NSC LM4051AIM3X-ADJ, LM4051AIM3-ADJ, LM4051AIM3-1.2, LM4051CIM3X-ADJ, LM4051CIM3X-1.2 Datasheet

February 2000

LM4051

Precision Micropower Shunt Voltage Reference

General Description

Ideal for space critical applications, the LM4051 precision voltage reference is available in the sub-miniature (3 mm x 1.3 mm) SSOT-23 surface-mount package. The LM4051's advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, thus making the LM4051 easy to use. Further reducing design effort is the availability of a fixed (1.225V) and adjustable reverse breakdown voltage. The minimum operating current is 60 µA for the LM4051-1.2 and the LM4051-ADJ. Both versions have a maximum operating current of 12 mA.

The LM4051 comes in three grades (A, B, and C). The best grade devices (A) have an initial accuracy of 0.1%, while the B-grade have 0.2% and the C-grade 0.5%, all with a tempco of 50 ppm/ÊC guaranteed from −40ÊC to 125ÊC.

The LM4051 utilizes fuse and zener-zap trim of reference voltage during wafer sort to ensure that the prime parts have an accuracy of better than ±0.1% (A grade) at 25ÊC.

Features

nSmall packages: SSOT-23

nNo output capacitor required

nTolerates capacitive loads

nReverse breakdown voltage options of 1.225V and adjustable

Key Specifications (LM4051-1.2)

n Output voltage tolerance
(A grade, 25ÊC)	±0.1%(max)
n Low output noise
(10 Hz to 10kHz)	20µVrms
n Wide operating current range	60µA to 12mA
n Industrial temperature range	−40ÊC to +85ÊC
(tempco guaranteed from
−40ÊC to +125ÊC)
n Low temperature coefficient	50 ppm/ÊC (max)

Applications

nPortable, Battery-Powered Equipment

nData Acquisition Systems

nInstrumentation

nProcess Control

nEnergy Management

nAutomotive and Industrial

nPrecision Audio Components

nBase Stations

nBattery Chargers

nMedical Equipment

nCommunication

Connection Diagrams

SSOT-23

DS101222-40

DS101222-1

*This pin must be left floating or connected to pin 2.

Top View

See NS Package Number MF03A

Reference Voltage Shunt Micropower Precision LM4051

© 2000 National Semiconductor Corporation

DS101222

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LM4051

Ordering Information

Reverse Breakdown	LM4051 Supplied as	LM4051 Supplied as	Part Marking
Voltage Tolerance at 25ÊC and	1000 Units, Tape and	3000 Units, Tape and
Average Reverse Breakdown	Reel	Reel
Voltage Temperature Coefficient
±0.1%, 50 ppm/ÊC max (A grade)	LM4051AIM3-1.2	LM4051AIM3X-1.2	RIA
	LM4051AIM3-ADJ	LM4051AIM3X-ADJ	RHA
±0.2%, 50 ppm/ÊC max (B grade)	LM4051BIM3-1.2	LM4051BIM3X-1.2	RIB
	LM4051BIM3-ADJ	LM4051BIM3X-ADJ	RHB
±0.5%, 50 ppm/ÊC max (C grade)	LM4051CIM3-1.2	LM4051CIM3X-1.2	RIC
	LM4051CIM3-ADJ	LM4051CIM3X-ADJ	RHC

SOT-23 Package Marking Information

Only three fields of marking are possible on the SSOT-23's small surface. This table gives the meaning of the three fields.

Field Definition

First Field:

R = Reference

Second Field:

I = 1.225V Voltage Option

H = Adjustable

Third Field:

A±C = Initial Reverse Breakdown

Voltage or Reference Voltage Tolerance

A = ±0.1%, B = ±0.2%, C = ±0.5%

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Reverse Current	20 mA
Forward Current	10 mA
Maximum Output Voltage
(LM4051-ADJ)	15V
Power Dissipation (TA = 25ÊC) (Note 2)
M3 Package	280 mW
Storage Temperature	−65ÊC to +150ÊC
Lead Temperature
M3 Packages
Vapor phase (60 seconds)	+215ÊC
Infrared (15 seconds)	+220ÊC

ESD Susceptibility
Human Body Model (Note 3)	2 kV
Machine Model (Note 3)	200V

See AN-450 ªSurface Mounting Methods and Their Effect on Product Reliabilityº for other methods of soldering surface mount devices.

Operating Ratings(Notes 1, 2)

Temperature Range	(Tmin ≤ TA ≤ Tmax)
Industrial Temperature Range	−40ÊC ≤ TA ≤ +85ÊC
Reverse Current
LM4051-1.2	60 µA to 12 mA
LM4051-ADJ	60 µA to 12 mA
Output Voltage Range
LM4051-ADJ	1.24V to 10V

LM4051-1.2

Electrical Characteristics

Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TA = TJ = 25ÊC. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of ±0.1%, ±0.2% and ±0.5% respectively.

Symbol		Parameter	Conditions	Typical	LM4051AIM3	LM4051BIM3	LM4051CIM3	Units
				(Note 4)	(Limits)	(Limits)	Limts	(Limit)
					(Note 5)	(Note 5)	(Note 5)
VR		Reverse Breakdown	IR = 100 µA	1.225				V
		Voltage
		Reverse Breakdown	IR = 100 µA		±1.2	±2.4	±6	mV (max)
		Voltage
		Tolerance (Note 6)			± 5.2	± 6.4	± 10.1	mV (max)
IRMIN		Minimum Operating		39				µA
		Current			60	60	60	µA (max)
					65	65	65	µA (max)
VR/	T	Average Reverse	IR= 10 mA	±20				ppm/ÊC
		Breakdown	IR = 1 mA	±15				ppm/ÊC
		Voltage Temperature	IR = 100 µA	±15	± 50	± 50	± 50	ppm/ÊC
		Coefficient (Note 6)
			T = −40ÊC to 125ÊC					(max)
VR/	IR	Reverse Breakdown	IRMIN ≤ IR ≤ 1 mA	0.3				mV
		Voltage			1.1	1.1	1.1	mV (max)
		Change with Operating			1.5	1.5	1.5	mV (max)
		Current Change
			1 mA ≤ IR ≤ 12 mA	1.8				mV
					6.0	6.0	6.0	mV (max)
					8.0	8.0	8.0	mV (max)
ZR		Reverse Dynamic	IR = 1 mA, f = 120 Hz	0.5				Ω
		Impedance
eN		Wideband Noise	IR = 100 µA	20				µV rms
			10 Hz ≤ f ≤ 10 kHz
VR		Reverse Breakdown	t = 1000 hrs
		Voltage	T = 25ÊC ±0.1ÊC	120				ppm
		Long Term Stability	IR = 100 µA
		(Note 9)
VHYST		Output Hysteresis	T = −40ÊC to 125ÊC	0.36				mV/V
		(Note 10)

LM4051

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LM4051

LM4051-ADJ (Adjustable)

Electrical Characteristics

Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TJ = 25ÊC unless otherwise specified (SSOT-23, see (Note 7)

,IRMIN £ IR £ 12 mA, VREF £ VOUT £ 10V. The grades A, B and C designate initial Reference Voltage Tolerances of ±0.1%,

±0.2% and ±0.5%, respectively for VOUT = 5V.

	Symbol	Parameter	Conditions	Typical	LM4051AIM3	LM4051BIM3	LM4051CIM3	Units
				(Note 4)	(Note 5)	(Note 5)	(Note 5)	(Limit)
	VREF	Reference Voltage	IR = 100 µA, VOUT = 5V	1.212				V
		Reference Voltage	IR = 100 µA, VOUT = 5V		±1.2	±2.4	±6	mV (max)
		Tolerance (Note 6),			± 5.2	± 6.4	± 10.1	mV (max)
		(Note 8)
	IRMIN	Minimum Operating		36				µA
		Current			60	60	65	µA (max)
					65	65	70	µA (max)
	DVREF/DIR	Reference	IRMIN £ IR £ 1mA	0.3				mV
		VoltageChange with	VOUT ³ 1.6V		1.1	1.1	1.1	mV (max)
		Operating Current	(Note 7)		1.5	1.5	1.5	mV(max)
		Change
			1 mA £ IR £ 12 mA	0.6				mV
			VOUT ³ 1.6V(Note 7)		6	6	6	mV (max)
					8	8	8	mV (max)
	DVREF/DVO	Reference Voltage	IR = 0.1 mA	−1.69				mV/V
		Changewith Output			−2.8	−2.8	−2.8	mV/V (max)
		Voltage Change			−3.5	−3.5	−3.5	mV/V (max)
	IFB	Feedback Current		70				nA
					130	130	130	nA (max)
					150	150	150	nA (max)
	DVREF/DT	Average	VOUT = 2.5V
		ReferenceVoltage	IR = 10mA	20				ppm/ÊC
		Temperature	IR = 1mA	15				ppm/ÊC
		Coefficient (Note 8)
			IR = 100µA	15	± 50	± 50	± 50	ppm/ÊC
								(max)
			DT = −40ÊC to +125ÊC
	ZOUT	Dynamic Output	IR = 1 mA,
		Impedance	f = 120 Hz,
			IAC = 0.1 IR
			VOUT = VREF	0.3				W
			VOUT = 10V	2				W
	eN	Wideband Noise	IR = 100 µA	20				µVrms
			VOUT = VREF
			10 Hz £ f £ 10 kHz
		Reference Voltage	t = 1000 hrs,	120				ppm
	DVREF	Long Term Stability	IR = 100 µA
		(Note 9)	T = 25ÊC ±0.1ÊC
	VHYST	Output Hysteresis	DT = −40ÊC to +125ÊC	0.3				mV/V
		(Note 10)

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Electrical Characteristics (continued)

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 (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax − T A)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4051, TJmax = 125ÊC, and the typical thermal resistance (θJA), when board mounted, is 280ÊC/W for the SSOT-23 package.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin.

Note 4: Typicals are at TJ = 25ÊC and represent most likely parametric norm.

Note 5: Limits are 100% production tested at 25ÊC. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National's AOQL.

Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance

±[( V R/ T)(max T)(VR)]. Where, VR/ T is the VR temperature coefficient, max T is the maximum difference in temperature from the reference point of 25 ÊC to T MAX or TMIN, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where max T=65ÊC is shown below:

A-grade: ±0.425% = ±0.1% ±50 ppm/ÊC x 65ÊC

B-grade: ±0.522% = ±0.2% ±50 ppm/ÊC x 65ÊC

C-grade: ±0.825% = ±0.5% ±50 ppm/ÊC x 65ÊC

Therefore, as an example, the A-grade LM4051-1.2 has an over-temperature Reverse Breakdown Voltage tolerance of ±1.2V x 0.425% = ±5.2 mV.

Note 7: When VOUT ≤ 1.6V, the LM4051-ADJ in the SSOT-23 package must operate at reduced IR. This is caused by the series resistance of the die attach between the die (-) output and the package (-) output pin. See the Output Saturation curve in the Typical Performance Characteristics section.

Note 8: Reference voltage and temperature coefficient will change with output voltage. See Typical Performance Characteristics curves.

Note 9: Long term stability is VR @ 25ÊC measured during 1000 hrs.

Note 10: Thermal hysteresis is defined as the changes in 25ÊC output voltage before and after cycling the device from −40ÊC or +125ÊC.

Typical Performance Characteristics

Temperature Drift for Different	Output Impedance vs Frequency
Average Temperature Coefficient

DS101222-19

DS101222-4

LM4051

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