MIC3838BMM Micrel Inc, MIC3838BMM Datasheet - Page 5

• Manufacturer Part Number: MIC3838BMM
• Description: IC CTRLR DC/DC PUSH-PULL 10-MSOP
• Manufacturer: Micrel Inc

Specifications of MIC3838BMM

• Pwm Type: Voltage/Current Mode
• Number Of Outputs: 1
• Frequency - Max: 1MHz
• Duty Cycle: 50%
• Voltage - Supply: 2 V ~ 14 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Frequency-max: 1MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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
V
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
Note 9.
Note 10. The internal current sink on the Ramp and I
Note 11. For MIC3838, set V
Note 12. Does not include current in the external oscillator network.
Note 13. Start threshold and Zener Shunt threshold track one another.
April 2005
MIC3838/3839
DD
Zener Shunt Voltage
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.
Maximum operating voltage is equal to the V
the V
Specification for packaged product only.
Measured at RC.
COMP pin is internally clamped to 3.65V(typ.). COMP pin source current is measured at V
Minimum source current is higher as V
Gain is defined by A =
Parameter measured at trip point of latch with FB at 0V
path. Internal discharge FET should be able to discharge the Volt-Sec clamp and feed-forward circuits in the figure below within 50ns.
DD
pin current less than the 20mA V
DD
above the start threshold before setting at 10V.
∆
V
∆
COMP
V
CS
Condition
MIC3838, Note 11
MIC3839
MIC3838
MIC3839
MIC3838
MIC3839
FB = 1.8V, Rise from 0.5V to 3V
V
FB = 0V, Ramp = I
I
DD
DD
, 0 ≤ V
= 10mA, Note 13
< Start Threshold (MIC3839)
COMP
CS
DD
LIM
≤ 0.4V.
maximum current rating.
DD
approaches V
pin are designed to discharge an external filter capacitor. It is not intended to be a DC sink
(zener) shunt voltage. When operating at or near the shunt voltage, care must be taken to limit
LIM
= 0V, Notes 11, 12
CLAMP
.
5
COMP
= 3.0V to avoid interferring with 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
1.5
14
MIC3838/3839
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