NSC LP3982ILD-3.0, LP3982ILD-2.82, LP3982ILD-2.77, LP3982ILD-1.8, LP3982IMMX-3.0 Datasheet

July 2002

LP3982

Micropower, Ultra Low-Dropout, Low-Noise, 300mA

CMOS Regulator

General Description

The LP3982 low-dropout (LDO) CMOS linear regulator is available in 1.8V, 2.5V, 2.77V, 2.82V, 3.0V, 3.3V, and adjustable versions. They deliver 300mA of output current. Packaged in an 8-Pin MSOP, the LP3982 is pin and package compatible with Maxim’s MAX8860. The LM3982 is also available in the small footprint LLP package.

The LP3982 suits battery powered applications because of its shutdown mode (1nA typ), low quiescent current (90µA typ), and LDO voltage (120mV typ). The low dropout voltage allows for more utilization of a battery’s available energy by operating closer to its end-of-life voltage. The LP3982’s PMOS output transistor consumes relatively no drive current compared to PNP LDO regulators.

This PMOS regulator is stable with small ceramic capacitive loads (2.2µF typ).

These devices also include regulation fault detection, a bandgap voltage reference, constant current limiting and thermal overload protection.

Features

nMAX8860 pin, package and spec. compatible

nLLP space saving package

n300mA guaranteed output current

n120mV typical dropout @ 300mA

n90µA typical quiescent current

n1nA typical shutdown mode

n60dB typical PSRR

n2.5V to 6V input range

n120µs typical turn-on time

nStable with small ceramic output capacitors

n37µV RMS output voltage noise (10Hz to 100kHz)

nOver temperature/over current protection

n±2% output voltage tolerance

Applications

nWireless handsets

nDSP core power

nBattery powered electronics

nPortable information appliances

Application Circuit

20036931

Regulator CMOS 300mA Noise,-Low Dropout,-Low Ultra Micropower, LP3982

© 2002 National Semiconductor Corporation

DS200369

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LP3982

Absolute Maximum Ratings (Notes 1,

2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

VIN, VOUT, VSHDN, VSET, VCC,
V	FAULT		−0.3V to 6.5V
Fault Sink Current			20mA
Power Dissipation			(Note 3)
Storage Temperature Range			−65˚C to 160˚C
Junction Temperature (TJ)			150˚C
Lead Temperature (10 sec.)			260˚C

ESD Rating
Human Body Model (Note 6)	2kV
Machine Model	200V
Thermal Resistance (θJA)
8-Pin MSOP	223˚C/W
8-Pin LLP	(Note 3)

Operating Ratings(Note 1), (Note 2)

Temperature Range	−40˚C to 85˚C
Supply Voltage	2.5V to 6.0V

Electrical Characteristics

Unless otherwise specified, all limits guaranteed for VIN = VO +0.5V (Note 7), VSHDN = 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

Typ

Max

Units

(Note 5)

(Note 4)

(Note 5)

VIN

Input Voltage

2.5

6.0

V

∆VO

Output Voltage Tolerance

100µA ≤ IOUT ≤ 300mA

−2

+2

VIN = VO +0.5V, (Note 7)

% of

SET = OUT for the Adjust

−3

+3

VOUT (NOM)

Versions

VO

Output Adjust Range

Adjust Version Only

1.25

6

V

IO

Maximum Output Current

Average DC Current Rating

300

mA

ILIMIT

Output Current Limit

330

770

mA

IQ

Supply Current

IOUT = 0mA

90

270

µA

IOUT = 300mA

225

Shutdown Supply Current

VO = 0V,

SHDN

= GND

0.001

1

µA

VDO

Dropout Voltage

IOUT = 1mA

0.4

(Note 7), (Note 8)

IOUT = 200mA

80

220

mV

IOUT = 300mA

120

∆VO

Line Regulation

IOUT = 1mA, (VO + 0.5V) ≤ VI ≤ 6V

−0.1

0.01

0.1

%/V

(Note 7)

Load Regulation

100µA ≤ IOUT ≤ 300mA

0.002

%/mA

en

Output Voltage Noise

IOUT = 10mA, 10Hz ≤ f ≤ 100kHz

37

µVRMS

Output Voltage Noise Density

10Hz ≤ f ≤ 100kHz, COUT = 10µF

190

nV/

V

VIH, (VO + 0.5V) ≤ VI ≤ 6V

2

SHDN

Input Threshold

SHDN

(Note 7)

V

VIL, (VO + 0.5V) ≤ VI ≤ 6V

0.4

(Note 7)

I

= GND or IN

0.1

100

nA

SHDN

Input Bias Current

SHDN

SHDN

ISET

SET Input Leakage

SET = 1.3V, Adjust Version Only

0.1

2.5

nA

(Note 9)

VO ≥ 2.5V, IOUT = 200mA

120

280

mV

V

FAULT

FAULTDetection Voltage

(Note 10)

ISINK = 2mA

0.115

0.25

V

FAULT

Output Low Voltage

I

FAULT

FAULT

Off-Leakage Current

FAULT

= 3.6V,

SHDN

= 0V

0.1

100

nA

TSD

Thermal Shutdown

160

Temperature

˚C

Thermal Shutdown Hysteresis

10

TON

Start-Up Time

COUT = 10µF, VO at 90% of Final

120

µs

Value

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Electrical Characteristics (Continued)

Note 1: Absolute Maximum ratings indicate limits beyond which damage may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions.

Note 2: All voltages are with respect to the potential at the ground pin.

Note 3: Maximum Power dissipation for the device is calculated using the following equations:

where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. E.g. for the MSOP-8 package θJA = 223˚C/W, TJ(MAX) = 150˚C and using TA = 25˚C, the maximum power dissipation is found to be 561mW. The derating factor (−1/θJA) = −4.5mW/˚C, thus below 25˚C the power dissipation figure can be increased by 4.5mW per degree, and similarity decreased by this factor for temperatures above 25˚C. The value

of the θJA for the LLP package is specifically dependent on the PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187.

Note 4: Typical Values represent the most likely parametric norm.

Note 5: All limits are guaranteed by testing or statistical analysis.

Note 6: Human body model: 1.5kΩ in series with 100pF.

Note 7: Condition does not apply to input voltages below 2.5V since this is the minimum input operating voltage.

Note 8: 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.

Note 9: The SET pin is not externally connected for the fixed versions.

Note 10: The FAULT detection voltage is specified for the input to output voltage differential at which the FAULT pin goes active low.

Functional Block Diagram

20036913

LP3982

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LP3982

Typical Performance Characteristics Unless otherwise specified, VIN = VO + 0.5V, CIN = COUT = 2.2µF, CCC = 33nF, TJ = 25˚C, VSHDN = VIN.

Dropout Voltage vs. Load Current	Dropout Voltage vs. Load Current
(For Different Output Voltages)	(For Different Output Temperatures)

20036903		20036927
	Detect Threshold vs. Load Current	Supply Current vs. Input Voltage
FAULT

	20036928
	20036929
Supply Current vs. Load Current	Power Supply Rejection Ratio vs. Frequency

20036930

20036904

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