LP3982 datasheet(3/23 Pages) TI

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OFF

THERMAL

PROTECTION

1.25V

BANDGAP

FAST

START-UP

CIRCUIT

CURRENT

LIMIT

FAULT

COMPARATORS

VIN

SET

SHDN

FAULT

GND

ERROR

AMP

LP3982

www.ti.com

SNVS185D – FEBRUARY 2002 – REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS (continued)

Unless otherwise specified, all limits specified for VIN = VO +0.5V

(1), V

SHDN = VIN, CIN = COUT = 2.2μF, CCC = 33nF, TJ = 25°C.

Boldface limits apply for the operating temperature extremes:

−40°C and 85°C.

Symbol

Parameter

Conditions

Min(2)

Typ(3)

Max(2)

Units

VDO

Dropout Voltage(1)(4)

IOUT = 1 mA

0.4

IOUT = 200 mA

220

IOUT = 300 mA

120

ΔVO

Line Regulation

IOUT = 1 mA, (VO + 0.5V) ≤ VI ≤ 6V

(1)

−0.1

0.01

0.1

%/V

Load Regulation

100

μA ≤ IOUT ≤ 300 mA

0.002

%/mA

Output Voltage Noise

IOUT = 10 mA, 10 Hz ≤ f ≤ 100 kHz

μVRMS

Output Voltage Noise Density

10 Hz

≤ f ≤ 100 kHz, COUT = 10 μF

190

nV/

√Hz

VSHDN

SHDN Input Threshold

VIH, (VO + 0.5V) ≤ VI ≤ 6V

(1)

VIL, (VO + 0.5V) ≤ VI ≤ 6V

(1)

0.4

ISHDN

SHDN Input Bias Current

SHDN = GND or IN

0.1

100

ISET

SET Input Leakage

SET = 1.3V, Adjust Version Only(5)

0.1

2.5

VFAULT

FAULTDetection Voltage

VO ≥ 2.5V, IOUT = 200 mA

(6)

120

280

FAULT Output Low Voltage

ISINK = 2 mA

0.115

0.25

IFAULT

FAULT Off-Leakage Current

FAULT = 3.6V, SHDN = 0V

0.1

100

TSD

Thermal Shutdown Temperature

160

°C

Thermal Shutdown Hysteresis

TON

Start-Up Time

COUT = 10 μF, VO at 90% of Final

120

μs

Value

(4)

Dropout voltage is measured by reducing VIN until VO drops 100mV from its nominal value at VIN -VO = 0.5V. Dropout Voltage does not

apply to the 1.8 version.

(5)

The SET pin is not externally connected for the fixed versions.

(6)

The FAULT detection voltage is specified for the input to output voltage differential at which the FAULT pin goes active low.

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

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