TC649 datasheet(3/28 Pages) MICROCHIP

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 2002 Microchip Technology Inc.

DS21449C-page 3

TC649

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage ......................................................... 6V

Input Voltage, Any Pin.... (GND – 0.3V) to (VDD +0.3V)

Package Thermal Resistance:

PDIP (RθJA) ............................................125°C/W

SOIC (RθJA)............................................155°C/W

MSOP (RθJA) ..........................................200°C/W

Specified Temperature Range ........... -40°C to +125°C

Storage Temperature Range.............. -65°C to +150°C

*Stresses above those listed under "Absolute Maximum Rat-

ings" may cause permanent damage to the device. These are

stress ratings only and functional operation of the device at

these or any other conditions above those indicated in the

operation sections of the specifications is not implied. Expo-

sure to absolute maximum rating conditions for extended peri-

ods may affect device reliability.

DC ELECTRICAL SPECIFICATIONS

Electrical Characteristics: Unless otherwise specified, TMIN ≤ TA ≤ TMAX, VDD = 3.0V to 5.5V.

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

VDD

Supply Voltage

3.0

—

5.5

IDD

Supply Current, Operating

—

0.5

1.0

Pins 6, 7 Open,

CF = 1 µF, VIN = VC(MAX)

IDD(SHDN)

Supply Current, Shutdown/

Auto-shutdown Mode

—

µA

Pins 6, 7 Open; Note 1

CF =1 µF, VIN = 0.35V

IIN

VIN, VAS Input Leakage

-1.0

—

+1.0

µA

VOUT Output

VOUT Rise Time

—

µsec IOH = 5 mA, Note 1

VOUT Fall Time

—

µsec IOL = 1 mA, Note 1

tSHDN

Pulse Width (On VIN) to Clear Fault

Mode

—

µsec VSHDN, VHYST

Specifications, Note 1

IOL

Sink Current at VOUT Output

1.0

—

VOL = 10% of VDD

IOH

Source Current at VOUT Output

5.0

—

VOH = 80% of VDD

SENSE Input

VTH(SENSE) SENSE Input threshold Voltage with

Respect to GND

Note 1

FAULT Output

VOL

Output Low Voltage

—

0.3

IOL = 2.5 mA

tMP

Missing Pulse Detector Timer

—

32/F

—

Sec

CF = 1.0 µF

tSTART

Start-up Timer

—

32/F

—

Sec

CF = 1.0 µF

tDIAG

Diagnostic Timer

—

3/F

—

Sec

CF = 1.0 µF

VIN, VAS Inputs

VC(MAX)

Voltage at VIN for 100% Duty Cycle

2.5

2.65

2.8

VC(SPAN)

VC(MAX) - VC(MIN)

1.3

1.4

1.5

VAS

Auto-shutdown Threshold

VC(MAX) -VC(SPAN)

—VC(MAX)

VSHDN

Voltage applied to VIN to Release

Reset/Shutdown

——

VDD x 0.13

VREL

Voltage applied to VIN to Release

Reset Mode

VDD x 0.19

—

VDD = 5V,

See Figure 5-11

VHYST

Hysteresis on VSHDN, VREL

—0.01 x VDD

—V

VHAS

Hysteresis on Auto-shutdown

Comparator

—70

—

Pulse Width Modulator

FOSC

PWM Frequency

CF = 1.0 µF

Note 1: Ensured by design, not tested.

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