MIC33M350 datasheet(7/32 Pages) MICROCHIP

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DS20006348B-page 7

MIC33M350

TON Control/Switching Frequency

Switching ON Time

TON

—180

—

VIN = 5V, VOUT = 1V

Switching Frequency

FREQ

—1.2

—

MHz

VOUT = 1.0V, IOUT = 3A

(Note 3)

—1.1

—

VOUT = 3.3V, IOUT = 3A

Maximum Duty Cycle

DCMAX

—

100

Note 3

Short Circuit Protection

High-Side MOSFET Forward

Current Limit

ILIM_HS

6.5

Note 2

Low-Side MOSFET Forward

Current Limit

ILIM_LS

—4.2

—

Note 2, Note 3

Low-Side MOSFET Negative

Current Limit

ILIM_NEG

-2

-3

-4

Note 2

N-Channel Zero-Crossing

Threshold

IZC_TH

—0.9

—

Note 3

Current Limit Pulses Before

Hiccup

HICCUP

—

Cycles Note 3

Hiccup Period Before Restart

—

Note 3

Internal MOSFETs

High-Side On Resistance

RDS-ON-HS

—30

mΩ

ISW =1A

Low-Side On Resistance

RDS-ON-LS

—16

mΩ

ISW =-1A

Output Discharge Resistance RDS-ON-DSC

—10

Ω

VEN =0V, VSW = 5.5V, from

VOUT to PGND

SW Leakage Current

ILEAK_SW

—1

µA

PVIN = 5.5V, VSW = 0V,

VEN =0V,

current flowing out of SW pin

Power-Good (PG)

Power Good Threshold

PG_TH

%VOUT VOUT rising (good)

Power Good Hysteresis

PG_HYS

—

%VOUT VOUT falling (Note 3)

Power Good Blanking Time

PG_BLANK

—

µs

Note 3

PG Output Leakage Current

PG_LEAK

—

300

VOUT =VOUT (NOM),

VPG =5.5V

Power Good Sink Low

Voltage

PG_SINKV

—

200

VOUT = 0V; IPG =10mA

Thermal Shutdown

TSHDN

—165

—

°C

TJ rising (Note 3)

Thermal Shutdown Hysteresis TSHDN_HYST

—22

—

°C

TJ falling (Note 3)

Thermal Latch-Off Soft Start

Cycles

TH_LATCH

—

Note 3

ELECTRICAL CHARACTERISTICS (1) (CONTINUED)

Electrical Specifications: Unless otherwise specified, PVIN =5V; VOUT = 1.0V, COUT = 47 µF, TA = +25°C.

Boldface values indicate -40°C

 TJ  +125°C.

Parameter

Symbol

Min.

Typ.

Max.

Units

Test Conditions

Note 1: Specification for packaged product only.

2: Tested in open loop. The closed-loop current limit is affected by the inductance value.

3: Not production tested, data from bench characterization only

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