Advanced Monolithic Systems AMS1501 Service Manual

http://www.BDTIC.com/AMS

Advanced AMS1501

Monolithic 1.5A 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

• Output Current of 1.5A • Adjustable Power Supply

• Low Dropout, 500mV at 1.5A Output Current • Notebook/Personal Computer Supplies

• Fast Transient Response

• Remote Sense

GENERAL DESCRIPTION

The AMS1501 series of adjustable and fixed low dropout voltage regulators are designed to provide 1.5A 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 AMS1501 can also be used as a single supply device.
New features have been added to the AMS1501: 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

1.5A is less than 1mV.
The AMS1501 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 AMS1501 series are ideal for generating power supplies of 2V to 3V where both 5V and 3.3V supplies are available.

The AMS1501 devices are offered in 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

AMS1501CM AMS1501CT AMS1501CD
AMS1501CM-1.5 AMS1501CT-1.5 AMS1501CD-1.5
AMS1501CM-2.5 AMS1501CT-2.5 AMS1501CD-2.5
AMS1501CM-2.85 AMS1501CT-2.85 AMS1501CD-2.85
AMS1501CM-3.0 AMS1501CT-3.0 AMS1501CD-3.0
AMS1501CM-3.3 AMS1501CT-3.3 AMS1501CD-3.3
AMS1501CM-3.5 AMS1501CT-3.5 AMS1501CD-3.5
AMS1501CM-5.0 AMS1501CT-5.0 AMS1501CD-5.0

PACKAGE TYPE OPERATING JUNCTION

• Post Regulators for Switching Supplies

5 LEAD TO-220

TEMPERATURE RANGE

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

FRONT VIEW

5 LEAD TO-252

0 to 125° C
0 to 125° C
0 to 125° C

FRONT VIEW

5 LEAD TO-263

5
4
3
2
1

FRONT VIEW

5
4
3
2
1

5
4
3
2
1

V

POWER

V

CONTROL

OUTPUT

ADJUST/GND

SENSE

Vpower
Vcontrol
OUTPUT
ADJUST/GND
SENSE

Vpower
Vcontrol
OUTPUT
ADJUST/GND
SENSE

Advanced Monolithic Systems, Inc.

http://www.BDTIC.com/AMS

AMS1501

ABSOLUTE MAXIMUM RATINGS (Note 1)

V

Input Voltage 7V Thermal Resistance

POWER

V

CONTROL

Input Voltage 13V TO-220 package

Operating Junction Temperature TO-252 package
Control Section
Power Transistor
Storage temperature

Soldering information
Lead Temperature (25 sec)

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 AMS1501 V

Output Voltage

AMS1501-1.5 V

AMS1501-2.5 V

AMS1501-2.85 V

AMS1501-3.0 V

AMS1501-3.3 V

AMS1501-3.5 V

AMS1501-5.0 V

Line Regulation AMS1501/-1.5/-2.5/

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

Load Regulation

Minimum Load

AMS1501/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0
AMS1501 V

= 2.75V, V

CONTROL

= 2.7V to 12V, V

V

CONTROL

I

= 10mA to 1.5A

LOAD

= 4V, V

CONTROL

= 3V, V

V

CONTROL

= 5V, V

CONTROL

= 4V, V

V

CONTROL

= 5.35V, V

CONTROL

V

= 4.4V, V

CONTROL

= 5.5V, V

CONTROL

= 4.5V, V

V

CONTROL

= 5.8V, V

CONTROL

= 4.8V, V

V

CONTROL

= 6V, V

CONTROL

= 5V, V

V

CONTROL

= 7.5V, V

CONTROL

= 6.5V, V

V

CONTROL

I

= 10 mA , 1.5V≤ (V

LOAD

0.8V≤ (V
V

I

POWER

= V

CONTROL

= 10mA to 1.5A

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 1.5A

LOAD

= 0mA

LOAD

= 0mA to 1.5A

LOAD

= 0mA

LOAD

= 0mA to 1.5A

LOAD

= 0mA

LOAD

= 0mA to 1.5A

LOAD

= 0mA

LOAD

= 0mA to 1.5A

LOAD

= 0mA

= 0mA to 1.5A

LOAD

= 0mA

LOAD

= 0mA to 1.5A

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 AMS1501 V
Current Limit

Ripple Rejection AMS1501/-1.5/-2.5/

AMS1501/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0
AMS1501-1.5/-2.5/

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

AMS1501/-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

= V

CONTROL

I

= 10mA to 1.5A

LOAD

V

= V

CONTROL

I

= 10mA to 1.5A

LOAD

= 2.75V, V

CONTROL

(VIN - V

OUT

V

= V

CONTROL

I

= 1A

LOAD

OUT

OUT

) = 5V

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

P-P

1.5 2.0 2.8

60 80 dB

Thermal Regulation AMS1501 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

10 16

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 0.65/2.70 °C/W

Advanced Monolithic Systems, Inc.

Junction-to-Case M & D Package: Control Circuitry/ Power Transistor 0.65/2.70 °C/W

http://www.BDTIC.com/AMS

AMS1501

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

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

OUT

Parameter

Device Conditions Min Typ Max Units

Dropout Voltage

Control Dropout
(V

Power Dropout
(V

CONTROL

POWER

- V

- V

OUT

OUT

)

AMS1501/-1.5/-2.5/

)

-2.85/-3.0/-3.3/-3.5/-5.0
AMS1501/-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
= 1.5A

= 10mA
= 1.5A

1.00

1.15
.10

.45

1.15

1.30

0.17
.50

V
V

V
V

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

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

= V

OUT

. For the adjustable device V

SENSE

ADJ

= 0V.

Note 3: The dropout voltage for the AMS1501 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 2/5): For fixed voltage devices this is the
bottom of the resistor divider that sets the output voltage.

V

POWER

device of the AMS1501. 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
device.

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

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

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