MIC2198BML datasheet(3/14 Pages) MICREL

3 / 14 page

October 2005

MIC2198

Micrel, Inc.

Absolute Maximum Ratings (Note 1)

Analog Supply Voltage (VIN)........................................+34V

Digital Supply Voltage (VDD)..........................................+7V

Driver Supply Voltage (BST) ...................................VIN + 7V

Sense Voltage (VOUT, CSH) ...............................7V to –0.3V

Enable Pin Voltage (VEN/UVLO)....................................... VIN

Power Dissipation (PD)

4×4 MLF™..................................665mW @ TA = 85°C

Ambient Storage Temperature (TS).......... –65°C to +150°C

ESD,

Note 3 ................................................................ 2kV

Operating Ratings (Note 2)

Analog Supply Voltage (VIN)......................... +4.5V to +32V

Output Voltage Range (VOUT) ....................... +0.8V to +6V

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

Package Thermal Resistance

4×4 MLF-12L (θJA)...............................................60°C/W

Electrical Characteristics (Note 4)

VIN = VEN = 12V; TJ = 25°C, unless noted, bold values indicate –40°C ≤ TJ ≤ +125°C

Parameter

Condition

Min

Typ

Max

Units

Feedback Voltage Reference

(±1%)

0.792

0.8

0.808

Feedback Voltage Reference

(±2%)

0.784

0.816

Feedback Voltage Reference

4.5V < VIN < 32V, 0 < (VCSH – VOUT) < 60mV (±3%)

0.776

0.824

Feedback Bias Current

Output Voltage Range

0.8

Output Voltage Line Regulation

VIN = 4.5V to 32V, VCSH – VOUT = 60mV

0.03

%/V

Output Voltage Load Regulation

25mV < (VCSH – VOUT) < 60mV

0.5

Input and VDD Supply

Quiescent Current

excluding external MOSFET gate drive current

3.5

Shutdown Quiescent Current

VEN/UVLO = 0V

0.1

µA

Digital Supply Voltage (VDD)

IL = 0mA to 5mA

4.7

5.0

5.3

Undervoltage Lockout

VIN upper threshold (turn-on threshold)

4.25

4.4

VIN lower threshold (turn-off threshold)

3.95

4.1

Enable/UVLO

Enable Input Threshold

(rising)

0.6

1.1

1.6

UVLO Threshold

(rising)

2.2

2.5

2.8

Enable Input Current

VEN/UVLO = 5V

0.1

µA

Current Limit

Current Limit Threshold Voltage

(VCSH – VOUT)

Error Ampliﬁer

Transconductance Error Ampliﬁer GM

0.2

Oscillator Section

Oscillator Frequency

450

500

550

kHz

Maximum Duty Cycle

Minimum On-Time

150

200

Frequency Foldback Threshold

measured at VOUT pin

0.25

0.40

0.55

Foldback Frequency

125

kHz

Gate Drivers

Rise/Fall Time

CL = 3000pF

Output Driver Impedance

source

8.5

sink

3.5

Driver Non-Overlap Time

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 protected; however, handling precautions are recommended. Human body model, 1.5k in series with 100pF.

Note 4. Speciﬁcation for packaged product only.

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