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| MC33468 Datasheet, PDF (1/8 Pages) ON Semiconductor – VARIABLE FREQUENCY MICROPOWER DC-to-DC CONVERTER | |||
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Order this document by MC33468/D
Variable Frequency
Micropower Step-up DC-DC
Converter
The MC33468 is a micropower stepâup switching voltage regulator,
specifically designed for handheld and pager applications, to provide a
regulated output voltage using a minimum of external parts. This device
features a quiescent bias current of 3.0 µA typical.
The MC33468 features a highly accurate voltage reference, an error
amplifier, an oscillator, a variable frequency modulation (VFM) controller, a
drive pin (EXT) for an external transistor, and feedback resistors.
The Vout pin is fixed at 2V in the IC. The output of the converter with an
inductor, a diode, a capacitor, a drive transistor, and feedâback resistors can
have an output of 30V.
MC33468 Features:
⢠Low Quiescent Bias Current of 3.0 µA
⢠High Output Voltage Accuracy of ±2.5%
⢠Low Startup Voltage of 0.8 V at No Load
⢠Output Voltage Set With External Resistors
⢠Operating Temperature Range: â40°C to +85°C
⢠Surface Mount Package
ORDERING INFORMATION
Device
Output
Voltage Marking
Reel
Size
Tape
Width Quantity
MC33468SNâ20ATR
2.0
0KXX*
7â
* âXXâ denotes the lot number.
8 mm
3000
PIN DESCRIPTION
Pin No.
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 1
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 2
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 3
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 4
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 5
Symbol
GND
VDD
EXT
NC
VOUT
Description
Ground
Input
External Transistor Drive
No Connection
Voltage Output Pin (Fixed at 2V)
Representative Block Diagram
2
VDD
3
Drive
EXT
5
VOUT
Oscillator
MC33468
VARIABLE FREQUENCY
MICROPOWER DCâtoâDC
CONVERTER
SEMICONDUCTOR
TECHNICAL DATA
5
1
N SUFFIX
PLASTIC PACKAGE
CASE 1212
(SOTâ23â5)
PIN CONNECTIONS
Ground 1
Vdd 2
EXT 3
5 VOUT
4 N/C
(Top View)
Vref
1 Gnd
MOTOROLA ANALOG IC DEVICE DATA
1
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