Advanced Monolithic Systems AMS1505 Service Manual

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http://www.BDTIC.com/AMS

Advanced AMS1505

Monolithic 5A LOW DROPOUT VOLTAGE REGULATORS

Systems

RoHS compliant

FEATURES APPLICATIONS

• Adjustable or Fixed Output • High Current Regulators

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

• Post Re

• 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.

The AMS1505 devices are offered in 5 lead TO-220, 5L TO-263 (plastic DD) and 5L TO-252 (DPAK) packages.

ORDERING INFORMATION: PIN CONNECTIONS

5 LEAD TO-263 5 LEAD TO-220 5 LEAD TO-252

AMS1505CM AMS1505CT AMS1505CD
AMS1505CM-1.5 AMS1505CT-1.5 AMS1505CD-1.5
AMS1505CM-2.5 AMS1505CT-2.5 AMS1505CD-2.5
AMS1505CM-2.85 AMS1505CT-2.85 AMS1505CD-2.85
AMS1505CM-3.0 AMS1505CT-3.0 AMS1505CD-3.0
AMS1505CM-3.3 AMS1505CT-3.3 AMS1505CD-3.3
AMS1505CM-3.5 AMS1505CT-3.5 AMS1505CD-3.5
AMS1505CM-5.0 AMS1505CT-5.0 AMS1505CD-5.0

PACKAGE TYPE OPERATING JUNCTION

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

ulators for Switching Supplies

5 LEAD TO-220

5

V
4
3
2
1

FRONT VIEW

POWER

V

CONTROL

OUTPUT

ADJUST/GND

SENSE

5 LEAD TO-252

5

Vpower

4

Vcontrol

3

OUTPUT
ADJUST/GND

2

SENSE

1

FRONT VIEW

5 LEAD TO-263

5
4
3
2
1

FRONT VIEW

Vpower
Vcontrol
OUTPUT
ADJUST/GND
SENSE

AMS1505

http://www.BDTIC.com/AMS

ABSOLUTE MAXIMUM RATINGS (Note 1)

V

Input Voltage 7V Thermal Resistance

POWER

V

CONTROL

Operating Junction Temp
Control Section
Power Transistor
Storage temperature

Soldering information
Lead Temperature (25 sec)

Input Voltage 13V TO-220 package

erature TO-252 package

0°C to 125°C

0°C to 150°C

- 65°C to +150°C

265°C

TO-263 package

*Minimum pad size is 0.038in
** With package soldering to 0.5in2 copper area over backside

ground plane or internal power plane ϕ
>40°C/W depending on mounting technique.

2

ϕ

can vary from 20°C/W to

JA

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

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

LOAD

= 50°C/W

ϕ

JA

= 92°C/W*

ϕ

JA

= 30°C/W**

JA

Parameter

Device Conditions Min Typ Max Units

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

Minimum Load

AMS1505/-1.5/-2.5/

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

I

POWER

= V

CONTROL

= 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

) ≤ 5.5V

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

LOAD

=4.3V, I

=5.5V, I
=5.8V, I

CONTROL

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

= 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

Current
Control Pin Current

(Note 4)

Ground Pin Current
(Note 4)

Adjust Pin Current AMS1505 V
Current Limit

Ripple Rejection 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

AMS1505/-1.5/-2.5/

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

-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

CONTROL

I

= 2A

LOAD

= V

OUT

= V

OUT

= 2.75V, V

) = 5V

OUT

= V

POWER

+ 2.5V, V

+ 2.5V, V

POWER

= V

OUT

=V

POWER

=V

POWER

= 2.05V, I

+ 2.5V, V

+ 0.8V,

OUT

+ 0.8V,

OUT

= 10mA

LOAD

= 1V

RIPPLE

7.1 8.0

P-P

60 80 dB

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

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

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

5

5 10

50 85

6 10

50 120

V
V

V
V

V
V

V
V

V
V

V
V

V
V

V
V

mV

mV

mA

mA

mA

µA

A

Thermal Resistance

T Package: Control Circuitry/ Power Transistor

Junction-to-Case

M & D Package: Control Circuitry/ Power Transisto

0.65/2.70

r

0.65/2.70

°C/W
°C/W

http://www.BDTIC.com/AMS

AMS1505

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

Parameter

Device Conditions Min Typ Max Units

Dropout Voltage

Control Dropout
(V

Power Dropout
(V

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

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

Note 2: Unless otherwise specified V
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.

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

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

OUT

Note 2

=V

OUT

V

POWER

V

POWER

V

CONTROL

V

CONTROL

= V

. For the adjustable device V

SENSE

=V

=V
=V

OUT

OUT

OUT

OUT

+ 0.8V, I
+ 0.8V, I

+ 2.5V, I
+ 2.5V, I

LOAD

LOAD

LOAD

LOAD

ADJ

= 10mA
= 5A

= 10mA
= 5A

= 0V.

1.00

1.15
.10

.45

1.15

1.30

0.17

0.50

V
V

V
V

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

ge for the device. Adding a small bypass

reference

volta
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 2/5): For fi

xed volta

ge devices this is the

bottom of the resistor divider that sets the output voltage.

V

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

CONTROL

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

ce.

devi

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

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