and MSOP Packages  
APPLICATIONS  
The soft-start time is externally programmable through a  
small capacitor. Anti-ring circuitry reduces EMI emissions  
by damping the inductor in discontinuous mode. The de-  
vices feature <1µA shutdown supply current, integrated  
overvoltage protection and are available in both 8-pin  
(3mm × 3mm) DFN and 8-pin MSOP packages.  
n
Medical Equipment  
n
Digital Cameras  
n
MP3 Players  
Handheld Instruments  
n
L, 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.  
TYPICAL APPLICATION  
Two AA Cells to 5V Synchronous Boost Converter  
Battery Current vs VIN  
1.0  
4.7µH  
SHDN = 0V  
V
IN  
1.8V TO 3.2V  
V
= 0V  
OUT  
+
V
IN  
SW  
OUT  
FB  
2.2µF  
0.5  
0
LTC3499  
V
OUT  
V
5V  
ON OFF  
SHDN  
VC  
175mA  
1M  
10µF  
100k  
330pF  
SS  
–0.5  
–1.0  
GND  
324k  
0.01µF  
3499 TA01  
–6  
–4  
–2  
0
2
4
6
V
AND SW VOLTAGE (V)  
IN  
3499 TA01b  
3499fc  
1
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