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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
PIN CONNECTIONS
TO-92 SOT-89 RANGE AMS116N-X AMS116L-X IND X =5V *For additional available fixed voltages contact factory
TO-92 Plastic Package (N)
OUTPUT INPUT
SOT-89 Package (L)
GND
1 INPUT
2 GND
3 OUTPUT
Bottom View
Top View
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS116
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage Operating Voltage Range Load Current Internal Power Dissipation 18V 2.5V to 16V 150mA Internally Limited Maximum Junction Temperature +125C Storage Temperature -65C to +150C Lead Temperature (Soldering 25 sec) 265C ESD 2000V
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at TJ=25C, C2 = 100F unless otherwise specified. PARAMETER
Output Voltage Line Regulation Load Regulation Dropout Voltage
IN
CONDITIONS
(Note 2) V = VOUT+3V V = VOUT+3V to 14V
IN
Min.
-3
AMS116-X Typ.
2 15 80 170 400 80 .35
Units Max.
+3 30 60 150 330 1000 % mV mV mV mV A dB mV/C
5mA I 100 mA
O
IO 30 mA IO = 100 mA IO 10 mA, V = VOUT+3V to 14V IN fO = 120Hz IO 10 mA, V = VOUT+3V to 14V IN
Quiescent Current Ripple Rejection Temperature Coefficient
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: See Circuit in Typical Applications. To ensure constant junction temperature, low duty cycle pulse testing is used. Note 3: Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25C.
+
+
VIN
VOUT
Figure 1. SOT-89 Board Layout
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS116
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 150C. 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 25C 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/ (150C - 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 = JA x PD + TA The internal limit for junction temperature is 150C. If the ambient temperature is 25C, then:
150C = JA x PD + 25C
Take a vertical line from the maximum operating temperature (75C) 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 100F aluminum electrolytic or a 47F tantalum electrolytic can be used. A critical characteristic of the electrolytic capacitors is their performance over temperature. The AMS116 is designed to operate to -40C, but some electrolytics will freeze around -30C 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 25C the output capacitor value can be reduced by a factor of two over the value required for the entire temperature range (47F for a high quality aluminum or 22F 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.
5.
JA = 125C/ 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)
150
Figure 2 Procedure: 1. Find PD. 2. PD1 is calculated as PD x (0.8 - 0.9). 3. Plot PD1 against 25C. 4. Connect PD1 to the point corresponding to the 150C.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS116
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage INPUT OUTPUT DIFFERENTIAL (V) INPUT OUTPUT DIFFERENTIAL (V) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 80 40 120 JUNCTION TEMPERATURE ( C)
IO = 50mA IO = 10mA IO = 100mA
Dropout Voltage 1.2 1.0 0.8 0.6 0.4 0.2 0 0 50 OUTPUT CURRENT (mA) 100 INPUT VOLTAGE OUTPUT VOLTAGE CHANGE (V) DEVIATION (mV) 3 2 1 0 -1 -2 ~ -3 ~
Line Transient Response
VIN = VOUT = 9V C2= 100 F
~ ~
3 0 0 15 30 TIME (s) 45
OUTPUT VOLTAGE DEVIATION (mV)
Load Transient Response 300 40 0 -40
C2= 100F
Peak Output Current 30 QUIESCENT CURRENT (mA) 25 20 15 10 5 0 0 20 10 INPUT VOLTAGE (V) 30 0
Quiescent Current
VIN = 14V
OUTPUT CURRENT ( mA)
250
TJ= 25C
200 150 100 50 0
TJ = 85C
LOAD CURRENT(mA)
TJ = -40C
~ ~
150
~ ~
0 0 15 30 TIME (s) 45
60 30 90 OUTPUT CURRENT (mA)
Quiescent Current 25 20 15 10 3 2 1 0 -40
IO = 0mA
Quiescent Current 35 QUIESCENT CURRENT ( mA) 30 25 20 15 10 5 0
IO= 10mA IO= 50mA IO= 100mA
Ripple Rejection 85 80 RIPPLE REJECTION (dB) 75 70 65 60 55 50 45 1
IO= 10mA C2 = 100F ALUM C2 = 100F TANTALUM
QUIESCENT CURRENT (mA)
~ ~
IO = 50mA
~ ~
0 40 80 120 TEMPERATURE ( C)
-5 -20 -10
0 10 20 30 40 50 60 INPUT VOLTAGE (V)
10
100 1k 10k 100k FREQUENCY (Hz)
1M
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS116
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Ripple Rejection 85 80 RIPPLE REJECTION (dB) RIPPLE REJECTION (dB) 75 70 65 60 55 50 45 0
FQ= 120Hz
Ripple Rejection 85 80 75 70 65 60 55 50 45 0
FQ= 120Hz
Output Capacitor ESR EQUIVALENT SERIES RESISTANCE ( ) 100
COUT= 100F VO = 5V
10
1
STABLE REGION
0.1
25 50 75 OUTPUT CURRENT (mA)
100
25 50 75 OUTPUT CURRENT (mA)
100
0.01
0
80 20 40 60 OUTPUT CURRENT (mA)
100
Maximum Power Dissipation (TO-92) 1.0 0.9 POWER DISSIPATION (W) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 10 20 30 40 50 60 70 80 AMBIENT TEMPERATURE ( C)
0.4" Lead Lenght from PC Board 0.125" Lead Lenght from PC Board
Maximum Power Dissipation (SOT-89) 1.0 0.9 POWER DISSIPATION (W) 0.8 0.7 0.6 0.5 0.4 0.3
UNMOUNTED MOUNTED ON PCB
0.2 0.1 0 0 10 20 30 40 50 60 70 80 90 AMBIENT TEMPERATURE ( C)
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS116
TYPICAL APPLICATIONS
Voltage Regulator Circuit
Voltage Boost Circuit
VIN UNREGULATED INPUT C1* 0.1F
AMS116
VOUT REGULATED OUTPUT C2** 100F
AMS116 + 1F +
VO
47F VOUT
GND
IQ
IQ
R
*Required if regulator is located far from power supply filter. **C2 must be at least 100F 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).
VOUT = VO+IQR
Current Boost Circuit
Current Regulator Circuit
100
IO AMS116 R
AMS116
+
10F
+
+ VO 47F IQ
GND
+
VIN
47F
1F
IO = (VO/R )+ IQ
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS116
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD TO-92 PLASTIC PACKAGE (N)
0.0600.005 (1.5240.127) DIA
0.1800.005 (4.5720.127) 0.0600.010 (1.5240.254) 0.1400.010 (3.5560.127)
0.1800.005 (4.5720.127)
0.90 (2.286) NOM
5 NOM 0.500 (12.70) MIN
10 NOM
0.050 (1.270) MAX
UNCONTROLLED LEAD DIMENSIONS
0.0500.005 (1.2700.127)
0.0160.003 (0.4060.076)
0.0150.002 (0.3810.051)
N (TO-92 ) AMS DRW# 042391
SOT-89 PLASTIC PACKAGE (L)
0.173-0.181 (4.40-4.60) 0.064-0.072 (1.62-1.83)
0.055-0.063 (1.40-1.60) 0.014-0.017 (0.35-0.44)
0.155-0.167 (3.94-4.25) 0.090-0.102 (2.29-2.60) 0.084-0.090 (2.13-2.29)
0.035-0.047 (0.89-1.20) 0.059 (1.50) BSC 0.118 (3.00) BSC 0.014-0.019 (0.36-0.48) 0.017-0.022 (0.44-0.56)
L (SOT-89 ) AMS DRW# 042392
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723

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