TC120_13 Datasheet, PDF(2/16 Page) Microchip Technology – PWM/PFM Step-Down Combination Regulator/Controller

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TC120_13 Datasheet, PDF (2/16 Pages) Microchip Technology – PWM/PFM Step-Down Combination Regulator/Controller

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TC120

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 â 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 ...................................Â±50mA

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

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

Storage Temperature Range ..............-40Â°C to +150Â°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 circuit of Figure 3-1, TA = 25ï°C, VIN = VR x 1.2, Note 1 unless otherwise noted.

Symbol

Parameter

Min

Typ

Max Units

Test Conditions

VOUT Output Voltage

VR x 0.975 VR Â± 0.5% VR x 1.025 V VOUT = 3.0V IOUT = 120mA (Note 1)

VOUT = 3.3V IOUT = 132mA

VOUT = 5.0V IOUT = 200mA

VIN

Input Voltage

1.8

10.0

IOUTMAX Maximum Output Current

500

600

mA VOUT = 3.0V

VOUT = 3.3V

VOUT = 5.0V

IIN

Supply Current

ïA VOUT = 3.0V VIN = VR x 1.05, no load

VOUT = 3.3V

110

VOUT = 5.0V

ISHDN Shutdown Supply Current

1.5

2.5

ïA No load, SHDN = 0V, (Note 2)

ILX

LX Pin Leakage Current

ïA Measured at EXT1 Pin (Note 2)

1.5

2.5

No load, SHDN = 0V

RDSON(L LX Pin ON Resistance

REXTH EXT1, EXT2

On Resistance to VIN

REXTL EXT1, EXT2

On Resistance to GND

0.69

0.94

ï VOUT = 3.0V VOUT = VR x 0.9 (Note 2)

0.64

0.85

VOUT = 3.3V VLX = VIN â 0.2V, 10ï

0.44

0.58

VOUT = 5.0V Resistor from LX to VIN,

SHDN = VIN

ï VOUT = 3.0V SHDN = VIH; EXT1 and EXT2

VOUT = 3.3V connected to 200ï load,

VOUT = 5.0V VEXT1 = VEXT2 = (VIN â 0.4V);

VOUT = VIN (Note 2)

ï VOUT = 3.0V SHDN = VIH; EXT1 and EXT2

VOUT = 3.3V pulled up through a series

VOUT = 5.0V resistance of 200ïï 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

ï¨

Note

Efficiency

1: VR is the factory-programmed output voltage setting.

2: No external components connected, except CSS.

3: While operating in PWM Mode.

% VIN > VR x 1.2

DS21365C-page 2

ï£ 2001-2012 Microchip Technology Inc.

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