MIC3838/3839

Micrel

MIC3838/3839

4

August 2003

T

Parameter

Condition

Min

Typ

Max

Units

Internal Reference Section

Output voltage

I

2.85

3.0

3.15

V

Line Regulation

MIC3838 9V

≤ V

2

10

mV

MIC3839 5V

≤ V

Load Regulation

I

14

30

mV

Oscillator Section

Oscillator Frequency

180

200

220

kHz

Oscillator Amplitude/V

DD

Note 6

0.44

0.5

0.56

V/V

DD

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 7

–0.15

–0.5

mA

COMP PM Clamp Voltage

V

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

Guaranteed by design, Note 8

1.9

2.2

2.5

V/V

I

Note 9

0.45

0.5

0.55

V

I

COMP = 3V, I

70

200

ns

Ramp or I

–200

nA

Ramp or I

Ramp = I

510

mA

I

0.7

0.75

0.8

V

COMP to Ramp Offset

Ramp = I

0.35

0.8

1.2

V

Output Section

OUT Low Level

I = 100mA

0.5

1

V

OUT High Level

I = –50mA, V

0.5

1

V

Rise Time

C

25

60

ns

Fall Time

C

25

60

ns

Supply Voltage (I

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

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

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

COMP Pin .................................................................... V

DD

Analog Inputs (FB, ILIM, RAMP) ......... –0.3V to V

NOT TO EXCEED 6V

Junction Temperature .............................. –55

°C to +150°C

Storage Temperature (T

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

°C

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

V

Oscillator Frequency (f

Ambient Temperature (T

Package Thermal Resistance

MSOP-10 (

θ