Advanced Monolithic Systems AMS2905 Service Manual

http://www.BDTIC.com/AMS

Advanced AMS2905

Monolithic 500mA LOW DROPOUT VOLTAGE REGULATOR

Systems

RoHS compliant

FEATURES APPLICATIONS

• Three Terminal Adjustable or Fixed Voltages* • High Efficiency Linear Regulators

1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V

• Output Current of 500mA • 5V to 3.3V Li

• Operates Down to 1V Dropout • Battery Chargers

• Line Regulation: 0.2% Max. • Sound Cards

• Load Regulation: 0.4% Max. • Power Management for Notebook

• TO-252, SOT-223 and SOT-89 packages • Battery Powered Instrumentation

GENERAL DESCRIPTION

The AMS2905 series of adjustable and fixed voltage regulators are designed to provide 500mA output current and to operate
down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V at maximum output
current, decreasing at lower load currents.
On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the stress under overload
conditions on both the regulator and power source circuitry.
The AMS2905 devices are pin compatible with other three-terminal regulators and are offered in the low profile surface mount
TO-252(DPAK), SOT-223 and SOT-89 packages.

ORDERING INFORMATION:

SOT-89 TO-252 SOT-223

PACKAGE TYPE OPERATING JUNCTION

AMS2905CL AMS2905CD AMS2905
AMS2905CL-1.5 AMS2905CD-1.5 AMS2905-1.5
AMS2905CL-1.8 AMS2905CD-1.8 AMS2905-1.8
AMS2905CL-2.5 AMS2905CD-2.5 AMS2905-2.5
AMS2905CL-2.85 AMS2905CD-2.85 AMS2905-2.85
AMS2905CL-3.3 AMS2905CD-3.3 AMS2905-3.3
AMS2905CL-5.0 AMS2905CD-5.0 AMS2905-5.0
*For additional available fixed voltages contact factory.

PIN CONNECTIONS

FIXED VERSION

1- V

IN

2- Ground

OUT

3- V

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ADJUSTABLE VERSION

1- V

IN

2- Adjust

OUT

3- V

• Post Regulators for Switching Supplies
near Regulator

TEMPERATURE

RANGE

-40 to 125° C

-40 to 125° C

-40 to 125° C

-40 to 125° C

-40 to 125° C

-40 to 125° C

-40 to 125° C

SOT-223 Top View

1

2

3

TO-252 Front View

3
2

1

SOT-89 Top View

321

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ABSOLUTE MAXIMUM RATINGS (Note 1)

Power Dissipation Internally limited Thermal Resistance
Input Voltage 15V SOT-89 package
Operating Junction Temperature TO-252 package
Control Section
Power Transistor
Storage temperature

-40°C to 125°C

-40°C to 150°C

- 65°C to +150°C
Soldering information
Lead Temperature (25 sec)

265°C

SOT-223 package

* With package soldering to copper area over backside
ground plane or internal power plane ϕ
46°C/W to >90°C/W depending on mounting technique and
the size of the copper area.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

= 0 mA, and TJ = +25°C unless otherwise specified.

OUT

AMS2905

= 110°C/W

ϕ

JA

= 80°C/W

ϕ

JA

= 90°C/W*

ϕ

JA

can vary from

JA

Parameter

Device Conditions Min Typ Max Units

Reference Voltage
(Note 2)

Output Voltage
(Note 2)

Line Regulation AMS2905

AMS2905-1.5

AMS2905-1.8

AMS2905-2.5

AMS2905-2.85

AMS2905-3.3

AMS2905-5.0

Load Regulation
(Notes 2, 3)

AMS2905-1.5

AMS2905-1.8

AMS2905-2.5

AMS2905 I

AMS2905-1.5

AMS2905-1.8

AMS2905-2.5

AMS2905-2.85

AMS2905-3.3

AMS2905-5.0

AMS2905

= 10 mA

OUT

10mA ≤ I

≤ 500mA , 4.35V≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 500mA , 4.35V≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 500mA , 4.35V≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 500mA , 4.35V≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 500mA , 4.75V ≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 500mA , 6.5V ≤ VIN ≤ 12V

0 ≤ I

OUT

= 10 mA , 1.5V≤ (VIN - V

I

LOAD

3.0V≤ V

IN

3.0V≤ V

IN

4.0V≤ V

IN

4.35V≤ V

4.75V≤ V

6.5V≤ V

IN

- V

(V

IN

OUT

= 5V, 0 ≤ I

V

IN

= 5V, 0 ≤ I

V

IN

= 5V, 0 ≤ I

V

IN

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≤ 500mA, 1.5V≤ (VIN - V

OUT

≤ 12V

≤ 12V

≤ 12V

≤ 12V

IN

≤ 12V

IN

≤ 12V

) =3V, 10mA ≤ I

≤ 500mA

OUT

≤ 500mA

OUT

≤ 500mA

OUT

OUT

OUT

) ≤ 12V

OUT

≤ 500mA

) ≤ 12V

1.238

1.225

1.485

1.476

1.782

1.772

2.475

2.460

2.82

2.79

3.267

3.235

4.950

4.900

1.250

1.250

1.500

1.500

1.800

1.800

2.500

2.500

2.850

2.850

3.300

3.300

5.000

5.000

0.015

0.035

0.3

0.3

0.3

0.3

0.5

0.5

3 6 10

3 6 10

3 6 12

0.6

0.6

0.6

0.6

1.0

1.0

0.1

0.2

1.262

1.270

1.515

1.524

1.818

1.828

2.525

2.560

2.88

2.91

3.333

3.365

5.050

5.100

0.2

0.2

5
6

5
6

6
6

6
6

10
10

10
10

0.3

0.4

20

20

20

V
V

V
V

V
V

V
V

V
V

V
V

V
V

%
%

mV
mV

mV
mV

mV
mV

mV
mV

mV
mV

mV
mV

%
%

mV
mV

mV
mV

mV
mV

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ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

= 0 mA, and TJ = +25°C unless otherwise specified.

OUT

AMS2905

Parameter

Device Conditions Min Typ Max Units

Load Regulation
(Notes 2, 3)

AMS2905-2.85

AMS2905-3.3

= 5V, 0 ≤ I

V

IN

V

= 5V, 0 ≤ I

IN

≤ 500mA

OUT

≤ 500mA

OUT

3 6 12

20

3 7 15

25

Dropout Voltage
(V

- V

OUT

)

IN

Current Limit

Minimum Load

AMS2905-5.0

AMS2905-1.5/-1.8/-2.5/-

2.85/-3.3/-5.0
AMS2905-1.5/-1.8/-2.5/-

2.85/-3.3/-5.0

V

= 8V, 0 ≤ I

IN

∆V

OUT

(VIN - V

AMS2905 (VIN - V

≤ 500mA

OUT

, ∆V

= 1%, I

REF

) = 5V

OUT

) = 12V (Note 5)

OUT

= 500mA (Note 4)

OUT

5

10

1.1 1.3

20

35

1,000

5 10

Current
Quiescent Current AMS2905-1.5/-1.8/-2.5/-

2.85/-3.3/-5.0

Ripple Rejection AMS2905

AMS2905-1.5/-1.8/-2.5/-

2.85

AMS2905-3.3

AMS2905-5.0

≤ 12V

V

IN

f =120Hz , C
(V

IN-VOUT

f =120Hz , C

= 6V

V

IN

f =120Hz , C

= 6.3V

V

IN

f =120Hz , C

= 8V

V

IN

= 25µF Tantalum, I

OUT

) = 3V, C

ADJ

= 25µF Tantalum, I

OUT

= 25µF Tantalum, I

OUT

= 25µF Tantalum, I

OUT

=25µF

= 500mA,

OUT

= 500mA,

OUT

= 500mA

OUT

= 500mA

OUT

5

60 75

60

72

60 72

60 68

dB

10

Thermal Regulation AMS2905 TA = 25°C, 30ms pulse 0.008 0.04 %W

mV
mV

mV
mV

mV
mV

V

mA

mA

mA

dB

dB

dB

Adjust Pin Current AMS2905

Adjust Pin Current

AMS2905

Change
Temperature Stability

10mA ≤ I

10mA ≤ I

≤ 500mA , 1.5V≤ (VIN - V

OUT

≤ 500mA , 1.5V≤ (VIN - V

OUT

OUT

OUT

) ≤ 12V

) ≤ 12V

55

0.2

0.5

120

5

µA
µA

µA

%
Long Term Stability TA =125°C, 1000Hrs 0.3 1 %
RMS Output Noise

OUT

)

(% of V
Thermal Resistance

= 25°C , 10Hz ≤ f ≤ 10kHz

T

A

0.003 %

15 °C/W

Junction-to-Case

Parameters identified with boldface type apply over the full operating temperature range.

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the

Electrical Characteristics

. The guaranteed specifications apply only for the test conditions listed.

Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2W for SOT-223 package and 0.9W for SOT-89 package. Power

dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full
input/output range.

Note 3: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction

temperature by low duty cycle pulse testing. Load regulation is measured at the output lead ~1/8” from the package.

Note 4: Dropout voltage is specified over the full output current range of the device.
Note 5: Minimum load current is defined as the minimum output current required to maintain regulation. When 1.5V ≤ (V

guaranteed to regulate if the output current is greater than 10mA.

IN

- V

) ≤ 12V the device is

OUT

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