TC120 datasheet(2/14 Pages) MICROCHIP

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TC120

DS21365B-page 2

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Power Supply Voltage (VIN).................... -0.3V to +12V

Voltage on VOUT Pin ............................... -0.3V to +12V

Voltage on LX, Boost Pins

................................... (VIN – 12V) to (VIN +0.3V)

Voltage on EXT1, EXT2, SHDN Pins

.......................................... (-0.3V) to (VIN +0.3V)

LX Pin Current .............................................. 700mA pk

EXT1, EXT2 Pin Current ...................................±50mA

Continuous Power Dissipation .........................300mW

Operating Temperature Range............. -40°C to +85°C

Storage Temperature Range .............. -40°C to +150°C

*Stresses above those listed under "Absolute Maximum

Ratings" 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.

Exposure to Absolute Maximum Rating conditions for

extended periods may affect device reliability.

TC120 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: Test circuitofFigure 3-1, TA =25°C, VIN =VR x 1.2, Note 1 unless otherwise noted.

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

VOUT

Output Voltage

VR x0.975 VR ±0.5% VR x1.025

VOUT =3.0V

VOUT =3.3V

VOUT =5.0V

IOUT = 120mA (Note 1)

IOUT = 132mA

IOUT = 200mA

VIN

Input Voltage

1.8

—

10.0

IOUTMAX Maximum Output Current

500

600

—

VOUT =3.0V

VOUT =3.3V

VOUT =5.0V

IIN

Supply Current

—

110

µAV

OUT =3.0V

VOUT =3.3V

VOUT =5.0V

VIN =VR x 1.05, no load

ISHDN

Shutdown Supply Current

—

1.5

2.5

µA

No load, SHDN =0V, (Note 2)

ILX

LX Pin Leakage Current

—

1.5

2.5

µA

Measured at EXT1 Pin (Note 2)

No load, SHDN =0V

RDSON(L

)

LX Pin ON Resistance

—

0.69

0.64

0.44

0.94

0.85

0.58

Ω

VOUT =3.0V

VOUT =3.3V

VOUT =5.0V

VOUT =VR x0.9 (Note2)

VLX =VIN –0.2V, 10Ω

Resistor from LX to VIN,

SHDN =VIN

REXTH

EXT1, EXT2

On Resistance to VIN

—

Ω

VOUT =3.0V

VOUT =3.3V

VOUT =5.0V

SHDN =VIH; EXT1 and EXT2

connected to 200

Ω load,

VEXT1 =VEXT2 =(VIN –0.4V);

VOUT =VIN (Note 2)

REXTL

EXT1, EXT2

On Resistance to GND

—

Ω

VOUT =3.0V

VOUT =3.3V

VOUT =5.0V

SHDN =VIH; EXT1 and EXT2

pulled up through a series

resistance of 200

Ω to a voltage

such that VEXT1, 2 = 0.4V

fOSC

Oscillator Frequency

255

300

345

kHz

Measured at EXT1 Pin,

VIN =VOUT +0.3V,

IOUT =20mA (Note 3)

DPWM

Maximum PWM Duty Cycle

—

100

DPFM

PFM Duty Cycle

No load

Efficiency

—

VIN >VR x1.2

Note

VR is the factory-programmed output voltage setting.

No external components connected, except CSS.

While operating in PWM Mode.

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