LMV554MTX/NOPB - NATIONAL SEMICONDUCTOR

LMV551,LMV552,LMV554

LMV551/LMV552/LMV554 3 MHz, Micropower RRO Amplifiers

Literature Number: SNOSAQ5D

October 8, 2008

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 oper-

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

them a great choice for automotive applications, sensor ap-

plications 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

LMV551/LMV552/LMV554 3 MHz, Micropower RRO Amplifiers

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor 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

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

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LMV551/LMV552/LMV554

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

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

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

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LMV551/LMV552/LMV554

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

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.

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

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LMV551/LMV552/LMV554

Typical Performance Characteristics

Open Loop Gain and Phase with Capacitive Load

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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

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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

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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

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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

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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 guaran-

teed 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 process-

ing applications such as portable media players and instru-

mentation.

Low Input Referred Noise

The LMV551/LMV552/LMV554 provide a flatband input re-

ferred voltage noise density of 70 nV/ , which is signifi-

cantly 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 specifica-

tion 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 pack-

ages 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. Sta-

bilizing 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.

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 re-

spect 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.

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LMV551/LMV552/LMV554

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 pres-

ence 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)

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 com-

pensation is not viable. A simpler scheme for compensation

is shown in Figure 3. A resistor, RISO, is placed in series be-

tween the load capacitance and the output. This introduces a

zero in the circuit transfer function, which counteracts the ef-

fect of the pole formed by the load capacitance and ensures

stability. The value of RISO to be used should be decided de-

pending on the size of CL and the level of performance de-

sired. 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 appli-

cations. 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, Butter-

worth or Bessel). The Sallen-Key topology, in particular, can

be used to attain a wide range of Q, by using positive feed-

back 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 ap-

pear 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

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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

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LMV551/LMV552/LMV554

8-Pin MSOP

NS Package Number MUA08A

14-Pin TSSOP

NS Package Number MTC14

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LMV551/LMV552/LMV554

Notes

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LMV551/LMV552/LMV554

Notes

LMV551/LMV552/LMV554 3 MHz, Micropower RRO Amplifiers

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