MIC3808/3809

Micrel

MIC3808/3809

4

April 2005

Electrical Characteristics

Parameter

Condition

Min

Typ

Max

Units

Oscillator Section

Oscillator Frequency

180

200

220

kHz

Oscillator Amplitude/VDD

Note 4

0.44

0.5

0.56

V/V

Error Amp Section

Input Voltage

COMP = 2V

1.95

2

2.05

V

Input Bias Current

–1

1

µA

Open Loop Voltage Gain

(Guaranteed by design)

60

80

dB

COMP Sink Current

FB = 2.2V, COMP = 1V

0.3

2.5

mA

COMP Source Current

FB = 1.3V, COMP = 3V, Note 5

–0.15

–0.5

mA

COMP Clamp Voltage

3.1

3.6

4.0

V

PWM Section

Maximum Duty Cycle

Measured at OUTA or OUTB

48

49

50

%

Minimum Duty Cycle

COMP = 0V

0%

Current Sense Section

Gain

Note 6 (Guaranteed by design)

1.9

2.2

2.5

V/V

Maximum Input Signal

Note 7

0.45

0.5

0.55

V

CS to Output Delay

COMP = 3V, CS from 0 to 600mV

70

200

ns

CS Source Current

–200

nA

CS Sink Current

CS = 0.5V, RC = 5.5V, Note 8

510

mA

Over Current Threshold

0.7

0.75

0.8

V

COMP to CS Offset

CS = 0V

0.35

0.8

1.2

V

Output Section

OUT Low Level

I = 100mA

0.5

1

V

OUT High Level

0.5

1

V

Rise Time

25

60

ns

Fall Time

25

60

ns

Supply Current ........................................................... 20mA

OUTA/OUTB Source Current (peak) .......................... –0.5A

OUTA/OUTB Sink Current (peak) ................................ 1.0A

NOT TO EXCEED 6V

Junction Temperature .............................. –55°C to +150°C

Storage Temperature ............................... –65°C to +150°C

Lead Temperature (soldering, 10 sec.) ................... +300°C

ESD Rating, Note 3 ...................................................... 2kV

Package Thermal Resistance