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TC105 Datasheet(PDF) 1 Page - Microchip Technology

No. de pieza TC105
Descripción Electrónicos  PFM/PWM Step-Down DC/DC Controller
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC105 Datasheet(HTML) 1 Page - Microchip Technology

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 2001-2012 Microchip Technology Inc.
DS21349C-page 1
TC105
Features
•57
A (Typ) Supply Current
• 1A Output Current
•0.5
A Shutdown Mode
• 300kHz Switching Frequency for Small Inductor
Size
• Programmable Soft-Start
• 92% Typical Efficiency
• Small Package: 5-Pin SOT-23A
Applications
• Palmtops
• Battery-Operated Systems
• Portable Instruments
• Positive LCD Bias Generators
• Portable Communicators
• Hand-Held Scanners
• 5V to 3V Down Converters
Device Selection Table
*Other
output
voltages
are
available.
Please
contact
Microchip Technology Inc. for details.
Package Type
General Description
The TC105 is a step-down (Buck) switching controller
that furnishes output currents of up to 1A (max) while
delivering a typical efficiency of 92%. The TC105
normally operates in pulse width modulation mode
(PWM), but automatically switches to pulse frequency
modulation (PFM) at low output loads for greater
efficiency. Oscillator frequency is 300kHz, allowing use
of small (22
H) inductors. Supply current draw is only
102
A (max), and is reduced to less than 0.5A when
the SHDN input is brought low. Regulator operation is
suspended during shutdown. The TC105 accepts a
maximum input voltage of 10V.
The TC105 is available in a small 5-Pin SOT-23A
package, occupies minimum board space and is ideal
for a wide range of applications.
Functional Block Diagram
Part
Number
Output
Voltage
(V)*
Package
Osc.
Freq.
(kHz)
Operating
Temp.
Range
TC105503ECT
5.0
5-Pin SOT-23A
300
-40
C to +85C
TC105333ECT
3.3
5-Pin SOT-23A
300
-40
C to +85C
TC105303ECT
3.0
5-Pin SOT-23A
300
-40
C to +85C
TC105
1
23
5
4
VDD
GND
5-Pin SOT-23A
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
VOUT
SHDN
EXT
(From System
Control Logic)
5
4
TC105333ECT
1
3
2
VDD
EXT
GND
VOUT
ON
OFF
SHDN
3.3V
VOUT
L1 22µH (Sumida CD54)
D1
MA737
Si 9430 P
VBATT
6V
NiMH
C1 10µF/16V
RSS 470K
CSS
0.033
µF
C2
47
µF
10V
Tantalum
3.3V Regulated Supply Using 6V
NiMH Battery Pack Input
+
PFM/PWM Step-Down DC/DC Controller


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