MC33063A, MC34063A
1.5 A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
SLLS636D – DECEMBER 2004 – REVISED MARCH 2005
TYPICAL CHARACTERISTICS
R*
8
1
Vout
8
1
Vout
7
2
RSC
7
2
RSC
Vin
6
Vin
6
*R
"
0 for constant Vin
2a. External npn Switch
2b. External pnp Saturated Switch (see Note 5)
NOTE A: If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤300 mA) and high driver currents
(≥30 mA), it may take up to 2
µs
to come out of saturation. This condition will shorten the off time at frequencies
≥30
kHz and is magnified
at high temperatures. This condition does not occur with a Darlington configuration because the output switch cannot saturate. If a
non-Darlington configuration is used, the output drive configuration in Figure 2b is recommended.
Figure 7. External Current-Boost Connections for I
C
Peak Greater Than 1.5 A
6
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