Micrel, Inc.

MIC3230/1/2

January 2009

4

M9999-011409-A

Absolute Maximum Ratings

(1)

Enable Pin Voltage........................................... -0.3V to +6V

IADJ Voltage ..................................................................+6V

Lead Temperature (soldering, #sec.)......................... 260°C

Storage Temperature (Ts)..........................-65°C to +150°C

ESD Rating

.........................................MIC3232= 2kV HB, 100VMM

.................................... MIC3231= 1500V HB, 150VMM

Operating Ratings

(2)

Junction Temperature (TJ)........................ –40°C to +125°C

Junction Thermal Resistance

MSOP-10 (

EPAD TSSOP-16 (

3mmx3mm MLF

Electrical Characteristics

(4)

Symbol

Parameter

Condition

Min

Typ

Max

Units

Supply Voltage Range

6

45

V

UVLO

Under Voltage Lockout

3.5

4.9

5.5

V

Quiescent Current

switching)

3.2

10

mA

Shutdown Current

30

µA

Room temperature (3%)

242.5

250

257.5

mV

Feedback Voltage (at IADJ)

237.5

250

262.5

mV

Feedback Input Current

1.2

3

µA

Line Regulation

2

%

Load Regulation

2

%

Maximum Duty Cycle

MIC3230 & MIC3232

MIC3231

90

88

%

%

Enable Threshold

Turn ON

Turn OFF

1.5

1.15

1.1

0.4

V

V

Enable Pin Current

VEN = 3.3V

REN = 100kΩ

17

30

µA

PWMD Threshold

Turn ON

Turn OFF

1.5

0.75

0.7

0.4

V

V

PWMD Frequency Range

Note 5 (L = 47µH; C = 4.7µF)

0

500

Hz

Programmable Oscillator

Frequency

360

109

400

950

440

kHz

kHz

kHz

Fixed Frequency Option

(MIC3232YMM)

360

400

440

kHz

Low EMI (MIC3231)

Frequency dither shift from nominal

±12

%

Current Limit Threshold

Voltage

0.315

0.45

0.585

V

250

µA

Over Voltage Protection

1.203

1.24

1.277

V

Driver Impedance

SINK

SOURCE

2.4

2

3.5

Ω

Ω