MIC38C45YM Micrel Inc, MIC38C45YM Datasheet - Page 3

• Manufacturer Part Number: MIC38C45YM
• Description: Monolithic SMPS Controller ( )
• Manufacturer: Micrel Inc

Specifications of MIC38C45YM

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 50%
• Voltage - Supply: 7.6 V ~ 20 V
• Buck: Yes
• Boost: Yes
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 500kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1777-5; MIC38C45YM

MIC38C42/3/4/5
Pin Configuration
Pin Description
September 2007
Pin Number
N, M, MM
1
2
3
4
5
6
7
8
C O M P
R T / C T
I S N S
F B
Pin Number
-1BN, -1BM
1
2
3
4
8-Pin MSOP (MM)
10
12
13
14
11
1
2
3
4
5
6
7
8
9
8-Pin SOIC (M)
8-Pin DIP (N)
MIC38C4x
Pin Name
8
7
6
5
COMP
RT/CT
PGND
AGND
VREF
ISNS
GND
OUT
VDD
NC
NC
NC
VD
NC
FB
V R E F
VDD
OUT
GND
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.
3
14-Pin SOIC (-1BM)
14-Pin DIP (-1BN)
M9999-091107
Micrel, Inc.