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TC110503ECT Datasheet

  • TC110503ECT

  • PFM/PWM Step-Up DC/DC Controller

  • 16頁

  • MICROCHIP   MICROCHIP

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TC110
PFM/PWM Step-Up DC/DC Controller
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Assured Start-up at 0.9V
50碌A(chǔ) (Typ) Supply Current (f
OSC
= 100kHz)
300mA Output Current @ V
IN
鈮?/div>
2.7V
0.5碌A(chǔ) Shutdown Mode
100kHz and 300kHz Switching Frequency
Options
鈥?Programmable Soft-Start
鈥?84% Typical Efficiency
鈥?Small Package: 5-Pin SOT-23A
General Description
The TC110 is a step-up (Boost) switching controller
that furnishes output currents of up to 300mA while
delivering a typical efficiency of 84%. The TC110
normally operates in pulse width modulation mode
(PWM), but automatically switches to pulse frequency
modulation (PFM) at low output loads for greater
efficiency. Supply current draw for the 100kHz version
is typically only 50碌A(chǔ), and is reduced to less than
0.5碌A(chǔ) when the SHDN input is brought low. Regulator
operation is suspended during shutdown. The TC110
accepts input voltages from 2.0V to 10.0V, with a
guaranteed start-up voltage of 0.9V.
The TC110 is available in a small 5-Pin SOT-23A
package, occupies minimum board space and uses
small external components (the 300kHz version allows
for less than 5mm surface-mount magnetics).
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Palmtops
Battery-Operated Systems
Positive LCD Bias Generators
Portable Communicators
Functional Block Diagram
Device Selection Table
Part
Number
TC110501ECT
TC110331ECT
TC110301ECT
TC110503ECT
TC110333ECT
TC110303ECT
+
Output
Voltage
(V)*
5.0
3.3
3.0
5.0
3.3
3.0
Package
5-Pin SOT-23A
5-Pin SOT-23A
5-Pin SOT-23A
5-Pin SOT-23A
5-Pin SOT-23A
5-Pin SOT-23A
Osc.
Freq.
(kHz)
100
100
100
300
300
300
Operating
Temp.
Range
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
Battery
3V
10碌F
鈥?/div>
+
47碌H
D1
IN5817
V
OUT
Si9410DY
47碌F
Tantalum
+
5
EXT
4
GND
TC110
V
OUT
1
V
DD
2
SHDN/SS
3
R
OFF ON
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
C
Package Type
*RC Optional
5-Pin SOT-23A
EXT
5
GND
4
3V to 5V Supply
TC110
1
V
OUT
2
3
V
DD
SHDN/SS
NOTE:
5-Pin SOT-23A is equivalent to the EIAJ SC-74A
2002 Microchip Technology Inc.
DS21355B-page 1
漏

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