DataSheet.fr

PDF AMS116 Fiche technique - Advanced Monolithic Systems

Numéro de référence AMS116
Description 100mA LOW DROPOUT VOLTAGE REGULATOR
Fabricant Advanced Monolithic Systems 
Logo Advanced Monolithic Systems Logo 

7 Pages
		

No Preview Available !

AMS116 Datasheet, Description
Advanced
Monolithic
Systems
FEATURES
5V Version Available*
Output Current of 100mA
Very Low Quiescent Current
Reverse Battery Protection
Input-output Differential less than 0.6V
Short Circuit protection
Internal Thermal Overload Protection
AMS116
100mA LOW DROPOUT VOLTAGE REGULATOR
RoHS compliant
APPLICATIONS
Battery Powered Systems
Portable Consumer Equipment
Cordless Telephones
Portable (Notebook) Computers
Portable Instrumentation
Radio Control Systems
Personal Communication Equipment
Toys
Low Voltage Systems
GENERAL DESCRIPTION
The AMS116 series consists of positive fixed voltage regulators ideally suited for use in battery-powered systems. These
devices feature very low quiescent current of 1mA or less when supplying 10mA loads. This unique characteristic and the
extremely low input -output differential required for proper regulation (0.2V for output currents of 10mA) make the AMS116
ideal to use for standby power systems.
Like other regulators the AMS116 series also includes internal current limiting, thermal shutdown, and is able to withstand
temporary power-up with mirror-image insertion.
The AMS116 is offered in the 3-pin TO-92 package and SOT-89 package.
ORDERING INFORMATION
PACKAGE TYPE
OPER. TEMP
TO-92
SOT-89
RANGE
AMS116N-X
AMS116L-X
IND
X =5V
*For additional available fixed voltages contact factory
PIN CONNECTIONS
TO-92
Plastic Package (N)
OUTPUT
INPUT
GND
Bottom View
SOT-89 Package
(L)
123
INPUT GND OUTPUT
Top View
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723
AMS116 Fiche technique
APPLICATION HINTS
Package Power Dissipation
The package power dissipation is the level at which the thermal
sensor monitoring the junction temperature is activated. The
AMS116 shuts down when the junction temperature exceeds the
limit of 150°C. The junction temperature rises as the difference
between the input power and output power increases. The
mounting pad configuration on the PCB, the board material, as
well as the ambient temperature affect the rate of temperature rise.
The junction temperature will be low, even if the power
dissipation is high, when the mounting of the device has good
thermal conductivity. When mounted on the recommended
mounting pad (figure1) the power dissipation for the SOT-89
package is 600mW. For operation above 25°C derate the power
dissipation at 4.8mW/°C. To determine the power dissipation for
shutdown when mounted, attach the device on the PCB and
increase the input-to-output voltage until the thermal protection
circuit is activated. Calculate the power dissipation of the device
by subtracting the output voltage from the input voltage and
multiply by the output current. The measurements should allow
for the ambient temperature of the PCB. The value obtained from
PD/ (150°C - TA) is the derating factor. The PCB mounting pad
should provide maximum thermal conductivity in order to
maintain low device temperatures. As a general rule, the lower the
temperature, the better the reliability of the device.
The thermal resistance when the device is mounted is equal to:
TJ = θJA x PD + TA
The internal limit for junction temperature is 150°C. If the ambient
temperature is 25°C, then:
150°C = θJA x PD + 25°C
θJA = 125°C/ PD
A simple way to determine PD is to calculate VIN x IIN when the
output is shorted. As the temperature rises, the input gradually will
decrease. The PD value obtained when the thermal equilibrium is
reached, is the value that should be used.
The range of usable currents can be found from the graph in figure
2.
(mW)
PD 3
DPD 6
4
5
25 50 75
T (°C)
Figure 2
150
Procedure:
1. Find PD.
2. PD1 is calculated as PD x (0.8 - 0.9).
3. Plot PD1 against 25°C.
4. Connect PD1 to the point corresponding to the 150°C.
AMS116
5. Take a vertical line from the maximum operating temperature
(75°C) to the derating curve.
6. Read the value of PD at the point where the vertical line
intersects the derating curve. This is the maximum power
dissipation, DPD.
The maximum operating current is:
IOUT = (DPD/ (VIN(MAX) - VO)
External Capacitors
The AMS116 series require an output capacitor for device
stability. The value required depends on the application circuit
and other factors.
Because high frequency characteristics of electrolytic capacitors
depend greatly on the type and even the manufacturer, the value
of capacitance that works well with AMS116 for one brand or
type may not necessary be sufficient with an electrolytic of
different origin. Sometimes actual bench testing will be the only
means to determine the proper capacitor type and value. To obtain
stability in all general applications a high quality 100µF
aluminum electrolytic or a 47µF tantalum electrolytic can be used.
A critical characteristic of the electrolytic capacitors is their
performance over temperature. The AMS116 is designed to
operate to -40°C, but some electrolytics will freeze around -30°C
therefore becoming ineffective. In such case the result is
oscillation at the regulator output. For all application circuits
where cold operation is necessary, the output capacitor must be
rated to operate at the minimum temperature. In applications
where the regulator junction temperature will never be lower than
25°C the output capacitor value can be reduced by a factor of two
over the value required for the entire temperature range (47µF for
a high quality aluminum or 22µF for a tantalum electrolytic
capacitor).
With higher output currents, the stability of AMS116 decreases.
Considering the fact that in many applications the AMS116 is
operated at only a few milliamps (or less) of output current, the
output capacitor value can be reduced even further. For example,
a circuit that is required to deliver a maximum of 10mA of output
current from the regulator output will need an output capacitor of
only half the value compared to the same regulator required to
deliver the full output current of 100mA.
As a general rule, with higher output voltages the value of the
output capacitance decreases, since the internal loop gain is
reduced.
In order to determine the minimum value of the output capacitor,
for an application circuit, the entire circuit including the capacitor
should be bench tested at minimum operating temperatures and
maximum operating currents. To maintain internal power
dissipation and die heating to a minimum, the input voltage should
be maintain at 0.6V above the output. Worst-case occurs just after
input power is applied and before the die had the chance to heat
up. After the minimum capacitance value has been found for the
specific brand and type of electrolytic capacitor, the value should
be doubled for actual use to cover for production variations both
in the regulator and the capacitor.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

3 Page

AMS116 pdf
TYPICAL APPLICATIONS
Voltage Regulator Circuit
VIN
UNREGULATED
INPUT
C1*
0.1µF
AMS116
GND
IQ
VOUT
REGULATED
OUTPUT
C2**
100µF
*Required if regulator is located far from power supply filter.
**C2 must be at least 100µF to maintain stability; it can be increased
without bound to maintain regulation during transients and it should be
located as close as possible to the regulator. This capacitor must be rated
over the same operating temperature range like the regulator. The ESR
of this capacitor is critical (see curve).
AMS116
Voltage Boost Circuit
+
1µF
AMS116
VO
IQ R
+ 47µF
VOUT
VOUT = VO+IQR
Current Boost Circuit
100
10µF +
AMS116
GND
+ 47µF
Current Regulator Circuit
AMS116
+
VIN 1µF VO
R
+
47µF
IQ
IO
IO = (VO/R )+ IQ
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

6페이지



Constitution7 Pages
Télécharger[ AMS116.PDF ]

Liens de partage


Fiche technique recommandé

RéférenceDescriptionFabricant
AMS11171A Adjustable/Fixed Low Dropout Linear RegulatorAdvanced Monolithic Systems
Advanced Monolithic Systems
AMS1117LOW DROPOUT VOLTAGE REGULATORESTEK
ESTEK
AMS11171A Low Dropout Positive AdjustableKexin
Kexin
AMS11171A Low Dropout Linear RegulatorTuofeng Semiconductor
Tuofeng Semiconductor
AMS1117-1.2Low Dropout Linear RegulatorKexin
Kexin
AMS1117-1.5Low Dropout Linear RegulatorKexin
Kexin
AMS1117-1.8Low Dropout Linear RegulatorKexin
Kexin
AMS1117-1.9Low Dropout Linear RegulatorKexin
Kexin
AMS1117-2.5Low Dropout Linear RegulatorKexin
Kexin

RéférenceDescriptionFabricant
H6060The H6060 is a monolithic low-power CMOS device combining a programmable timer and a series of voltage comparators on the same chip.EM Microelectronic - MARIN SA
EM Microelectronic - MARIN SA
IT8772EThe IT8772E is a highly integrated Super I/O using the Low Pin Count Interface. It provides the most commonly used legacy Super I/O functionality plus the latest Environment Control initiatives, including H/W Monitor and Fan Speed Controller.ITE
ITE

Un datasheet est un document fourni par le constructeur du composant, où figurent toutes les données techniques sur le produit: puissance dissipée, courant maximal, tension de seuil, tension de claquage, température de stockage, etc. Ils sont en général fournis gratuitement, et se présentent très régulièrement sous la forme d'un document pdf.


www.DataSheet.fr    |   2018   |  Contactez-nous    |   Recherche