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TC115331EMTRT PDF预览

TC115331EMTRT

更新时间: 2024-11-24 04:58:59
品牌 Logo 应用领域
美国微芯 - MICROCHIP 开关光电二极管
页数 文件大小 规格书
12页 148K
描述
0.4 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO5, SOT-89, 5 PIN

TC115331EMTRT 数据手册

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TC115  
PFM/PWM Step-up DC/DC Converter  
GENERAL DESCRIPTION  
FEATURES  
The TC115 is a high-efficiency step-up DC/DC con-  
verter for small, low input voltage or battery powered sys-  
tems. This device has a guaranteed start-up voltage of 0.9V  
and a typical supply current of 80 µA. Phase compensation  
and soft-start circuitry are included on-chip. Unlike conven-  
tional PWM step-up converters, the TC115 automatically  
shifts to pulse frequency modulation (PFM) at low loads,  
resulting in reduced supply current and improved efficiency.  
The TC115 requires only an external diode, an inductor,  
and a capacitor, and supports typical output currents of 140  
mA.Supplycurrentisreducedtolessthan0.5µA,maxwhen  
SHDN input is brought low.  
High Efficiency at Low Output Load Currents  
via PFM Mode  
Space-Saving SOT-89 Package  
Guaranteed Start-Up at 0.9V  
80 µA (typ.) Supply Current  
85% (typ.) Efficiency at 100 mA  
140 mA Typical Output Current @ VIN = 2.0V  
Low Power Shutdown Mode  
No External Switching Transistor Needed  
TYPICAL APPLICATIONS  
Pagers  
Cellular Phones  
Palmtops  
1-Cell to 3-Cell Battery Powered Systems  
Cameras, Video Recorders  
Local +3V to +5V Supplies  
Small size, low installed cost, and low supply current  
make the TC115 step-up converter ideal for use in a wide  
range of battery powered systems.  
ORDERING INFORMATION  
Output  
Voltage*  
(V)  
Osc. Operating  
TYPICAL OPERATING CIRCUITS  
Part  
Number  
Freq.  
Temp.  
Range  
L1  
Package (KHz)  
100 µH  
Sumida  
CD-54  
D1  
TC115501EMT 5.0 SOT-89-5 100 – 40 to +85°C  
TC115331EMT 3.3 SOT89-5 100 – 40 to +85°C  
TC115301EMT 3.0 SOT-89-5 100 – 40 to +85°C  
+3V  
OUT  
IN5817  
C1  
10 µF  
1.5V  
C2  
47 µF  
5
4
NOTE: *Other output voltages available. Please contact Microchip  
Tantalum  
Technology Inc. for details.  
GND  
LX  
TC115  
PS  
SHDN  
3
NC  
1
2
1.5V to +3V, 50 mA Supply  
© 2001 Microchip Technology Inc. DS21361A  
TC115-1 4/26/99  

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