MIC38C42/3/4/5
Parameter
Current Sense
Gain
MaximumThreshold
PSRR
Input Bias Current
Delay to Output
Output
R
DS(ON)
High
R
DS(ON)
Low
Rise Time
Fall Time
Undervoltage Lockout
Start Threshold
Minimum Operating Voltage
Pulse Width Modulator
Maximum Duty Cycle
Minimum Duty Cycle
Total Standby Current
Start-Up Current
Operating Supply Current
Zener Voltage (V
DD
)
V
DD
= 13V for MIC38C42/44
V
FB
= V
ISNS
= 0V
I
DD
= 25mA,
Note 6
30
50
4.0
37
MIC38C42/3
MIC38C44/5
94
46
96
50
MIC38C42/4
MIC38C43/5
MIC38C42/4
MIC38C43/5
13.5
7.8
8
7.0
14.5
8.4
9
7.6
I
SOURCE
= 200mA
I
SINK
= 200mA
T
A
= 25°C, C
L
= 1nF
T
A
= 25°C, C
L
= 1nF
20
11
40
30
Notes 2, 3
V
COMP
= 5V,
Note 2
12 ≤ V
DD
≤ 18V,
Note 2
2.85
0.9
3.0
1
70
–0.1
120
Test Conditions
Min
Typ
Micrel, Inc.
Max
3.15
1.1
–2
250
Units
V/V
V
dB
µA
ns
Ω
Ω
80
60
15.5
9.0
10
8.2
ns
ns
V
V
V
V
%
%
0
200
6.0
%
µA
mA
V
V
DD
= 7.5V for MIC38C43/45
Note 1:
These parameters, although guaranteed, are not 100% tested in production.
Note 2:
Parameter measured at trip point of latch with V
EA
= 0.
Note 3:
Gain defined as:
∆V
PIN1
; 0 ≤ V
TH
(I
SNS
) ≤ 0.8V
A=
V
TH
(I
SNS
)
Note 4:
Adjust V
DD
above the start threshold before setting at 15V.
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.
July 2005
5
M9999-072805
MICREL [ MICREL SEMICONDUCTOR ]
