MC33063A, MC34063A
1.5 A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
SLLS636D – DECEMBER 2004 – REVISED MARCH 2005
TYPICAL CHARACTERISTICS
1000
VCE(SAT), Output Switch
Saturation Voltage (V)
VCC = 5 V
Pin 7 = VCC
Pin 5 = GND
TA = 25°C
tON
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
1
0
0.0
0.2
0.4
0.6
0.8
1
1.0
1.2
1.4
1.6
VCC = 5 V
Pin 1, 7, 8 = VCC
Pin 3, 5 = GND
TA = 25°C
tON-OFF, Output Switch
On-Off Time (µs)
100
tOFF
10
1
0.01
0.1
1
CT, Oscillator Timing Capacitor (nF)
10
IE, Emitter Current (A)
Figure 1. Output Switch On-Off Time vs
Oscillator Timing Capacitor
Figure 2. Output Switch Saturation Voltage vs
Emitter Current (Emitter-Follower Configuration)
1.4
VCE(SAT), Output Switch
Saturation Voltage (V)
1.2
Darlington Connection
380
360
340
VIPK, Current Limit
Sense Voltage (mV)
VCC = 5 V
ICHG=
I
DISCHG
1.0
0.8
0.6
0.4
0.2
0.0
0
0.0
0
0.2
VCC = 5 V
Pin 7 = VCC
Pin 2, 3, 5 = GND
TA = 25°C
Force Beta = 20
320
300
280
260
240
220
200
−50
−25
0
25
50
75
100
TA, Ambient Temperature (°C)
125
0.4 0.6 0.8 1.0 1.2
1
IC, Collector Current (A)
1.4
1.6
Figure 3. Output Switch Saturation Voltage vs
Collector Current (Common-Emitter Configuration)
Figure 4. Current-Limit Sense Voltage vs
Temperature
3.6
ICC, Supply Current (mA)
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0.0
0
5
10
15
20
25
30
VCC, Supply Voltage (V)
35
40
CT = 1 nF
Pin 7 = VCC
Pin 2 = GND
TA = 25°C
Figure 5. Standby Supply Current vs
Supply Voltage
4
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