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Details, datasheet, quote on part number:LM337T2
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| Part: | LM337T2 |
| Category: | Power Management => Regulators => Linear Voltage Regulators |
| Description: | Three-terminal Adjustable Output Negative Voltage Regulator |
| Company: | ON Semiconductor |
| Datasheet: | Download LM337T2 datasheet File size : 113 kB |
| Request For quote: | Find where to buy LM337T2
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Datasheet text preview:
ON Semiconductort
1.5 A, Adjustable Output, Negative Voltage Regulator
The LM337 is an adjustable 3terminal negative voltage regulator capable of supplying in excess of 1.5 A 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 blowout proof. The LM337 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM337 can be used as a precision current regulator. · Output Current in Excess of 1.5 A · Output Adjustable between 1.2 V and 37 V · Internal Thermal Overload Protection · Internal Short Circuit Current Limiting Constant with Temperature · Output Transistor SafeArea Compensation · Floating Operation for High Voltage Applications · Eliminates Stocking many Fixed Voltages · Available in Surface Mount D2PAK and Standard 3Lead Transistor Package
LM337
THREETERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR
SEMICONDUCTOR TECHNICAL DATA
T SUFFIX PLASTIC PACKAGE CASE 221A Heatsink surface connected to Pin 2.
1 2 3
Pin 1. Adjust 2. Vin 3. Vout
Standard Application
IPROG Cin* 1.0 µF + R2 R1 120 IAdj CO** 1.0 µF +
D2T SUFFIX PLASTIC PACKAGE CASE 936 (D2PAK)
1
2 3
Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. LM337 Vout -Vout
-Vin
Vin
Cin is required if regulator is located more than 4 inches from power supply filter. *A 1.0 µF solid tantalum or 10 µF aluminum electrolytic is recommended. **CO is necessary for stability. A 1.0 µF solid tantalum or 10 µF aluminum electrolytic **is recommended. V out + 1.25 V 1 ) R2 R1
ORDERING INFORMATION
Device LM337BD2T LM337BT LM337D2T LM337T TJ = 40° to +125°C TJ = 0° to +125°C Operating Temperature Range Package Surface Mount Insertion Mount Surface Mount Insertion Mount
*
© Semiconductor Components Industries, LLC, 2002
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January, 2002 Rev. 3
Publication Order Number: LM337/D
LM337
MAXIMUM RATINGS
Rating InputOutput Voltage Differential Power Dissipation Case 221A TA = +25°C Thermal Resistance, JunctiontoAmbient Thermal Resistance, JunctiontoCase Case 936 (D2PAK) TA = +25°C Thermal Resistance, JunctiontoAmbient Thermal Resistance, JunctiontoCase Operating Junction Temperature Range Storage Temperature Range Symbol VIVO Value 40 Unit Vdc
PD JA JC PD JA JC TJ Tstg
Internally Limited 65 5.0 Internally Limited 70 5.0 40 to +125 65 to +150
W °C/W °C/W W °C/W °C/W °C °C
ELECTRICAL CHARACTERISTICS (|VIVO| = 5.0 V; IO = 0.5 A for T package; TJ = Tlow to Thigh [Note 1]; Imax and Pmax [Note 2].)
Characteristics Line Regulation (Note 3), TA = +25°C, 3.0 V |VIVO| 40 V Load Regulation (Note 3), TA = +25°C, 10 mA IO Imax |VO| 5.0 V |VO| 5.0 V Thermal Regulation, TA = +25°C (Note 6), 10 ms Pulse Adjustment Pin Current Adjustment Pin Current Change, 2.5 V |VIVO| 40 V, 10 mA IL Imax, PD Pmax, TA = +25°C Reference Voltage, TA = +25°C, 3.0 V |VIVO| 40 V, 10 mA IO Imax, PD Pmax, TJ = Tlow to Thigh Line Regulation (Note 3), 3.0 V |VIVO| 40 V Load Regulation (Note 3), 10 mA IO Imax |VO| 5.0 V |VO| 5.0 V Temperature Stability (Tlow TJ Thigh) Minimum Load Current to Maintain Regulation (|VIVO| 10 V) (|VIVO| 40 V) Maximum Output Current |VIVO| 15 V, PD Pmax, T Package |VIVO| 40 V, PD Pmax, TJ = +25°C, T Package RMS Noise, % of VO, TA = +25°C, 10 Hz f 10 kHz Ripple Rejection, VO = 10 V, f = 120 Hz (Note 4) Without CAdj CAdj = 10 µF LongTerm Stability, TJ = Thigh (Note 5), TA = +25°C for Endpoint Measurements Thermal Resistance JunctiontoCase, T Package 4 3 1, 2 3 1 2 Figure 1 2 Symbol Regline Regload Regtherm IAdj IAdj Vref Regline Regload 3 3 TS ILmin 3 Imax N RR 66 3 S R J C 60 77 0.3 4.0 1.0 %/1.0 k Hrs. °C/W 1.5 0.15 0.003 2.2 0.4 % VO dB 1.5 2.5 6.0 10 A 20 0.3 0.6 70 1.5 mV % VO % VO mA 1.213 1.20 15 0.3 0.003 65 2.0 1.250 1.25 0.02 50 1.0 0.04 100 5.0 1.287 1.30 0.07 mV % VO % VO/W µA µA V %/V Min Typ 0.01 Max 0.04 Unit %/V
NOTES: 1. Tlow to Thigh = 0° to +125°C, for LM337T, D2T. Tlow to Thigh = 40° to +125°C, for LM337BT, BD2T. 2. Imax = 1.5 A, Pmax = 20 W 3. Load and line regulation are specified at constant junction temperature. Change in VO because of heating effects is covered under the Thermal Regulation specification. Pulse testing with a 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. 6. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.
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LM337
Representative Schematic Diagram
100 2.0k 2.5k 810 21k Vout 10k 15pF 5.0k 75 0 60k 100k 800 15pF 2.0k 800 25pF 220 60 Adjust
18k 4.0k 6.0k 1.0k 9.6k 270 20k 8.0k 600 2.9k 4.0k 500 100k 155 3.0k 100pF 2.2k 5.0pF 5.0k 15 2.4k 15 500 0.05 Vin This device contains 39 active transistors. 18k 240 100 30k 2.0 pF 250 0.2
R2
1% +
Cin * Pulse testing required. 1% Duty Cycle is suggested.
1.0 µF
IAdj Adjust Vin VIH VIL LM337 R1 Vout
CO 120 1%
1.0 µF RL
* VEE
VOH VOL Line Regulation (% V) + | V V| OL OH x 100 |V | OH
Figure 1. Line Regulation and IAdj/Line Test Circuit
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