Datasheet

ManualsBrandsFAIRCHILD SEMICONDUCTOR ManualsPMICsPMIC - LDO voltage regulator Positivbe, adjustable TO 252 3

www.fairchildsemi.com

Rev. 1.0.5

Features

• Output Current in Excess of 0.5A

• Output Adjustable Between 1.2V and 37V

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting

• Output Transistor Safe Area Compensation

• Floating Operation for High Voltage Applications

Description

The LM317M is a 3-terminal adjustable positive voltage

regulator capable of supplying in excess of 500mA over an

output voltage range of 1.2V to 37V. This voltage regulator

is exceptionally easy to use and requires only two external

resistors to set the output voltage.

D-PAK

1. Adj 2. Output 3. Input

TO-220 (Single Gauge)

Internal Block Diagram

Rlimit

3Vin

Voltage

Reference

Vad

Protection

Circuitry

Input

Output

LM317M

3-Terminal 0.5A Positive Adjustable Regulator

Summary of content (8 pages)

PAGE 1
www.fairchildsemi.com LM317M 3-Terminal 0.5A Positive Adjustable Regulator Features Description • • • • • • The LM317M is a 3-terminal adjustable positive voltage regulator capable of supplying in excess of 500mA over an output voltage range of 1.2V to 37V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Output Current in Excess of 0.5A Output Adjustable Between 1.
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LM317M Absolute Maximum Ratings Parameter Symbol Value Unit Input-Output Voltage Differential V I - VO 40 V PD Internally Limited W RθJC RθJA RθJA 5 81 100 °C/W °C/W °C/W Tj 0 ~ +125 °C TSTG -65 ~ +125 °C Power Dissipation Thermal Resistance Junction-Case (TO-220) Thermal Resistance Junction-Air (TO-220) Thermal Resistance Junction-Air (D-PAK (Note1,2)) Operating Junction Temperature Range Storage Temperature Range Electrical Characteristics (VI-VO = 5V, IO = 0.
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LM317M Typical Performance Characteristics Figure 1. Minimum Load Current Figure 3. Adjustment Pin Current vs. Temperature Figure 5. Load Regulation vs. Temperature Figure 2. Peak Output Current vs. Input-Output Differential Voltage Figure 4. Ripple Rejection vs. Frequency Figure 6. Line Regulation vs.
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LM317M Typical Performance Characteristics (Continued) Figure 7. Outputvoltage vs. Temperature 4 Figure 8.
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LM317M Typical Application D1 1N4002 VO Input LM317M Output + 120 1.0uF VADJ 1K 720 KSP2222 TTL CONTROL MINIMUM VO = 1.25V Figure 1. 1 5V Electronic Shutdown Regulator D1 protects the device during an input short circuit. VO LM317M Output Input 240 1N4001 50K VADJ KSP2907 + R2 1.0uF Figure 2. Slow Turn-On Regulator IO Input R1 VO LM317M R2 Output VADJ IADJ I I OMAX V REF 1.25V = ⎛ -----------------⎞ + I ≅ ---------------⎝ R1 ⎠ ADJ R1 V REF 1.
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LM317M Mechanical Dimensions Package Dimensions in millimeters D-PAK 0.89 ±0.10 MIN0.55 0.91 ±0.10 0.50 ±0.10 9.50 ±0.30 0.76 ±0.10 0.50 ±0.10 1.02 ±0.20 2.30TYP [2.30±0.20] (1.00) (3.05) (2XR0.25) (0.10) 6.60 ±0.20 (5.34) (5.04) (1.50) (0.70) 2.30 ±0.20 (0.90) 2.70 ±0.20 2.30 ±0.10 2.70 ±0.20 2.30TYP [2.30±0.20] (0.50) 6.10 ±0.20 MAX0.96 (4.34) 9.50 ±0.30 0.80 ±0.20 0.60 ±0.20 (0.50) 6.10 ±0.20 5.34 ±0.30 0.70 ±0.20 6.60 ±0.20 0.76 ±0.
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LM317M Mechanical Dimensions (Continued) Package Dimensions in millimeters TO-220 [ SINGLE GAUGE ] 7
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LM317M Ordering Information Product Number Package LM317MDT D-PAK LM317MT TO-220 (Single Gauge) Operating Temperature 0 ~ 125°C DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.