8

Date: 1/11/05

SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator

© Copyright 2005 Sipex Corporation

Figure 6. Common Emitter Configuration Output Switch

Saturation vs. Collector Current

Figure 1. Output Switch On-Off Time vs. Oscillator

Timing Capacitor

Figure 2. Timing Capacitor Waveform

Figure 3. Osillator Frequency vs. Timing Capacitor

TYPICAL PERFORMANCE CHARACTERISTICS

1.37

1.38

1.39

1.4

1.41

1.42

1.43

1.44

1.45

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

Emitter Current (A)

PINS 3,5 = GND

0

0.2

0.4

0.6

0.8

1

1.2

0

0.2 0.4 0.6 0.8

1

1.2 1.4 1.6

Collector Current (A)

Darlington

Forced Beta = 20

PINS 7 = V

CC

PINS 2,3,5 = GND

250

255

260

265

270

275

280

285

290

295

300

-50

0

50

100

150

Temperature

0

0.5

1

1.5

2

2.5

3

3.5

05

10

15

20

25

30

35

40

Vcc Supply Voltage (V)

C

PINS 7 = V

CC

PINS 2 = GND

Figure 7. Current Limit Sense Voltage vs. Tempera-

ture

Figure 4. Standard Supply Current vs. Supply Voltage

1

10

100

1000

10000

0.1

1

10

100

Oscillator Timing Capacitor (nF)

toff

ton

V

PINS 7 = V

CC

PINS 5 = GND

T

0.1

1

10

100

1000

0.1

1

10

100

CT, Oscillator Timing Capacitor (nF)

V

CC

= 5V

Pin7 = VCC

Pin5 = GND

T

A

=25ºC

Figure 5. Emitter Follower Configuration Output

Switch Saturation vs. Emitter Current