mic3808 Micrel Semiconductor, mic3808 Datasheet - Page 5

• Manufacturer Part Number: mic3808
• Description: Mic3808/mic3809 Push-pull Pwm Controller
• Manufacturer: Micrel Semiconductor

Parameter
Undervoltage Lockout Section
Start Threshold
Minimum Operating Voltage
After Start
Hysteresis
Soft Start Section
COMP Rise Time
Overall Section
Startup Current
Operating Supply Current
VDD Zener Shunt Voltage
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
Note 9.
Note 10. Does not include current in the external oscillator network.
Note 11. Maximum operating voltage is equal to the V
Note 12. Start threshold and Zener Shunt threshold track one another.
April 2005
MIC3808/3809
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Measured at RC. Signal amplitude tracks V
The COMP pin is internally clamped to 3.65V(typ). The COMP pin source current is tested at V
voltage. The minimum source current increases as V
Gain is defined by A =
Parameter measured at trip point of latch with FB at 0V.
The internal current sink on the CS pin is designed to discharge an external filter capacitor. It is not intended to be a DC sink path.
For MIC3808, set V
the V
DD
pin current to less than the 20mA V
DD
above the start threshold before setting at 10V.
∆
V
∆
COMP
V
CS
Condition
MIC3808, Note 9
MIC3809
MIC3808
MIC3809
MIC3808
MIC3809
FB = 1.8V, Rise from 0.5V to 3V
V
FB = 0V, CS = 0V, Notes 9 and 10
I
DD
DD
= 10mA, Note 12
, 0 ≤ V
< Start Threshold
CS
DD
DD
DD
≤ 0.4V.
.
maximum supply current rating.
[zener] shunt voltage. When operating at or near the shunt voltage, care must be taken to limit
COMP
approaches V
5
CLAMP
.
COMP
= 3.0V to avoid interfering with this clamp
11.5
Min
4.1
7.6
3.9
3.5
0.1
13
12.5
Typ
130
8.3
4.3
4.1
4.2
0.2
2.5
14
1
MIC3808/3809
Max
13.5
260
4.5
4.3
5.1
0.3
20
15
9
2
Micrel
Units
mA
ms
µA
V
V
V
V
V
V
V