Microsemi LX8221 Technical data

查询LX8221供应商

TM

The LX8221 family of dual output
linear regulators provide for the
selection of either fixed or adjustable
output voltages, and combine low
dropout operation, fast transient
performance, tight output voltage
accuracy, and ultra-low ground current
within a very small package footprint.

The PMOS output transistor allows
for an ultra-low dropout characteristic
(e.g., typically less than 175mV at
100mA). The individual regulators can
be powered from either separate supply
voltages or the same supply voltage
between 2.8V to 6V allowing for
maximum system flexibility.

An optional ceramic or tantalum type
capacitor may be connected to each
Bypass pin separately to improve
performance in critical low-noise
applications.

IMPORTANT: For the most current data, consult MICRO Semi’s website: http://www.microsemi.com

5.0V

3.3V

VIN2

VIN1

CB1

DESCRIPTION

Overall regulator efficiency has been

improved with a minimized operating
ground current (typ < 140µA per
regulator). Further, this ground current
is virtually eliminated in shutdown mode
(typ < 1µA).

Other safety features include channel
independent Thermal and Short Circuit
Current protection.

Separate Enable pins allow each
regulator to be switched on and off
independently by applying a TTL logic
level control signal to the Enable pin
further enhancing system level power
management.

These features combined with a small
footprint (i.e., 10-pin MSOP package)
make the LX8221 especially useful for
battery-operated equipment such as
cellular telephones, laptop computers
and PDA equipment.

PRODUCT HIGHLIGHT

N/C

EN1

EN2

VOUT1

To Control Logic

}

Off

LX8221

®

Dual 150mA CMOS Low Dropout Regulator

KEY FEATURES

 Compact regulators with

two 150 mA outputs

 Dropout Voltage typically

175mV @ 100mA

 Ultra low shutdown Current

typically less than 1µA

 Output trimmed to 0.5%
 Small MSOP-10 package
 Over Current &

Temperature protection

 Stable with ceramic or

tantalum capacitors

WWW.Microsemi .COM

APPLICATIONS

 Battery Operated Systems
 Laptop, Notebook and PDA’s
 Cellular Telephones/pagers
 Instrumentation
 Linear post regulators for

N/C

SMPS

EN1

EN2

VOUT1

To Control Logic

}

Off

On

5.0V

On

3.3V

VIN2

VIN1

ADJ1

Copyright © 2000
Rev. 1.0a, 2005-03-03

ADJ

Fixed / Adjustable Application

TJ (°C)

VOUT2

GND

R1

R2

PACKAGE ORDER INFO

VOUT1 VOUT2

-40 to 125 Adjustable Adjustable

-40 to 125 2.5V Adjustable

-40 to 125 2.7V Adjustable

-40 to 125 3.0V Adjustable

Note: Available in Tape & Reel. Append the letter “T” to the part number. (i.e. LX8221AIDU-TR)

Contact Microsemi for additional / available options

Microsemi

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Linfinity Microelectronics Division

VOUT2

GND

Package Marking

8221 AIDU LX

8221 BIDU LX
8221 DIDU LX

8221 GIDU LX

R1

R2

L

L

X

X

8

8

2

2

2

2

1

1

ADJ2

R1R2

Plastic MSOP 10-Pin

DU

RoHS Compliant / Pb-free
Transition D/C: 0432

Adjustable / Adjustable Application

LX8221AIDU

LX8221BIDU
LX8221DIDU
LX8221GIDU

Page 1

TM

Input Voltage (VIN1, VIN2).......................................................................... -0.3V to +7V

Output Current (I

Operating Temperature Range .....................................................................-40 to +125 °C

Maximum Junction Temperature (T
Storage Temperature (T

Peak Package Solder Reflow Temp. (40 second max. exposure)................. 260°C (+0, -5)

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.

ABSOLUTE MAXIMUM RATINGS

, I

OUT1

)................................................................................. 150mA

OUT2

) ......................................................................150 °C

) .............................................................................-65 to +150 °C

J

J

®

Dual 150mA CMOS Low Dropout Regulator

VOUT1

VOUT1/VOUT2 Regulated output voltage. Regulator stability is achieved with external capacitor of 1uF

Plastic MSOP 8-Pin

DU

THERMAL RESISTANCE-JUNCTION TO AMBIENT,
THERMAL RESISTANCE-JUNCTION TO CASE,

Junction Temperature Calculation: TJ = TA + (PD x θ

numbers are guidelines for the thermal performance of the device/pc-board

The θ

JA

system. All of the above assume no ambient airflow.

P

IN NAME

VIN1/VIN2 Unregulated input supply voltage

GND Ground Pin

EN1/EN2 Enable control input: Logic high = Enable; logic low or open = Shutdown

ADJ (1, 2) Adjust pin. Connect a resistor divider to this pin to establish preferred output voltage.

D

CB1 Reference bypass input. Adding an additional external capacitor reduces output noise.

THERMAL DATA

θ

JC

).

JC

FUNCTIONAL PIN DESCRIPTION

θ

JA

206°C/W

39°C/W

ESCRIPTION

LX8221

PACKAGE PIN OUT

1

CB1

NC

EN2

VIN2

RoHS / Pb-free 100% Matte Tin Lead Finish

2

3

4
56

DU

(Top View)

“NC” = No Internal Connection

FRONT MARKING

8221

xIDU

x = Voltage Combination

i.e. A = Adj/Adj

PACKAGE

LX

10

9

8

7

WWW.Microsemi .COM

VIN1

EN1

GND

ADJ
VOUT2

Copyright © 2000
Rev. 1.0a, 2005-03-03

Microsemi

Linfinity Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Page 2

P

P

A

A

C

C

K

K

A

A

G

G

E

E

D

D

A

A

T

T

A

A

(

)

TM

VOUT1

THERMAL

CB1

GND

SENSOR

+

-

VREF

CONTROL

LOGIC

CURRENT

LIMIT

®

Dual 150mA CMOS Low Dropout Regulator

BLOCK DIAGRAM

VIN1

EN1

EN2

VIN2

CURRENT

LIMIT

THERMAL

SENSOR

CONTROL

LOGIC

Parameter Symbol

Input Operating Voltage Range (Note 1) VIN1, VIN2 2.5 6 V
Enable Input Voltage Range EN1/2 VIN + 0.3V V
Continuous Output Current Range I
Input Capacitor (VIN to GND) CIN 1.0* µF
Output Capacitor (V

Note 1: The minimum VIN has to meet two conditions V
* Size your output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR and larger value capacitor will improve the response to
these load steps.

OUT

RECOMMENDED OPERATING CONDITIONS

OUT1, IOUT

to GND) C

> 2.5V and V

IN

> V

+ V

IN

OUT

DROPOUT

.

OUT

LX8221

Min Typ Max

150 mA

1

1.0* 2.2 µF

Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C≤ T

where otherwise noted. Test conditions: V

testing methods.

Parameter Symbol Test Conditions

Output Voltage (2.5, 2.7, 3.0, ADJ) VOUT1/2

Adjust Reference Voltage V

V

Line Regulation

Load Regulation

∆

⎛

O

⎜
⎝

V

∆

⎛
⎜
⎝

⎞
⎟

V

∆

IN

⎠

⎞

O

⎟

I

∆

O

⎠

Dropout Voltage

(Note 2)

VV −

OIN

Ground Pin Current

ELECTRICAL CHARACTERISTICS

= V

IN

+ 0.5V; I

OUT

TJ = 25°C -1 1
0mA

≤

TJ = 25°C 1.163 1.187

ADJ

0mA

I

≤

V

(V

RV

OUT1/2

TJ = 25°C, 0.5mA≤I

V

RI

0.5mA
I

LOAD1/2

I

= 50mA, ∆VO = -1%

LOAD1/2

V

DO

I

= 100mA, ∆VO = -1%

LOAD1/2

I

= 150mA, ∆VO = -1%

I

I

STBY

GND

LOAD1/2

EN1 = High, EN2 = High 280 440

EN1 = Low, EN2 = Low 1

=10mA; CIN = 1µF; C

OUT

I

150mA, (V

≤

OUT1/2

150mA, 2.85V≤V

≤

OUT1/2

+ 0.5V)≤V

I

≤

OUT1/2

100mA

≤

IN

6V, I

≤

OUT1/2

= 1mA, ∆VO = -1%

OUT1/2

OUT1/2

150mA

≤

OUT

+ 0.5V)≤V

6V

≤

IN

= 0.1mA

= 1µF; TJ = T

Min Typ Max

6V

≤

IN

-2.5 2.5

1.140

0.04 0.15 %/V

0.5

1.5

0.050

0.175

0.175 0.3

0.25 0.4

LX8221

VOUT2

+

-

VREF

≤

125°C except

using low duty cycle pulse

A

A

LX1742

1.175

1.210

ADJ

Units

Units

%V

µA

WWW.Microsemi .COM

%

V

NOM

V

Copyright © 2000
Rev. 1.0a, 2005-03-03

Microsemi

Linfinity Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Page 3