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TC115331ECT Datasheet(PDF) 1 Page - Microchip Technology

No. de pieza TC115331ECT
Descripción Electrónicos  PFM/PWM Step-Up DC/DC Converter
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC115331ECT Datasheet(HTML) 1 Page - Microchip Technology

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 2003 Microchip Technology Inc.
DS21361C-page 1
M
TC115
Features
• High Efficiency at Low Output Load Currents via
PFM Mode
• Assured Start-up at 0.9V
• 80 µA (Typ) Supply Current
• 85% Typical Efficiency at 100 mA
• 140 mA Typical Output Current @ VIN = 2.0V
• Low Power Shutdown Mode
• No External Switching Transistor Needed
• Space-Saving SOT-89 Package
Applications
• Pagers
• Cellular Phones
• Palmtops
• 1-Cell to 3-Cell Battery Powered Systems
• Cameras, Video Recorders
• Local +3V to +5V Supplies
Package Type
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 µA. 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 µA (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
5
4
TC115
1
3
2
GND
LX
NC
PS
SHDN
SOT-89-5
PS
1.5V
C1
10 µF
L1
100 µH
Sumida® CD-54
1.5V to +3V, 50 mA Supply
5
4
TC115
1
3
2
SHDN
PS
NC
C2
47 µF
Tantalum
IN5817
D1
GND
LX
+3V
OUT
+
+
+
PS
PFM/PWM Step-Up DC/DC Converter


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