TCM829ECT713 Datasheet, PDF (1/26 Pages) Microchip Technology – Switched Capacitor Voltage Converters

TCM828/TCM829
Switched Capacitor Voltage Converters
Features
• Charge Pump in 5-Pin SOT-23 Package
• >95% Voltage Conversion Efficiency
• Voltage Inversion and/or Doubling
• Low 50 µA (TCM828) Quiescent Current
• Operates from +1.5V to +5.5V
• Up to 25 mA Output Current
• Only Two External Capacitors Required
Applications
• LCD Panel Bias
• Cellular Phones
• Pagers
• PDAs, Portable Dataloggers
• Battery-Powered Devices
Typical Application Circuit
Voltage Inverter
C⁺
V_IN
C1
C^-
INPUT
GND
OUT
V^-
OUTPUT
C₂
Description
The TCM828/TCM829 devices are CMOS “charge-
pump” voltage converters in ultra-small, 5-Pin SOT-23
packages. They invert and/or double an input voltage
which can range from +1.5V to +5.5V. Conversion
efficiency is typically >95%. Switching frequency is
12 kHz for the TCM828, and 35 kHz for the TCM829.
External component requirement is only two capacitors
(3.3 µF nominal) for standard voltage inverter
applications. With a few additional components, a
positive doubler can also be built. All other circuitry,
including control, oscillator and power MOSFETs, are
integrated on-chip. Supply current is 50 µA (TCM828)
and 115 µA (TCM829).
The TCM828 and TCM829 devices are available in a
5-Pin SOT-23 surface mount package.
Package Type
TCM828/TCM829
SOT-23
OUT 1
5 C⁺
V_{IN 2}
C^- ₃
4 GND
Ordering Information
Part No.
Package
Temperature
Range
TCM828ECT
5-Pin SOT-23 -40°C to +85°C
TCM828VT
5-Pin SOT-23 -40°C to +125°C
TCM829ECT
5-Pin SOT-23 -40°C to +85°C
Note: 5-Pin SOT-23 is equivalent to EIAJ
SC-74A.
© 2010 Microchip Technology Inc.
DS21488B-page 1