LM137H#PBF - LINEAR TECHNOLOGY

DESCRIPTION

The SG137A family of negative adjustable regulators will deliver up to 1.5A

output current over an output voltage range of -1.2V to -37V. Silicon General

has made significant improvements in these regulators compared to previous

devices, such as better line and load regulation, and a maximum output voltage

error of 1%. The SG137 family uses the same chip design and guarantees

maximum output voltage error of ±2%.

Every effort has been made to make these devices easy to use and difficult to

damage. Internal current and power limiting coupled with true thermal limiting

prevents device damage due to overloads or shorts even if the regulator is not

fastened to a heat sink.

The SG137A/137 family of products are ideal complements to the SG117A/

117 adjustable positive regulators.

FEATURES

••

•1 % output voltage tolerance

••

•0.01%/V line regulation

••

•0.5% load regulation

••

•0.02%/W thermal regulation

••

•Available in hermetic TO-220

HIGH RELIABILITY FEATURES

-SG137A/SG137

♦♦

♦Available to MIL-STD-883 and DESC SMD

♦♦

♦Scheduled for MIL-M38510 QPL listing

♦♦

♦MIL-M38510/11804BYA - JAN137K

♦♦

♦LMI level "S" processing available

SG137A/SG237A/SG337A

SG137/SG237/SG337

1.5 AMP NEGATIVE

ADJUSTABLE REGULATOR

BLOCK DIAGRAM

2/92 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

∞ ∞

∞ Garden Grove, CA 92841

1(714) 898-8121 ∞∞

∞∞

∞ FAX: (714) 893-2570

SG137A/SG137 SERIES

2/92 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

∞ ∞

∞ Garden Grove, CA 92841

2(714) 898-8121 ∞∞

∞∞

∞ FAX: (714) 893-2570

Power Dissipation ..........................................

Input to Output Voltage Differential ....................................

Storage Temperature Range ............................

ABSOLUTE MAXIMUM RATINGS (Note 1)

Internally Limited

40V

-65°C to 150°C

Operating Junction Temperature

Hermetic (K, R, T, L, IG-Packages) ...........................

Lead Temperature (Soldering, 10 Seconds) ............. 150°C

300°C

Note 1. Exceeding these ratings could cause damage to the device.

RECOMMENDED OPERATING CONDITIONS (Note 2 & 3)

Input Voltage Range .............................. -(VOUT + 3.5V) to -36V Operating Junction Temperature Range

SG137A/SG137 ............................................

SG237A/SG237 ............................................

SG337A/SG337 .............................................

-55°C to 150°C

-25°C to 150°C

0°C to 125°C

Note 2. Range over which the device is functional.

Note 3. These ratings are applicable for junction temperatures of less than 135°C.

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over full operating ambient temperatures for SG137A/SG137 with -55°C ≤ TA ≤ 150°C, SG237A/

SG237 with -25°C ≤ TA ≤ 150°C, SG337A/SG337 with 0°C ≤ TA ≤ 125°C, |VIN - VOUT| = 5.0V, and for IOUT = 500mA (K, R, and IG power packages) and IOUT

= 100mA (T and L packages). Although power dissipation is internally limited, these specifications are applicable for power dissipations of 2Ω for the T and

L packages, and 20Ω for the K, R, and IG packages. IMAX is 1.5A for the K, R, and IG packages and 0.5A for the T and L packages. Low duty cycle pulse

testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

THERMAL DATA

K Package:

Thermal Resistance-Junction to Leads, θJC................ 3.0°C/W

Thermal Resistance-Junction to Ambient, θJA ............... 35°C/W

R Package:

Thermal Resistance-Junction to Leads, θJC................ 5.0°C/W

Thermal Resistance-Junction to Ambient, θJA .............. 40°C/W

T Package:

Thermal Resistance-Junction to Leads, θJC................. 15°C/W

Thermal Resistance-Junction to Ambient, θJA ............ 120°C/W

IG Package:

Thermal Resistance-Junction to Leads, θJC................ 3.5°C/W

Thermal Resistance-Junction to Ambient, θJA .............. 42°C/W

L Package:

Thermal Resistance-Junction to Leads, θJC................. 35°C/W

Thermal Resistance-Junction to Ambient, θJA ............ 120°C/W

Units

SG137/SG237

Min. Typ. Max.

SG137A/SG237A

Parameter Test Conditions

IOUT = 10mA, TA = 25°C

3V ≤ |VIN - VOUT| ≤ 40V, 10mA ≤ IOUT ≤ IMAX

3V ≤ |V IN - VOUT| ≤ 40V, IOUT ≤ IMAX

TA = 25°C

10mA ≤ IOUT ≤ IMAX

|VOUT| ≤ 5V, TA = 25°C

|VOUT| ≥ 5V, TA = 25°C

|VOUT| ≤ 5V

|VOUT| ≥ 5V

TA = 25°C, 10ms pulse

VOUT = -10V, f =120Hz

CADJ = 0, TA = 25°C

CADJ = 10µF

TA = 25°C

3V ≤ |VIN - V OUT| ≤ 40V

10mA ≤ IOUT ≤ IMAX

Reference Voltage (Note 6)

Line Regulation (Note 4, 6)

Load Regulation (Note 4)

Thermal Regulation (Note 5)

Ripple Rejection

Adjust Pin Current

Adjust Pin Current Change

(Note 6)

-1.238

-1.220

-1.250

0.005

0.1

0.2

0.002

1.0

0.2

-1.262

-1.280

0.01

0.5

1.0

0.02

100

-1.225

-1.200

-1.250

0.01

0.3

0.002

0.5

-1.275

-1.300

0.02

0.5

1.0

0.02

100

%/V

%/W

µA

Note A. Junction Temperature Calculation: TJ = TA + (P D x θJA).

Note B. The above numbers for θJC are maximums for the limiting

thermal resistance of the package in a standard mount-

ing configuration. The θJA numbers are meant to be

guidelines for the thermal performance of the device/pc-

board system. All of the above assume no ambient

airflow.

SG137A/SG137 SERIES

2/92 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

∞ ∞

∞ Garden Grove, CA 92841

3(714) 898-8121 ∞∞

∞∞

∞ FAX: (714) 893-2570

-1.262

-1.280

0.01

0.5

1.0

0.02

100

3.5

1.5

1.0

0.5

1.5

1.0

-1.250

0.01

0.3

0.003

0.5

2.5

2.2

0.8

0.4

0.17

0.6

0.3

0.003

-1.287

-1.300

0.04

1.0

1.5

0.04

100

1.0

Reference Voltage (Note 6)

Line Regulation (Note 4, 6)

Load Regulation (Note 4)

Thermal Regulation (Note 5)

Ripple Rejection

Adjust Pin Current

Adjust Pin Current Change

(Note 6)

Minimum Load Current

Current Limit

Temperature Stability (Note 5)

Long Term Stability (Note 5)

RMS Output Noise (% of VOUT)

ELECTRICAL CHARACTERISTICS (continued)

Units

SG337

Min. Typ. Max.

SG337A

Test ConditionsParameter Units

SG137/SG237

Min. Typ. Max.Min. Typ. Max.

SG137A/SG237A

|VIN - VOUT| ≤ 40V

|VIN - VOUT| ≤ 10V

|VIN - VOUT| ≤ 15V

K, P, R, IG Packages

T, L, Packages

|VIN - VOUT| ≤ 40V, TJ = 25°C

K, P, R, IG Packages

T, L, Packages

TA = 125°C, 1000 Hours

TA = 25°C, 10Hz ≤ f ≤ 10 KHz (Note 5)

Minimum Load Current

Current Limit

Temperature Stability (Note 5)

Long Term Stability (Note 5)

RMS Output Noise (% of VOUT)

1.5

0.5

0.24

0.15

2.5

1.2

2.2

0.8

0.4

0.25

0.6

0.3

0.003

5.0

3.2

1.5

1.0

0.5

1.5

1.0

1.5

0.5

0.24

0.15

2.5

1.2

2.2

0.8

0.4

0.25

0.6

0.3

0.003

5.0

3.0

1.0

-1.238

-1.220

1.5

0.5

0.24

0.15

-1.250

0.005

0.1

0.2

0.002

1.0

0.2

2.5

1.2

2.2

0.8

0.5

0.25

0.6

0.3

0.003

-1.213

-1.200

1.5

0.5

0.15

0.10

%/V

%/W

µA

IOUT = 10mA, TA = 25°C

3V ≤ |VIN - VOUT| ≤ 40V, 10mA ≤ IOUT ≤ IMAX

3V ≤ |V IN - VOUT| ≤ 40V, IOUT ≤ IMAX

TA = 25°C

10mA ≤ IOUT ≤ IMAX

|VOUT| ≤ 5V, TA = 25°C

|VOUT| ≥ 5V, TA = 25°C

|VOUT| ≤ 5V

|VOUT| ≥ 5V

TA = 25°C, 10ms pulse

VOUT = -10V, f =120Hz

CADJ = 0, TA = 25°C

CADJ = 10µF

TA = 25°C

3V ≤ |VIN - V OUT| ≤ 40V

10mA ≤ IOUT ≤ IMAX

|VIN - VOUT| ≤ 40V

|VIN - VOUT| ≤ 10V

|VIN - VOUT| ≤ 15V

K, P, R, IG-Packages

T, L-Packages

|VIN - VOUT| ≤ 40V, TJ = 25°C

K, P, R, IG- Packages

T, L-Packages

TA = 125°C, 1000hr

TA = 25°C, 10Hz ≤ f ≤ 10KHz (Note 5)

Test ConditionsParameter

Note4. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating

effects are covered under the specification for thermal regulation.

Note 5. These parameters, although guaranteed, are not tested in production.

Note 6. IMAX for K, R, and IG packages is VIN - VOUT = 3V / 1.5A and VIN - VOUT = 40V / 240mA. For T and L packages I MAX is VIN - VOUT = 3V / 500mA

and VIN - VOUT = 40V / 150mA.

SG137A/SG137 SERIES

2/92 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

∞ ∞

∞ Garden Grove, CA 92841

4(714) 898-8121 ∞∞

∞∞

∞ FAX: (714) 893-2570

FIGURE 6.

ADJUSTMENT CURRENT VS. TEMPERATURE

FIGURE 5.

INPUT/OUTPUT DIFFERENTIAL

VS. OUTPUT CURRENT

FIGURE 3.

CURRENT VS. INPUT/OUTPUT DIFFERENTIAL

FIGURE 2.

REFERENCE VOLTAGE VS. TEMPERATURE

FIGURE 1.

INPUT/OUTPUT DIFFERENTIAL

VS. OUTPUT CURRENT

FIGURE 4. *

OUTPUT VOLTAGE DEVIATION

VS. OUTPUT CURRENT

CHARACTERISTIC CURVES

* The SG137A has load regulation compensation which

makes the typical unit read close to zero. This band

represents the typical production spread.

APPLICATION INFORMATION

OUTPUT VOLTAGE

The output voltage is determined by two external resistors, R 1 &

R2(see Figure 7).

The exact formula for the output voltage is:

VOUT = VREF + IADJ (R2)

( )

Where: VREF =Reference Voltage, IADJ = Adjustment Pin Current.

In most applications, the second term is small enough to be

ignored, typically about 0.5% of VOUT. In more critical applica-

tions, the exact formula should be used, with IADJ equal to 65µA.

Solving for R2 yields:

Smaller values of R1 and R2 will reduce the influence of I ADJ on the

output voltage, but the no-load current drain on the regulator will

be increased. Typical values for R1 are between 100Ω and 300Ω,

giving 12.5 mA and 4.2mA no-load current respectively. There

is an additional consideration in selecting R1 the minimum load

current specification of the regulator. The operating current of

R2 =VOUT - VREF

VREF

R1+ IADJ

FIGURE 6

R2 + R1

SG137A/SG137 SERIES

2/92 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

∞ ∞

∞ Garden Grove, CA 92841

5(714) 898-8121 ∞∞

∞∞

∞ FAX: (714) 893-2570

APPLICATION INFORMATION (continued)

the SG137A flows from input to output. If this current is not

absorbed by the load, the output of the regulator will rise above

the regulated value. The current drawn by R1 and R2 is normally

high enough to absorb the current, but care must be taken in no–

load situations where R 1 and R2 have high values. The maximum

value for the operating current, which must be absorbed, is 5mA

for the SG137A, If input-output voltage differential is less than

10V, the operating current that must be absorbed drops to 3mA.

The output stability, load regulation, line regulation, thermal

EXAMPLES:

1. A precision 10V regulator to supply up to 1Amp load current.

a. Select R1 = 100Ω to minimize effect of IADJ

b. Calculate R2 = = = 704W

2. A 15V regulator to run off batteries and supply 50mA.

VIN MAX = 25V

a. To minimize battery drain, select R1 as high as possible

R1 = = 417Ω, use 404Ω, 1%

VOUT - VREF

(VREF/R1) + IADJ

10V - 1.25V

(1.25V/100W) + 65mA

1.25V

3mA

TYPICAL APPLICATIONS

regulation, temperature drift, long term drift, and noise, can be

improved by a factor of 6.6 over the standard regulator configu-

ration. This assumes a zener whose drift and noise is considera-

bly better than the regulator itself. The LM329B has 20PPM/°C

maximum drift and about 10 times lower noise than the regulator.

In the application shown Figure 8, regulators #2 to #N will track

regulator #1 to within ±24mV initially, and to ±60mV over all load,

line, and temperature conditions. If any regulator output is

shorted to ground, all other outputs will drop to -2V. Load

regulation of regulators #2 to #N will be improved by VOUT/1.25V

compared to a standard regulator, so regulator #1 should be the

one which has the lowest load current.

FIGURE 11 - DUAL TRACKING SUPPLY ±1.25V to ±20VFIGURE 10 - CURRENT REGULATOR

FIGURE 9 - HIGH STABILITY REGULATOR

FIGURE 8 - MULTIPLE TRACKING REGULATORS

SG137A/SG137 SERIES

2/92 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

∞ ∞

∞ Garden Grove, CA 92841

6(714) 898-8121 ∞∞

∞∞

∞ FAX: (714) 893-2570

CONNECTION DIAGRAMS & ORDERING INFORMATION (See Notes Below)

Ambient

Temperature Range

Part No.Package Connection Diagram

3-TERMINAL TO-3

METAL CAN

K-PACKAGE

SG137AK/883B -55°C to 125°C

SG137AK/DESC -55°C to 125°C

SG137AK -55°C to 125°C

SG237AK -25°C to 85°C

SG337AK 0°C to 70C

SG137K/883B -55°C to 125°C

JAN137K -55°C to 125°C

SG137K/DESC -55°C to 125°C

SG137K -55°C to 125°C

SG237K -25°C to 85°C

SG337K 0°C to 70°C

ADJUSTMENT

CASE IS VIN

VOUT

3-TERMINAL TO-66

METAL CAN

R-PACKAGE

SG137AR/883B -55°C to 125°C

SG137AR/DESC -55°C to 125°C

SG137AR -55°C to 125°C

SG237AR -25°C to 85°C

SG337AR 0°C to 70°C

SG137R/883B -55°C to 125°C

SG137R/DESC -55°C to 125°C

SG137R -55°C to 125°C

SG237R -25°C to 85°C

SG337R 0°C to 70°C

ADJUSTMENT

VOUT

CASE IS VIN

3-PIN TO-39 METAL CAN

T-PACKAGE SG137AT/883B -55°C to 125°C

SG137AT/DESC -55°C to 125°C

SG137AT -55°C to 125°C

SG237AT -25°C to 85°C

SG337AT 0°C to 70°C

SG137T/883B -55°C to 125°C

SG137T/DESC -55°C to 125°C

SG137T -55°C to 125°C

SG237T -25°C to 85°C

SG337T 0°C to 70°C

32 VIN

VOUT

ADJUSTMENT 1

3-PIN HERMETIC TO-257

IG-PACKAGE (Isolated) SG137AIG/883B -55°C to 125°C

SG137AIG/DESC -55°C to 125°C

SG137AIG -55°C to 125°C

SG137IG/883B -55°C to 125°C

SG137IGDESC -55°C to 125°C

SG137IG -55°C to 125°C

20-PIN CERAMIC (LCC)

LEADLESS CHIP CARRIER

L- PACKAGE

SG137AL/883B -55°C to 125°C

SG137AL/DESC -55°C to 125°C

SG137AL -55°C to 125°C

SG137L/883B -55°C to 125°C

SG137L/DESC -55°C to 125°C

SG137L -55°C to 125°C

321

911121310

20 19 11. VIN

12. N.C.

13. N.C.

14. N.C.

15. N.C.

16. ADJUST

17. N.C.

18. N.C.

19. N.C.

20. N.C.

1. VOUT

2. VOUT

3. N.C.

4. N.C.

5. N.C.

6. N.C.

7. N.C.

8. N.C.

9. N.C.

10. N.C.

(Note 4)

ADJUST

VOUT

VIN

Not e 1. Contact factory for JAN and DESC product availability.

2. All parts are viewed from the top. 3. Product is also available in flatpack. Consult factory for price and delivery.

4. Both outputs must be externally connected together at the device terminals.