ADMOS AMS1505CT-5.0, AMS1505CT-3.5, AMS1505CT-3.3, AMS1505CT-3.0, AMS1505CT-2.85 Datasheet

Advanced AMS1505
Monolithic 5A LOW DROPOUT VOLTAGE REGULATORS

Systems

FEATURES APPLICATIONS

•• Adjustable or Fixed Output •• High Current Regulators

1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V

•• Output Current of 5A •• Microprocessor Supply

•• Low Dropout, 500mV at 5A Output Current •• Adjustable Power Supply

•• Fast Transient Response •• Notebook/Personal Computer Supplies

•• Remote Sense

GENERAL DESCRIPTION

The AMS1505 series of adjustable and fixed low dropout voltage regulators are designed to provide 5A output current to
power the new generation of microprocessors. The dropout voltage of the device is 100mV at light loads and rising to 500mV
at maximum output current. A second low current input voltage 1V or greater then the output voltage is required to achieve
this dropout. The AMS1505 can also be used as a single supply device.
New features have been added to the AMS1505: a remote Sense pin is brought out virtually eliminating output voltage
variations due to load changes. The typical load regulation, measured at the Sense pin, for a load current step of 100mA to 5A
is less than 1mV.
The AMS1505 series has fast transient response. The Adjust pin is brought out on fixed devices. To further improve the
transient response the addition of a small capacitor on the Adjust pin is recommended.
The AMS1505 series are ideal for generating processor supplies of 2V to 3V on motherboards where both 5V and 3.3V
supplies are available.

•• Post Regulators for Switching Supplies

The AMS1505 devices are offered in 5 lead TO-220 and TO-263 (plastic DD) packages and in the 7 lead TO-220 package.

ORDERING INFORMATION: PIN CONNECTIONS

PACKAGE TYPE OPERATING JUNCTION

5 LEAD TO-263 5 LEAD TO-220 7 LEAD TO-220

AMS1505CM AMS1505CT AMS1505CT-1.5
AMS1505CM-1.5 AMS1505CT-1.5 AMS1505CT-2.5
AMS1505CM-2.5 AMS1505CT-2.5 AMS1505CT-2.85
AMS1505CM-2.85 AMS1505CT-2.85 AMS1505CT-3.0
AMS1505CM-3.0 AMS1505CT-3.0 AMS1505CT-3.3
AMS1505CM-3.3 AMS1505CT-3.3 AMS1505CT-3.5
AMS1505CM-3.5 AMS1505CT-3.5 AMS1505CT-5.0
AMS1505CM-5.0 AMS1505CT-5.0

TEMPERATURE RANGE

0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C

5 LEAD TO-220

5
4
3
2
1

FRONT VIEW

7 LEAD TO-220

7
6
5
4
3
2
1

FRONT VIEW

5 LEAD TO-263

5
4
3
2
1

FRONT VIEW

V

POWER

V

CONTROL

OUTPUT

ADJUST/GND

SENSE

NC
ADJUST

Vcontrol
SENSE

Vpower
Vcontrol
OUTPUT
ADJUST/GND
SENSE

Vpower

OUTPUT
GND

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

AMS1505

Junction Temperature Range

ABSOLUTE MAXIMUM RATINGS (Note 1)

V

Input Voltage 7V Soldering information

POWER

V
Operating
Control Section
Power Transistor
Storage temperature

CONTROL

Input Voltage 13V Lead Temperature (10 sec)

Thermal Resistance

0°C to 125°C

0°C to 150°C

- 65°C to +150°C

TO-220 package
TO-263 package

* With package soldering to 0.5in2 copper area over backside ground
plane or internal power plane ϕ

can vary from 20°C/W to >40°C/W

JA

300°C

ϕ JA= 50°C/W

ϕ JA= 30°C/W*

depending on mounting technique.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

Parameter Device Conditions Min Typ Max Units

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

LOAD

Reference Voltage AMS1505 V

Output Voltage AMS1505-1.5 V

AMS1505-2.5 V

AMS1505-2.85 V

AMS1505-3.0 V

AMS1505-3.3 V

AMS1505-3.5 V

AMS1505-5.0 V

Line Regulation AMS1505/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0

Load Regulation AMS1505/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0

Minimum Load

AMS1505 V

= 2.75V, V

CONTROL

V

= 2.7V to 12V, V

CONTROL

I

= 10mA to 5A

LOAD

= 4V, V

CONTROL

V

= 3V, V

CONTROL

= 5V, V

CONTROL

V

= 4V, V

CONTROL

= 5.35V, V

CONTROL

V

= 4.4V, V

CONTROL

= 5.5V, V

CONTROL

V

= 4.5V, V

CONTROL

= 5.8V, V

CONTROL

V

= 4.8V, V

CONTROL

= 6V, V

CONTROL

V

= 5V, V

CONTROL

= 7.5V, V

CONTROL

V

= 6.5V, V

CONTROL

I

= 10 mA , 1.5V≤ (V

LOAD

0.8V≤ (V

POWER

V

= V

CONTROL

I

= 10mA to 5A

LOAD

= 5V, V

CONTROL

POWER
POWER

POWER
POWER

POWER
POWER

- V
+ 2.5V, V

OUT

POWER

POWER

POWER

POWER

POWER
POWER

POWER
POWER

POWER
POWER

OUT

=2V, I

POWER

=2.V, I
=2.3V, I

=3.3V, I
=3.3V, I

=3.35V, I

=3.7V, I
=3.5V, I

=3.8V, I
=3.8V, I

=4.1V, I

=4V, I
=4.3V, I

=5.5V, I
=5.8V, I

CONTROL

) ≤ 5.5V

POWER

=3.3V, V

= 10mA

LOAD

=3.3V to 5.5V,

= 0mA

LOAD

= 0mA to 5A

LOAD

= 0mA

LOAD

= 0mA to 5A

LOAD

= 0mA

LOAD

= 0mA to 5A

LOAD

= 0mA

LOAD

= 0mA to 5A

LOAD

= 0mA

LOAD

= 0mA to 5A

LOAD

= 0mA

LOAD

= 0mA to 5A

LOAD

= 0mA

LOAD

= 0mA to 5A

LOAD

- V

) ≤ 12V

OUT

=V

+ 0.8V,

OUT

= 0V (Note 3)

ADJ

1.243

1.237

1.491

1.485

2.485

2.475

2.821

2.833

2.982

2.970

3.280

3.235

3.479

3.430

4.930

4.950

1.250

1.250

1.500

1.500

2.500

2.500

2.850

2.850

3.000

3.000

3.300

3.300

3.500

3.500

5.000

5.000
1 3

1 5

5 10

1.258

1.263

1.509

1.515

2.515

2.525

2.879

2.867

3.018

3.030

3.320

3.333

3.521

3.535

5.030

5.050

V
V

V
V

V
V

V
V

V
V

V
V

V
V

V
V

mV

mV

mA

Current
Control Pin Current

(Note 4)

Ground Pin Current
(Note 4)

Adjust Pin Current AMS1505 V
Current Limit AMS1505/-1.5/-2.5/

AMS1505/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0
AMS1505/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0

V

CONTROL

I

= 10mA to 5A

LOAD

V

CONTROL

I

= 10mA to 5A

LOAD

CONTROL

(VIN - V

= V

OUT

= V

OUT

= 2.75V, V

) = 5V

OUT

+ 2.5V, V

+ 2.5V, V

POWER

=V

POWER

=V

POWER

= 2.05V, I

OUT

OUT

LOAD

+ 0.8V,

+ 0.8V,

= 10mA

50 85

50 120

7.1 8.0

6 10

mA

mA

µA

A

-2.85/-3.0/-3.3/-3.5/-5.0

Ripple Rejection AMS1505/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0

V

CONTROL

I

LOAD

= 2A

= V

POWER

= V

+ 2.5V, V

OUT

RIPPLE

= 1V

P-P

60 80 dB

Thermal Regulation AMS1505 TA = 25°C, 30ms pulse 0.002 0.020 %W
Thermal Resistance

Junction-to-Case

T Package: Control Circuitry/ Power Transistor
M Package: Control Circuitry/ Power Transistor

0.65/2.70

0.65/2.70

°C/W
°C/W

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

AMS1505

CONTROL

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

Parameter Device Conditions Min Typ Max Units

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

OUT

Dropout Voltage

Control Dropout
(V

Power Dropout
(V

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

CONTROL

POWER

- V

- V

OUT

OUT

)

AMS1505/-1.5/-2.5/

)

-2.85/-3.0/-3.3/-3.5/-5.0
AMS1505/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0

Note 2

V

POWER

V

POWER

V

CONTROL

V

CONTROL

=V
=V

=V
=V

OUT

OUT

OUT

OUT

+ 0.8V, I
+ 0.8V, I

+ 2.5V, I
+ 2.5V, I

LOAD

LOAD

LOAD

LOAD

= 10mA
= 5A

= 10mA
= 5A

1.00

1.15
.10

.45

1.15

1.30

0.17

0.50

V
V

V
V

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: Unless otherwise specified V

OUT

= V

. For the adjustable device V

SENSE

ADJ

= 0V.

Note 3: The dropout voltage for the AMS1505 is caused by either minimum control voltage or minimum power voltage. The specifications represent the minimum

input/output voltage required to maintain 1% regulation.

Note 4: For the adjustable device the minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider

used to set the output voltage is selected to meet the minimum load current requirement.

Note 5: The control pin current is the drive current required for the output transistor. This current will track output current with a ratio of about 1:100. The

minimum value is equal to the quiescent current of the device.

PIN FUNCTIONS

Sense (Pin 1): This pin is the positive side of the

reference voltage for the device. With this pin it is
possible to Kelvin sense the output voltage at the load.

Adjust (Pin 2/5): This pin is the negative side of the
reference voltage for the device. Adding a small bypass
capacitor from the Adjust pin to ground improves the
transient response. For fixed voltage devices the Adjust
pin is also brought out to allow the user to add a bypass
capacitor.

GND (Pin 2, 7-Lead only): For fixed voltage devices this
is the bottom of the resistor divider that sets the output
voltage.

V

(Pin 5/6): This pin is the collector to the power

POWER

device of the AMS1505. The output load current is
supplied through this pin. The voltage at this pin must
be between 0.1V and 0.8V greater than the output
voltage for the device to regulate.

V

(Pin 4/3): This pin is the supply pin for the

control circuitry of the device. The current flow into
this pin will be about 1% of the output current. The
voltage at this pin must be 1.3V or greater than the
output voltage for the device to regulate.

Output (Pin 3/4): This is the power output of the
device.

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]