Datasheet AMS5105 Datasheet (Advanced Monolithic Systems)

http://www.BDTIC.com/AMS

Advanced AMS5105

Monolithic 500mA CMOS LOW DROPOUT VOLTAGE REGULATOR
Systems

RoHS compliant

FEATURES APPLICATIONS

• Fixed and Adjustable Versions Available • Cellular Telephones

• Output Current up to 500mA • Portable Consumer Equipment

• Very Low Quiescent Current • Portable (Notebook) Computers

• Input-output Differential less than 0.5V • Battery Powered Systems

• Short Circuit Protection • Portable Instrumentation

• Internal Thermal Overload Protection • Radio Control Systems

• ENABLE Pin available in selected packages • CD/DVD drives

GENERAL DESCRIPTION

The AMS5105 series consists of positive fixed and adjustable voltage regulators ideally suited for use in battery-powered
systems. These devices feature very low quiescent current (500uA or less) when supplying loads up to 500mA, and a standby
current less than 500nA when disabled using the ENABLE pin (available in selected packages). These unique characteristics
and the low input-output differential required for proper regulation (0.5V for output currents of 500mA) make the AMS5105
ideal for use in standby power systems. Internal current limiting and thermal shutdown features provide protection for all
AMS5105 series devices regardless of package type. The AMS5105 is offered as fixed voltage regulators in the 5 lead SOT-23,
SOT-89, SOT-223, and 8 lead SOIC packages, and as adjustable voltage regulators in the 5 lead SOT-23 and 8 lead SOIC
packages. All devices in the 5 lead SOT-23 and 8 lead SOIC packages are provided with ENABLE pin.

ORDERING INFORMATION

OUTPUT PACKAGE TYPE TEMP.

VOLTAGE

5L SOT-23 SOT-89 SOT-223 SO-8

FIXED AMS5105M1-X AMS5105L-X AMS5105-X AMS5105S-X -25C to 125C

ADJUSTABLE AMS5105M1 AMS5105S -25C to 125C

X = 1.5V, 1.8V, 2.5V, 2.8V, 3.3V.

PIN CONNECTIONS

5 Lead SOT-23

(M1)

V

GROUND

ENABLE

1

IN

2

3

5

V

OUT

FB

4

N/C

Top View Top View Top View Top View

V

OUT

SOT-89

(L)

123

GND

V

IN

V

OUT

SOT-223

123

GND

V

RANGE

8 Lead SOIC

(S)

V

1

OUT

2

GROUND

3

IN

GROUND

FB

N/C

4

V

8

7

GROUND

GROUND

6

ENABLE

5

IN

N/C

Advanced Monolithic Systems, Inc.

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AMS5105

ABSOLUTE MAXIMUM RATINGS

Input Supply Voltage -0.3 to +6.5V Maximum Junction Temperature
Internal Power Dissipation (Note 4) Internally Limited Storage Temperature
ESD 2000V Lead Temperature (Soldering 25 sec)

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at V

PARAMETER

Fixed Output Voltage Versions

Output Voltage Tolerance -1.5 +1.5 %

Line Regulation

Load Regulation

Dropout Voltage

Quiescent Current

Maximum Operational Input
Voltage

ENABLE Threshold Voltage

Enabled

Disabled

ENABLE Threshold Current V

Wake-Up Response Time

(from disabled state)

IN =VOUT

(V

+1V) ≤ VIN ≤6V, I

OUT

-25°C ≤T

(V

+1V) ≤VIN ≤ 6V

IN

1mA ≤I

5mA ≤ I

= 10 mA

I

OUT

I

= 100 mA

OUT

= 500 mA

I

OUT

= 10 mA

I

OUT

= 100 mA

I

OUT

I

= 500 mA

OUT

R

= 500Ω, In disabled state, V

L

6 V

VIN = 3V to 6V (Note 6)

ENABLE

(Note 7) - 20 30

(Note 1)

+125°C

-65°C to +150°C

+1V, I

CONDITIONS

≤125°C

J

≤ 100 mA

OUT

≤ 500 mA

OUT

= 0.6 x VIN, VIN = 3V to 6V 0.01 1 nA

=1mA, TJ=25°C, C

OUT

=100 mA

OUT

ENABLE

= 0

= 2.2µF unless otherwise specified.

OUT

AMS5105-X

Min. Typ. Max.

- 3.0

30

60

5

8

50

20

100

400

450

450

450

100

-

-

+ 3.0

10

30

50

70

25

125

500

550

550

550

500

15

Units

%

mV/V

mV/V

mV

mV

mV

mV

mV

µA

µA

µA

nA

% V

% V

µs

265°C

IN

IN

Advanced Monolithic Systems, Inc.

http://www.BDTIC.com/AMS

AMS5105

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at V

PARAMETER

Adjustable Version

Reference Voltage

Output Voltage Range 1.25 - 5 V

Line Regulation

Load Regulation

Dropout Voltage

Quiescent Current

Maximum Operational Input
Voltage

ENABLE Threshold Voltage

Enabled

Disabled

ENABLE Threshold Current V

Wake-Up Response Time

(from disabled state)

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test
conditions, see the Electrical Characteristics tables.

Note 2: To ensure constant junction temperature, low duty cycle pulse testing is used.
Note 3: Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for

T

= TJ = 25°C.

A

Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature T
and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is calculated using:

P(MAX)

Where the values of the junction-to-ambient thermal resistances are as follows: 220°C/W for 5 lead SOT-23 (M1) and 160°C/W for the molded plastic SO-8 (S).
Note 5: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V
differential.

Note 6:

ENABLE Threshold Voltage levels are specified as a percentage of input voltage V

equal to V
Note 7: Time required for V

.

IN

OUT

IN

=6V, V

OUT

=3V, I

=1mA, TJ=25°C, C

OUT

CONDITIONS

(Note 2)

= 2.2µF unless otherwise specified.

OUT

Min.

AMS5105

Typ.

Max.

Units

1.231 1.250 1.269 V
≤ 100 mA, -25°C ≤T

I

OUT

Measured from FB pin to

+ 1V ≤VIN ≤ 6V

V

OUT

1mA ≤I

5mA ≤I

I

I

I

I

I

I

R

≤ 100 mA

O

≤ 500 mA

O

≤ 10 mA

OUT

= 100 mA

OUT

= 500 mA (Note 5)

OUT

= 10 mA

OUT

= 100 mA

OUT

= 500 mA

OUT

= 500Ω, In disabled state, V

L

V

= 3V to 6V (Note 6)

IN

= 0.6 x VIN, VIN = 3V to 6V 0.01 1 nA

ENABLE

(Note 7) - 20 30

≤ 125°C

J

GROUND

ENABLE

= 0

1.218 1.250 1.282

V

- 1.5 %

0.3 1 1

20

100

400

350

350

350

100

25

125

500

450

450

450

500

2

%

%

mV

mV

mV

µA

µA

µA

nA

6 V

60

-

-

-

-

15

% V

% V

IN

IN

µs

(MAX), the junction-to ambient thermal resistance θ

J

AJ

=

θ

to reach 95% of output voltage setting after V

T-(MAX)T

Aθ-J

. Quiescent current can be minimized by choosing V

IN

is switched from 0V to V

ENABLE

.

IN

ENABLE

HIGH

J-A

Advanced Monolithic Systems, Inc.

http://www.BDTIC.com/AMS

TYPICAL PERFORMANCE CHARACTERISTICS

AMS5105

Advanced Monolithic Systems, Inc.

http://www.BDTIC.com/AMS

AMS5105

AMS5105/-X Pin Description 5-Lead SOT-23
PIN NAME DESCRIPTION
1 VIN Unregulated input voltage

Connect C

2 GND Ground connection for VIN

and V

3 ENABLE Logical high enables regulator

Logical low disables regulator

4 FB Feedback from resistor divider

Used to set output voltage
Adjustable versions only
(See Figures 3 and 4)

5 V

Regulated output voltage

OUT

Connect C
GND

from VIN to GND

IN

OUT

from V

OUT

OUT

to

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APPLICATION NOTES

Definition of Terms

Dropout Voltage

the circuit stops to regulate against further reduction in input
voltage. Measured when the output voltage has dropped 100mV
from the nominal voltage obtained at 1V input, dropout voltage is
dependent upon load current and junction temperature.

Input Voltage: The DC voltage applied to the input terminal with

respect to ground.

Input-Output Differential: The voltage difference between the

unregulated input voltage and the regulated output voltage for
which the regulator will regulate.

Line Regulation: The change in output voltage for a change in

the input voltage. The line regulation is measured under conditions
of low dissipation or by using low duty cycle pulse testing such
that the average chip temperature is not significantly affected.

Load Regulation: The change in output voltage for a change in

load current at constant chip temperature.

Long term stability: Output voltage stability under accelerated

life-test conditions after 1000 hours with maximum rated voltage
and junction temperature.

Quiescent Current: That part of the positive input current that

does not contribute to the positive load current. The regulator
ground lead current.

Temperature Stability of V

voltage for a thermal variation from room temperature to either
temperature extreme.

External capacitor

The AMS5105 series requires an output capacitor of 2.2µF or
greater to ensure device stability, as shown in Figures 1 through 4.
Without the capacitor the device may oscillate. Most types of
tantalum or electrolytic capacitor can be used in the applications.
The value of this capacitor can be increased without limits. For

: The input-output voltage differential at which

: The percentage change in output

O

AMS5105

higher loads, the value of the capacitor should be increased,
especially when the output voltage is set for 2.5V or less. The
AMS5105 lowest fixed output voltage value is 1.5V.

Programming the Output Voltage

The AMS5105 may be programmed for any output voltage
between its 1.25V reference and its 6V maximum rating, allowing
for dropout and power dissipation. As shown in Figure 3, an
external pair of resistors is required.
The equation for the output voltage is:

VOUT = VREF ⋅ (1 + R1/ R2)

where V

Typical application circuit (adjustable output)

REF is the nominal 1.25 reference voltage.

TYPICAL APPLICATION

+V

IN

+

2.2 F

C

IN

3

+V

IN

V

AMS5105-X

GND

2

OUT

V

OUT

1

2.2 F

+

C

OUT

Figure 1

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+

2.2 F
C

IN

3

ENABLE

GND

Figure 2

+V

IN

1

+V

IN

V

AMS5105-X

2

OUT

+V

IN

2.2 F

V

5

OUT

2.2

F

+

C

OUT

+

C

IN

3

Figure 3

1

+V

IN

AMS5105

ENABLE

GND FB

V

+

OUT

2.2 F

C

OUT

5

V

OUT

R

1

42

1.25V

R

V

REF

2

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PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.

5 LEAD SOT-23 PLASTIC PACKAGE (M1)

0.110-0.120

(2.794-3.048)

0.102-0.118

(2.60-3.00)

0.059-0.070

(1.50-1.75)

AMS5105

0.155-0.167
(3.94-4.25)

0.090-0.102

(2.29-2.60)

0.018-0.024
(0.457-0.610)

0.036-0.051

(0.090-1.30)

0.003
(0.150)
MAX

0.037
(0.95)
TYP

0.173-0.181
(4.40-4.60)

0.064-0.072
(1.62-1.83)

0.014-0.020

(0.350-0.50)

10°

NOM

0.075
(1.90)
TYP

10°

NOM

SOT-89 PLASTIC PACKAGE (L)

0.055-0.063
(1.40-1.60)

0.084-0.090
(2.13-2.29)

0.018-0.024
(0.457-0.610)

0.014-0.017
(0.35-0.44)

0.0035-0.0080
(0.090-0.20)

(SOT-23-5 ) AMS DRW# 051001

0.059
(1.50)

BSC

0.118
(3.00)

BSC

Advanced Monolithic Systems, Inc.

0.017-0.022
(0.44-0.56)

0.035-0.047
(0.89-1.20)

0.014-0.019
(0.36-0.48)

L (SOT-89 ) AMS DRW# 042392

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AMS5105

3 LEAD SOT-223 PLASTIC PACKAGE

8 LEAD SOIC PLASTIC PACKAGE (S)

0.189-0.197*

(4.801-5.004)

87 65

0.050

(1.270)

TYP

0.150-0.157**

(3.810-3.988)

0.004-0.010

(0.101-0.254)

0.008-0.010

(0.203-0.254)

0.010-0.020
(0.254-0.508)

0.016-0.050

(0.406-1.270)

x 45°

0°-8° TYP

S (SO-8 ) AMS DRW# 042293

0.228-0.244

(5.791-6.197)

12 34

0.053-0.069

(1.346-1.752)

0.014-0.019

(0.355-0.483)

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

Advanced Monolithic Systems, Inc.