TC120

DS21365B-page 2

© 2002 Microchip Technology Inc.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Voltage on LX, Boost Pins

Voltage on EXT1, EXT2, SHDN Pins

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

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

Output Voltage

V

Input Voltage

1.8

—

10.0

V

500

600

600

—

—

—

—

—

—

mA

Supply Current

—

52

55

71

82

86

110

µAV

Shutdown Supply Current

—

1.5

2.5

µA

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

LX Pin Leakage Current

—

—

—

1.5

2

2.5

µA

Measured at EXT1 Pin (Note 2)

No load, SHDN =0V

X

)

LX Pin ON Resistance

—

—

—

0.69

0.64

0.44

0.94

0.85

0.58

Ω

EXT1, EXT2

—

—

—

38

35

24

52

47

32

Ω

connected to 200

Ω load,

EXT1, EXT2

On Resistance to GND

—

—

—

31

29

20

41

37

26

Ω

pulled up through a series

resistance of 200

Ω to a voltage

such that VEXT1, 2 = 0.4V

Oscillator Frequency

255

300

345

kHz

Measured at EXT1 Pin,

Maximum PWM Duty Cycle

—

—

100

%

PFM Duty Cycle

15

25

35

%

No load

η

Efficiency

—

95

—

%

Note

1:

2:

3:

While operating in PWM Mode.