MIC2185 datasheet(3/15 Pages) MICREL

3 / 15 page

May 2002

MIC2185

Micrel

Absolute Maximum Ratings (Note 1)

Supply Voltage (V

INA, VINP) ......................................... 15V

Digital Supply Voltage (V

DD) ........................................... 7V

Skip Pin Voltage (V

SKIP) .................................. –0.3V to 7V

Comp Pin Voltage (V

COMP) .............................. –0.3V to 3V

Feedback Pin Voltage (V

FB) ............................ –0.3V to 3V

Enable Pin Voltage (V

EN/UVLO) ..................... –0.3V to 15V

Current Sense Voltage (V

CSH) ......................... –0.3V to 1V

Sync Pin Voltage (V

SYNC) ................................ –0.3V to 7V

Freq/2 Pin Voltage (V

FREQ/2) ........................... –0.3V to 7V

Power Dissipation (P

16 lead SOP .................................. 400mW @ T

A = 85°C

16 lead QSOP ................................ 245mW@ T

A = 85°C

Ambient Storage Temp ............................ –65

°C to +150°C

Operating Ratings (Note 2)

Supply Voltage (V

INA, VINP) ........................ +2.9V to +14V

Operating Ambient Temperature ......... –40

°C ≤ T

A ≤ +85°C

Junction Temperature ....................... –40

°C ≤ T

J ≤ +125°C

PackageThermal Resistance

JA 16-lead SOP ............................................... 100°C/W

JA 16-lead QSOP ............................................. 163°C/W

ESD Rating, Note 3

Electrical Characteristics

INA= 5V, VinP= VOUT=12V, VEN/UVLO = 5V, VSKIP = 0V, VFREQ/2 = 0V, VCSH = 0V, TJ = 25°C, unless otherwise specified. Bold values

indicate –40

°C < T

J < +125°C.

Parameter

Condition

Min

Typ

Max

Units

Regulation

Feedback Voltage Reference

(

±1%)

1.233

1.245

1.258

(

±2%)

1.220

1.270

≤ V

INA ≤ 9V; 0mV ≤ CSH ≤ 75mV; (±3%)

1.208

1.245

1.282

Feedback Bias Current

Output Voltage Line Regulation

≤ V

INA ≤ 9V

+0.08

% / V

Output Voltage Load Regulation

0mV

≤ CSH ≤ 75mV

–1.2

Input & V

DD Supply

INA Input Current, PWM mode

SKIP = 0V

0.8

INP Input Current, PWM mode

SKIP = 0V (excluding external MOSFET gate current)

3.8

INA Input Current, SKIP mode

SKIP = 5V

0.6

Shutdown Quiescent Current

EN/UVLO = 0V; (IVINA + IVINP)

0.5

µA

Digital Supply Voltage (VDD)

L = 0

2.8

3.0

3.2

Digital Supply Load Regulation

L = 0 to 0.5mA

0.03

Undervoltage Lockout

DD upper threshold (turn on threshold)

2.9

2.75

DD lower threshold (turn off threshold)

2.65

Reference Output (V

REF)

Reference Voltage

(

±1.5%)

1.226

1.245

1.264

(

±2.5%)

1.213

1.276

Reference Voltage Line

5V < VinA < 9V

Regulation

Reference Voltage Load

0 < I

REF < 100µA1

Regulation

Enable/UVLO

Enable Input Threshold

0.6

0.9

1.2

UVLO Threshold

1.4

1.5

1.6

UVLO Hysteresis

140

Enable Input Current

EN/UVLO = 5V

0.2

µA

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