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TC105

PFM/PWM Step-Down DC/DC Controller

Microchip Technology 

TC105

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Voltage on VDD....................................... -0.3V to +12V

EXT Output Current ........................................±100mA

Voltage on VOUT, EXT,

SHDN Pins .....................................-0.3V to VDD +0.3V

Power Dissipation.............................................150mW

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

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

TC105 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: Note 1, fOSC = 300 kHz; TA = 25°C, unless otherwise noted.

Symbol

Parameter

Min

Typ

Max Units

Test Conditions

VDD

Operating Supply Voltage

2.2

—

10.0

V

VDDMIN

Minimum Input Voltage

0.9

—

2.2

V EXT = High; No external components;

VOUT = 0V, SHDN = VIN

IDD

Operating Supply Current

—

57

102

µA No external components; VR = 3.0V, 3.3V

—

67

122

VOUT = 0V, SHDN = VIN VR = 5.0V

ISTBY

Standby Supply Current

—

15

27

µA No external components; VR = 3.0V, 3.3V

—

16

29

VOUT = SHDN = VIN

VR = 5.0V

ISHDN

Shutdown Supply Current

—

—

0.5

µA SHDN = GND

fOSC

Oscillator Frequency

255

300

345

kHz VIN = VOUT + 0.3V

VOUT

Output Voltage

VR x 0.975 VR VR x 1.025

Note 2

DTYMAX Maximum Duty Cycle (PWM Mode) 100

—

—

%

DTYPFM Duty Cycle (PFM Mode)

VIH

VIL

REXTH

SHDN Input Logic High

SHDN Input Logic Low

EXT ON Resistance to VDD

REXTL EXT ON Resistance to GND

η

Efficiency

15

25

35

% IOUT = 0mA

0.65

—

—

V VOUT = 0V, No external components

—

—

0.20

V VOUT = 0V, No external components

—

17

24

Ω No external components; VR = 3.0V

—

16

22

VR = 3.3V

—

12

17

VR = 5.0V

VOUT = SHDN = VIN, VEXT = (VIN – 0.4V)

—

15

20

Ω No external components; VR = 3.0V

—

14

19

VR = 3.3V

—

10

14

VR = 5.0V

VOUT = 0V, SHDN = VIN, VEXT = 0.4V

—

92

—

%

Note

1: VR = 3.0V, VIN = 4.5V, IOUT = 200mA

VR = 3.3V, VIN = 5.0V, IOUT = 220mA

VR = 5.0V, VIN = 7.5V, IOUT = 320mA

2: VR is the factory output voltage setting.

DS21349B-page 2

© 2002 Microchip Technology Inc.

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