Datasheet MAS9124AST3-T, MAS9124AST2-T, MAS9124AST1-T, MAS9124ASTD-T, MAS9124ASTC-T Datasheet (MAS-OY)

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DA9124.003

25 October, 2001

MAS9124

150 mA LDO Voltage Regulator IC

• Low Noise: 20 µVrms

• Low Mi ni mum Output Capacitance
Requirement: 0.22 µF

• Excellent Ripple Rejection: 65 dB

• Very Low Dropout: 70 mV

• Regulator Enable/Disable Control

• Stable with Low-ESR Output

Capacitors

DESCRIPTION

MAS9124 is a low dropout voltage regulator with an
enable/disable pin, which allows device to be turned
off or on by pulling control to low or high.
Due to the low noise level of only 20 µVrms,
MAS9124 is suitable for sensitive circuits, e.g., in
portable applications. In addition to the noise levels,
MAS9124 excels in dropout voltage (70 mV typical
at 50 mA) and rise time (16 µs typical without
bypass capacitor). Also its ripple rejection ability of
65 dB at 10 kHz exceeds that of competition.

The Equivalent Series Resistance (ESR) range of
output capacitors that can be used with MAS9124 is
very wide. This ESR range from a few m Ω up to a
couple of Ohms com bined with no minimum output
current requirement m akes the usage of MAS9124
easier and low in cost.
In order to save power the device goes into sleep
mode when the regulator is disabled. An internal
thermal protection circuit prevents the device from
overheating. Also the maximum output current is
internally limited.

FEATURES APPLICATION

• Low Noise

• Functionally and Pin Compatible with LP2985

• Can be used w/o C

BYPASS

, see p. 5

• Internal Thermal Shutdown

• Short Circuit Protection

• SOT23-5 Package

• Several Output Voltage Options Available,

see Ordering Information p. 8

• Cellular Phones

• Cordless Phones

• Accessories

• Pagers

• Battery Powered Systems

• Portable Systems

• Radio Control Systems

• Low Voltage Systems

PIN CONFIGURATION AND DESCRIPTION

Pin Name Pin Type Function

VIN 1 P Power Supply Voltage

GND 2 G Ground

CTRL 3 I Enable/Disable Pin for

Regulator

BYPASS 4 I Pin for Bypass

Capacitor

VOUT 5 O Output

Top View

G = Ground, I = Input, O = Output, P = Power

For Top Marking Information see

Ordering Information p. 8

1

2

3

5

VIN

VOUT

CTRLGND

BYPASS

24AX

4

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DA9124.003

25 October, 2001

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

All voltages with respect to ground

Parameter Symbol Conditions Min Max Unit

Supply Voltage V

IN

-0.3 6 V

Voltage Range for All Pins -0.3 V

IN

+ 0.3 V
ESD Rating HBM 2 kV
Junction Temperature T

Jmax

+175

(limited)

°C

Storage Temperature T

S

-55 +150 °C

Stresses beyond those li sted may cause permanent damage to the device. The device may not operate under these conditions, but it will
not be destroyed.

RECOMMENDED OPERATING CONDITIONS

Parameter Symbol Conditions Min Max Unit

Operating Junction
Temperature

T

J

-40 +125 °C

Operating Ambient
Temperature

T

A

-40 +85 °C

Operating Supply Voltage V

IN

2.5 5.3 V

CTRL

VIN

VOUT

GND

OVER CURRENT /

OVER TE MPERA TURE

PROTECTION

VOLTAGE

REFERENCE

+

BYPASS

160k

Ω

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DA9124.003

25 October, 2001

ELECTRICAL CHARACTERISTICS

TA = -40°C to +85°C, typical values at TA = +27°C, VIN = V

OUT(NOM)

+ 1.0 V (or min 3.8 V), I

OUT

= 1.0 mA, C

IN

= 1.0 µF, CL = 1.0 µF,

C

BYPASS

= 10 nF, V

CTRL

= VIN, unless otherwise specif i ed

◆ Thermal Protection

Parameter Symbol Conditions Min Typ Max Unit

Threshold High T

H

145 160 175 °C

Threshold Low T

L

135 150 165 °C

The hysteresis of 10°C prevents t he devi ce from turning on too soon after thermal shut-down.

◆ Control Terminal Specifications

Parameter Symbol Conditions Min Typ Max Unit

Control Voltage

OFF State
ON State

V

CTRL

−0.3

1.6

0.55

V

IN

+ 0.3

V

Control Current I

CTRL

V

CTRL

= V

IN

V

CTRL

= 0 V

5
0

10

µA

If CTRL-pin is not connected, MAS9124 is in OFF state (900 kΩ pul l -down resistor to ground).

◆ Voltage Parameters

Parameter Symbol Conditions Min Typ Max Unit

Output Voltage
Tolerance

V

OUT

I

OUT

= 0 mA

I

OUT

= 150 mA

V

OUT(NOM)

− 0.05

V

OUT(NOM) −

0.10

V

OUT(NOM)

+ 0.05

V

OUT(NOM)

+ 0.05

V

Dropout Voltage V

DROP

I

OUT

= 1 mA

I

OUT

= 50 mA

I

OUT

= 150 mA
MAS9124A4 (150 mA)
MAS9124A5 (150 mA)

1.7
70

200 320

800

1100

mV

◆ Current Parameters

Parameter Symbol Conditions Min Typ Max Unit

Continuous Output Current I

OUT

150 mA

Short Circuit Current I

MAX

RL = 0 Ω

450 675 mA

Peak Output Current I

PK

V

OUT

> 95%* V

OUT(NOM)

410 mA

Ground Pin Current I

GND

I

OUT

= 0 mA

I

OUT

= 10 mA

I

OUT

= 50 mA

I

OUT

= 150 mA

120
130
160
220

200

400

µA

Ground Pin Current, Sleep
Mode

I

GND

V

CTRL

< 0.3 V 0.01 5

µA

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DA9124.003

25 October, 2001

u Power Dissipation
Parameter Symbol Conditions Min Typ Max Unit

Junction to Case Thermal
Resistance

R

JC

81.0 °C/W

Junction to Ambient Thermal
Resistance

R

JA

255.9 °C/W

Maximum Power Dissipation P

d

any ambient temperature

JA

A

(MAX)

J

MAX

d

R

TT

P

−

=

W

Note 1

Note 1: T

J(MAX)

denotes maximum operati ng j unction temperature (+125°C), TA ambient temperature, and RJA junction-to-air thermal

resistance (+255.9°C/W).

u Line and Load Regulation
Parameter Symbol Conditions Min Typ Max Unit

Line Regulation V

OUT(NOM)

+ 1 V < V

IN

< 5.3 V,

I

OUT

= 60 mA

0.7 mV

Load Regulation

I

OUT

= 1.0 to 50 mA

I

OUT

= 1.0 to 150 mA

5

10

mV

u Noise and Ripple Rejection
Parameter Symbol Conditions Min Typ Max Unit

Output Noise Voltage V

RMS

300Hz < f < 50kHz

C

BYPASS

= 10 nF

w/o C

BYPASS

20

110

µVrms

Noise Density V

N

I

OUT

= 50 mA,

f = 1.0 kHz

100 nV

sqrt(Hz)

PSRR f = 1 kHz

f = 10 kHz

f = 100 kHz

67
65
48

dB

u Dynamic Parameters
Parameter Symbol Conditions Min Typ Max Unit

Rise Time (10%…90%) V

CTRL

= 0 to 2.4 V, I

OUT

= 30mA

C

BYPASS

= 10 nF

w/o C

BYPASS

4

16

ms

µs

Overshoot V

CTRL

= 0 to 2.4 V,

w/o C

BYPASS

310 %

Start-up Delay V

CTRL

to V

OUT

, w/o C

BYPASS

(see figure 1 below)

17

µs

Figure1. Definitions of rise
time, overshoot and start­up delay

TRL

VOUT

50%

delay
rise time

90%

10%

overshoot

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DA9124.003

25 October, 2001

APPLICATION INFORMATION

Parameter Symbol Min Max Unit Note

Output

Capacitance

Effective Series Resistance

C

L

ESR

0.22

0.01 3

µF

Ohm

1. Ceramic and film capacitors
can be used.

2. The value of C

L

should be
smaller than or equal to the
value of C

IN

.

1. When within this range, stable
with all I

OUT

= 0 mA…150 mA

values.

Bypass Capacitance
(Optional: if C

BYPASS

is not
used, noise performance and
PSRR decline, but rise time is
improved.)

C

BYPASS

Typically

0.01

µF

1. Ceramic and film capacitors are
best suited. For maximum
output voltage accuracy DC
leakage current through
capacitor should be kept as low
as possible. In any case DC
leakage current must be below
100 nA.

Input Capacitance C

IN

0.5

µF

1. A big enough input capacitance
is needed to prevent possible
impedance interactions
between the supply and
MAS9124.

2. Ceramic, tantalum, and film
capacitors can be used. If a
tantalum capacitor is used, it
should be checked that the
surge current rating is sufficient
for the application.

3. In the case that the inductance
between a battery and
MAS9124 is very small (< 0.1
µH) 0.47 µF input capacitor is
sufficient.

4. The value of C

IN

should not be

smaller than the value of C

L

.
Values given on the table are minimum requirements unless otherwise specified. When selecting capacitors,
tolerance and temperature coefficient must be considered to make sure that the requirement is met in all

potential operating conditions.

CTRL

VIN

VOUT

OVER CURRENT /

OVER TE MPER ATURE

PROTECTION

VOLTAGE

REFERENCE

+

C

BYPASS

160k

Ω

C

IN

C

L

GNDBYPASS

1

2

3

4

5

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DA9124.003

25 October, 2001

PACKAGE (SOT23_5) OUTLINE

Symbol Min Max Unit

A 0.90 1.45 mm
A1 0.00 0.15 mm
A2 0.90 1.30 mm

b 0.25 0.50 mm

C 0.09 0.20 mm

D 2.80 3.10 mm

E 2.60 3.00 mm
E1 1.50 1.75 mm

L 0.35 0.55 mm

e 0.95ref mm
e1 1.90ref mm

DATUM ’A’

A

C

L

C

L

C

L

0 - 10 degrees

0.20

2

L

E1

be

C

L

E

e1

D

A2

A1

NOTE:

1. ALL DIMENSIONS ARE IN MILLIMETERS

2. FOOT LENGHT MEASURED AT INTERCEPT POINT BETWEEN DATUM A & LEAD SURFACE.

3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLA SH & METAL BURR

4. PACKAGE OUTLINE INCLUSIVE OF SOLDER PLATING.

5. COMPLY TO EIAJ SC74

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DA9124.003

25 October, 2001

SOLDERING INFORMATION

Resistance to Soldering Heat

According to RSH test IEC 68-2-58/20 2*220°C

Maximum Reflow Temperature

235°C
Maximum Number of Reflow Cycles 2
Seating Plane Co-planarity max 0.08 mm
Lead Finish

Solder plate 7.62 - 25.4 µm, material Sn 85% Pb 15%

TAPE & REEL SPECIFICATIONS

Other Dimensions according to EIA-481 Standard.

3000 Components on Each Reel.

Dimension Min Max Unit

A 178 mm
B1.5 mm
C 12.80 13.50 mm
D 20.2 mm
N50 mm

W

1

(measured at hub) 8.4 9.9 mm

W

2

(measured at hub) 14.4 mm

Trailer 160 mm

Leader 390,

of which minimum 160

mm of empty carrier tape

sealed with cover tape

mm

Feeding Direction

8 mm

4 mm

A

B

D

W3

W2

C

W1

N

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DA9124.003

25 October, 2001

ORDERING INFORMATION

Product Code Product Top Marking Package Comments

MAS9124AST5-T 1.50 V Voltage Regulator IC 24A5 SOT23-5 Tape and Reel
MAS9124AST4-T 1.80 V Voltage Regulator IC 24A4 SOT23-5 Tape and Reel
MAS9124ASTA-T 2.30 V Voltage Regulator IC 24AA SOT23-5 Tape and Reel
MAS9124ASTB-T 2.40 V Voltage Regulator IC 24AB SOT23-5 Tape and Reel
MAS9124AST3-T 2.50 V Voltage Regulator IC 24A3 SOT23-5 Tape and Reel
MAS9124ASTC-T 2.60 V Voltage Regulator IC 24AC SOT23-5 Tape and Reel
MAS9124AST9-T 2.70 V Voltage Regulator IC 24A9 SOT23-5 Tape and Reel
MAS9124AST2-T 2.80 V Voltage Regulator IC 24A2 SOT23-5 Tape and Reel
MAS9124AST8-T 2.86 V Voltage Regulator IC 24A8 SOT23-5 Tape and Reel
MAS9124AST7-T 2.90 V Voltage Regulator IC 24A7 SOT23-5 Tape and Reel
MAS9124AST6-T 3.00 V Voltage Regulator IC 24A6 SOT23-5 Tape and Reel
MAS9124ASTD-T 3.10 V Voltage Regulator IC 24AD SOT23-5 Tape and Reel
MAS9124AST1-T 3.30 V Voltage Regulator IC 24A1 SOT23-5 Tape and Reel

For more voltage options contact Micro Analog Systems Oy.

LOCAL DISTRIBUTOR

MICRO ANALOG SYSTEMS OY CONTACTS

Micro Analog Systems Oy
Kamreerintie 2, P.O.Box 51
FIN-02771 Espoo, FINLAND
Http://www.mas-oy.com

Tel. [phone]
Tel. Int. [phone]
Telefax [phone]
E-mail: [e-mail]

NOTICE

Micro Analog Systems Oy reserves the right to make changes to the product s c ontai ned in thi s dat a sheet in order t o im prove the des ign or
performance and to supply the best poss ible products. Micro Analog Systems Oy assum es no responsibility for the use of any circuits
shown in this data sheet, conveys no license under any pat ent or other rights unl ess otherwise spec ified in thi s data sheet, and makes no
claim that the circ uits are free from patent infringement. Applic ations for any devices s hown in this data sheet are for illustration only and
Micro Analog Systems Oy mak es no claim or warranty that such applic ations will be suitable for t he use spec ified without further t esting or
modification.