The AMS1508 series of adjustable and fixed low dropout voltage regulators are designed to provide 8A output current to
The
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 AMS1508 can also be used as a single supply device.
New features have been added to the AMS1508: 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 8A
is less than 1mV.
The AMS1508 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 AMS1508 series are ideal for generating processor supplies of 2V to 3V on motherboards where both 5V and 3.3V
supplies are available.
The AMS1508 devices are offered in 5 lead TO-220 and TO-263 (plastic DD) packages and in the 7 lead TO-220 package.
ORDERING INFORMATION:
OPERATING JUNCTION
5 LEAD TO-263 5 LEAD TO-220 7 LEAD TO-220
TEMPERATURE RANGE
AMS1508CM
AMS1508CT
AMS1508CT-1.5
0 to 125° C
AMS1508CM-1.5 AMS1508CT-1.5 AMS1508CT-2.5
0 to 125° C
AMS1508CM-2.5 AMS1508CT-2.5 AMS1508CT-2.85
0 to 125° C
AMS1508CM-2.85 AMS1508CT-2.85 AMS1508CT-3.0
0 to 125° C
AMS1508CM-3.0 AMS1508CT-3.0 AMS1508CT-3.3
0 to 125° C
AMS1508CM-3.3 AMS1508CT-3.3 AMS1508CT-3.5
0 to 125° C
AMS1508CM-3.5 AMS1508CT-3.5 AMS1508CT-5.0
0 to 125° C
AMS1508CM-5.0 AMS1508CT-5.0
0 to 125° C
PACKAGE TYPE
PIN CONNECTIONS
5 LEAD TO-220
5
4
3
2
1
V
POWER
V
CONTROL
OUTPUT
ADJUST/GND
SENSE
FRONT VIEW
7 LEAD TO-220
7
6
5
4
3
2
1
NC
Vpower
ADJUST
OUTPUT
Vcontrol
GND
SENSE
FRONT VIEW
5 LEAD TO-263
5
4
3
2
1
Vpower
Vcontrol
OUTPUT
ADJUST/GND
SENSE
FRONT VIEW
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1508
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
POWER
Input Voltage
7V
V
CONTROL
Input Voltage
13V
Operating Junction Temperature Range
Control Section
0°C to 125°C
Power Transistor
0°C to 150°C
Storage temperature
- 65°C to +150°C
Soldering information
Lead Temperature (10 sec)
Thermal Resistance
TO-220 package
TO-263 package
300°C
ϕ
JA
= 50°C/W
ϕ
JA
= 30°C/W*
* With package soldering to 0.5in
2
copper area over backside ground
plane or internal power plane
ϕ
JA
can vary from 20°C/W to
>40°C/W
depending on mounting technique.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
LOAD
= 0 mA, and T
J
= +25°C unless otherwise specified.
Parameter
Reference Voltage
Device
AMS1508
Conditions
V
CONTROL
= 2.75V, V
POWER
=2V, I
LOAD
= 10mA
V
CONTROL
= 2.7V to 12V, V
POWER
=3.3V to 5.5V,
I
LOAD
= 10mA to 8A
V
CONTROL
= 4V, V
POWER
=2.V, I
LOAD
= 0mA
V
CONTROL
= 3V, V
POWER
=2.3V, I
LOAD
= 0mA to 8A
V
CONTROL
= 5V, V
POWER
=3.3V, I
LOAD
= 0mA
V
CONTROL
= 4V, V
POWER
=3.3V, I
LOAD
= 0mA to 8A
V
CONTROL
= 5.35V, V
POWER
=3.35V, I
LOAD
= 0mA
V
CONTROL
= 4.4V, V
POWER
=3.7V, I
LOAD
= 0mA to 8A
V
CONTROL
= 5.5V, V
POWER
=3.5V, I
LOAD
= 0mA
V
CONTROL
= 4.5V, V
POWER
=3.8V, I
LOAD
= 0mA to 8A
V
CONTROL
= 5.8V, V
POWER
=3.8V, I
LOAD
= 0mA
V
CONTROL
= 4.8V, V
POWER
=4.1V, I
LOAD
= 0mA to 8A
V
CONTROL
= 6V, V
POWER
=4V, I
LOAD
= 0mA
V
CONTROL
= 5V, V
POWER
=4.3V, I
LOAD
= 0mA to 8A
V
CONTROL
= 7.5V, V
POWER
=5.5V, I
LOAD
= 0mA
V
CONTROL
= 6.5V, V
POWER
=5.8V, I
LOAD
= 0mA to 8A
I
LOAD
= 10 mA , 1.5V≤ (V
CONTROL
- V
OUT
)
≤
12V
0.8V≤ (V
POWER
- V
OUT
)
≤
5.5V
V
CONTROL
= V
OUT
+ 2.5V, V
POWER
=V
OUT
+ 0.8V,
I
LOAD
= 10mA to 8A
V
CONTROL
= 5V, V
POWER
=3.3V, V
ADJ
= 0V (Note 3)
V
CONTROL
= V
OUT
+ 2.5V, V
POWER
=V
OUT
+ 0.8V,
I
LOAD
= 10mA to 8A
V
CONTROL
= V
OUT
+ 2.5V, V
POWER
=V
OUT
+ 0.8V,
I
LOAD
= 10mA to 8A
V
CONTROL
= 2.75V, V
POWER
= 2.05V, I
LOAD
= 10mA
(V
IN
- V
OUT
) = 5V
V
CONTROL
= V
POWER
= V
OUT
+ 2.5V, V
RIPPLE
= 1V
P-P
I
LOAD
= 4A
T
A
= 25°C, 30ms pulse
T Package: Control Circuitry/ Power Transistor
M Package: Control Circuitry/ Power Transistor
Min
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
Typ
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
Max
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
3
Units
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mV
Output Voltage
AMS1508-1.5
AMS1508-2.5
AMS1508-2.85
AMS1508-3.0
AMS1508-3.3
AMS1508-3.5
AMS1508-5.0
Line Regulation
AMS1508/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
Load Regulation
AMS1508/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
Minimum Load
Current
Control Pin Current
(Note 4)
Ground Pin Current
(Note 4)
Adjust Pin Current
Current Limit
AMS1508
AMS1508/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
AMS1508-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
AMS1508
AMS1508/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
Ripple Rejection
AMS1508/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
Thermal Regulation
Thermal Resistance
Junction-to-Case
AMS1508
1
5
mV
5
80
10
135
mA
mA
6
10
mA
50
7.1
60
8.0
80
120
µA
A
dB
0.002
0.020
0.65/2.70
0.65/2.70
%W
°C/W
°C/W
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1508
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
OUT
= 0 mA, and T
J
= +25°C unless otherwise specified.
Parameter
Dropout Voltage
Control Dropout
(V
CONTROL
- V
OUT
)
Power Dropout
(V
POWER
- V
OUT
)
AMS1508/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
AMS1508/-1.5/-2.5/-2.85/
-3.0/-3.3/-3.5/-5.0
Device
Conditions
Note 2
V
POWER
=V
OUT
+ 0.8V, I
LOAD
= 10mA
V
POWER
=V
OUT
+ 0.8V, I
LOAD
= 8A
V
CONTROL
=V
OUT
+ 2.5V, I
LOAD
= 10mA
V
CONTROL
=V
OUT
+ 2.5V, I
LOAD
= 8A
Min
Typ
Max
Units
1.00
1.15
.10
.45
1.15
1.30
0.17
0.50
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
.
The guaranteed specifications apply only for the test conditions listed.
Note 2:
Unless otherwise specified V
OUT
= V
SENSE
. For the adjustable device V
ADJ
= 0V.
Note 3:
The dropout voltage for the AMS1508 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
POWER
(Pin 5/6):
This pin is the collector to the power
device of the AMS1508. 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
(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 (925) 556-9090 Fax (925) 556-9140
AMS1508
APPLICATION HINTS
The AMS1508 series of adjustable and fixed regulators are
designed to power the new generation of microprocessors. The
AMS1508 is designed to make use of multiple power supplies,
existing in most systems, to reduce the dropout voltage. One of
the advantages of the two supply approach is maximizing the
efficiency.
The second supply is at least 1V greater than output voltage and
is providing the power for the control circuitry and supplies the
drive current to the NPN output transistor. This allows the NPN
to be driven into saturation; thereby reducing the dropout voltage
by a VBE compared to conventional designs. For the control
voltage the current requirement is small equal to about 1% of the
output current or approximately 70mA for a8A load. Most of this
current is drive current for the NPN output transistor. This drive
current becomes part of the output current. The maximum voltage
on the Control pin is 13V. The maximum voltage at the Power
pin is 7V. Ground pin current for fixed voltage devices is typical
6mA and is constant as a function of load. Adjust pin current for
adjustable devices is 60µA at 25°C and varies proportional to
absolute temperature.
The improved frequency compensation of AMS1508 permits the
use of capacitors with very low ESR. This is critical in addressing
the needs of modern, low voltage high sped microprocessors. The
new generation of microprocessors cycle load current from several
hundred mA to several A in tens of nanoseconds. Output voltage
tolerances are tighter and include transient response as part of the
specification. Designed to meet the fast current load step
requirements of these microprocessors, the AMS1508 also saves
total cost by needing less output capacitance to maintain
regulation.
Careful design of the AMS1508 has eliminated any supply
sequencing issues associated with a dual supply system. The
output voltage will not turn on until both supplies are operating.
If the control voltage comes up first, the output current will be
limited to a few milliamperes until the power input voltage comes
up. If power input comes up first the output will not turn on at all
until the control voltage comes up. The output can never come up
unregulated. By tying the control and power inputs together the
AMS1508 can also be operated as a single supply device. In
single supply operation the dropout will be determined by the
minimum control voltage.
The new features of the AMS1508 require additional pins over
the traditional 3-terminal regulator. Both the fixed and adjustable
versions have remote sense pins, permitting very accurate
regulation of output voltage at the load, rather than at the
regulator. As a result, over an output current range of 100mA to
8A with a 2.5V output, the typical load regulation is less than
1mV. For the fixed voltages the adjust pin is brought out allowing
the user to improve transient response by bypassing the internal
resistor divider. Optimum transient response is provided using a
capacitor in the range of 0.1µF to 1µF for bypassing the Adjust
pin. The value chosen will depend on the amount of output
capacitance in the system.
In addition to the enhancements mentioned, the reference
accuracy has been improved by a factor of two with a guaranteed
initial tolerance of
±0.6%
at 25°C. This device can hold 1%
accuracy over the full temperature range and load current range,
guaranteed, when combined with ratiometrically accurate internal
divider resistors and operating with an input/output differential of
well under 1V.
Typical applications for the AMS1508 include 3.3V to 2.5V
conversion with a 5V control supply, 5V to 4.2V conversion with
a 12V control supply or 5V to 3.6V conversion with a 12V
control supply. Due to the innovative design of the AMS1508 it is
easy to obtain dropout voltages of less than 0.5V at 4A along with
excellent static and dynamic specifications. Capable of 8A of
output current with a maximum dropout of 0.8V the AMS1508
also has a fast transient response that allows it to handle large
current changes associated with the new generation of
microprocessors. The device is fully protected against overcurrent
and overtemperature conditions.
Grounding and Output Sensing
The AMS1508 allows true Kelvin sensing for both the high and
low side of the load. As a result the voltage regulation at he load
can be easily optimized. Voltage drops due to parasitic
resistances between the regulator and the load can be placed
inside the regulation loop of the AMS1508. The advantages of
remote sensing are illustrated in figures 1 through 3.
Figure 1 shows the device connected as a conventional 3 terminal
regulator with the Sense lead connected directly to the output of
the device. R
P
is the parasitic resistance of the connections
between the device and the load. Typically the load is a
microprocessor and R
P
is made up of the PC traces and /or
connector resistances (in the case of a modular regulator)
between the regulator and the processor. Trace A of figure 3
illustrates the effect of RP. Very small resistances cause
significant load regulation steps.
Figure 2 shows the device connected to take advantage of the
remote sense feature. The Sense pin and the top of the resistor
divider are connected to the top of the load; the bottom of the
resistor divider is connected to the bottom of the load. R
P
is now
connected inside the regulation loop of the AMS1508 and for
reasonable values of R
P
the load regulation at the load will be
negligible. The effect on output regulation can be seen in trace B
of figure 3.
5V
CONTROL
POWER
SENSE
3.3V
AMS1508
OUTPUT
ADJ
R
P
LOAD
R1
R2
R
P
+
V
OUT
-
Figure 1. Conventional Load Sensing
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS1508
APPLICATION HINTS
5V
CONTROL
POWER
SENSE
3.3V
AMS1508
OUTPUT
ADJ
R
P
LOAD
R1
R2
R
P
+
V
OUT
-
Figure 2. Remote Load Sensing
(∆I
OUT
)(R
P
)
V
OUT
FIGURE 1
V
OUT
FIGURE 2
to allow this capability. To ensure good transient response with
heavy load current changes capacitor values on the order of
100µF are used in the output of many regulators. To further
improve stability and transient response of these devices larger
values of output capacitor can be used.
The modern processors generate large high frequency current
transients. The load current step contains higher order frequency
components than the output coupling network must handle until
the regulator throttles to the load current level. Because they
contain parasitic resistance and inductance, capacitors are not
ideal elements. These parasitic elements dominate the change in
output voltage at the beginning of a transient load step change.
The ESR of the output capacitors produces an instantaneous step
in output voltage (∆V=∆I)(ESR). The ESL of the output
capacitors produces a droop proportional to the rate of change of
the output current (V= L)(∆I/∆t). The output capacitance
produces a change in output voltage proportional to the time until
the regulator can respond (∆V=∆t) (∆I/C). Figure 4 illustrates
these transient effects.
ESR
EFFECTS
ESL
EFFECTS
CAPACITANCE
EFFECTS
I
OUT
TIME
SLOPE, V/t =
∆I/C
POINT AT WHICH REGULATOR
TAKES CONTROL
Figure 4.
Figure 3. Remote Sensing Improves Load Regulation
Voltage drops due to R
P
are not eliminated; they will add to the
dropout voltage of the regulator regardless of whether they are
inside or outside the regulation loop. The AMS1508 can control
the voltage at the load as long as the input-output voltage is
greater than the total of the dropout voltage of the device plus the
voltage drop across R
P
.
Stability
The circuit design used in the AMS1508 series requires the use of
an output capacitor as part of the device frequency compensation.
The addition of
150
µF
aluminum electrolytic or a 22µF solid
tantalum on the output will ensure stability for all operating
conditions. For best frequency response use capacitors with an
ESR of less than 1Ω.
In order to meet the transient requirements of the processor larger
value capacitors are needed. Tight voltage tolerances are required
in the power supply. To limit the high frequency noise generated
by the processor high quality bypass capacitors must be used. In
order to limit parasitic inductance (ESL) and resistance (ESR) in
the capacitors to acceptable limits, multiple small ceramic
capacitors in addition to high quality solid tantalum capacitors are
required.
When the adjustment terminal is bypassed to improve the ripple
rejection, the requirement for an output capacitor increases. The
Adjust pin is brought out on the fixed voltage device specifically
Output Voltage
The AMS1508 series develops a 1.25V reference voltage
between the Sense pin and the Adjust pin (Figure5). Placing a
resistor between these two terminals causes a constant current to
flow through R1 and down through R2 to set the overall output
voltage. In general R1 is chosen so that this current is the
specified minimum load current of 10mA.The current out of the
Adjust pin is small, typically 50µA and it adds to the current
from R1. Because I
ADJ
is very small it needs to be considered
only when very precise output voltage setting is required. For
best regulation the top of the resistor divider should be connected
directly to the Sense pin.
V
CONTROL
+
CONTROL
POWER
OUTPUT
V
POWER
+
AMS1508
SENSE
ADJ
+
V
OUT
V
REF
R1
R2
I
ADJ
50µA
V
OUT
= V
REF
(1+
R2/R1)+I
ADJ
R2
Figure 5. Setting Output Voltage
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
How to become an IC design expert? How to improve your design ability? My feeling is that IC design is different from general board- level electronic design. Since the investment in tape-out is larger...
Help: Using modbus card to test UPS communication, the hyperterminal can be established occasionally, but modbusscan32 communication test software cannot be established, and there is no response when ...
Thanks again to Arteli and EEWorld for another opportunity to review the development board. Thank you very much!
This is what the Yatli board looks like after I got it.
Very simple, no USB cable requi...
Chapter 5 JTAG DebuggingThis chapter will introduce how to use TI's official CCS development tools and XDS100V2 emulator to connect to the JTAG interface of the Longquan BB board for software debuggin...
Hey guys, here are the questions:
1 For a file, follow the order of “mount workspace + open and create file + write data to file + close file + close workspace”.
2 During the operation of this file, n...
EDA Technology and Experiments Zhu Min from Harbin Institute of Technology : https://training.eeworld.com.cn/course/5443?EDA technology refers to Electronic Design Automation technology. It is an elec...
The new generation S-Class sedan launched by Mercedes-Benz in 2020, code-named W223, adopts Mercedes-Benz's latest STAR3 architecture in E/E architecture. The new C-Class in 2021, code-named W206, ...[Details]
On August 26, the "2021 Industry's First Intelligent Vehicle Domain Controller Innovation Summit" hosted by Gasgoo was grandly held at the Ruili Hotel in Shanghai Automobile City. The two-day meeting...[Details]
As of the close of April 27, the Shanghai Composite Index was 2815.49 points, up 0.25%, with a turnover of 225.3 billion yuan (the turnover on the previous trading day was 244.1 billion yuan); the Sh...[Details]
In the development of the master control PLC of the workshop automation production line (S7-1500), we often use PLC to drive RFID and barcode readers (cameras) to scan the information on the produc...[Details]
SPI is the abbreviation of "Serial Peripheral Interface" in English, which means serial peripheral interface in Chinese. SPI is a synchronous serial communication method launched by Motorola. It is...[Details]
Antenna arrays and filters are often tuned by varying the voltage on a barium strontium titanate (BST) capacitor. When this ferroelectric material is used as a capacitor, a simple voltage applicati...[Details]
When it comes to virtualized data centers, we cannot do without server virtualization and virtualized SAN storage. Server virtualization and virtualized SAN storage are the only way to virtualized ...[Details]
The program is as follows:
#include reg52.h
unsigned char code table1 ={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40,0x76};//Code table 0-9, the last one is a horizontal line "-"
unsi...[Details]
(Reporter Li Yukun) The reporter learned from the Municipal Development and Reform Commission that there are only three regions in the world where electricity access is completely free, and Beijing...[Details]
The emergence of the new coronavirus has triggered interest in electrochemical biosensors and a subsequent wave of innovation. With better biodetection sensors and readers, healthcare providers will ...[Details]
As the urgent need for improved vehicle performance and efficiency drives innovation and investment in 48V technology
Emerging power standards are expected to drive advances in auto...[Details]
In digital television, digital transmission, and data communications, the signals are digital signals using a variety of modulation methods. At this time, the digital signal level cannot be determine...[Details]
SAA7115 is a 9-bit video decoding chip launched by Philips Semiconductor. It can provide dual 9-bit low noise, 2x oversampling analog to digital conversion, and its signal-to-noise ratio is only 10...[Details]
The biggest difference between LED lighting fixtures and traditional lighting fixtures is that LED lighting fixtures are completely electronic products, while traditional lighting fixtures are ...[Details]
Soft start and star-delta start are two common motor starting methods. They have certain differences in starting current, starting torque, starting time, etc.
Soft Start
Soft st...[Details]
FPGA/CPLD
京公网安备 11010802033920号
EEWORLD
