LM117HVQML - National Semiconductor

LM117HVQML

3-Terminal Adjustable Regulator

General Description

The LM117HV are adjustable 3-terminal positive voltage

regulators capable of supplying either 0.5A or 1.5A over a

1.2V to 57V output range. They are exceptionally easy to

use and require only two external resistors to set the output

voltage. Further, both line and load regulation are better than

standard fixed regulators.

In addition to higher performance than fixed regulators, the

LM117HV series offers full overload protection available only

in IC’s. Included on the chip are current limit, thermal over-

load protection and safe area protection. All overload protec-

tion circuitry remains fully functional even if the adjustment

terminal is disconnected.

Normally, no capacitors are needed unless the device is

situated more than 6 inches from the input filter capacitors in

which case an input bypass is needed. An optional output

capacitor can be added to improve transient response. The

adjustment terminal can be bypassed to achieve very high

ripple rejections ratios which are difficult to achieve with

standard 3-terminal regulators.

Besides replacing fixed regulators, the LM117HV is useful in

a wide variety of other applications. Since the regulator is

“floating” and sees only the input-to-output differential volt-

age, supplies of several hundred volts can be regulated as

long as the maximum input to output differential is not ex-

ceeded, i.e. do not short the output to ground.

Also, it makes an especially simple adjustable switching

regulator, a programmable output regulator, or by connecting

a fixed resistor between the adjustment and output, the

LM117HV can be used as a precision current regulator.

Supplies with electronic shutdown can be achieved by

clamping the adjustment terminal to ground which programs

the output to 1.2V where most loads draw little current.

Features

nAdjustable output down to 1.2V

nGuaranteed 0.5A or 1.5A output current

nLine regulation typically 0.01%/V

nLoad regulation typically 0.1%

nCurrent limit constant with temperature

nEliminates the need to stock many voltages

n80 dB ripple rejection

nOutput is short-circuit protected

Ordering Information

NS Part Number JAN Part Number NS Package Number Package Description

LM117HVH/883 H03A 3LD T0–39 Metal Can

LM117HVK/883 K02C 2LD T0–3 Low Profile Metal Can

March 2006

LM117HVQML 3-Terminal Adjustable Regulator

Connection Diagrams (See Physical Dimension section for further information)

(TO-3)

Metal Can Package

(TO-39)

Metal Can Package

20143829

Case is Output

Bottom View

See NS Package Number K02C

20143830

Case is Output

Bottom View

See NS Package Number H03A

Schematic Diagram

20143808

LM117HVQML

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Absolute Maximum Ratings (Note 1)

Power Dissipation (Note 2) Internally limited

Input - Output Voltage Differential +60V, −0.3V

Maximum Junction Temperature +150˚C

Storage Temperature −65˚C ≤T

≤+150˚C

Lead Temperature (Soldering, 10 sec.) 300˚C

Thermal Resistance

T0-3 Metal Can - Still Air 39˚C/W

T0-3 Metal Can - 500LF/Min Air flow 14˚C/W

T0-39 Metal Can - Still Air 186˚C/W

T0-39 Metal Can - 500LF/Min Air flow 64˚C/W

T0-3 Metal Can 1.9˚C/W

T0-39 Metal Can 21˚C/W

ESD Tolerance (Note 3) 2000V

Recommended Operating Conditions

Operating Temperature Range −55˚C ≤T

≤+125˚C

Quality Conformance Inspection

Mil-Std-883, Method 5005 − Group A

Subgroup Description Temp ˚C

1 Static tests at 25

2 Static tests at 125

3 Static tests at -55

4 Dynamic tests at 25

5 Dynamic tests at 125

6 Dynamic tests at -55

7 Functional tests at 25

8A Functional tests at 125

8B Functional tests at -55

9 Switching tests at 25

10 Switching tests at 125

11 Switching tests at -55

12 Settling time at 25

13 Settling time at 125

14 Settling time at -55

LM117HVQML

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LM117HVH/883 Electrical Characteristics

DC Parameters

The following conditions apply, unless otherwise specified.

DC: V

Diff

=(V

−V

), I

= 8mA, V

OUT

= 1.25v (Nominal)

Symbol Parameter Conditions Notes Min Max Unit

Sub-

groups

Adj

Adjustment Pin Current

Diff

= 3V 100 µA 1

Diff

= 3.3V 100 µA 2, 3

Diff

= 40V 100 µA 1, 2, 3

Minimum Load Current V

Diff

= 3V, V

= 1.7V 5.0 mA 1

Diff

= 3.3V, V

= 1.7V 5.0 mA 2, 3

= 40V, V

= 1.7V 5.0 mA 1, 2, 3

= 60V, V

= 1.7V 8.2 mA 1

Ref

Reference Voltage V

Diff

= 3V 1.2 1.3 V 1

Diff

= 3.3V 1.2 1.3 V 2, 3

Diff

= 40V 1.2 1.3 V 1, 2, 3

RLine

Line Regulation 3V ≤V

Diff

≤40V,

Ref

-8.64 8.64 mV 1

3.3V ≤V

Diff

≤40V,

Ref

-18 18 mV 2, 3

40V ≤V

Diff

≤60V,

= 60mA

-25 25 mV 1

RLoad

Load Regulation V

Diff

= 3V,

= 10mA to 500mA

-15 15 mV 1

Diff

= 3.3V,

= 10mA to 500mA

-15 15 mV 2, 3

Diff

= 40V,

= 10mA to 150mA

-15 15 mV 1

Diff

= 40V,

= 10mA to 100mA

-15 15 mV 2, 3

Delta I

Adj

Load

Adjustment Pin Current Change V

Diff

= 3V,

= 10mA to 500mA

-5.0 5.0 µA 1

Diff

= 3.3V,

= 10mA to 500mA

-5.0 5.0 µA 2, 3

Diff

= 40V,

= 10mA to 150mA

-5.0 5.0 µA 1

Diff

= 40V,

= 10mA to 100mA

-5.0 5.0 µA 2, 3

Delta I

Adj

Line

Adjustment Pin Current Change 3V ≤V

Diff

≤40V -5.0 5.0 µA 1

3.3V ≤V

Diff

≤40V -5.0 5.0 µA 2, 3

Short Circuit Current V

Diff

= 60V 0.0 0.4 A 1

Diff

= 4.25V 0.5 1.8 A 1

Thermal Regulation V

Diff

= 40V, I

= 150mA,

t = 20mS

6.0 mV 1

LM117HVQML

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LM117HVH/883 Electrical Characteristics (Continued)

AC Parameters

The following conditions apply, unless otherwise specified.

AC: V

Diff

=(V

−V

), I

= 8mA, V

OUT

= 1.25V (Nominal)

Symbol Parameter Conditions Notes Min Max Unit Sub-

groups

RR Ripple Rejection V

= +6.25V, ƒ = 120Hz,

=1V

RMS

= 125mA,

Ref

(Note 4) 66 dB 4, 5, 6

LM117HVQML

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LM117HVK/883 Electrical Characteristics

DC Parameters

The following conditions apply, unless otherwise specified.

DC: V

Diff

=(V

−V

), I

= 10mA, V

OUT

= 1.25V (Nominal)

Symbol Parameter Conditions Notes Min Max Unit

Sub-

groups

Adj

Adjustment Pin Current

Diff

= 3V 100 µA 1

Diff

= 3.3V 100 µA 2, 3

Diff

= 40V 100 µA 1, 2, 3

Minimum Load Current V

Diff

= 3V, V

= 1.7V 5.0 mA 1

Diff

= 3.3V, V

= 1.7V 5.0 mA 2, 3

= 40V, V

= 1.7V 5.0 mA 1, 2, 3

= 60V, V

= 1.7V 0.25 8.2 mA 1

Ref

Reference Voltage V

Diff

= 3V 1.2 1.3 V 1

Diff

= 3.3V 1.2 1.3 V 2, 3

Diff

= 40V 1.2 1.3 V 1, 2, 3

RLine

Line Regulation 3V ≤V

Diff

≤40V,

Ref

-8.64 8.64 mV 1

3.3V ≤V

Diff

≤40V,

Ref

-18 18 mV 2, 3

40V ≤V

Diff

≤60V,

= 60mA

-25 25 mV 1

RLoad

Load Regulation V

Diff

= 3V,

= 10mA to 1.5A

-15 15 mV 1

Diff

= 3.3V,

= 10mA to 1.5A

-15 15 mV 2, 3

Diff

= 40V,

= 10mA to 300mA

-15 15 mV 1

Diff

= 40V,

= 10mA to 195mA

-15 15 mV 2, 3

Delta I

Adj

Load

Adjustment Pin Current Change V

Diff

= 3V,

= 10mA to 1.5A

-5.0 5.0 µA 1

Diff

= 3.3V,

= 10mA to 1.5A

-5.0 5.0 µA 2, 3

Diff

= 40V,

= 10mA to 300mA

-5.0 5.0 µA 1

Diff

= 40V,

= 10mA to 195mA

-5.0 5.0 µA 2, 3

Delta I

Adj

Line

Adjustment Pin Current Change 3V ≤V

Diff

≤40V -5.0 5.0 µA 1

3.3V ≤V

Diff

≤40V -5.0 5.0 µA 2, 3

Short Circuit Current V

Diff

= 60V 0.0 0.4 A 1

Diff

= 3V 1.5 3.5 A 1

Thermal Regulation V

Diff

= 40V, I

= 300mA,

t = 20mS

10.5 mV 1

LM117HVQML

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LM117HVK/883 Electrical Characteristics (Continued)

AC Parameters

The following conditions apply, unless otherwise specified.

AC: V

Diff

=(V

−V

), I

= 10mA.

Symbol Parameter Conditions Notes Min Max Unit Sub-

groups

RR Ripple Rejection V

= +6.25V, ƒ = 120Hz,

=1V

RMS

= 0.5A,

Ref

(Note 4) 66 dB 4, 5, 6

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed

specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction

to ambient thermal resistance), and TA(ambient temperature). The maximum allowable power dissipation at any temperature is PDmax =(T

Jmax -T

A)/θJA or the

number given in the Absolute Maximum Ratings, whichever is lower. "Although power dissipation is internally limited, these specifications are applicable for power

dissipations of 2W for the TO39 package and 20W for the TO3 package."

Note 3: Human body model, 1.5 kΩin series with 100 pF.

Note 4: Tested at +25˚C; guaranteed but not tested at +125˚C and −55˚C

LM117HVQML

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Typical Performance Characteristics

Output capacitor=0µFunless otherwise noted.

Load Regulation Current Limit

20143832 20143833

Adjustment Current Dropout Voltage

20143834 20143835

Temperature Stability Minimum Operating Current

20143836 20143837

LM117HVQML

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Typical Performance Characteristics Output capacitor=0µFunless otherwise noted. (Continued)

Ripple Rejection Ripple Rejection

20143838 20143839

Ripple Rejection Output Impedance

20143840 20143841

Line Transient Response Load Transient Response

20143842 20143843

LM117HVQML

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Application Hints

In operation, the LM117HV develops a nominal 1.25V refer-

ence voltage, V

REF

, between the output and adjustment

terminal. The reference voltage is impressed across pro-

gram resistor R1 and, since the voltage is constant, a con-

stant current I

then flows through the output set resistor R2,

giving an output voltage of

Since the 100 µA current from the adjustment terminal rep-

resents an error term, the LM117HV was designed to mini-

mize I

ADJ

and make it very constant with line and load

changes. To do this, all quiescent operating current is re-

turned to the output establishing a minimum load current

requirement. If there is insufficient load on the output, the

output will rise.

EXTERNAL CAPACITORS

An input bypass capacitor is recommended. A 0.1 µF disc or

1 µF solid tantalum on the input is suitable input bypassing

for almost all applications. The device is more sensitive to

the absence of input bypassing when adjustment or output

capacitors are used but the above values will eliminate the

possibility of problems.

The adjustment terminal can be bypassed to ground on the

LM117HV to improve ripple rejection. This bypass capacitor

prevents ripple from being amplified as the output voltage is

increased. With a 10 µF bypass capacitor 80 dB ripple

rejection is obtainable at any output level. Increases over 10

µF do not appreciably improve the ripple rejection at fre-

quencies above 120 Hz. If the bypass capacitor is used, it is

sometimes necessary to include protection diodes to prevent

the capacitor from discharging through internal low current

paths and damaging the device.

In general, the best type of capacitors to use are solid

tantalum. Solid tantalum capacitors have low impedance

even at high frequencies. Depending upon capacitor con-

struction, it takes about 25 µF in aluminum electrolytic to

equal 1 µF solid tantalum at high frequencies. Ceramic

capacitors are also good at high frequencies; but some types

have a large decrease in capacitance at frequencies around

0.5 MHz. For this reason, 0.01 µF disc may seem to work

better than a 0.1 µF disc as a bypass.

Although the LM117HV is stable with no output capacitors,

like any feedback circuit, certain values of external capaci-

tance can cause excessive ringing. This occurs with values

between 500 pF and 5000 pF. A 1 µF solid tantalum (or 25 µF

aluminum electrolytic) on the output swamps this effect and

insures stability. Any increase of load capacitance larger

than 10 µF will merely improve the loop stability and output

impedance.

LOAD REGULATION

The LM117HV is capable of providing extremely good load

regulation but a few precautions are needed to obtain maxi-

mum performance. The current set resistor connected be-

tween the adjustment terminal and the output terminal (usu-

ally 240Ω) should be tied directly to the output of the

regulator rather than near the load. This eliminates line

drops from appearing effectively in series with the reference

and degrading regulation. For example, a 15V regulator with

0.05Ωresistance between the regulator and load will have a

load regulation due to line resistance of 0.05ΩxI

. If the set

resistor is connected near the load the effective line resis-

tance will be 0.05Ω(1 + R2/R1) or in this case, 11.5 times

worse.

Figure 2 shows the effect of resistance between the regula-

tor and 240Ωset resistor.

With the TO-3 package, it is easy to minimize the resistance

from the case to the set resistor, by using two separate leads

to the case. However, with the TO-5 package, care should be

taken to minimize the wire length of the output lead. The

ground of R2 can be returned near the ground of the load to

provide remote ground sensing and improve load regulation.

PROTECTION DIODES

When external capacitors are used with any IC regulator it is

sometimes necessary to add protection diodes to prevent

the capacitors from discharging through low current points

into the regulator. Most 10 µF capacitors have low enough

internal series resistance to deliver 20A spikes when

shorted. Although the surge is short, there is enough energy

to damage parts of the IC.

When an output capacitor is connected to a regulator and

the input is shorted, the output capacitor will discharge into

the output of the regulator. The discharge current depends

on the value of the capacitor, the output voltage of the

regulator, and the rate of decrease of V

. In the LM117HV,

this discharge path is through a large junction that is able to

sustain 15A surge with no problem. This is not true of other

types of positive regulators. For output capacitors of 25 µF or

less, there is no need to use diodes.

20143805

FIGURE 1.

20143806

FIGURE 2. Regulator with Line

Resistance in Output Lead

LM117HVQML

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Application Hints (Continued)

The bypass capacitor on the adjustment terminal can dis-

charge through a low current junction. Discharge occurs

when either the input or output is shorted. Internal to the

LM117HV is a 50Ωresistor which limits the peak discharge

current. No protection is needed for output voltages of 25V

or less and 10 µF capacitance. Figure 3 shows an LM117HV

with protection diodes included for use with outputs greater

than 25V and high values of output capacitance.

CURRENT LIMIT

Internal current limit will be activated whenever the output

current exceeds the limit indicated in the Typical Perfor-

mance Characteristics. However, if during a short circuit

condition the regulator’s differential voltage exceeds the Ab-

solute Maximum Rating of 60V (e.g. V

≥60V, V

OUT

= 0V),

internal junctions in the regulator may break down and the

device may be damaged or fail. Failure modes range from an

apparent open or short from input to output of the regulator,

to a destroyed package (most common with the TO-220

package). To protect the regulator, the user is advised to be

aware of voltages that may be applied to the regulator during

fault conditions, and to avoid violating the Absolute Maxi-

mum Ratings.

Note: D1 protects against C1

D2 protects against C2

Typical Applications

1.2V-45V Adjustable Regulator

20143801

Full output current not available at high input-output voltages

†Optional — improves transient response. Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum electrolytic

are commonly used to provide improved output impedance and rejection of transients.

*Needed if device is more than 6 inches from filter capacitors.

20143807

FIGURE 3. Regulator with Protection Diodes

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Typical Applications (Continued)

Digitally Selected Outputs

5V Logic Regulator with

Electronic Shutdown*

20143802

*Sets maximum VOUT

20143803

*Min. output ≈1.2V

Slow Turn-On 15V Regulator

Adjustable Regulator with Improved

Ripple Rejection

20143809

20143810

†Solid tantalum

*Discharges C1 if output is shorted to ground

High Stability 10V Regulator High Current Adjustable Regulator

20143811

20143812

†Solid tantalum

*Minimum load current = 30 mA

‡Optional — improves ripple rejection

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Typical Applications (Continued)

0 to 30V Regulator Power Follower

20143813

Full output current not available at high input-output voltages 20143814

5A Constant Voltage/Constant Current Regulator

20143815

†Solid tantalum

*Lights in constant current mode

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Typical Applications (Continued)

1A Current Regulator

1.2V–20V Regulator with

Minimum Program Current

20143816 20143817

*Minimum load current ≈4mA

High Gain Amplifier

20143818

Low Cost 3A Switching Regulator

20143819

†Solid tantalum

*Core — Arnold A-254168-2 60 turns

LM117HVQML

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Typical Applications (Continued)

4A Switching Regulator with Overload Protection

20143820

†Solid tantalum

*Core — Arnold A-254168-2 60 turns

Precision Current Limiter

20143821

* 0.8Ω≤R1 ≤120Ω

Tracking Preregulator

20143822

LM117HVQML

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Typical Applications (Continued)

Adjustable Multiple On-Card Regulators

with Single Control*

20143823

*All outputs within ±100 mV

†Minimum load — 10 mA

AC Voltage Regulator 12V Battery Charger

20143824

20143825

Use of RSallows low charging rates with fully charged battery.

**The 1000 µF is recommended to filter out input transients

50 mA Constant Current Battery Charger

20143826

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Typical Applications (Continued)

Adjustable 4A Regulator Current Limited 6V Charger

20143827

20143828

*Sets peak current (0.6A for 1Ω)

**The 1000 µF is recommended to filter out input transients

LM117HVQML

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Revision History

Date

Released

Revision Section Originator Changes

03/14/06 A New Release, Corporate format L. Lytle 2 MDS datasheets converted into one

Corporate datasheet format. Corrected I

from 60mA to 8mA for R

Line

. Separated

Delta I

Adj

/ Line from Delta I

Adj

/ Load for

both theH&Kdevices. Removed drift from

MNLM117HV-H electrical characteristics

since not performed on 883 product.

MNLM117HV-K Rev 0C1 & MNLM117HV-H

Rev 2A1 will be archived.

LM117HVQML

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Physical Dimensions inches (millimeters) unless otherwise noted

T0-39 Metal Can Package (H)

NS Package Number H03A

T0-3 Metal Can Package (K)

NS Package Number K02C

LM117HVQML

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Notes

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves

the right at any time without notice to change said circuitry and specifications.

For the most current product information visit us at www.national.com.

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which, (a) are intended for surgical implant into the body, or

(b) support or sustain life, and whose failure to perform when

properly used in accordance with instructions for use

provided in the labeling, can be reasonably expected to result

in a significant injury to the user.

2. A critical component is any component of a life support

device or system whose failure to perform can be reasonably

expected to cause the failure of the life support device or

system, or to affect its safety or effectiveness.

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LM117HVQML 3-Terminal Adjustable Regulator