MIC2155 datasheet(8/35 Pages) MICREL

8 / 35 page

Micrel, Inc.

MIC2155/2156

November 2009

M9999-111209-B

Electrical Characteristics

(3) cont.

TJ = 25°C; VEN = VIN1 = VIN2 =12V; unless otherwise specified. Bold values indicate -40°C≤TJ≤+125°C

Parameter

Condition

Min

Typ

Max

Units

Current Sense

CS Over Current Trip Point

Program Current

180

195

220

µA

CS Comparator Sense

Threshold

(Senses drop across low-side FET)

-10

+10

Power Good

VFB Threshold

88.5

%Nom

PGOOD Voltage Low

VFB = 0 V; IPGOOD = 1mA

0.225

0.3

Gate Drivers

Rise/Fall Time

Into 3000pF

Source

Sink

High-Side Drive Resistance

VDD = VIN = 5V

Source

Sink

1.6

1.7

3.5

2.5

Ω

Low-Side Drive Resistance

VDD = VIN = 5V

Source

Sink

1.4

3.5

2.5

Ω

Driver Non-Overlap Time

(adaptive)

Notes:

1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating

the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(Max), the

junction-to-ambient thermal resistance,

θ JA, and the ambient temperature, TA. The maximum allowable power dissipation will result in excessive die

temperature, and the regulator will go into thermal shutdown.

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

3. Specification for packaged product only.

4. Minimum on-time before automatic cycle skipping begins. See applications section.

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