MC33466

3

MOTOROLA ANALOG IC DEVICE DATA

Characteristic

Symbol

Min

Typ

Max

Unit

OSCILLATOR

Frequency

LX output

EXT output

fosc

40

80

50

100

60

120

kHz

Oscillator Minimum Startup Voltage (IO = 0 mA)

Vstart

–

0.8

0.9

V

Oscillator Minimum Supply Voltage (IO = 0 mA)

VCC

0.7

–

–

V

LX OUTPUT (JT1 SUFFIX)

ON State Sink Current (VLx = 0.4 V)

ILx

mA

30KT1 Suffix

60

–

–

33KT1 Suffix

63

–

–

50KT1 Suffix

80

–

–

VLx Voltage Limit (Note 1)

VLxLim

0.65

0.8

1.0

V

OFF State Leakage Current (VLx = 6.0 V)

ILKG

–

–

0.5

µA

EXT OUTPUT (LT1 SUFFIX)

ON State Source Current (VEXT = VO – 0.4 V)

Isource

mA

30LT1 Suffix

1.5

–

–

33LT1 Suffix

1.575

–

–

50LT1 Suffix

2.0

–

–

OFF State Sink Current (VEXT = 0.4 V)

Isink

mA

30LT1 Suffix

1.5

–

–

33LT1 Suffix

1.575

–

–

50LT1 Suffix

2.0

–

–

TOTAL DEVICE

Maximum Duty Ratio Each Cycle

D

70

80

90

%

Output Voltage

VO

V

30KT1 or 30LT1 Suffix

2.925

3.0

3.075

33KT1 or 33LT1 Suffix

3.218

3.3

3.383

50KT1 or 50LT1 Suffix

4.875

5.0

5.125

Soft–Start Time (Note 2)

Tss

0.5

2.0

–

ms

Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA)

IQ

µA

30JT1 Suffix

–

15

25

33JT1 Suffix

–

17

27

50JT1 Suffix

–

30

45

Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA)

30JT1 Suffix

–

1.2

5.0

33JT1 Suffix

–

1.2

5.0

50JT1 Suffix

–

2.0

5.0

Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA)

IQ

µA

30LT1 Suffix

–

30

50

33LT1 Suffix

–

34.5

56

50LT1 Suffix

–

60

90

Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA)

30LT1 Suffix

–

1.2

5.0

33LT1 Suffix

–

1.2

5.0

50LT1 Suffix

–

2.0

5.0

NOTES: 1. When the Lx switch is turned on, ILx current carried through the RDS(on) of the Lx switch results in VLx. When VLx reaches VLxLim, the Lx switch is

turned off by the Lx switch protection circuit.

2. The soft–start circuit turn–on sequence is as follows:

a) Vin is applied.

b) The internal IC Vref is held at zero for 200 µs. During this time, the error amplifier output voltage ramps up to the positive voltage rail.

c) The internal reference steps up to 0.7 V after 200

µs delay has timed out.

d) The error amplifier output voltage integrates down to its steady state value. As the error amplifier output integrates down, the output Lx pin of EXT

pin pulse width gradually widens to its steady operating value.