SNOS491 Data sheet

SNOS491E February 2000 – March 2025 LM4051-N

PRODUCTION DATA

5.6 LM4051-ADJ Electrical Characteristics

over operating free-air temperature range (unless otherwise noted)

PARAMETER		TEST CONDITIONS			TYP	MAX	UNIT
V_REF	Reference Voltage	I_R = 100μA, V_OUT = 5V			1.212		V
	Reference Voltage Tolerance⁽²⁾⁽⁴⁾	I_R = 100μA, V_OUT =5V	LM4051AIM3⁽¹⁾			±1.2	mV
			LM4051BIM3⁽¹⁾			±2.4
			LM4051CIM3⁽¹⁾			±6
		Industrial Temp. Range T_A = T_J = T_MIN to T_MAX	LM4051AIM3⁽¹⁾			±5.2
			LM4051BIM3⁽¹⁾			±6.4
			LM4051CIM3⁽¹⁾			±10.1
I_RMIN	Minimum Operating Current	LM4051AIM3⁽¹⁾			36		µA
		LM4051BIM3⁽¹⁾			36
		LM4051CIM3⁽¹⁾			36
		Industrial Temp. Range T_A = T_J = T_MIN to T_MAX	LM4051AIM3⁽¹⁾			60
			LM4051BIM3⁽¹⁾			60
			LM4051CIM3 ⁽¹⁾			65
∆V_REF/∆I_R	Reference Voltage Change with Operating Current Change	I_RMIN ≤ I_R ≤ 1mA V_OUT ≥ 1.6V⁽³⁾	T_J = 25°C		0.3		mV
		I_RMIN ≤ I_R ≤ 1mA V_OUT ≥ 1.6V⁽³⁾	Industrial Temp. Range T_A = T_J = T_MIN to T_MAX			1.1⁽²⁾	mV
		1mA ≤ I_R ≤ 12mA V_OUT ≥ 1.6V⁽³⁾	T_J = 25°C		0.6
		1mA ≤ I_R ≤ 12mA V_OUT ≥ 1.6V⁽³⁾	Industrial Temp. Range T_A = T_J = T_MIN to T_MAX			6⁽²⁾
∆V_REF/∆V_O	Reference Voltage Change with Output Voltage Change	I_R = 0.1mA	T_J = 25°C		–1.69		mV
∆V_REF/∆V_O	Reference Voltage Change with Output Voltage Change	I_R = 0.1mA	Industrial Temp. Range T_A = T_J = T_MIN to T_MAX			–2.8⁽²⁾	mV
I_FB	Feedback Current				70	130	nA
∆V_REF/∆T	Average Reference Voltage Temperature Coefficient (Note 8)	V_OUT = 2.5V ∆T = −40 ̊C to +125 ̊C	I_R = 10mA	T_J = 25°C	20		ppm/°C
			I_R = 10mA	Industrial Temp. Range T_A = T_J = T_MIN to T_MAX		±50⁽²⁾
			I_R = 1mA	T_J = 25°C	15
			I_R = 1mA	Industrial Temp. Range T_A = T_J = T_MIN to T_MAX		±50⁽²⁾
			I_R =100μA	T_J = 25°C	15
			I_R =100μA	Industrial Temp. Range T_A = T_J = T_MIN to T_MAX		±50⁽²⁾
Z_OUT	Dynamic Output Impedance	I_R = 1mA, f = 120Hz, I_AC = 0.1 I_R	V_OUT = V_REF		0.3		Ω
Z_OUT	Dynamic Output Impedance	I_R = 1mA, f = 120Hz, I_AC = 0.1 I_R	V_OUT = 10V		2		Ω
e_N	Wide band Noise	I_R = 100μA, V_OUT = V_REF, 10Hz ≤ f ≤ 10kHz			20		µVrms
∆V_REF	Reference Voltage Long Term Stability⁽⁵⁾	t = 1000 hrs, I_R = 100μA, T = 25 ̊C ± 0.1 ̊C			120		ppm
V_HYST	Thermal Hysteresis⁽⁶⁾	∆T = −40 ̊C to +125 ̊C			0.3		mV/V

(1) Limits are 100% production tested at 25 ̊C. Limits over temperature are made sure through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National’s AOQL.

(2) This over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance ± [(∆V_R/∆T)(max∆T)(V_R)]. Where, ∆V_R/∆T is the V_R temperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25°̊C to T_MAX or T_MIN, and V_R is the reverse breakdown voltage. The total over temperature tolerance for the different grades in the industrial temperature range where max∆T = 65°C is shown below:

A-grade: ± 0.425% = ± 0.1% ± 50ppm/°̊C × 65°̊C
B-grade: ± 0.525% = ± 0.2% ± 50ppm/°̊C × 65°̊C
C-grade: ± 0.825% = ± 0.5% ± 50ppm/°̊C × 65°̊C

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

(3) When V_OUT ≤ 1.6V, the LM4051-ADJ in the SOT-23 package must operate at reduced I_R. 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 Section 5.7 section.

(4) Reference voltage and temperature coefficient change with output voltage. See Section 5.7 curves.

(5) Long-term stability is V_R at 25°̊C measured during 1000 hrs.

(6) Thermal hysteresis is defined as the difference in voltage measured at +25 ̊C after cycling to temperature –40 ̊C and the 25 ̊C measurement after cycling to temperature +125 ̊C.