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TC1142

EOL

Status: End of Life

Features:

  • Input Range 2.5V to 5.5V Regulated Output Options from –3.0 to –5.0V Output Current 20 mA (max) 200 KHz Internal Oscillator Frequency External Synchronizing Clock Input Logic Level Shutdown ........ 1uA (max) Supply Current
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Device Overview

Summary

The TC1142 generates a regulated negative voltage from –3V to –5V at 20 mA from an input of 2.5V to 5.5V, using only three external capacitors. Other boost/buck switching regulators must use an inductor, which is larger and radiates EMI. An internal voltage comparator inhibits the charge pump when VOUT is more negative than the regulated value (per the ordering option). The values of flying capacitors C1 and C2 are chosen to be less than COUT in order to reduce the ripple generated from regulating VOUT in this manner. The TC1142 also can be used as a –1x buck regulator by omitting C2, and connecting the C2-pin to VOUT. The part goes into shutdown when the CCLK input is driven low. When in shutdown mode, the part draws a maximum of 1 µA. When CCLK is pulled high, the part runs from the internal 200 KHz oscillator. The device may be run with an external clock, provided the frequency is greater than 3 KHz and less than 500 KHz. The TC1142 comes in a space-saving MSOP package.

Additional Features
Input Range 2.5V to 5.5V
Regulated Output Options from –3.0 to –5.0V
Output Current 20 mA (max)
200 KHz Internal Oscillator Frequency
External Synchronizing Clock Input
Logic Level Shutdown ........ 1uA (max) Supply Current
Parametrics
Name
Value
Typical Active Output Current (mA)
20
Output Voltage (V)
-3V to -5V
Typical Quiescent Current (µA)
400
Input Voltage Range (V)
2.5 to 5.5
Operating Temp. Range (°C)
-45 to 85
Device Description
Regulated

Documents

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Data Sheet

11/08/2005
246KB

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