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TCM829ECT Datasheet

  • TCM829ECT

  • Switched Capacitor Voltage Converters

  • 9頁(yè)

  • MICROCHIP   MICROCHIP

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TCM828
TCM829
Switched Capacitor Voltage Converters
FEATURES
s
s
s
s
s
s
s
Charge Pump in 5-Pin SOT-23A Package
>95% Voltage Conversion Efficiency
Voltage Inversion and/or Doubling
Low 50
碌
A (TCM828) Quiescent Current
Operates from +1.5V to +5.5V
Up to 25mA Output Current
Only Two External Capacitors Required
GENERAL DESCRIPTION
The TCM828/829 are CMOS 鈥渃harge-pump鈥?voltage
converters in ultra-small 5-Pin SOT-23A 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 12kHz for the TCM828 and 35kHz for
the TCM829.
External component requirement is only two capacitors
(3.3碌F nominal) for standard voltage inverter applications.
With a few additional components a positive doubler can
also be built. All other circuitry, including control, oscillator,
power MOSFETs are integrated on-chip. Supply current
is 50碌A(chǔ) (TCM828) and 115碌A(chǔ) (TCM829).
The TCM828 and TCM829 are available in a 5-Pin
SOT-23A surface mount package.
APPLICATIONS
s
s
s
s
s
LCD Panel Bias
Cellular Phones
Pagers
PDAs, Portable Dataloggers
Battery-Powered Devices
PIN CONFIGURATION
*5-Pin SOT-23A
ORDERING INFORMATION
Part No.
Package
5-Pin SOT-23A
5-Pin SOT-23A
Temp. Range
鈥?40擄C to +85擄C
鈥?40擄C to +85擄C
OUT
1
5
C+
TCM828ECT
TCM829ECT
NOTE: 5-Pin SOT-23A is equivalent to EIAJ SC-74A.
VIN
2
TCM828ECT
TCM829ECT
C鈥?/div>
3
4
GND
NOTE: *5-Pin SOT-23A is equivalent to EIAJ SC-74A
TYPICAL OPERATING CIRCUIT
Voltage Inverter
C
+
C
1
C
鈥?/div>
TCM828
TCM829
OUT
GND
C
2
V
鈥?/div>
OUTPUT
V
IN
INPUT
漏 2001 Microchip Technology Inc.
DS21488A
TCM828/829-4 5/22/00

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