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Details, datasheet, quote on part number:LM237
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| Part: | LM237 |
| Category: | Power Management => Regulators => Linear Voltage Regulators => Negative |
| Description: | 3-terminal Adjustable Regulators |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download LM237 datasheet File size : 137 kB |
| Request For quote: | Find where to buy LM237
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Datasheet text preview:
LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
SLVS047D NOVEMBER 1981 REVISED MAY 2002
D D D D D D D
Output Voltage Range Adjustable From 1.2 V to 37 V Output Current Capability of 1.5 A Max Input Regulation Typically 0.01% Per Input-Voltage Change Output Regulation Typically 0.3% Peak Output Current Constant Over Temperature Range of Regulator Ripple Rejection Typically 77 dB Direct Replacement for National Semiconductor LM237 and LM337
KC PACKAGE (TOP VIEW) OUTPUT INPUT ADJUSTMENT The INPUT terminal is in electrical contact with the mounting base. TO-220AB O I A
description
The LM237 and LM337 are adjustable 3-terminal negative-voltage regulators capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. They are exceptionally easy to use, requiring only two external resistors to set the output voltage and one output capacitor for frequency compensation. The current design has been optimized for excellent regulation and low thermal transients. In addition, the LM237 and LM337 feature internal current limiting, thermal shutdown, and safe-area compensation, making them virtually immune to failure by overloads. The LM237 and LM337 serve a wide variety of applications, including local on-card regulation, programmable output-voltage regulation, and precision current regulation. The LM237 is characterized for operation over the virtual junction temperature range of 25°C to 150°C. The LM337 is characterized for operation over the virtual junction temperature range of 0°C to 125°C.
AVAILABLE OPTIONS PACKAGED DEVICES TJ 25°C to 150°C 0°C to 125°C HEAT-SINK MOUNTED (KC) LM237KC LM337KC PLASTIC FLANGE MOUNTED (KTE) -- LM337KTE KTE PACKAGE (TOP VIEW)
OUTPUT INPUT ADJUSTMENT The INPUT terminal is in electrical contact with the mounting base. O I A
The KTE package is only available taped and reeled. Add the R suffix to the device type (e.g., LM337KTER). Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2002, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
SLVS047D NOVEMBER 1981 REVISED MAY 2002
schematic diagram
ADJUSTMENT
OUTPUT
INPUT
absolute maximum ratings over operating temperature ranges (unless otherwise noted)
Input-to-output differential voltage, VI VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V Package thermal impedance, JA (see Notes 1 and 2): KC package . . . . . . . . . . . . . . . . . . . . . . . . . . . 22°C/W (see Notes 1 and 3): KTE package . . . . . . . . . . . . . . . . . . . . . . . . . 23°C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. Maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) TA)/JA. Operating at the absolute maximum TJ of 150°C can affect reliability. Due to variations in individual device electrical characteristics and thermal resistance, the built-in thermal overload protection may be activated at power levels slightly above or below the rated dissipation. 2. The package thermal impedance is calculated in accordance with JESD 51-7. 3. The package thermal impedance is calculated in accordance with JESD 51-5.
recommended operating conditions
MIN IO TJ Output current current Operating virtual junction temperature virtual junction tem |VI VO| 40 V, |VI VO| 10 V, P 15 W P 15 W LM237 LM337 10 6 25 0 MAX 1500 1500 150 125 UNIT mA °C
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
SLVS047D NOVEMBER 1981 REVISED MAY 2002
electrical characteristics over recommended ranges of operating virtual junction temperature (unless otherwise noted)
PARAMETER Input regulation regulation Ripple rejection rejection TEST CONDITIONS CONDITIONS VI VO = 3 V to 40 V to VO = 10 V, VO = 10 V, TJ = 25°C TJ = MIN to MAX f = 120 HZ f = 120 HZ, CADJ = 10 µF |VO| 5 V |VO| 5 V |VO| 5 V |VO| 5 V 0.6% 0.3% 66 LM237 MIN TYP 0.01 0.02 60 77 25 0.5% 50 1% 0.6% 0.3% 66 MAX 0.02 0.05 MIN LM337 TYP 0.01 0.02 60 77 50 1% 70 1.5% mV MAX 0.04 0.07 UNIT %/ V dB mV
Output regulation regulation
IO = 10 mA to 1.5 A, , TJ = 25°C IO = 10 mA to 1 5 A 10 mA to 1.5
Output-voltage change with temperature Output-voltage long-term drift Output noise voltage Minimum output current to maintain current to maintain regulation Peak output current output current Adjustment-terminal current Change in adjustment-terminal current g Reference voltage (output to ADJ)
TJ = MIN to MAX After 1000 h at TJ = MAX and VI VO = 40 V f = 10 HZ to 10 kHZ, |VI VO| 40 V |VI VO| 10 V |VI VO| 15 V |VI VO| 40 V, TJ = 25°C 1.5 0.24 TJ = 25°C
0.3% 0.003% 2.5 1.2 2.2 0.4 65
1%
0.3% 0.003%
1%
5 3 1.5 0.15 100
2.5 1.5 2.2 0.4 65
10 mA 6 A 100 µA µA
VI VO = 2.5 V to 40 V, IO = 10 mA to MAX VI VO = 3 V to 40 V, IO = 10 mA to 1.5 A, 10 mA to 1 5 A P rated dissipation
TJ = 25°C,
2 1.225 1.2 1.25 1.25
5 1.275 1.3 1.213 1.2
2 1.25 1.25
5 1.287
TJ = 25°C TJ = MIN to MAX
V 1.3
Thermal regulation Initial TJ = 25°C, 10-ms pulse 0.002 0.02 0.003 0.04 %/W Unless otherwise noted, these specifications apply for the following test conditions |VI VO| = 5 V and IO = 0.5 A. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. All characteristics are measured with a 0.1-µF capacitor across the input and a 1-µF capacitor across the output. Pulse-testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account separately. Input regulation is expressed here as the percentage change in output voltage per 1-V change at the input.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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