MIC38C42/3/4/5

Micrel, Inc.

September 2007

5

M9999-091107

Parameter

Test Conditions

Min

Typ

Max

Units

Current Sense

Gain

Notes 2, 3

2.85

3.0

3.15

V/V

MaximumThreshold

0.9

1

1.1

V

PSRR

70

dB

Input Bias Current

–0.1

–2

µA

Delay to Output

120

250

ns

Output

20

Ω

11

Ω

Rise Time

40

80

ns

Fall Time

30

60

ns

Undervoltage Lockout

Start Threshold

MIC38C42/4

13.5

14.5

15.5

V

MIC38C43/5

7.8

8.4

9.0

V

Minimum Operating Voltage

MIC38C42/4

8

9

10

V

MIC38C43/5

7.0

7.6

8.2

V

Pulse Width Modulator

Maximum Duty Cycle

MIC38C42/3

94

96

%

MIC38C44/5

46

50

%

Minimum Duty Cycle

0

%

Total Standby Current

Start-Up Current

50

200

µA

Operating Supply Current

4.0

6.0

mA

30

37

V

Note 1: These parameters, although guaranteed, are not 100% tested in production.

Note 3: Gain defined as:

A =

Note 5: Output frequency equals oscillator frequency for the MIC38C42 and MIC38C43. Output frequency for the MIC38C44, and

MIC38C45 equals one half the oscillator frequency.

Note 6: On 8-pin version, 20V is maximum input on pin 7, as this is also the supply pin for the output stage. On 14-pin version, 40V is

maximum for pin 12 and 20V maximum for pin 11.