MIC9131YQS View Datasheet(PDF) - Micrel

Part Name

Description

MFG CO.

MIC9131YQS

High-Voltage, High-Speed Telecom DC-to-DC Controller

Micrel 

MIC9131

Ordering Information

Part Number

Standard

Pb-Free

MIC9131BM

MIC9131BQS

MIC9131YM

MIC9131YQS

Max. Duty Cycle Junction Temp. Range

75%

75%

-40°C to +125°C

-40°C to +125°C

Package

16-Pin SOP

16-Pin QSOP

Pin Configuration

LINE 1

VCC 2

RBIAS 3

OSC 4

SYNC 5

COMP 6

FB 7

CPWR 8

16 OUT

15 PGND

14 ISNS

13 UVLO

12 SS

11 AGND

10 EN

9 VBIAS

Micrel, Inc.

Pin Description

Pin Number

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Pin Name

LINE

VCC

RBIAS

OSC

SYNC

COMP

FB

CPWR

VBIAS

EN

AGND

SS

UVLO

ISNS

PGND

OUT

16-Pin SOP (M)

16-Pin QSOP (QS)

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.

M9999-080206

2

August 2006

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