LMV551MG - National Semiconductor

LMV551/LMV552/LMV554

3 MHz, Micropower RRO Amplifiers

General Description

The LMV551/LMV552/LMV554 are high performance, low

power operational amplifiers implemented with National’s ad-

vanced VIP50 process. They feature 3 MHz of bandwidth

while consuming only 37 μA of current per amplifier, which is

an exceptional bandwidth to power ratio in this op amp class.

These amplifiers are unity gain stable and provide an excel-

lent solution for low power applications requiring a wide band-

width.

The LMV551/LMV552/LMV554 have a rail-to-rail output stage

and an input common mode range that extends below ground.

The LMV551/LMV552/LMV554 have an operating supply

voltage range from 2.7V to 5.5V. These amplifiers can operate

over a wide temperature range (−40°C to 125°C) making them

a great choice for automotive applications, sensor applica-

tions as well as portable instrumentation applications. The

LMV551 is offered in the ultra tiny 5-Pin SC70 and 5-Pin

SOT-23 package. The LMV552 is offered in an 8-Pin MSOP

package. The LMV554 is offered in the 14-Pin TSSOP.

Features

(Typical 5V supply, unless otherwise noted.)

●Guaranteed 3V and 5.0V performance

●High unity gain bandwidth 3 MHz

●Supply current (per amplifier) 37 µA

●CMRR 93 dB

●PSRR 90 dB

●Slew rate 1 V/µs

●Output swing with 100 kΩ load 70 mV from rail

●Total harmonic distortion 0.003% @ 1 kHz, 2 kΩ

●Temperature range −40°C to 125°C

Applications

●Active filter

●Portable equipment

●Automotive

●Battery powered systems

●Sensors and Instrumentation

Typical Application

20152601

20152613

Open Loop Gain and Phase vs. Frequency

PRODUCTION DATA information is current as of

publication date. Products conform to specifications per

the terms of the Texas Instruments standard warranty.

Production processing does not necessarily include

testing of all parameters.

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for

availability and specifications.

ESD Tolerance (Note 2)

Human Body Model

LMV551/LMV552/LMV554 2 KV

Machine Model

LMV551 100V

LMV552/LMV554 250V

VIN Differential (@ V+ = 5V) ±2.5V

Supply Voltage (V+ - V−)6V

Voltage at Input/Output pins V+ +0.3V, V− −0.3V

Storage Temperature Range −65°C to 150°C

Junction Temperature (Note 3) 150°C

Soldering Information

Infrared or Convection (20 sec) 235°C

Wave Soldering Lead Temp. (10 sec) 260°C

Operating Ratings (Note 1)

Temperature Range (Note 3) −40°C to 125°C

Supply Voltage (V+ – V−)2.7V to 5.5V

Package Thermal Resistance (θJA (Note 3))

5-Pin SC70 456°C/W

5-Pin SOT-23 234°C/W

8-Pin MSOP 235°C/W

14-Pin TSSOP 160°C/W

3V Electrical Characteristics

Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 3V, V− = 0V, VCM = V+/2 = VO. Boldface limits apply at

the temperature extremes. (Note 4)

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

VOS Input Offset Voltage 1 3

4.5 mV

TC VOS Input Offset Average Drift 3.3 μV/°C

IBInput Bias Current (Note 7) 20 38 nA

IOS Input Offset Current 1 20 nA

CMRR Common Mode Rejection Ratio 0V ≤ VCM 2.0V 74

92 dB

PSRR Power Supply Rejection Ratio 3.0 ≤ V+ ≤ 5V,

VCM = 0.5V

LMV551/LMV552 80

78 92

LMV554 78

2.7 ≤ V+ ≤ 5.5V,

VCM = 0.5V

LMV551/LMV552 80

78 92

LMV554 78

CMVR Input Common-Mode Voltage

Range

CMRR ≥ 68 dB

CMRR ≥ 60 dB

2.1

2.1 V

LMV551/LMV552/LMV554

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

AVOL Large Signal Voltage Gain 0.4 ≤ VO ≤ 2.6,

RL = 100 kΩ to V+/2

LMV551/LMV552 81

78 90

LMV554 79

0.4 ≤ VO ≤ 2.6, RL = 10 kΩ to V+/2 71

VOOutput Swing High RL = 100 kΩ to V+/2 40 48

mV from

rail

RL = 10 kΩ to V+/2 85 100

120

Output Swing Low RL = 100 kΩ to V+/2 50 65

RL = 10 kΩ to V+/2 95 110

130

ISC Output Short Circuit Current Sourcing (Note 9) 10 mA

Sinking (Note 9) 25

ISSupply Current per Amplifier 34 42

52 μA

SR Slew Rate AV = +1,

10% to 90% (Note 8)

1 V/μs

ΦmPhase Margin RL = 10 kΩ, CL = 20 pF 75 Deg

GBW Gain Bandwidth Product 3 MHz

enInput-Referred Voltage Noise f = 100 kHz 70 nV/

f = 1 kHz 70

inInput-Referred Current Noise f = 100 kHz 0.1 pA/

f = 1 kHz 0.15

THD Total Harmonic Distortion f = 1 kHz, AV = 2, RL = 2 kΩ 0.003 %

5V Electrical Characteristics

Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V, VCM = V+/2 = VO. Boldface limits apply at

the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

VOS Input Offset Voltage 1 3.0

4.5 mV

TC VOS Input Offset Average Drift 3.3 μV/°C

IBInput Bias Current (Note 7) 20 38 nA

IOS Input Offset Current 1 20 nA

CMRR Common Mode Rejection Ratio 0 ≤ VCM ≤ 4.0V 76

93 dB

PSRR Power Supply Rejection Ratio 3V ≤ V+ ≤ 5V to VCM = 0.5V 78

2.7V ≤ V+ ≤ 5.5V to VCM = 0.5V 78

CMVR Input Common-Mode Voltage

Range

CMRR ≥ 68 dB

CMRR ≥ 60 dB

4.1

4.1 V

AVOL Large Signal Voltage Gain 0.4 ≤ VO ≤ 4.6, RL = 100 kΩ to V+/2 78

0.4 ≤ VO ≤ 4.6, RL = 10 kΩ to V+/2 75

LMV551/LMV552/LMV554

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

VOOutput Swing High RL = 100 kΩ to V+/2 70 92

122

mV from

rail

RL = 10 kΩ to V+/2 125 155

210

Output Swing Low RL = 100 kΩ to V+/2 60 70

RL = 10 kΩ to V+/2 110 130

155

ISC Output Short Circuit Current Sourcing (Note 9) 10 mA

Sinking (Note 9) 25

ISSupply Current Per Amplifier 37 46

54 μA

SR Slew Rate AV = +1, VO = 1 VPP

10% to 90% (Note 8)

1 V/μs

ΦmPhase Margin RL = 10 kΩ, CL = 20 pF 75 Deg

GBW Gain Bandwidth Product 3 MHz

enInput-Referred Voltage Noise f = 100 kHz 70 nV/

f = 1 kHz 70

inInput-Referred Current Noise f = 100 kHz 0.1 pA/

f = 1 kHz 0.15

THD Total Harmonic Distortion f = 1 kHz, AV = 2, RL = 2 kΩ 0.003 %

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

intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics

Tables.

Note 2: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)

Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).

Note 3: The maximum power dissipation is a function of TJ(MAX), θJA. The maximum allowable power dissipation at any ambient temperature is

PD = (TJ(MAX) - TA)/ θJA. All numbers apply for packages soldered directly onto a PC board.

Note 4: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating

of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ >

TA.

Note 5: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will

also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.

Note 6: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlations using statistical quality

control (SQC) method.

Note 7: Positive current corresponds to current flowing into the device.

Note 8: Slew rate is the average of the rising and falling slew rates.

Note 9: The part is not short circuit protected and is not recommended for operation with heavy resistive loads.

LMV551/LMV552/LMV554

Connection Diagrams

5-Pin SC70/ SOT-23

20152602

Top View

8-Pin MSOP

20152611

Top View

14-Pin TSSOP

20152610

Top View

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing

5-Pin SC70 LMV551MG A94 1k Units Tape and Reel MAA05A

LMV551MGX 3k Units Tape and Reel

5-Pin SOT-23 LMV551MF AF3A 1k Units Tape and Reel MF05A

LMV551MFX 3k Units Tape and Reel

8-Pin MSOP LMV552MM AH3A 1k Units Tape and Reel MUA08A

LMV552MMX 3.5k Units Tape and Reel

14-Pin TSSOP LMV554MT LMV554MT 94 Units/Rail MTC14

LMV554MTX 2.5k Units Tape and Reel

LMV551/LMV552/LMV554

Typical Performance Characteristics

Open Loop Gain and Phase with Capacitive Load

20152614

Open Loop Gain and Phase with Resistive Load

20152615

Open Loop Gain and Phase with Resistive Load

20152616

Open Loop Gain and Phase with Resistive Load

20152617

Open Loop Gain and Phase with Resistive Load

20152618

Slew Rate vs. Supply voltage

20152619

LMV551/LMV552/LMV554

Small Signal Transient Response

20152620

Large Signal Transient Response

20152621

Small Signal Transient Response

20152622

Input Referred Noise vs. Frequency

20152623

THD+N vs. Amplitude @ 3V

20152624

THD+N vs. Amplitude @ 5V

20152625

LMV551/LMV552/LMV554

THD+N vs. Amplitude

20152626

THD+N vs. Amplitude

20152627

Supply Current vs. Supply Voltage

20152628

VOS vs. VCM

20152629

VOS vs. VCM

20152630

VOS vs. Supply Voltage

20152631

LMV551/LMV552/LMV554

IBIAS vs. VCM

20152632

IBIAS vs. VCM

20152633

IBIAS vs. Supply Voltage

20152634

Positive Output Swing vs. Supply Voltage

20152635

Negative Output Swing vs. Supply Voltage

20152636

Positive Output Swing vs. Supply Voltage

20152637

LMV551/LMV552/LMV554

Negative Output Swing vs. Supply Voltage

20152638

Applications Information

ADVANTAGES OF THE LMV551/LMV552/LMV554

Low Voltage and Low Power Operation

The LMV551/LMV552/LMV554 have performance guaranteed at supply voltages of 3V and 5V and are guaranteed to be operational

at all supply voltages between 2.7V and 5.5V. For this supply voltage range, the LMV551/LMV552/LMV554 draw the extremely

low supply current of less than 37 μA per amp.

Wide Bandwidth

The bandwidth to power ratio of 3 MHz to 37 μA per amplifier is one of the best bandwidth to power ratios ever achieved. This

makes these devices ideal for low power signal processing applications such as portable media players and instrumentation.

Low Input Referred Noise

The LMV551/LMV552/LMV554 provide a flatband input referred voltage noise density of 70 nV/ , which is significantly better

than the noise performance expected from an ultra low power op amp. They also feature the exceptionally low 1/f noise corner

frequency of 4 Hz. This noise specification makes the LMV551/LMV552/LMV554 ideal for low power applications such as PDAs

and portable sensors.

Ground Sensing and Rail-to-Rail Output

The LMV551/LMV552/LMV554 each have a rail-to-rail output stage, which provides the maximum possible output dynamic range.

This is especially important for applications requiring a large output swing. The input common mode range includes the negative

supply rail which allows direct sensing at ground in a single supply operation.

Small Size

The small footprints of the LMV551/LMV552/LMV554 packages save space on printed circuit boards, and enable the design of

smaller and more compact electronic products. Long traces between the signal source and the op amp make the signal path

susceptible to noise. By using a physically smaller package, the amplifiers can be placed closer to the signal source, reducing noise

pickup and enhancing signal integrity

STABILITY OF OP AMP CIRCUITS

Stability and Capacitive Loading

As seen in the Phase Margin vs. Capacitive Load graph, the phase margin reduces significantly for CL greater than 100 pF. This

is because the op amp is designed to provide the maximum bandwidth possible for a low supply current. Stabilizing them for higher

capacitive loads would have required either a drastic increase in supply current, or a large internal compensation capacitance,

which would have reduced the bandwidth of the op amp. Hence, if the LMV551/LMV552/LMV554 are to be used for driving higher

capacitive loads, they will have to be externally compensated.

LMV551/LMV552/LMV554

20152603

FIGURE 1. Gain vs. Frequency for an Op Amp

An op amp, ideally, has a dominant pole close to DC, which causes its gain to decay at the rate of 20 dB/decade with respect to

frequency. If this rate of decay, also known as the rate of closure (ROC), remains the same until the op amp’s unity gain bandwidth,

the op amp is stable. If, however, a large capacitance is added to the output of the op amp, it combines with the output impedance

of the op amp to create another pole in its frequency response before its unity gain frequency (Figure 1). This increases the ROC

to 40 dB/ decade and causes instability.

In such a case a number of techniques can be used to restore stability to the circuit. The idea behind all these schemes is to modify

the frequency response such that it can be restored to an ROC of 20 dB/decade, which ensures stability.

In the Loop Compensation

Figure 2 illustrates a compensation technique, known as ‘in the loop’ compensation, that employs an RC feedback circuit within

the feedback loop to stabilize a non-inverting amplifier configuration. A small series resistance, RS, is used to isolate the amplifier

output from the load capacitance, CL, and a small capacitance, CF, is inserted across the feedback resistor to bypass CL at higher

frequencies.

20152604

FIGURE 2. In the Loop Compensation

The values for RS and CF are decided by ensuring that the zero attributed to CF lies at the same frequency as the pole attributed

to CL. This ensures that the effect of the second pole on the transfer function is compensated for by the presence of the zero, and

that the ROC is maintained at 20 dB/decade. For the circuit shown in Figure 2 the values of RS and CF are given by Equation 1.

Values of RS and CF required for maintaining stability for different values of CL, as well as the phase margins obtained, are shown

in Table 1. RF, RIN, and RL are to be 10 kΩ, while ROUT is 340Ω.

(1)

LMV551/LMV552/LMV554

TABLE 1.

CL (pF) RS (Ω) CF (pF) Phase Margin (°)

50 340 8 47

100 340 15 42

150 340 22 40

Although this methodology provides circuit stability for any load capacitance, it does so at the price of bandwidth. The closed loop

bandwidth of the circuit is now limited by RF and CF.

Compensation by External Resistor

In some applications it is essential to drive a capacitive load without sacrificing bandwidth. In such a case, in the loop compensation

is not viable. A simpler scheme for compensation is shown in Figure 3. A resistor, RISO, is placed in series between the load

capacitance and the output. This introduces a zero in the circuit transfer function, which counteracts the effect of the pole formed

by the load capacitance and ensures stability. The value of RISO to be used should be decided depending on the size of CL and

the level of performance desired. Values ranging from 5Ω to 50Ω are usually sufficient to ensure stability. A larger value of RISO

will result in a system with less ringing and overshoot, but will also limit the output swing and the short circuit current of the circuit.

20152612

FIGURE 3. Compensation by Isolation Resistor

Typical Application

ACTIVE FILTERS

With a wide unity gain bandwidth of 3 MHz, low input referred noise density and a low power supply current, the LMV551/LMV552/

LMV554 are well suited for low-power filtering applications. Active filter topologies, such as the Sallen-Key low pass filter shown in

Figure 4, are very versatile, and can be used to design a wide variety of filters (Chebyshev, Butterworth or Bessel). The Sallen-

Key topology, in particular, can be used to attain a wide range of Q, by using positive feedback to reject the undesired frequency

range.

In the circuit shown in Figure 4, the two capacitors appear as open circuits at lower frequencies and the signal is simply buffered

to the output. At high frequencies the capacitors appear as short circuits and the signal is shunted to ground by one of the capacitors

before it can be amplified. Near the cut-off frequency, where the impedance of the capacitances is on the same order as RG and

RF, positive feedback through the other capacitor allows the circuit to attain the desired Q.

20152609

FIGURE 4. Sallen-Key Filter

LMV551/LMV552/LMV554

Physical Dimensions inches (millimeters) unless otherwise noted

5-Pin SC70

NS Package Number MAA05A

5-Pin SOT-23

NS Package Number MF05A

LMV551/LMV552/LMV554

8-Pin MSOP

NS Package Number MUA08A

14-Pin TSSOP

NS Package Number MTC14

LMV551/LMV552/LMV554

Notes

LMV551/LMV552/LMV554

Notes

Incorporated

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