AMS1082 DROPOUT VOLTAGE REGULATORS APPLICATIONS High Ef

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AMS1082 DROPOUT VOLTAGE REGULATORS APPLICATIONS High Ef

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Three Terminal Adjustable Fixed 1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V 5.0V Output Current Operates Down Dropout Line Regulation: 0.015% Load Regulation: 0.1% TO-220 TO-263 packages available
AMS1082
DROPOUT VOLTAGE REGULATORS
APPLICATIONS
High Efficiency Linear Regulators Post Regulators Switching Supplies Microprocessor Supply Battery Chargers Constant Current Regulators Notebook/Personal Computer Supplies Portable Instrumentation
GENERAL DESCRIPTION
AMS1082 series adjustable fixed voltage regulators designed provide output current operate down input-to-output differential. dropout voltage device guaranteed maximum 1.5V maximum output current, decreasing lower load currents. On-chip trimming adjusts reference voltage Current limit also trimmed, minimizing stress under overload conditions both regulator power source circuitry. AMS1082 devices compatible with older three-terminal regulators offered lead TO-220 package lead TO-263 (Plastic DD).
ORDERING INFORMATION:
PACKAGE TYPE LEAD TO-220 AMS1082CT AMS1082CT-1.5 AMS1082CT-2.5 AMS1082CT-2.85 AMS1082CT-3.0 AMS1082CT-3.3 AMS1082CT-3.5 AMS1082CT-5.0 LEAD TO-263 AMS1082CM AMS1082CM-1.5 AMS1082CM-2.5 AMS1082CM-2.85 AMS1082CM-3.0 AMS1082CM-3.3 AMS1082CM-3.5 AMS1082CM-5.0 OPERATING JUNCTION TEMPERATURE RANGE 125° 125° 125° 125° 125° 125° 125° 125°
FRONT VIEW
OUTPUT
CONNECTIONS
FIXED VERSION Ground VOUT ADJUSTABLE VERSION Adjust VOUT
OUTPUT
FRONT VIEW
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS1082
ABSOLUTE MAXIMUM RATINGS (Note
Power Dissipation Internally limited Input Voltage Operating Junction Temperature Range Control Section 125°C Power Transistor 150°C Storage temperature 65°C +150°C Soldering information Lead Temperature sec) Thermal Resistance TO-220 package TO-263 package 300°C 50°C/W 30°C/W
With package soldering 0.5in2 copper area over backside ground plane internal power plane vary from 20°C/W >40°C/W depending mounting technique.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics IOUT +25°C unless otherwise specified. Parameter
Reference Voltage (Note Output Voltage (Note
Device
AMS1082 AMS1082-1.5 AMS1082-2.5 AMS1082-2.85 AMS1082-3.0 AMS1082-3.3 AMS1082-3.5 AMS1082-5.0
Conditions
IOUT 10mA IOUT 10A, 1.5V (VIN VOUT) IOUT IOUT IOUT 4.35V IOUT 4.5V IOUT 4.75V IOUT 10A, IOUT 6.5V ILOAD 1.5V (VIN VOUT) (VIN VOUT) =3V, 10mA IOUT IOUT IOUT IOUT IOUT IOUT 5.25V, IOUT IOUT VOUT VREF IOUT (Note
1.238 1.225 1.485 1.470 2.475 2.450 2.820 2.790 2.970 2.940 3.267 3.235 3.465 3.430 4.950 4.900
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
1.262 1.270 1.515 1.530 2.525 2.550 2.880 2.910 3.030 3.360 3.333 3.365 3.535 3.570 5.050 5.100
Units
Line Regulation Load Regulation (Notes
AMS1082/-1.5/-2.5/-2.85/ -3.0/-3.3/-3.5/-5.0 AMS1082 AMS1082-1.5 AMS1082-2.5 AMS1082-2.85 AMS1082-3.0 AMS1082-3.3 AMS1082-3.5 AMS1082-5.0
Dropout Voltage (VIN VOUT)
AMS1082/-1.5/-2.5/-2.85/ -3.0/-3.3/-3.5/-5.0
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS1082
ELECTRICAL CHARACTERISTICS
Electrical Characteristics IOUT +25°C unless otherwise specified. Parameter
Current Limit Minimum Load Current Quiescent Current Ripple Rejection
Device
AMS1082/-1.5/-2.5/-2.85/ -3.0/-3.3/-3.5/-5.0 AMS1082 AMS1082/-1.5/-2.5/-2.85/ -3.0/-3.3/-3.5/-5.0 AMS1082 AMS1082-1.5 AMS1082-2.5 AMS1082-2.85 AMS1082-3.0 AMS1082-3.3 AMS1082-3.5 AMS1082-5.0
Conditions
(VIN VOUT) (VIN VOUT) (Note =120Hz COUT 25µF Tantalum, IOUT 10A, (VIN-VOUT CADJ =25µF =120Hz COUT 25µF Tantalum, IOUT 10A, 4.5V =120Hz COUT 25µF Tantalum, IOUT 10A, 5.5V =120Hz COUT 25µF Tantalum, IOUT 10A, =120Hz COUT 25µF Tantalum, IOUT =120Hz COUT 25µF Tantalum, IOUT 6.3V =120Hz COUT 25µF Tantalum, IOUT 6.5V =120Hz COUT 25µF Tantalum, IOUT 25°C, 30ms pulse 10mA IOUT 1.5V (VIN VOUT) 10mA IOUT 1.5V (VIN VOUT)
10.1
11.0
12.0
Units
0.008 0.04
Thermal Regulation Adjust Current Adjust Current Change Temperature Stability Long Term Stability Output Noise VOUT Thermal Resistance Junction-to-Case
AMS1082 AMS1082 AMS1082
=125°C, 1000Hrs 25°C 10Hz 10kHz Package: Control Circuitry/ Power Transistor Package: Control Circuitry/ Power Transistor
0.003
1.5/4.0 1.5/4.0
°C/W °C/W
Parameters identified with boldface type apply over full operating temperature range. Note Absolute Maximum Ratings indicate limits beyond which damage device occur. guaranteed specifications test conditions, Electrical Characteristics. guaranteed specifications apply only test conditions listed. Note Line Load regulation guaranteed maximum power dissipation 15W. Power dissipation determined input/output differential output current. Guaranteed maximum power dissipation will available over full input/output range. Note 3:See thermal regulation specifications changes output voltage heating effects. Line load regulation measured constant junction temperature duty cycle pulse testing. Load regulation measured output lead ~1/8" from package. Note Dropout voltage specified over full output current range device. Note Minimum load current defined minimum output current required maintain regulation. When (VIN VOUT) device guaranteed regulate output current greater than 10mA.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS1082
APPLICATION HINTS
AMS1082 series adjustable fixed regulators easy have protection features expected high performance voltage regulators: short circuit protection thermal shut-down. compatible with older three terminal adjustable regulators, these devices offer advantage lower dropout voltage, more precise reference tolerance improved reference stability with temperature. Stability circuit design used AMS1082 series requires output capacitor part device frequency compensation. addition 150µF aluminum electrolytic 22µF solid tantalum output will ensure stability operating conditions. When adjustment terminal bypassed with capacitor improve ripple rejection, requirement output capacitor increases. value 22µF tantalum 150µF aluminum covers cases bypassing adjustment terminal. Without bypassing adjustment terminal smaller capacitors used with equally good results. ensure good transient response with heavy load current changes capacitor values order 100µF used output many regulators. further improve stability transient response these devices larger values output capacitor used. Protection Diodes Unlike older regulators, AMS1082 family does need protection diodes between adjustment output from output input prevent over-stressing die. Internal resistors limiting internal current paths AMS1082 adjustment pin, therefore even with capacitors adjustment protection diode needed ensure device safety under short-circuit conditions. Diodes between input output usually needed. Microsecond surge currents 100A handled internal diode between input output pins device. normal operations difficult those values surge currents even with large output capacitances. high value output capacitors used, such 1000µF 5000µF input instantaneously shorted ground, damage occur. diode from output input recommended, when crowbar circuit input AMS1082 used. Normal power supply cycling even plugging unplugging system will generate current large enough damage. adjustment driven transient basis ±25V, with respect output without device degradation. with regulator, none protection circuitry will functional internal transistors will break down maximum input output voltage differential exceeded.
AMS1082 CADJ
10µF
VOUT
COUT
150µF
Overload Recovery When power first turned input voltage rises, output follows input, permitting regulator start into heavy loads. During start-up, input voltage rising, input-to-output voltage differential remains small, allowing regulator supply large output currents. problem occur with heavy output load when input voltage high output voltage low, when removal output short will permit output voltage recover. load line such load intersect points output current curve. this case, there stable output operating points regulator. With this double intersection, power supply need cycled down zero brought again make output recover. Ripple Rejection ripple rejection values measured with adjustment bypassed. impedance adjust capacitor ripple frequency should less than value (normally to120) proper bypassing ripple rejection approaching values shown. size required adjust capacitor function input ripple frequency. R1=100 120Hz adjust capacitor should 25µF. 10kHz only 0.22µF needed. ripple rejection will function output voltage, circuits without adjust bypass capacitor. output ripple will increase directly ratio output voltage reference voltage (VOUT VREF). Output Voltage AMS1082 series develops 1.25V reference voltage between output adjust terminal. Placing resistor between these terminals causes constant current flow through down through overall output voltage.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS1082
APPLICATION HINTS
This current normally specified minimum load current 10mA. Because IADJ very small constant represents small error usually ignored. Connected shown, multiplied divider ratio. Using 16-gauge wire parasitic line resistance about 0.004 foot, translating 4mV/ft load current. important keep positive lead between regulator load short possible large wire board traces. Thermal Considerations AMS1082 series have internal power thermal limiting circuitry designed protect device under overload conditions. However maximum junction temperature ratings should exceeded under continuous normal load conditions. Careful consideration must given sources thermal resistance from junction ambient, including: junction-to-case, case-to-heat sink interface heat sink resistance itself. ensure safe operating temperatures reflect more accurately device temperature, thermal resistance specifications have been developed. Unlike older regulators with single junction-to-case thermal resistance specification, data section these regulators provides separate thermal resistance maximum junction temperature both Control Section Power Transistor. Calculations both temperatures under certain conditions ambient temperature heat sink resistance ensure that both thermal limits met. Junction-to-case thermal resistance specified from junction bottom case directly below die. This lowest resistance path heat flow. order ensure best possible thermal flow from this area package heat sink proper mounting required. Thermal compound case-to-heat sink interface recommended. thermally conductive spacer used, case device must electrically isolated, added contribution thermal resistance considered.
AMS1082 IADJ
50µA
VOUT VREF
VOUT VREF R2/R1)+IADJR2
Figure Basic Adjustable Regulator Load Regulation True remote load sensing possible provide, because AMS1082 three terminal device. resistance wire connecting regulator load will limit load regulation. data sheet specification load regulation measured bottom package. Negative side sensing true Kelvin connection, with bottom output divider returned negative side load. best load regulation obtained when resistor divider connected directly case load. were connected load, effective resistance between regulator load would R2+R1 Parasitic Line Resistance
PARASITIC LINE RESISTANCE
AMS1082
*CONNECT CASE
CONNECT LOAD Figure Connections Best Load Regulation
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS1082
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage OUTPUT VOLTAGE DEVIATION MINIMUM INPUT/OUTPUT DIFFERENTIAL 0.10 0.05 -0.05 -0.10 -0.15
Load Regulation OUTPUT VOLTAGE CHANGE
Temperature Stability
=25° =150°
-1.0
OUTPUT CURRENT
-0.20
TEMPERATURE
-2.0
TEMPERATURE
Ripple Rejection RIPPLE REJECTION (dB) FREQUENCY (Hz) Load Transient Response LOAD OUTPUT VOLTAGE CURRENT DEVIATION -0.2 -0.4 TIME (µs)
COUT 10µF TANTALUM VOUT PRELOAD 100mA IOUT=IFULL LOAD (VIN-VOUT)VDROPOUT (VIN-VOUT) VRIPPLE 3VP-P VRIPPLE 0.5VP-P
Ripple Rejection Current SHORT-CIRCUIT CURRENT RIPPLE REJECTION (dB) 100k OUTPUT CURRENT IFULL LOAD Line Transient Response INPUT OUTPUT VOLTAGE DEVIATION DEVIATION (mV) -100 -150 TIME (µs)
VOUT 0.2A TANTALUM COUT 10µF TANTALUM CADJ =20kHz VRIPPLE 0.5VP-P 120Hz VRIPPLE 3VP-P
Short-Circuit Current INPUT/OUTPUT DIFFERENTIAL Maximum Power Dissipation* POWER CASE TEMPERATURE
LIMITED MAXIMUM JUNCTION TEMPERATURE
CADJ
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS1082
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Minimum Operating Current (Adjustable only) MINIMUM OPERATING CURRENT (mA) ADJUST CURRENT (µA)
Adjust Current (Adjustable only)
150°
INPUT/OUTPUT DIFFERENTIAL
TEMPERATURE
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
LEAD TO-220 PLASTIC PACKAGE
0.390-0.415 (9.906-10.541)
0.147-0.155 (3.734-3.937) 0.230-0.270 (5.842-6.858) 0.570-0.620 (14.478-15.748)
0.165-0.180 (4.191-4.572) 0.045-0.055 (1.143-1.397)
0.460-0.500 (11.684-12.700)
0.330-0.370 (8.382-9.398)
0.980-1.070 (24.892-27.178) 0.218-0.252 (5.537-6.401) 0.520-0.570 (13.208-14.478)
0.090-0.110 (2.286-2.794) 0.028-0.038 (0.711-0.965)
0.050 (1.270)
0.013-0.023 (0.330-0.584)
0.095-0.115 (2.413-2.921)
(TO-220) DRW# 042193
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS1082
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
LEAD TO-263 PLASTIC
0.390-0.415 (9.906-10.541)
0.060 (1.524)
0.165-0.180 (4.191-4.572)
0.045-0.055 (1.143-1.397)
0.330-0.370 (8.382-9.398)
0.004 +0.008 -0.004 (0.102 +0.203 -0.102 .108 (2.74) 0.095-0.115 (2.413-2.921) 0.90-0.110 (2.29-2.79) 0.013-0.023 (0.330-0.584)
0.199-0.218 (5.05-5.54 0.090-0.110 (2.286-2.794)
0.032 (0.81)
(DD3) DRW# 042191R1
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723

AMS1082 DROPOUT VOLTAGE REGULATORS APPLICATIONS High Ef

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