MC34063A MC33063A NCV33063A 1.5 A Step−Up/Down/ Inverting Switching Regulators

I
MC34063A, MC33063A, NCV33063A
, OUTPUT SWITCH ON-OFF TIME ( s)
t on−off μ
1000
500
200
100
50
20
10
5.0
2.0
1.0
V CC = 5.0 V
Pin 7 = V CC
Pin 5 = GND
T A = 25°C
0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10
C T , OSCILLATOR TIMING CAPACITOR (nF)
t on
t off
, OSCILLATOR VOLTAGE (V)
OSC
V
V CC = 5.0 V
Pin 7 = V CC
Pin 2 = GND
Pins 1, 5, 8 = Open
C T = 1.0 nF
T A = 25°C
10 s/DIV
200 mV/DIV
Figure 2. Output Switch On−Off Time versus
Oscillator Timing Capacitor
Figure 3. Timing Capacitor Waveform
, SATURATION VOLTAGE (V)
CE(sat)
V
1.8
1.7
1.6
1.5
1.4
1.3
V CC = 5.0 V
1.2
Pins 1, 7, 8 = V CC
Pins 3, 5 = GND
1.1
T A = 25°C
(See Note 7)
1.0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
I E , EMITTER CURRENT (A)
CE(sat), SATURATION VOLTAGE (V)
V
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V CC = 5.0 V
Pin 7 = V CC
Pins 2, 3, 5 = GND
T A = 25°C
(See Note 7)
Darlington Connection
Forced = 20
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
I C , COLLECTOR CURRENT(A)
Figure 4. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
Figure 5. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
, CURRENT LIMIT SENSE VOLTAGE (V)
IPK(sense)
V
400
380
3.2
V CC = 5.0 V
360 I chg = I dischg
2.8
340
2.4
320
2.0
300
280
1.6
260
1.2
C T = 1.0 nF
240
0.8
Pin 7 = V CC
Pin 2 = GND
220
0.4
200
0
−55 −25 0 25 50 75 100 125
0 5.0 10 15 20 25 30 35 40
T A , AMBIENT TEMPERATURE (°C)
V CC , SUPPLY VOLTAGE (V)
CC, SUPPLY CURRENT (mA)
3.6
Figure 6. Current Limit Sense Voltage
versus Temperature
Figure 7. Standby Supply Current versus
Supply Voltage
7. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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