MCT7800

MCT7800

4

MOTOROLA

MCT7806B

MCT7806C

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

Dropout Voltage (IO = 1.0 A, TJ = +25°C)

VI – VO

—

2.0

—

—

2.0

—

Vdc

Output Noise Voltage (TA = +25°C)

10 Hz

≤ f ≤ 100 kHz

Vn

—

10

—

—

10

—

µV/VO

Output Resistance f = 1.0 kHz

rO

—

1.3

—

—

1.3

—

m

Ω

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

ISC

—

0.2

—

—

0.2

—

A

Peak Output Current (TJ = +25°C)

Imax

—

2.2

—

—

2.2

—

A

Average Temperature Coefficient of Output Voltage

TCVO

—

– 0.8

—

—

– 0.8

—

mV/

°C

MCT7808B

MCT7808C

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

Output Voltage (TJ = +25°C)

VO

7.7

8.0

8.3

7.7

8.0

8.3

Vdc

Output Voltage (5.0 mA

≤ IO ≤ 1.0 A, PO ≤15 W)

10.5 Vdc

≤ Vin ≤ 23 Vdc

11.5 Vdc

≤ Vin ≤ 23 Vdc

VO

—

7.6

—

8.0

—

8.4

7.6

—

8.0

—

8.4

—

Vdc

Line Regulation, TJ = +25°C (Note 2)

10.5 Vdc

≤ Vin ≤ 25 Vdc

11 Vdc

≤ Vin ≤ 17 Vdc

Regline

—

—

7.0

2.0

160

80

—

—

7.0

2.0

160

80

mV

Load Regulation, TJ = +25°C (Note 2)

5.0 mA

≤ IO ≤ 1.5 A

250 mA

≤ IO ≤ 750 mA

Regload

—

—

2.0

1.5

160

80

—

—

2.0

1.5

160

80

mV

Quiescent Current (TJ = +25°C)

IB

—

5.5

8.0

—

5.5

8.0

mA

Quiescent Current Change

10.5 Vdc

≤ Vin ≤ 25 Vdc

11.5 Vdc

≤ Vin ≤ 25 Vdc

5.0 mA

≤ IO ≤ 1.0 A

∆IB

—

—

—

—

—

—

—

1.0

0.5

—

—

—

—

—

—

1.0

—

0.5

mA

Ripple Rejection

11.5 Vdc

≤ Vin ≤ 21.5 Vdc, f = 120 Hz

RR

—

63

—

—

63

—

dB

Dropout Voltage (IO = 1.0 A, TJ = +25°C)

VI – VO

—

2.0

—

—

2.0

—

Vdc

Output Noise Voltage (TA = +25°C)

10 Hz

≤ f ≤ 100 kHz

Vn

—

10

—

—

10

—

µV/VO

Output Resistance f = 1.0 kHz

rO

—

18

—

—

18

—

m

Ω

Short Circuit Current Limit (TA = +25°C)

Vin = 35 Vdc

ISC

—

0.2

—

—

0.2

—

A

Peak Output Current (TJ = +25°C)

Imax

—

2.2

—

—

2.2

—

A

Average Temperature Coefficient of Output Voltage

TCVO

—

– 0.8

—

—

– 0.8

—

mV/

°C

NOTES:

1. Tlow = 0°C for MCT78XXC

Thigh = +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting

= – 40

°C for MCT78XXB

will reduce the output current to less than 1.0 A at a VI–VO of 15 V or

greater. The MC7800 die will supply more current under the same conditions.

2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.

Pulse testing with low duty cycle is used.