TC110| Datasheet

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TC110
PFM/PWM Step-Up DC/DC Controller
Features
Assured Start-up at 0.9V 50uA (Typ) Supply Current (fOSC = 100kHz) 300mA Output Current @ VIN 2.7V 0.5uA Shutdown Mode 100kHz and 300kHz Switching Frequency Options Programmable Soft-Start 84% Typical Efficiency 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 50uA, and is reduced to less than 0.5uA 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
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 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C -40 C to +85 C

Battery 3V

10uF

+ 47uH D1 IN5817 VOUT Si9410DY 47uF Tantalum

+

5 EXT

4 GND

TC110
VOUT 1 VDD 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 VOUT 2 3

VDD SHDN/SS

NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A

2002 Microchip Technology Inc.

DS21355B-page 1

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TC110 DATASHEET