TC1268 datasheet(2/12 Pages) MICROCHIP

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TC1268

DS21379B-page 2

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Input Voltage .........................................................6.5V

Power Dissipation................Internally Limited (Note 6)

Maximum Voltage on Any Pin ........ VIN +0.3V to -0.3V

Operating Temperature ............... -40°C < TJ < +125°C

Storage Temperature.......................... -65°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.

TC1268 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: VIN =VOUT +1V, IL =100µA, CL =3.3µF, SHDN >VIH,TA = 25°C, unless otherwise noted. Boldface

type specifications apply for junction temperatures of -40°C to +125°C.

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

VIN

Input Operating Voltage

2.7

—

6.0

Note 8

IOUTMAX

Maximum Output Current

500

——

VOUT

Output Voltage

—

VR –2.5%

VR ±0.5%

—

VR +2.5%

Note 1

∆V

OUT/∆TVOUT Temperature Coefficient

—

ppm/°C

Note 2

∆V

OUT/∆VIN

Line Regulation

—

0.05

0.35

%(VR +1V) ≤ VIN ≤ 6V

∆VOUT/VOUT

Load Regulation

—

0.002

0.01

%/mA

IL = 0.1mA to IOUTMAX (Note 3)

VIN-VOUT

Dropout Voltage

—

200

350

160

480

800

IL =100µA

IL =100mA

IL =300mA

IL =500mA (Note 4)

IDD

Supply Current (Active Mode)

—

130

µASHDN =VIH,IL =0

ISHDN

Supply Current (Shutdown Mode)

—

µASHDN =0V

TWK

Wake-up Time

(from Shutdown Mode)

—5

µsec

VIN =3.5V, VOUT =2.5V

CIN =COUT =1µF

IL = 250mA (See Figure 3-2)

Settling Time

(from Shutdown Mode)

—15

—

µsec

VIN =3.5V, VOUT =2.5V

CIN =COUT =1µF

IL = 250mA (See Figure 3-2)

PSRR

Power Supply Rejection Ratio

—

FRE ≤ 1kHz

IOUTSC

Output Short Circuit Current

—

1200

1400

VOUT =0V

∆VOUT/∆PD

Thermal Regulation

—

0.04

—

V/W

Note 5

Output Noise

—

260

—

nV/

√Hz IL =IOUT

MAX

SHDN Input

VIH

SHDN Input High Threshold

——

%VIN

VIL

SHDN Input Low Threshold

—

%VIN

Note 1:

VR is the regulator output voltage setting.

Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from

0.1mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the thermal regulation

specification.

Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at a 1V

differential.

Thermal Regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or

line regulation effects. Specifications are for a current pulse equal to ILMAX at VIN = 6V for T = 10 msec.

The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the

thermal resistance from junction-to-air (i.e., TA,TJ, θJA). Exceeding the maximum allowable power dissipation causes the device to initiate

thermal shutdown. Please see Section 4.0 Thermal Considerations for more details.

Hysteresis voltage is referenced to VR.

The minimum VIN has to justify the conditions: VIN ≥ VR +VDROPOUT and VIN ≥ 2.7V for IL = 0.1mA to IOUTMAX.

TC VOUT =(VOUTMAX –VOUTMIN)x 10

VOUT x ∆T

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