LM317M PDF даташит
Спецификация LM317M изготовлена «ON Semiconductor» и имеет функцию, называемую «3-Terminal Adjustable Regulator». |
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Детали детали
Номер произв | LM317M |
Описание | 3-Terminal Adjustable Regulator |
Производители | ON Semiconductor |
логотип |
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LM317M
500 mA Adjustable Output,
Positive Voltage Regulator
The LM317M is an adjustable three−terminal positive voltage
regulator capable of supplying in excess of 500 mA over an output
voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally
easy to use and requires only two external resistors to set the output
voltage. Further, it employs internal current limiting, thermal
shutdown and safe area compensation, making it essentially blow−out
proof.
The LM317M serves a wide variety of applications including local,
on−card regulation. This device also makes an especially simple
adjustable switching regulator, a programmable output regulator, or by
connecting a fixed resistor between the adjustment and output, the
LM317M can be used as a precision current regulator.
Features
• Output Current in Excess of 500 mA
• Output Adjustable between 1.2 V and 37 V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe−Area Compensation
• Floating Operation for High Voltage Applications
• Eliminates Stocking Many Fixed Voltages
• Pb−Free Packages are Available
Vin
Vin
LM317M
Vout
Vout
*
Cin
0.1mF
IAdj Adjust
R1
240
**
+ CO
1.0mF
R2
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Heatsink surface
connected to Pin 2
TO−220AB
T SUFFIX
CASE 221A
SOT−223
ST SUFFIX
CASE 318E
1
2
3
1
23
DPAK
DT SUFFIX
CASE 369C
4
12
3
Heatsink Surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
PIN ASSIGNMENT
1 Adjust
2 Vout
3 Vin
* = Cin is required if regulator is located an appreciable distance from power supply filter.
** = CO is not needed for stability, however, it does improve transient response.
ǒ ǓVout + 1.25 V
1
)
R2
R1
) IAdj R2
Since IAdj is controlled to less than 100 mA, the error associated with this
term is negligible in most applications.
Figure 1. Simplified Application
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 13 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
August, 2004 − Rev. 12
1
Publication Order Number:
LM317M/D
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LM317M
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Input−Output Voltage Differential
VI−VO
40
Vdc
Power Dissipation (Package Limitation) (Note 1)
Plastic Package, T Suffix, Case 221A
TA = 25°C
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Case
Plastic Package, DT Suffix, Case 369C
PD Internally Limited
qJA 70 °C/W
qJC 5.0 °C/W
TA = 25°C
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Case
Plastic Package, ST Suffix, Case 318E
PD Internally Limited
qJA 92 °C/W
qJC 5.0 °C/W
TA = 25°C
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Case
PD Internally Limited
qJA 245 °C/W
qJC 15 °C/W
Operating Junction Temperature Range
TJ −40 to +125 °C
Storage Temperature Range
Tstg −65 to +150 °C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. Figure 25 provides thermal resistance versus pc board pad size.
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LM317M
ELECTRICAL CHARACTERISTICS (VI − VO = 5.0 V; IO = 0.1 A, TJ = Tlow to Thigh (Note 2), unless otherwise noted.)
LM317M / LM317MB
Characteristics
Figure
Symbol
Min
Typ
Max Unit
Line Regulation (Note 3) (TA = 25°C, 3.0 V ≤ VI − VO ≤ 40 V)
3
Regline
− 0.01 0.04 %/V
Load Regulation (Note 3)
TA = 25°C, 10 mA ≤ IO ≤ 0.5 A
VO ≤ 5.0 V
VO ≥ 5.0 V
4 Regload
− 5.0 25 mV
− 0.1 0.5 % VO
Adjustment Pin Current
5 IAdj − 50 100 mA
Adjustment Pin Current Change
2.5 V ≤ VI − VO ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A, PD ≤ Pmax
3, 4 DIAdj − 0.2 5.0 mA
Reference Voltage
3.0 V ≤ VI − VO ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A, PD ≤ Pmax
5
Vref
1.200 1.250 1.300
V
Line Regulation (Note 3)
3.0 V ≤ VI−VO ≤ 40 V
3
Regline
− 0.02 0.07 %/V
Load Regulation (Note 3)
10 mA ≤ IO ≤ 0.5 A
VO ≤ 5.0 V
VO ≥ 5.0 V
4 Regload
− 20 70 mV
− 0.3 1.5 % VO
Temperature Stability (Tlow ≤ TJ ≤ Thigh)
5 TS − 0.7 − % VO
Minimum Load Current to Maintain Regulation (VI − VO = 40 V)
5
ILmin
− 3.5 10 mA
Maximum Output Current
VI − VO ≤ 15 V, PD ≤ Pmax
VI − VO = 40 V, PD ≤ Pmax, TA = 25°C
5 Imax
A
0.5 0.9
−
0.15 0.25
−
RMS Noise, % of VO (TA = 25°C, 10 Hz ≤ f ≤ 10 kHz)
− N − 0.003 − % VO
Ripple Rejection, VO = 10 V, f = 120 Hz (Note 4)
Without CAdj
CAdj = 10 mF
6 RR
dB
− 65 −
66 80
−
Long−Term Stability, TJ = Thigh (Note 5)
TA= 25°C for End−point Measurements
5 S − 0.3 1.0 %/1.0
kHrs.
2. Tlow to Thigh = 0° to +125°C for LM317M Tlow to Thigh = − 40° to +125°C for LM317MB.
3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
4. CAdj, when used, is connected between the adjustment pin and ground.
5. Since Long−Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average
stability from lot−to−lot.
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