LM317MX Fast Delivery |IC PHOENIX CO.,LIMITED

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LM317MX
MEDIUM CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR
LM217M
LM317M
MEDIUM CURRENT
1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR
September 1997 OUTPUT VOLTAGERANGE: 1.2 TO 37V OUTPUT CURRENTIN EXCESS OF 500 mA LINE REGULATION TYP. 0.01% LOAD REGULATION TYP. 0.1% THERMAL OVERLOAD PROTECTION SHORT CIRCUIT PROTECTION OUTPUT TRANSISTOR SAFE AREA
COMPENSATION FLOATING OPERATION FOR HIGH
VOLTAGEAPPLICATIONS
DESCRIPTION
The LM217M/LM317M are monolithic integrated
circuitsin TO-220, DPAK, SOT-82 and SOT-194
packages intendedfor useas positive adjustable
voltage regulators.
They are designedto supply until 500 mAof load
current with an output voltage adjustable overa
1.2to 37V range.
The nominal output voltageis selectedby means onlya resistive divider, making the device
exceptionally easyto use and eliminating the
stockingof many fixed regulators.
SCHEMATIC DIAGRAM
SOT-82 SOT-194
DPAK
TO-252
TO-220
1/11
TEST CIRCUIT
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit -Vo Input-Output Differential Voltage 40 V Power Dissipation Internally Limited
Topr Operating Junction Temperature Range (*) forLM217M
forLM317M
-40to 125
0to 125CC
Tstg Storage Temperature Range -55to 150 oC
(*) Re-Bootisnot guaranteedforTj≥85oC
PIN CONNECTION AND ORDERING NUMBERS
TO-220 SOT-82
Type TO-220 DPAK SOT-82 SOT-194
LM217M LM217MT LM217MDT LM217MX LM217MS
LM317M LM317MT LM317MDT LM317MX LM317MS
DPAK SOT-194
THERMAL DATA
Symbol Parameter SOT-82
SOT-194
DPAK
TO-220 Unit
Rthj-case
Rthj-amb
Thermal Resistance Junction-case Max
Thermal Resistance Junction-ambient Max
100 C/W C/W
LM217M/LM317M
2/11
(*) CADJis connected between Adjust pinand Ground.
ELECTRICAL CHARACTERISTICS FOR LM317M (Referto the test circuits,0≤Tj≤ 125oC -Vo=5V,Io= 100 mA,Pd≤ 7.5W, unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
ΔVo Line Regulation Vi -Vo=3to40V Tj =25oC 0.01 0.04 %/V
0.02 0.07 %/V
ΔVo LoadRegulation Vo≤5V=10 mAto 500mA =25o C5 25 mV 70 mV≥5V=10 mAto 500mA =25oC 0.1 0.5 %/Vo
0.3 1.5 %/Vo
IADJ Adjustment Pin Current 50 100 μA
ΔIADJ Adjustment Pin Current Vi -Vo=3to40V=10 mAto 500mA
0.2 5 μA
VREF Reference Voltage Vi -Vo=3to40V=10 mAto 500mA
1.2 1.25 1.3 V
ΔVo
Output Voltage Temperature
Stability
0.7 %
Io(min) Minimum Load Current Vi -Vo =40V 3.5 10 mA
Io(max) Maximum OutputCurrent Vi -Vo ≤15V -Vo =40V,Pd 500 1000
200 Output Noise Voltage
(percentanceof VO)= 10Hzto 10KHz =25oC
0.003 %
SVR Supply Voltage Rejection(*) Tj =25oC= 120Hz
CADJ=0 65 dB
CADJ=10μF66 80 dB
(*) CADJis connected between Adjust pinand Ground.
ELECTRICAL CHARACTERISTICS FOR LM217M (Referto the test circuits, -40≤Tj≤ 125oC -Vo=5V,Io= 100 mA,Pd≤ 7.5W, unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
ΔVo Line Regulation Vi -Vo=3to40V Tj =25oC 0.01 0.02 %/V
0.02 0.05 %/V
ΔVo LoadRegulation Vo≤5V=10 mAto 500mA =25o C5 15 mV 50 mV≥5V=10 mAto 500mA =25oC 0.1 0.3 %/Vo
0.3 1 %/Vo
IADJ Adjustment Pin Current 50 100 μA
ΔIADJ Adjustment Pin Current Vi -Vo=3to40V=10 mAto 500mA
0.2 5 μA
VREF Reference Voltage Vi -Vo=3to40V=10 mAto 500mA
1.2 1.25 1.3 V
ΔVo
Output Voltage Temperature
Stability
0.7 %
Io(min) Minimum Load Current Vi -Vo =40V 3.5 5 mA
Io(max) Maximum OutputCurrent Vi -Vo ≤15V -Vo =40V,Pd 500 1000
200 Output Noise Voltage
(percentanceof VO)= 10Hzto 10KHz =25oC
0.003 %
SVR Supply Voltage Rejection(*) Tj =25oC= 120Hz
CADJ=0 65 dB
CADJ=10μF66 80 dB
LM217M/LM317M
3/11
Figure1: Current Limit Figure2: Minimum Operating Current
Figure3: Basic Adjustable Regulator.
LM317M
Figure4: Thermal Resistance& Maximum Power Dissipationvs P.C.B. Copper Lenghtfor DPAK
Pdmax calculatedfor Ta=50oC
LM217M/LM317M
4/11
APPLICATION INFORMATION
The LM317M provides an internal reference
voltage of 1.25V between the output and
adjustments terminals. Thisis used to seta
constant current flow acrossan external resistor
divider (see fig.3), givingan output voltageVO of: =VREF(1+ R2) +IADJR2
The device was designedto minimize the term
IADJ (100μA max) andto maintainit very constant
with line and load changes. Usually, the error
term IADJ⋅R2 can be neglected. To obtain the
previous requirement,all the regulator quiescent
current is returned to the output terminal,
imposinga minimum load current condition.If the
loadis insufficient, the output voltagewill rise.
Since the LM317Misa floating regulator and
”sees” only the input-to-outputdifferential voltage,
supplies of very high voltage with respectto
ground canbe regulatedas longas themaximum
input-to-output differential is not exceeded.
Furthermore, programmable regulator are easily
obtainable and, by connectinga fixed resistor
between the adjustment and output, the device
canbe usedasa precisioncurrent regulator. order to optimise the load regulation, the
current set resistor R1 (see fig.3) shouldbe tied close as possibleto the regulator, while the
ground terminalof R2 shouldbe near the ground the loadto provide remote ground sensing.
EXTERNAL CAPACITORS (Fig.5)
Normally no capacitors are needed unless the
device is situated far from the input filter
capacitors;in which case an input bypassis
needed. 0.1μF disc or 1μF tantalium input bypass
capacitor (CI)is recommendedto reduce the
sensitivityto input line impedance.
The adjustment terminal may be bypassedto
groundto improve ripple rejection. This capacitor
(Cadj) prevents ripple from being amplifiedas the
output voltageis increased.A 10μF capacitor
should improve ripple rejection about 80dBat
120Hzana 10V application.
Although the LM317Mis stable with no output
capacitance like any feedback circuit, certain
values of external capacitance can cause
excessive ringing. An output capacitance (CO)in
the formofa 1μF tantaliumor 25μF aluminium
electrolytic capacitor on the output swamps this
effect and insures stability.
PROTECTION DIODES (Fig.5)
When external capacitors are used with any IC
regulatorit is sometimes necessary to add
protection diodesto prevent the capacitors from
discharging through low current points into the
regulator.
Figure 5 show the LM317M with the
recommended protection diodes for output
voltagesin excessof 25Vor high capacitance
values (C3 >25μF, C2 >10μF). Diode D1
prevents C3 from discharging through the IC
during an input short-circuit. The combinationof
diodes D1 and D2 prevents C2 from discarging
through the regulator during an inputor output
short-circuit.
START-UP BLOCK
It’s not guaranteed the Re-Bootof the device
when the junction temperatureis over85oC.
LM217M/LM317M
5/11
Figure5: Voltage Regulatorwith Protection Diodes.
Figure6: SlowTurn-on 15V Regulator. Figure7: Current Regulator.= Vref+ IADJ≈ 1.25V
Figure8: 5V Electronic Shut-down Regulator. Figure9: Digitally Selected Outputs.
(R2 setsmaximumVo)
LM317M
LM317M
LM317M
LM317M
LM317M
LM217M/LM317M
6/11

Partno	Mfg	Dc	Qty	Available	Descript
LM317MX	NS	N/a	2500	avai	MEDIUM CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR