TC110
PFM/PWM Step-Up DC/DC Controller
Features
General Description
• Assured Start-up at 0.9V
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 50µA, and is reduced to less than
0.5µA 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.
• 50µA (Typ) Supply Current (f
• 300mA Output Current @ V ≥ 2.7V
• 0.5µA Shutdown Mode
• 100kHz and 300kHz Switching Frequency
Options
= 100kHz)
OSC
IN
• Programmable Soft-Start
• 84% Typical Efficiency
• Small Package: 5-Pin SOT-23A
Applications
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).
• Palmtops
• Battery-Operated Systems
• Positive LCD Bias Generators
• Portable Communicators
Functional Block Diagram
Device Selection Table
+
+
Battery
10µF
D1
IN5817
47µH
3V
Output
Voltage
(V)*
Osc.
Freq.
(kHz)
Operating
Temp.
Range
–
Part
Number
V
Package
OUT
Si9410DY
+
47µF
Tantalum
TC110501ECT
TC110331ECT
TC110301ECT
TC110503ECT
TC110333ECT
TC110303ECT
5.0
3.3
3.0
5.0
3.3
3.0
5-Pin SOT-23A 100 -40°C to +85°C
5-Pin SOT-23A 100 -40°C to +85°C
5-Pin SOT-23A 100 -40°C to +85°C
5-Pin SOT-23A 300 -40°C to +85°C
5-Pin SOT-23A 300 -40°C to +85°C
5-Pin SOT-23A 300 -40°C to +85°C
5
4
EXT
GND
TC110
V
V
SHDN/SS
3
OUT
DD
1
2
*Other output voltages are available. Please contact
Microchip Technology Inc. for details.
R
OFF
ON
C
Package Type
*RC Optional
3V to 5V Supply
5-Pin SOT-23A
EXT
5
GND
4
TC110
1
2
3
V
V
SHDN/SS
OUT
DD
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A
2002 Microchip Technology Inc.
DS21355B-page 1