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MC33463 Datasheet PDF : 12 Pages
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MC33463
Variable Frequency
Micropower DC-to-DC
Converter
The MC33463 series are micropower step–up switching voltage
regulators, specifically designed for handheld and laptop applications,
to provide regulated output voltages using a minimum of external
parts. A wide choice of output voltages are available. These devices
feature a very low quiescent bias current of 4.0 µA typical.
The MC33463H–XXKT1 series features a highly accurate voltage
reference, an oscillator, a variable frequency modulation (VFM)
controller, a driver transistor (Lx), a comparator and feedback resistive
divider.
The MC33463H–XXLT1 is identical to the MC33463H–XXKT1,
except that a drive pin (EXT) for an external transistor is provided.
Due to the low bias current specifications, these devices are ideally
suited for battery powered computer, consumer, and industrial
equipment where an extension of useful battery life is desirable.
MC33463 Series Features:
• Low Quiescent Bias Current of 4.0 µA
• High Output Voltage Accuracy of ±2.5%
• Low Startup Voltage of 0.9 V at 1.0 mA
• Wide Output Voltage Range of 2.5 V to 7.5 V Available
• High Efficiency of 80% Typical
• Surface Mount Package
MC33463H–XXKT1
Vin
3
Lx
2
VO
VO
Gnd
1
Vin
MC33463H–XXLT1
2
VO
VO
3
EXT
Gnd
1
http://onsemi.com
MARKING
DIAGRAM
xxy
TAB SOT–89
H SUFFIX
1
CASE 1213
zzB
xx = Voltage Option (30, 33, 50)
y = 1 = KT1, 2= LT1
zz = Lot Code
B = Lot
PIN CONNECTIONS
MC33463H–XXKT1
Ground 1
Output 2
Lx 3
(Top View)
Tab
(Tab is connected
to Pin 2)
MC33463H–XXLT1
Ground 1
Output 2
EXT 3
(Top View)
Tab
(Tab is connected
to Pin 2)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
Figure 1. Typical Circuit Configurations for the MC33463H
© Semiconductor Components Industries, LLC, 2001
1
November, 2001 – Rev. 2
Publication Order Number:
MC33463/D
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