TPS7A4201DGNT datasheet(3/19 Pages) TI1

No de pièce	TPS7A4201DGNT

Description	28-V Input Voltage, 50-mA Voltage Regulator

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Fabricant	TI1 [Texas Instruments]

Site Internet	http://www.ti.com

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TPS7A42

www.ti.com

SBVS184

– DECEMBER 2011

ELECTRICAL CHARACTERISTICS

At TJ = –40°C to +125°C, VIN = VOUT(NOM) + 2.0 V or VIN = 7.0 V (whichever is greater), VEN = VIN, IOUT = 100 µA, CIN = 1 μF, COUT = 4.7 μF,

and FB tied to OUT, unless otherwise noted.

TPS7A42

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIN

Input voltage range

7.0

28.0

V

VREF

Internal reference

TJ = +25°C, VFB = VREF, VIN = 9 V, IOUT = 25 mA

1.161

1.173

1.185

V

Output voltage range(1)

VIN ≥ VOUT(NOM) + 2.0 V

VREF

26

V

Nominal accuracy

TJ = +25°C, VIN = 9 V, IOUT = 25 mA

–1.0

+1.0

%VOUT

VOUT

VOUT(NOM) + 2.0 V ≤ VIN ≤ 24 V

(2)

Overall accuracy

–2.5

+2.5

%VOUT

100

µA ≤ IOUT ≤ 50 mA

ΔVO(ΔVI)

Line regulation

7 V

≤ VIN ≤ 28 V

0.03

%VOUT

ΔVO(ΔVL)

Load regulation

100

µA ≤ IOUT ≤ 50 mA

0.31

%VOUT

VIN = 17 V, VOUT(NOM) = 18 V, IOUT = 20 mA

290

mV

VDO

Dropout voltage

VIN = 17 V, VOUT(NOM) = 18 V, IOUT = 50 mA

0.78

1.3

V

VOUT = 90% VOUT(NOM), VIN = 7.0 V, TJ ≤ +85°C

51

117

200

mA

ILIM

Current limit

VOUT = 90% VOUT(NOM), VIN = 9.0 V

51

128

200

mA

7 V

≤ VIN ≤ 28 V, IOUT = 0 mA

25

65

μA

IGND

Ground current

IOUT = 50 mA

25

μA

ISHDN

Shutdown supply current

VEN = +0.4 V

4.1

20

μA

I FB

Feedback current(3)

–0.1

0.01

0.1

µA

IEN

Enable current

7 V

≤ VIN ≤ 28 V, VIN = VEN

0.02

1.0

μA

VEN_HI

Enable high-level voltage

1.5

VIN

V

VEN_LO

Enable low- level voltage

0

0.4

V

VIN = 12 V, VOUT(NOM) = VREF, COUT = 10 μF,

58

μVRMS

BW = 10 Hz to 100 kHz

VNOISE

Output noise voltage

VIN = 12 V, VOUT(NOM) = 5 V, COUT = 10 μF,

73

μVRMS

CBYP

(4) = 10 nF, BW = 10 Hz to 100 kHz

VIN = 12 V, VOUT(NOM) = 5 V, COUT = 10 μF,

PSRR

Power-supply rejection ratio

65

dB

CBYP

(4) = 10 nF, f = 100 Hz

Shutdown, temperature increasing

+170

°C

TSD

Thermal shutdown temperature

Reset, temperature decreasing

+150

°C

Operating junction temperature

TJ

–40

+125

°C

range

(1)

To ensure stability at no-load conditions, a current from the feedback resistive network greater than or equal to 10

μA is required.

(2)

Maximum input voltage is limited to 24 V because of the package power dissipation limitations at full load (P

≈ (VIN – VOUT) × IOUT = (24

V

– VREF) × 50 mA ≈ 1.14 W). The device is capable of sourcing a maximum current of 50mA at higher input voltages as long as the

power dissipated is within the thermal limits of the package plus any external heatsinking.

(3)

IFB > 0 flows out of the device.

(4)

CBYP refers to a bypass capacitor connected to the FB and OUT pins.

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