MIC2194_05 datasheet(3/10 Pages) MICREL

3 / 10 page

April 2005

MIC2194

Micrel

Electrical Characteristics

IN = 5V, VOUT = 3.3V, TJ = 25°C, unless otherwise specified. Bold values indicate –40°C<TJ<+125°C.

Parameter

Condition

Min

Typ

Max

Units

Regulation

Feedback Voltage Reference

(1%)

1.233

1.245

1.257

(2%)

1.22

1.245

1.27

Feedback Bias Current

Output Voltage Line Regulation

≤ V

IN ≤ 9V

0.15

% / V

Output Voltage Load Regulation

0mV < (V

IN – VCS) < 75mV

0.9

Output Voltage Total Regulation

≤V

IN ≤ 9V, 0mV < (VIN – VCS) < 75mV (±3%)

1.208

1.282

Input & V

DD Supply

IN Input Current (IQ)

(excluding external MOSFET gate current)

Shutdown Current (I

SD)VEN = 0V

0.5

µA

Digital Supply Voltage (V

DD)IL = 0

2.82

3.0

3.18

Digital Supply Load Regulation

L = 0 to 1mA

0.1

Undervoltage Lockout

DD upper threshold (turn on threshold)

2.65

UVLO Hysteresis

100

Enable/UVLO

Enable Input Threshold

0.6

0.9

1.2

UVLO Threshold

1.4

1.5

1.6

Enable Input Current

EN/UVLO = 5V

0.2

µA

Current Limit

Current Limit Threshold Voltage

IN – VCS voltage to trip current limit

110

130

Error Amplifier

Error Amplifier Gain

V/V

Current Amplifier

Current Amplifier Gain

3.0

V/V

Oscillator Section

Oscillator Frequency (f

360

400

440

kHz

Maximum Duty Cycle

FB = 1.0V

100

Minimum On Time

FB = 1.5V

165

Frequency Foldback Threshold

Measured on FB

0.3

Frequency Foldback Frequency

kHz

Absolute Maximum Ratings (Note 1)

Supply Voltage (V

IN) ..................................................... 15V

Digital Supply Voltage (V

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

Enable Pin Voltage (V

EN) ............................. –0.3V to +15V

Comp Pin Voltage (V

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

Feedback Pin Voltage (V

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

Current Sense Voltage (V

IN –VCS) ................. –0.3V to +1V

Power Dissipation (P

D) ..................... 285mW @ TA = 85°C

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

°C to +150°C

ESD Rating, Note 3 ...................................................... 2kV

Operating Ratings (Note 2)

Supply Voltage (V

IN) .................................... +2.9V to +14V

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

°C ≤ T

J ≤ +125°C

Package Thermal Resistance

JA 8-lead SOP ................................................. 140°C/W

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