July 2002

1

MIC2186

MIC2186

Micrel

MIC2186

Low Voltage PWM Control IC

Final Information

General Description

Micrel’s MIC2186 is a high efficiency boost PWM control IC.

With its wide input voltage range of 2.9V to 14V, the MIC2186

can be used to efficiently boost voltages in 1- or 2-cell Li Ion

battery powered applications, as well as to boost voltages in

fixed 3.3V, 5V, or 12V systems. Its powerful 1.6

Ω output

driver allows the MIC2186 to supply large output currents with

the selection of proper external MOSFETs.

The MIC2186 can be configured to operate at 100kHz,

200kHz, or 400kHz. With it’s fixed frequency PWM architec-

ture, and easily synchronized drive, the MIC2186 is ideal for

noise-sensitive telecommunications applications.

MIC2186 also features a low current shutdown mode of

0.5

µA and programmable undervoltage lockout. A manually

selectable SKIP Mode allows high efficiencies in light load

situations.

The MIC2186 is available in 16 pin SOIC and QSOP package

options with an operating range from –40

°C to 125°C.

Typical Application

VINA

Si4404DY

(x2)

4.5m

Ω

2.2

µH

MBR2535CT

120

µF

20V

150

µF(x2)

20V

EN/UVLO

HIDC

FREQ/2

VDD

COMP

VREF

SKIP

SYNC

SS

MIC2186

SGND

VINP

FB

OUTN

CSH

PGND

3

12

9

14

6

16

7

5

11

2

8

4

10

15

13

1

60

65

70

75

80

85

90

95

0

0.5

1

1.5

2

2.5

3

OUTPUT CURRENT (A)

12V Output Efficiency

V

Adjustable Output Boost Converter

Features

• Input voltage range: 2.9V to 14V

• 1.6

Ω output driver

• Oscillator frequency of 100kHz/200kHz/400kHz

• Frequency sync to 600kHz

• Front edge blanking

• PWM Current Mode Control

• Selectable light load SKIP mode

• 600

µA quiescent current (SKIP-Mode)

• 0.5

µA shutdown current

• Cycle-by-Cycle current limiting

• Frequency foldback protection

• Adjustable under-voltage lockout

• Precision 1.245V reference output

• 16 pin SOIC and QSOP package options

• Selectable 50% maximum duty cycle for flyback applica-

tions

Applications

• DC power distribution systems

• Wireless Modems

• ADSL line cards

• SLIC power supplies

• 1-and 2-cell Li Ion battery operated equipment

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

Ordering Information

Part Number

Frequency

Voltage

Ambient Temp. Range

Package

MIC2186BM

100kHz/200kHz/400kHz

Adj

–40

°C to +125°C

16-lead SOP

MIC2186BQS

100kHz/200kHz/400kHz

Adj

–40

°C to +125°C

16-lead QSOP