SBOSAC6C June   2022  – September 2026 OPA4991-EP , OPA991-EP

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Input Protection Circuitry
      2. 6.3.2 EMI Rejection
      3. 6.3.3 Thermal Protection
      4. 6.3.4 Capacitive Load and Stability
      5. 6.3.5 Common-Mode Voltage Range
      6. 6.3.6 Phase Reversal Protection
      7. 6.3.7 Electrical Overstress
      8. 6.3.8 Overload Recovery
      9. 6.3.9 Typical Specifications and Distributions
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Slew Boost
    2. 7.2 Typical Applications
      1. 7.2.1 Low-Side Current Measurement
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 TINA-TI (Free Software Download)
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

5.5 Electrical Characteristics

For VS = (V+) – (V–) = 2.7V to 40V (±1.35V to ±20V) at TA = 25°C, RL = 10kΩ connected to VS / 2, VCM = VS / 2, and
VOUT = VS / 2, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OFFSET VOLTAGE
VOS Input offset voltage VCM = V– ±125 ±895 µV
TA = –55°C to 125°C ±925
dVOS/dT Input offset voltage drift TA = –55°C to 125°C ±0.3 µV/°C
PSRR Input offset voltage versus power supply VCM = V–, TA = –55°C to 125°C VS = 4V to 40V ±0.3 ±1 µV/V
VS = 2.7V to 40V(2) ±1 ±5
Channel separation f = 0Hz 5 µV/V
INPUT BIAS CURRENT
IB Input bias current ±10 pA
IOS Input offset current ±10 pA
NOISE
EN Input voltage noise f = 0.1Hz to 10Hz   1.8 µVPP
  0.3   µVRMS
eN Input voltage noise density f = 1kHz 10.8   nV/√Hz
f = 10kHz   9.4  
iN Input current noise f = 1kHz   82   fA/√Hz
INPUT VOLTAGE RANGE
VCM Common-mode voltage range (V–) – 0.1 (V+) + 0.1 V
CMRR Common-mode rejection ratio (V–) – 0.1V < VCM < (V+) – 2V (Main input pair), TA = –55°C to 125°C VS = 40V 107 130 dB
VS = 4V 82 100
VS = 2.7V(2) 75 95
VS = 2.7V to 40V, (V+) – 1V < VCM < (V+) + 0.1V (Aux input pair), TA = –55°C to 125°C 85
INPUT CAPACITANCE
ZID Differential 100 || 9 MΩ || pF
ZICM Common-mode 6 || 1 TΩ || pF
OPEN-LOOP GAIN
AOL Open-loop voltage gain VS = 40V, VCM = V–,
(V–) + 0.1V < VO < (V+) – 0.1V		 120 145 dB
TA = –55°C to 125°C 142
VS = 4V, VCM = V–,
(V–) + 0.1V < VO < (V+) – 0.1V		 104 130
TA = –55°C to 125°C 125
VS = 2.7V, VCM = V–,
(V–) + 0.1V < VO < (V+) – 0.1V(2)		 101 120
TA = –55°C to 125°C 118
FREQUENCY RESPONSE
GBW Gain-bandwidth product 4.5 MHz
SR Slew rate(3) VS = 40V, G = +1, CL = 20pF 20mV < VID < 150mV 0.5 V/µs
VID > 150mV 21
tS Settling time To 0.01%, VS = 40V, G = +1, CL = 20pF VSTEP = 10V 2.5 µs
VSTEP = 2V 1.5
To 0.1%, VS = 40V, G = +1, CL = 20pF VSTEP = 10V 2
VSTEP = 2V 1
Phase margin G = +1, RL = 10kΩ, CL = 20pF 60 °
Overload recovery time VIN  × gain > VS 400 ns
THD+N Total harmonic distortion + noise (1) VS = 40V, VO = 3VRMS, G = +1, f = 1kHz 0.00021 %
OUTPUT
  Voltage output swing from rail Positive and negative rail headroom VS = 40V, RL = no load(2)   5 10 mV
VS = 40V, RL = 10kΩ   50 70
VS = 40V, RL = 2kΩ   300 350
VS = 2.7V, RL = no load(2)   1 6
VS = 2.7V, RL = 10kΩ   5 12
VS = 2.7V, RL = 2kΩ   25 40
ISC Short-circuit current ±75 mA
CLOAD Capacitive load drive 1000 pF
ZO Open-loop output impedance f = 1MHz, IO = 0A 525 Ω
POWER SUPPLY
IQ Quiescent current per amplifier VCM = V–, IO = 0A OPA4991-EP 560 685 µA
OPA991-EP 560 691
VCM = V–, IO = 0A, TA = –55°C to 125°C OPA4991-EP 750
OPA991-EP 769
(1) Third-order filter; bandwidth = 80kHz at –3dB.
(2) Specified by characterization only.
(3) Refer to Slew Boost for detailed discussion.