MIC3230 datasheet(4/20 Pages) MICREL

Part #	MIC3230

Description	Constant Current Boost Controller for Driving High Power LEDs

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Micrel, Inc.

MIC3230/1/2

January 2009

4

M9999-011409-A

Absolute Maximum Ratings

(1)

Supply Voltage (VIN).....................................................+48V

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

(3)..................... MIC3230= 1500V HB, 100VMM

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

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

Operating Ratings

(2)

Supply Voltage (VIN)......................................... +6V to +45V

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

Junction Thermal Resistance

MSOP-10 (

θJA)..............................................130.5°C/W

EPAD TSSOP-16 (

θJA) ...................................36.5°C/W

3mmx3mm MLF

®-12L (θJA).............................60.7°C/W

Electrical Characteristics

(4)

VIN = 12V; VEN = 3.6V; L = 47µH; C = 4.7µF; TJ = 25°C, Bold values indicate –40°C≤ TJ ≤ +125°C, unless noted.

Symbol

Parameter

Condition

Min

Typ

Max

Units

VIN

Supply Voltage Range

6

45

V

UVLO

Under Voltage Lockout

3.5

4.9

5.5

V

IVIN

Quiescent Current

VFB > 275mV (to ensure device is not

switching)

3.2

10

mA

ISD

Shutdown Current

VEN = 0V

30

µA

Room temperature (3%)

242.5

250

257.5

mV

VIADJ

Feedback Voltage (at IADJ)

–40°C≤ TJ ≤ +125°C (5%)

237.5

250

262.5

mV

IADJ

Feedback Input Current

VFB = 250mV

1.2

3

µA

Line Regulation

VIN = 12V to 24V

2

%

Load Regulation

VOUT to 2 × VOUT

2

%

DMAX

Maximum Duty Cycle

MIC3230 & MIC3232

MIC3231

90

88

%

VEN

Enable Threshold

Turn ON

Turn OFF

1.5

1.15

1.1

0.4

V

IEN

Enable Pin Current

VEN = 3.3V

REN = 100kΩ

17

30

µA

VPWM

PWMD Threshold

Turn ON

Turn OFF

1.5

0.75

0.7

0.4

V

fPWMD

PWMD Frequency Range

Note 5 (L = 47µH; C = 4.7µF)

0

500

Hz

fSW

Programmable Oscillator

Frequency

RFREQ = 82.5kΩ

RFREQ = 21kΩ

RFREQ = 8.25kΩ

360

109

400

950

440

kHz

fSW

Fixed Frequency Option

(MIC3232YMM)

360

400

440

kHz

FDITHER

Low EMI (MIC3231)

Frequency dither shift from nominal

±12

%

VSENS

Current Limit Threshold

Voltage

RSENSE = 390Ω

0.315

0.45

0.585

V

ISENSE

ISENSE peak current out

RSENSE = 390Ω

250

µA

VOVP

Over Voltage Protection

1.203

1.24

1.277

V

Driver Impedance

SINK

SOURCE

2.4

2

3.5

Ω

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