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TC115501ECT Datasheet

  • TC115501ECT

  • PFM/PWM Step-Up DC/DC Converter

  • 14頁

  • MICROCHIP   MICROCHIP

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M
Features
鈥?High Efficiency at Low Output Load Currents via
PFM Mode
鈥?Assured Start-up at 0.9V
鈥?80 碌A(chǔ) (Typ) Supply Current
鈥?85% Typical Efficiency at 100 mA
鈥?140 mA Typical Output Current @ V
IN
=
2.0V
鈥?Low Power Shutdown Mode
鈥?No External Switching Transistor Needed
鈥?Space-Saving SOT-89 Package
TC115
Package Type
SOT-89-5
PS
5
GND
TC115
NC
1
PS
2
SHDN
3
4
LX
PFM/PWM Step-Up DC/DC Converter
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Pagers
Cellular Phones
Palmtops
1-Cell to 3-Cell Battery Powered Systems
Cameras, Video Recorders
Local +3V to +5V Supplies
General Description
The TC115 is a high-efficiency step-up DC/DC
converter for small, low input voltage or battery-
powered systems. This device has a start-up voltage
of 0.9V and a typical supply current of 80 碌A(chǔ). Phase
compensation and soft-start circuitry are included on-
chip. Unlike conventional 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, while supporting typical output cur-
rents of 140 mA. Supply current is reduced to less than
0.5 碌A(chǔ) (max) when SHDN input is brought low.
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.
Functional Block Diagram
L
1
100 碌H
Sumida
廬
CD-54
+
1.5V
+
C
1
10 碌F
D
1
IN5817 +
C
2
47 碌F
Tantalum
+3V
OUT
PS
5
GND
4
LX
TC115
NC
1
PS
2
SHDN
3
1.5V to +3V, 50 mA Supply
錚?/div>
2003 Microchip Technology Inc.
DS21361C-page 1

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