MIC2133 datasheet(6/50 Pages) MICROCHIP

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DS20006653B-page 6

MIC2133

On Timer

Nominal Switching Frequency per

Phase

fSWNOM_PH

400

500

600

kHz

VIN = 12V, VOUTS = 5V,

RFREQ = 40.2 kΩ

Minimum Switching Frequency

per Phase

fSWMIN_PH

—

100

—

kHz

VIN = 12V, VOUTS = 5V,

RFREQ = 200 kΩ

Maximum Switching Frequency

per Phase

fSWMAX_PH

—

800

—

kHz

VIN = 12V, VOUTS = 5V,

RFREQ = 25.5 kΩ

Minimum On-Time

TONMIN

—

Measured in application

(Note 2)

Minimum Off-Time

TOFFMIN

—

360

—

VFBS = 0V

Maximum Duty Cycle

DMAX

—85

—

fSW = 400 kHz per phase

(Note 4)

Minimum Duty Cycle

DMIN

—0

—

VFBS = +1V (Note 2)

Current Limit

ILIM Source Current

ICL

8.3

9.6

10.56

µA

—

ILIM Source Current Tempco

TCICL

—

ppm/ºC Note 2

Nominal Current Limit Threshold

Voltage per Phase

VILIM_TH

139

156

174

RILIM = 60.4 kΩ

—47

—

RILIM = 105 kΩ

—

250

—

RILIM = 21 kΩ

Negative Current Limit Threshold

Voltage

VILIM_NTH

RILIM = 60.4 kΩ

Zero-Crossing Detection

Zero-Crossing Detection Threshold

VZCD_TH

-10

–4

-0.6

—

Current Sharing Amplifier

CSH Operating Point

VCSH_OP

1.154

1.19

1.244

VCSN1 = VCSN2 = VCSP1 =

VCSP2 = 0V

Current Sense Amplifier(s) Gain

GCSA

—

V/V

As reflected on CSH pin and

DROOP pin

Current Sense Input Voltage

Range

VCS

-120

—

+120

-40ºC ≤ TJ ≤ +125ºC

Phase to Phase Current Balance

ΔIPH

—

Using equal sense resistors on

the bottom, equal inductances,

fSW = 500 kHz, VIN = 12V,

VOUT = 5V,

VCSP1 – VCSN1 = -120 mV,

VCSP2 – VCSN2 = -120 mV

ELECTRICAL CHARACTERISTICS(1) (CONTINUED)

Electrical Characteristics: VIN =12V; VOUT =5V; fSW = 500 kHz/phase; VBST – VSW =5V; TA = +25°C; unless noted.

Boldface values indicate -40°C ≤ TJ ≤ +125°C.

Parameters

Symbol

Min.

Typ.

Max.

Units

Conditions

Note 1: Specification for packaged product only.

2: Ensured by design and characterization. Not production tested.

3: Measured in Test mode.

4: The maximum duty cycle is limited by the fixed mandatory off-time of typically 360 ns.

5: Limited by maximum junction temperature TJ = +125°C.

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