LND2931-12 - Linear Dimensions Semiconductor

LND2931

100mA Low Dropout Voltage Regulator

DATA

SHEET

GENERAL DESCRIPTION

• 3- terminal regulators ( To-220-5, SO-8

for LND2931)

• 100mA output within 2% over

temperature

• Very low quiescent current

• Low dropout voltage (300mV Typ)

• Extremely tight load and line regulation

• Very low temperature coefficient

• Current and thermal limiting

• Unregulated DC input can withstand

–20V reverse battery and +60V positive

transients

• Direct replacement for National

LM2931 fixed series, but has lower

ground current, higher accuracy of

output voltage and extremely tight load

and line regulation. For adjust model

LND2931 see typical applications on

figure 2.

FEATURES

This series of fixed-voltage and adjustable

monolithic micropower voltage regulators is

designed for a wide range of applications. This

device is an excellent choice for use in battery-

powered application. Furthermore, the

quiescent current increases only slightly at

dropout, which prolongs battery life. This series

of fixed-voltage ( Typ. 60mV at light load and

300mV at 100mV) includes a tight initial

tolerance of 0.5% typ., extremely good load and

line regulation of 0.05% typ., and very low output

temperature coefficient. This series of fixed-

voltage and adjustable regulators is offered in 3-

pin TO-92 package (TO-220-5, SO-8 for

LND2931) compatible with other fixed-voltage

regulators.

APPLICATIONS

• High-efficiency linear regulators

• Battery powered systems

• Portable/Palm top/ Notebook

Computers

• Portable consumer equipment

• Portable instrumentation

• Automotive Electronics

• SMPS Post Regulator

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

PIN CONFIGURATION

Output

Shutdown

GND

Feedback

Input

LND2931

GND

GND GND

Power Dissipation Internally Limited

Lead Temperature(Soldering, 5 seconds) 260ºC

Storage Temperature Range -65ºC to +150ºC

Operating Junction Temperature Range -55ºC to +150ºC

Input Supply Voltage -20V to +35V

Vout , VOLTS Device

3.3V* LND2931-3.3

5.0V LND2931-5.0

8.0V LND2931-8.0

8.5V LND2931-8.5

9.0V LND2931-9.0

10.0V LND2931-10

12.0V LND2931-12

15.0V LND2931-15

3.0v to 24V LND2931

* Other fixed versions are also available, VOUT =2.0V to 5.0V. Please consult for more information.

ABSOLUTE MAXIMUM RATINGS

LND2931

DEVICE SELECTION GUIDE

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

OUTPUT

GND

INPUT

TO-92

(Bottom View)

TO-220

INPUT

OUTPUT

GND

(Top View)

(TJ =25ºC, IO =100µA, VIN =14V (for 2931-15, VIN =16V), CO =100µF; unless otherwise noted)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Voltage

(Fixed Model)

-25º C≤TJ≤ 85ºC

Full Operating Temperature

0.985 |VO|

0.98 |VO|VO

1.015|VO|

1.02 |VO|

Output Voltage

(Fixed Model) 100µA≤IL≤ 100mA, TJ≤Tjmax 0.975 |VO|V

O1.025 |VO|

Input Supply Voltage 26

Output Voltage

Temperature Coefficient (Note 1) 50 150 ppm/ºC

Line Regulation (Note 2) 13V ≤ Vin ≤ 26V (Note 3) 0.1 0.4 %

Load Regulation(Note 2) 1mA≤ IL ≤ 100mA 0.1 0.3 %

Dropout Voltage(Note 4) IL =10mA

IL =100mA

300

200

600 mV

Ground Current (Note 5)

IL =100µA

IL =10mA

IL =100mA

100

0.9

150

1.5

µA

Dropout Ground Current

(Note 5) Vin=Vout -0.5V , IL =100µA 110 170 µA

Current Limit Vout=0 160 200 mA

Thermal Regulation(Note6) 0.05 0.2 % / W

Output Noise, 10Hz to

100KHz IL = 100mA

CL=2.2µF

CL=3.3µF

CL=33µF

500

350

120

µV RMS

Ripple Rejection Ratio IO =10mA,f=120Hz,Co=100µF,

Vin=Vo+3V+2Vpp 60 dB

TO-220-5, SO-8 Versions Only

Reference Voltage 1.21 1.235 1.26

Reference Voltage Over Temperature (note 7) 1.185 1.285 V

Feedback Pin Bias Current 20 40 nA

Reference Voltage

Temperature Coefficient (Note 1) 50 ppm/ºC

Feedback Pin Bias Current

Temperature Coefficient 0.1 nA/ºC

Shutdown Input

Input Logic Voltage Low(Regulator ON)

High (Regulator OFF) 2

1.3 0.7 V

Shutdown Pin Input

Current

VS = 2.4V

VS = 26V

450

600

(Note 8)

5.0V ≤Vout <15.0V 10

3.3V ≤Vout <5.0 V 20

Regulator Output Current

in Shutdown

2.0V ≤Vout <3.3V 30

µA

ELECTRICAL CHARACTERISTICS

LND2931

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change

divided by the total temperature range.

Note 2: Regulations are measured at constant junction temperature, using pulse testing with a low duty

cycle. Changes in output voltage due to heating effects are covered under the specification for thermal

regulation.

Note 3: Line regulation is tested at 150ºC for IL = 1mA, for IL=100µA and TJ =125ºC, line regulation is

guaranteed by design to 0.2%. For LND2931-15 16V<= Vin <=26V.

Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 2%

below its nominal value measured at 1V differential.

Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is

the sum of the ground pin current and output load current.

Note 6: Thermal regulation is the change in output voltage at a time T after a change in power dissipation,

excluding load or line regulation effects. Specifications are for a 50mA load pulse (1.25W pulse) for

T=10ms.

Note7: Vref ≤ Vout ≤ (Vin-1V), 2.3V≤Vin ≤ 26V, 100µA ≤IL ≤ 100mA, TJ ≤ Tjmax.

Note 8: Vshutdown ≥ 2V, VIN ≤ 26V, Vout =0V.

LND2931

BLOCK DIAGRAM AND TYPICAL APPLICATIONS

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

OUTPUT

1.23 V

Reference

INPUT

GROUND

Unregulated DC

I <= 100mA

See

Application

Hints

ERROR

AMPLIFIER

+60k

182k

Figure 1: Fixed Regulator

Vout 1.2A->24A

Unregulated DC

From

CMOS

TTL

3.3 F

SHUTDOWN

ERROR

AMPLIFIER

60k

2,3,6,7

FEEDBACK

INPUT

GROUND

OUTPUT

1.23 V

Reference

I <= 100mA

0.01 F

Figure 2:Adjustable Regulator

LND2931

TYPICAL APPLICATIONS

Wide Input Voltage Range Current Limiter 5V Current Limiter

Latch Off When Error Flag Occurs Low Drift Current Source

ERROR

LND2931

ERROR IN

SHUTDOWN

OUT

*Minimum input-output voltage ranges from

40mV to 400mV, depending on load current.

Current limit is typically 160mA.

OUT

GND

IN *V

INPUT

OUTPUT

*Minimum input-output voltage ranges from

40mV to 400mV, depending on load current.

Current limit is typically 160mA.

GND

LND2931

5V BUS

1 F

OUT

Ω

GND

1 F

OUT

Ω

470k

1VOUT

ERROR V

LND2931

470k

RESET

+V=

SHUTDOWN

LOAD

LND2931

= 1.23/R

OUT

1.2 30V

1 F

IN OUT

INPUT

1 F

FBGND

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •