MIC38C45YM Datasheet, PDF (3/11 Pages) Micrel Semiconductor – BiCMOS Current-Mode PWM Controllers

MIC38C42/3/4/5
Pin Configuration
MIC38C4x
COMP 1
8 VREF
FB 2
7 VDD
ISNS 3
6 OUT
RT/CT 4
5 GND
Micrel, Inc.
MI C 3 8 C 4 x - 1
COMP 1
NC 2
FB 3
NC 4
ISNS 5
NC 6
RT/CT 7
14 VREF
13 NC
12 VDD
11 VD
10 OUT
9 AGND
8 PGND
8-Pin DIP (N)
8-Pin SOIC (M)
8-Pin MSOP (MM)
Pin Description
Pin Number Pin Number
N, M, MM -1BN, -1BM
1
1
Pin Name
COMP
2
NC
2
3
FB
4
3
5
NC
ISNS
6
NC
4
7
RT/CT
5
GND
8
PGND
9
AGND
6
10
OUT
11
VD
7
12
VDD
13
NC
8
14
VREF
14-Pin DIP (-1BN)
14-Pin SOIC (-1BM)
Pin Function
Compensation: Connect external compensation network to modify the error
amplifier output.
Not internally connected.
Feedback (Input): Error amplifier input. Feedback is 2.5V at desired output
voltage.
Not internally connected.
Current Sense (Input): Current sense comparator input. Connect to current
sensing resistor or current transformer.
Not internally connected.
Timing Resistor/Timing Capacitor: Connect external RC network to select
switching frequency.
Ground: Combined analog and power ground.
Power Ground: N-channel driver transistor ground.
Analog Ground: Controller circuitry ground.
Power Output: Totem-pole output.
Power Supply (Input): P-channel driver transistor supply input. Return to
power ground (PGND).
Analog Supply (Input): Controller circuitry supply input. Return to analog
ground (AGND).
Not internally connected.
5V Reference (Output): Connect external RC network.
September 2007
3
M9999-091107