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TC1142

Inductorless -2x Boost/Buck Regulator

Microchip Technology 

TC1142

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage (VIN) with COUT Connected ..........6.5V

CCLK Voltage................................-0.3V to (V+ + 0.3V)

Power Dissipation.............................................320mW

Operating Temperature Range

8-Pin MSOP .................................-40°C to +85°C

Storage Temperature Range ..............-65°C to +160°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.

TC1142 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: RL = ∞, VIN = 3.2V, Mode = -2x, C1 = C2 = 0.47µF (Note 1), CCLK = VIH, COUT = 4.7µF, for VR = 3V,

VIN = 3.5V, TA = TMIN to TMAX, unless otherwise noted.

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

VIN

VOUT

VP-P

ISUPPLY

ISUPPLY1

ROUTCL

ROUT

fOSC

fCCLK

PEFF

VIH

VIL

Note 1:

2:

3:

4:

Supply Voltage

2.5

—

5.5

V

Output Voltage

Output Ripple

Supply Current

-(VR + 0.2) -VR -(VR – 0.2) V IL = 0mA (Note 2)

—

100

—

mV IL = 10mA

—

200

400

µA

—

0.1

1

µA CCLK = 0V

Closed-Loop Output Resistance

—

2

6

Ω

Open-Loop Output Resistance

—

30

—

Ω (Note 3)

Internal Oscillator Frequency

150

200

275

kHz

External Clock Frequency, Typical

3

—

500

kHz (Note 4)

Power Efficiency

CCLK Input High Threshold

70

76

—

% IL = 10mA, VR = 5V; (See Equation 3-5)

2.2

—

—

V

CCLK Input Low Threshold

—

—

1.0

V

Assume C1 and C2 have an ESR of 1Ω.

VR is the voltage output specified in the ordering option.

Measured in -1x Mode. For VR = 3V, VIN = 2.5V.

CCLK is driven with an external clock. Minimum frequency = 1/2t0 at 50% duty cycle, where t0 is the counter timeout period.

DS21360B-page 2

 2002 Microchip Technology Inc.

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