TC115 データシートの表示（PDF） - Microchip Technology
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TC115 Datasheet PDF : 14 Pages
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TC115
PFM/PWM Step-Up DC/DC Converter
Features
• High Efficiency at Low Output Load Currents via
PFM Mode
• Assured Start-up at 0.9V
• 80µA (Typ) Supply Current
• 85% Typical Efficiency at 100mA
• 140mA 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
Device Selection Table
Part
Number
Output
Osc.
Voltage Package Freq.
(V)*
(kHz)
Operating
Temp.
Range
TC115501ECT 5.0 SOT-89-5 100 -40°C to +85°C
TC115331ECT 3.3 SOT-89-5 100 -40°C to +85°C
TC115301ECT 3.0 SOT-89-5 100 -40°C to +85°C
*Other output voltages are available. Please contact
Microchip Technology for details.
Package Type
SOT-89-5
5
GND
NC
1
4
LX
TC115
PS SHDN
2
3
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 80µA. 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, and supports typical output
currents of 140mA. Supply current is reduced to less
than 0.5µA, 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
+
1.5V –
+
C1
10µF
L1
100µH
Sumida
CD-54
5
GND
D1
IN5817 +
C2
4
47µF
Tantalum
LX
+3V
OUT
TC115
NC
PS SHDN
1
2
3
1.5V to +3V, 50mA Supply
© 2002 Microchip Technology Inc.
DS21361B-page 1
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