mic9131 Micrel Semiconductor, mic9131 Datasheet - Page 2

• Manufacturer Part Number: mic9131
• Description: Mic9131 High-voltage, High-speed Telecom Dc-to-dc Controller
• Manufacturer: Micrel Semiconductor

MIC9131
Ordering Information
Pin Configuration
Pin Description
M9999-080206
Standard
MIC9131BM
MIC9131BQS
Pin Number
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
Part Number
Pb-Free
MIC9131YM
MIC9131YQS
Pin Name
CPWR
RBIAS
COMP
VBIAS
AGND
PGND
SYNC
UVLO
ISNS
LINE
VCC
OSC
OUT
EN
FB
SS
Max. Duty Cycle Junction Temp. Range
75%
75%
COMP
CPWR
RBIAS
SYNC
VCC
OSC
LINE
FB
Pin Function
Line (Input): 180Vdc maximum supply input. May be floated if unused.
Supply (Input): MIC9131 internal supply input.
Bias Resistor (External Component): Connect 562KΩ to ground.
Oscillator RC Network (External Components): Connect external resistor-ca-
pacitor network to set oscillator frequency.
Synchronization (Input): External oscillator input for slave operation of con-
troller. See OSC. Do not float.
Compensation (External Components): Error amplifier output for external
compensation network connection.
Feedback (Input): Error amplifier inverting input.
Current Limit Selection (Input): When CPWR is high, an over-current condi-
tion at the ISNS input will terminate the gate drive and reset the soft-start
latch. If the CPWR pin is low, an over-current condition at the ISNS input
will terminate the gate drive signal, but will not cause a reset of the soft-start
circuit.
Reference (Output): Internal 5V supply. Will source 5mA maximum.
Enable (Input): Logic level enable/shutdown input; logic high = enabled (on),
logic low = shutdown (off).
Analog Ground (Return)
Soft-Start (External Components): Connect external capacitor to slowly ramp
up duty cycle during startup and over-current conditions.
Undervoltage Lockout (External Components): Connect to unbiased resistive
divider network to set controller’s minimum operating voltage. Connect to
VBIAS if not needed.
Current Sense (Input): Connect between external switching MOSFET source
and switch current sense resistor.
Power Ground (Return)
Switch Drive Output (Output): Connect to gate of external switching MOS-
FET.
16-Pin QSOP (QS)
1
2
3
4
5
6
7
8
16-Pin SOP (M)
2
-40°C to +125°C
-40°C to +125°C
16
15
14
13
12
11
10
9 VBIAS
OUT
PGND
ISNS
UVLO
SS
AGND
EN
16-Pin QSOP
16-Pin SOP
Package
August 2006
Micrel, Inc.