TC110 Datasheet, PDF (1/16 Pages) Microchip Technology – PFM/PWM Step-Up DC/DC Controller

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