April 2005

1

M9999-040805

MIC9130

Micrel, Inc.

MIC9130

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

General Description

TheMIC9130isacurrent-modePWMcontrollerthatefficiently

converts –48V telecom voltages to logic levels. The MIC9130

features a high voltage start-up circuit that allows the device to

beconnectedtoinputvoltagesashighas180V.Thehighinput

voltage capability protects the MIC9130 from line transients

that are common in telecom systems. The start-up circuitry

also saves valuable board space and simplifies designs by

integrating several external components.

The MIC9130 is capable of high speed operation. Typically

the MIC9130 can control a sub-25ns pulse width on the gate

out pin. Its internal oscillator can operate over 2.5MHz, with

even higher frequencies available through synchronisation.

The high speed operation of the MIC9130 is made safe by

the very fast, 34ns response from current sense to output,

minimizing power dissipation in a fault condition.

The MIC9130 allows for the designs of high efficiency power

supplies. It can achieve efficiencies over 90% at high output

currents.Itslow1.3mAquiescentcurrentallowshighefficiency

even at light loads.

The MIC9130 has a maximum duty cycle of 50%. For de-

signs requiring a high duty cycle, refer to the MIC9131. The

MIC9130 is available in a 16-pin SOP and 16-pin QSOP

package options. The rated junction temperature range is

from –40°C to +125°C.

Typical Application

OUT

Slope

Compensation

ISNS

FB

VBIAS

SYNC

CPWR

AGND PGND

SS

OSC

RBIAS

COMP

2

1

13

10

5

12

4

16

14

7

6

8

3

9

11

15

MIC9130

VOUT

3.3V @ 4A

VIN

36V to 72V

12V

OPTO

FEEDBACK

T1

Si4884DY

Si4800DY

B330

2.5µH

330µF (x2)

6.3V

FQD10N20

0.2Ω

200V

0.2Ω

1W

332k

47pF

4.75k

332k

10nF

0.1µF

1M

38.3k

MBR0540�

40V/0.5A

1µF

16V

20Ω

0.1µF

1.21k

20k

N = 4

N = 20

N = 5

1.5MHz DSL Power Supply

Features

• Input voltages up to 180V

• Internal oscillator capable of >2.5MHz operation

• Synchronisation capability to 4MHz

• Current sense delay of 34ns

• Minimum pulse width <25ns

• 90% efficiency

• 1.3mA quiescent current

• 1µA shutdown current

• Soft-start

• Resistor programmable current sense threshold

• Selectable soft-start retry

• 4Ω sink, 12Ω source output driver

• Programmable under-voltage lockout

• Constant-frequency PWM current-mode control

• 16-pin SOIC and 16-pin QSOP

Applications

• Telecom power supplies

• Line cards

• ISDN network terminators

• Micro- and pico-cell base stations

• Low power (< 30W) dc-dc converters

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com