MIC4827 datasheet(3/13 Pages) MICREL

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January 2005

MIC4827

Micrel

Absolute Maximum Ratings (Note 1)

Supply Voltage (V

DD) ....................................... –0.5V to 6V

Output Voltage (V

CS) ................................... –0.5V to 100V

Frequency Control Voltage (V

RSW, VREL) ... –0.5V to (VDD +0.3V)

Power Dissipation @ T

A = 85°C ............................. 200mW

Storage Temperature (T

S) ....................... –65°C to +150°C

ESD Rating .............................................................. Note 3

Operating Ratings (Note 2)

Supply Voltage (V

DD) .................................. +1.8V to +5.5V

Lamp Drive Frequency (f

EL) ...................... 60Hz to 1000Hz

Switching Transistor Frequency (f

SW) ........ 8kHz to 200kHz

Ambient Temperature (T

A) ......................... –40°C to +85°C

Package Thermal Resistance

MSOP (θJA) ....................................................... 206°C/W

Electrical Characteristics

IN = VDD = 3.0V, RSW = 560KΩ, REL = 1.0MΩ. TA = 25°C unless otherwise specified. Bold values indicate –40°C ≤ TA ≤ +85°C

Symbol

Parameter

Condition

Min

Typ

Max

Units

DS(ON)

On-resistance of switching transistor

SW = 100 mA, VCS = 85V

3.8

7.0

Ω

Output voltage regulation

DD = 1.8V to 5.5V

A – VB

Output peak-to-peak voltage

DD = 1.8V to 5.5V

170

180

190

166

194

EN-L

Input low voltage (turn-off)

DD = 1.8V to 5.5V

0.5

EN-H

Input high voltage (turn-on)

DD = 1.8V to 5.5V

DD–0.5

Shutdown current, Note 4

SW = LOW; REL = LOW;

0.01

0.1

µA

DD = 5.5V

0.5

µA

VDD

Input supply current

SW = HIGH; REL = HIGH;

µA

CS = 85V; VA, VB OPEN

Boosted supply current

SW = HIGH; REL = HIGH;

200

400

µA

CS = 85V; VA, VB OPEN

Input current including inductor

IN = VDD = 1.8V

current

(See Test Circuit)

A–VB output drive frequency

285

360

435

Switching transistor frequency

kHz

Switching transistor duty cycle

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

The device is not guaranteed to function outside its operating rating.

Note 3.

Devices are ESD sensitive. Handling precautions recommended.

Note 4.

Shutdown current is defined as the sum of current going into pin 1, 5, and 6 when the device is disabled.

Test Circuit

COUT

0.033µF/100V

1N4148

220µH

VDD

RSW

REL

GND

MIC4827

CIN

10µF

10nF

VIN

562k

3.32M

100Ω

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