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Micrel, Inc.
Pin Configuration
MIC3230/1/2
N/C
1
16 N/C
VIN 1
10 VDD
VIN
1
12 VDD
VIN
2
15 VDD
EN 2
9 DRV
EN
2
11
DRV
EN
3
14 DRV
PWMD 3
8 PGND
PWMD
COMP
3
4
10 PGND
9 OVP
PWMD
COMP
4
5
13 PGND
12 OVP
COMP 4
7 OVP
IADJ
5
8
IS
IADJ
6
11 IS
IADJ 5
6 IS
FS
6
EPAD
7
SYNC/NC
FS
7
10 SYNC/NC
AGND
8
EPAD
9 N/C
12-Pin 3mmx3mmMLF (ML)
10-Pin MSOP (MM)
MIC3232
Pin Description
?
MIC3230, MIC3231
See Product Option Matrix for selection
16-Pin TSSOP (TSE)
MIC3230, MIC3231
See Product Option Matrix for selection
Pin Number
MLF ?
--
1
2
Pin Number
TSSOP
1
2
3
Pin Number
MSOP
--
1
2
Pin Name
NC
VIN
EN
Pin Function
No Connect.
Input Voltage (power) 6V to 45V.
Enable Control (Input). Logic High ( ≥ 1.5V) enables the
regulator. Logic Low ( ≤ 0.4V) shuts down the regulator.
Connect a 100k ? resistor from EN to VIN.
3
4
3
PWMD
PWM Dimming Input. Logic Low will disable the brightness
control of the LED drivers.
4
5
6
5
6
7
4
5
--
COMP
IADJ
FS
Compensation (output): for external compensation.
Feedback (input).
Frequency Select (input). Connected to a Resistor to
determine the operating frequency.
--
--
7
8
9
10
--
--
--
AGND
NC
SYNC
Analog Ground.
No Connect.
Sync (output). Connect to another MIC3230 to synchronize
multiple converters.
8
11
6
IS
Current Sense (input). Connected to external current sense
resistor which in turn is connected to the source of the external
FET as well as an external slope compensation resistor.
9
12
7
OVP
OVP divider connection (output). Connect the top of the
divider string to the output. If the load is disconnected, the
output voltage will rise until OVP reaches 1.25V and then will
regulate around this point.
10
11
12
13
14
15
8
9
10
PGND
DRV
VDD
Power Ground.
Drive Output: connect to the gate of external FET (output).
VDD Filter for internal power rail. Do not connect an external
load to this pin. Connect 10μF to GND.
--
--
March 2011
16
--
--
--
NC
EPAD
3
No Connect.
Connect to AGND.
M9999-030311-D
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