Datasheet

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OPA567

Rail-to-Rail I/O, 2A

POWER AMPLIFIER

DESCRIPTION

The OPA567 is a low-cost, high-current, operational amplifier

designed for driving a wide variety of loads while operating on

low-voltage supplies. It operates from either single or dual

supplies for design flexibility and has rail-to-rail swing on the

input and output. Output swing is within 300mV of the supply

rails, with output current of 2A. Smaller loads allow an output

swing closer to the rails.

The OPA567 is unity gain stable, easy to use, and free from

the phase inversion problems found in some power amplifi-

ers. High performance is maintained at voltage swings near

the output rails.

The OPA567 provides an accurate user-selected current

limit set with an external resistor, or digitally adjusted via a

Digital-to-Analog Converter (DAC).

The output of the OPA567 can be independently disabled

using the Enable pin. This feature saves power and protects

the load.

Two flags are provided. The current limit flag, I

FLAG

, warns of

current limit conditions. T

FLAG

is a thermal flag that warns of

thermal overstress. The T

FLAG

pin can be connected to the

Enable pin to provide a thermal shutdown solution.

The OPA567 is available in a tiny 5mm x 5mm Quad

Flatpack No-lead (QFN) package and features an exposed

thermal pad that enhances thermal and electrical character-

istics. It is small and easy to heat sink. The OPA567 is

specified for operation over the industrial temperature range,

–40°C to +85°C.

FEATURES

● HIGH OUTPUT CURRENT: 2A

● OUTPUT SWINGS TO: 150mV of Rails with I

= 2A

● THERMAL PROTECTION

● ADJUSTABLE CURRENT LIMIT

● TWO FLAGS: Current Limit and Temperature

Warning

● LOW SUPPLY VOLTAGE OPERATION: 2.7V to 5.5V

● SHUTDOWN FUNCTION WITH OUTPUT DISABLE

● SMALL POWER PACKAGE

APPLICATIONS

● THERMOELECTRIC COOLER DRIVER

● LASER DIODE PUMP DRIVER

● VALVE, ACTUATOR DRIVER

● SYNCHRO, SERVO DRIVER

● TRANSDUCER EXCITATION

● GENERAL LINEAR POWER BOOSTER FOR

OP AMPS

www.ti.com

SBOS287A – JUNE 2005 – REVISED SEPTEMBER 2005

OPA567

FLAG

V–

NOTE: (1) Connect

for thermal protection.

–IN

+IN

V+

1, 12

4, 5

2, 3

SET

(1)

Enable

SET

FLAG

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PowerPAD is a trademark of Texas Instruments. All other trademarks are the property of their respective owners.

OPA567 RELATED PRODUCTS

FEATURES PRODUCT

Same features as the OPA567, plus current OPA569

monitor output and paralleling ability in SO-20

PowerPAD™ package.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Summary of content (26 pages)

PAGE 1
OPA567 OP A56 7 SBOS287A – JUNE 2005 – REVISED SEPTEMBER 2005 Rail-to-Rail I/O, 2A POWER AMPLIFIER FEATURES DESCRIPTION ● ● ● ● ● HIGH OUTPUT CURRENT: 2A OUTPUT SWINGS TO: 150mV of Rails with IO = 2A THERMAL PROTECTION ADJUSTABLE CURRENT LIMIT TWO FLAGS: Current Limit and Temperature Warning The OPA567 is a low-cost, high-current, operational amplifier designed for driving a wide variety of loads while operating on low-voltage supplies.
PAGE 2
ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage ................................................................................. +7.5V Output Current ............................................................... See SOA Curves Signal Input Terminals (pins 8 and 9): Voltage(2) ............................................... (V–) – 0.5V to (V+) + 0.5V Current(2) ................................................................................ ±10mA Output Short-Circuit(3) ........
PAGE 3
ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. At TCASE = +25°C, RL = 1kΩ, and connected to VS /2, unless otherwise noted. OPA567 PARAMETER OFFSET VOLTAGE Input Offset Voltage vs Temperature vs Power Supply INPUT BIAS CURRENT Input Bias Current vs Temperature Input Offset Current NOISE Input Voltage Noise Density, f = 1kHz f = 0.
PAGE 4
ELECTRICAL CHARACTERISTICS: VS = +2.7V to +5.5V (Cont.) Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. At TCASE = +25°C, RL = 1kΩ, and connected to VS /2, unless otherwise noted. OPA567 PARAMETER CONDITION MIN THERMAL FLAG PIN (TFLAG) Junction Temperature: TJ Alarm (thermal status pin Low) Return to normal operation (Thermal Flag pin High) Thermal Flag Pin Voltage During normal operation During thermal overstress TFLAG pin sourcing 25µA TFLAG pin sinking 25µA (V+) – 0.
PAGE 5
TYPICAL CHARACTERISTICS At TA = +25°C, VS = +5V, unless otherwise noted. POWER-SUPPLY AND COMMON-MODE REJECTION RATIO vs FREQUENCY 0 160 –20 140 –40 120 –60 100 –80 80 –100 60 –120 40 –140 20 –160 0 –180 CMRR 100 0.
PAGE 6
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = +5V, unless otherwise noted. INPUT VOLTAGE NOISE SPECTRAL DENSITY vs FREQUENCY 0.1Hz TO 10Hz INPUT VOLTAGE NOISE Input Voltage Noise (nV√Hz) 1000 1µV/div 100 10 1 10 100 1k 10k 1s/div 100k Frequency (Hz) TOTAL HARMONIC DISTORTION+NOISE vs FREQUENCY MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 10 6 VS = 5V RL = 1kΩ 1 4 RL = 1Ω 3 RL = 1kΩ RL = 2Ω THD+N (%) Output Voltage (VPP) 5 0.1 RL = 8Ω 2 0.01 VS = 2.7V 1 RL = 1kΩ RL = 1Ω 0.
PAGE 7
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = +5V, unless otherwise noted. SHUTDOWN CURRENT vs TEMPERATURE 12 10 10 Shutdown Current (µA) Shutdown Current (µA) SHUTDOWN CURRENT vs SUPPLY VOLTAGE 12 8 ILIMIT = 200mA, 1A, and 2A 6 4 2 8 6 4 2 0 0 2.7 3.0 3.5 4.0 4.5 5.0 5.
PAGE 8
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = +5V, unless otherwise noted. VOLTAGE ON ISET PIN vs SUPPLY VOLTAGE VOLTAGE ON ISET PIN vs TEMPERATURE 1.25 1.20 Current Limit = 200mA 1.20 [VSET – (V–)] [VSET – (V–)] (V) 1.19 1.18 Current Limit = 1A 1.15 Current Limit = 2A 1.10 1.17 1.05 1.16 –55 –35 –15 5 25 45 65 85 105 2.7 125 3.0 3.5 4.0 4.5 5.0 5.
PAGE 9
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = +5V, unless otherwise noted. LARGE-SIGNAL STEP RESPONSE (G = +1, RL = 10Ω) 1V/div 50mV/div SMALL-SIGNAL STEP RESPONSE (G = +1, RL = 10Ω) 20µs/div SMALL-SIGNAL STEP RESPONSE (G = +1, RL = 1Ω) LARGE-SIGNAL STEP RESPONSE (G = +1, RL = 1Ω) 1V/div 50mV/div 10µs/div 20µs/div 20µs/div ENABLE (10Ω Load) ENABLE (1Ω Load) 2V/div 2V/div Enable/Disable 0.8 to 2.
PAGE 10
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = +5V, unless otherwise noted. DISABLE (1Ω Load) 2V/div 2V/div DISABLE (10Ω Load) Enable/Disable 0.8 to 2.5V Above Negative Supply Output Driven to +2V 1V/div 200ns/div POWER ON (1Ω Load) POWER OFF (1Ω Load) 5V/div 200ns/div Supply 5V to 0V 1V/div Supply 0V to 5V Output Driven to +2V Output Driven to +2V 1ms/div IN AND OUT OF CURRENT LIMIT TRANSIENT (RL = 0.75Ω, Current Limit = 2A) IN AND OUT OF CURRENT LIMIT TRANSIENT (RL = 7.
PAGE 11
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = +5V, unless otherwise noted. NO PHASE INVERSION WITH INPUTS LARGER THAN SUPPLY VOLTAGE (G = +1, RL = 10Ω) OVERLOAD RECOVERY (G = +1) 1V/div 1V/div VIN VOUT VOUT VIN 40µs/div 1ms/div CURRENT LIMIT ERROR vs TEMPERATURE CURRENT LIMIT ERROR vs SUPPLY VOLTAGE 15 15 10 Current Limit Error (%) Current Limit Error (%) 10 ILIMIT – 5 0 ILIMIT+ –5 5 0 ILIMIT+ –10 –10 –15 –15 2.7 3.0 3.5 4.0 4.5 5.0 –55 5.
PAGE 12
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = +5V, unless otherwise noted. CLOSED-LOOP OUTPUT IMPEDANCE vs FREQUENCY 100 Output Impedance (Ω) G=1 10 1 0.1 10k 12 100k Frequency (Hz) 1M 2M OPA567 www.ti.
PAGE 13
APPLICATIONS INFORMATION R1 R2 BASIC CONFIGURATION V+ Figure 1 shows the OPA567 connected as a basic noninverting amplifier. However, the OPA567 can be used in virtually any op amp configuration. A current limit setting resistor (RSET, in Figure 1) is essential to the OPA567 operation, and cannot be omitted. 47µF 0.1µF 1, 12 8 2, 3 Power-supply terminals should be bypassed with low series impedance capacitors. Using larger tantalum and smaller ceramic type capacitors in parallel is recommended.
PAGE 14
Current Limit Accuracy ENABLE PIN—OUTPUT DISABLE Internally separate circuits monitor the positive and negative current limits. Each circuit output is compared to a single internal reference that is set by the user with an external resistor or a resistor/voltage source combination. The OPA567 employs a patented circuit technique to achieve an accurate and stable current limit throughout the full output range.
PAGE 15
ENSURING MICROCONTROLLER COMPATIBILITY +V Not all microcontrollers output the same logic state after power-up or reset. 8051-type microcontrollers, for example, output logic High levels on their ports while other models power up with logic Low levels after reset. 1, 12 –In In configuration (a) shown in Figure 4, the enable/disable signal is applied on the cathode side of the photodiode within the optocoupler. A logic High level causes the OPA567 to be enabled, and a logic Low level disables the OPA567.
PAGE 16
SAFE OPERATING AREA (TA = 25°C) On 10 AND Output Current (A) Disable TFLAG Pin Enable Pin 10 8 9 11 OPA567 2, 3 Thermal pad soldered to 2 oz. copper pad, with 500lfm airflow. 1 Thermal pad soldered to 2 oz. copper pad, without forced air. 0.1 0 FIGURE 6. Enable/Shutdown Control Using TFLAG Pin and External Control Signal. 1 2 3 4 5 6 VS – VOUT (V) FIGURE 7. Safe Operating Area at Room Temperature.
PAGE 17
θJA The part is soldered to a 2 oz copper pad under the exposed pad. 38 Soldered to copper pad with forced airflow (150lfm). 36 Soldered to copper pad with forced airflow (250lfm). 35 Soldered to copper pad with forced airflow (500lfm). 34 THERMAL RESISTANCE vs NUMBER OF THERMAL VIAS 100 Thermal Resistance, θJA (°C/W) HEATSINKING METHOD FIGURE 9. Junction-to-Ambient Thermal Resistance with Various Heatsinking Efforts.
PAGE 18
QFN THERMALLY ENHANCED PACKAGE The OPA567 uses the QFN-12 package, a thermallyenhanced package designed to eliminate the use of bulky heat sinks and slugs traditionally used in thermal packages. This package can be easily mounted using standard printed circuit board (PCB) assembly techniques. See QFN/SON PCB Attachment Application Note (SLUA271) located at www.ti.com. The thermal resistance junction-to-ambient (RθJA) of the QFN package depends on the PCB layout.
PAGE 19
APPLICATION CIRCUITS R2 4.99kΩ fO = 10kHz 0.0033µF +1V 0V R1 49.9kΩ 0mA –100mA 1, 12 8 VIN 9 OPA567 (1) R3 49.9kΩ 2, 3 VO 6 RSET RSHUNT 1Ω 4, 5 IO 0V –2.5V Luxeon Star-0 High-Power LED –5V 4.99kΩ Feedback for Constant Current, 1V Input per 100mA Output as Shown. NOTE: (1) Bypass as recommended. FIGURE 13. Grounded Anode LED Driver.
PAGE 20
PACKAGE OPTION ADDENDUM www.ti.
PAGE 21
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant OPA567AIRHGR VQFN RHG 12 2500 330.0 12.4 5.3 5.3 1.5 8.0 12.0 Q2 OPA567AIRHGT VQFN RHG 12 250 180.0 12.4 5.3 5.3 1.5 8.0 12.
PAGE 22
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA567AIRHGR VQFN RHG 12 2500 367.0 367.0 35.0 OPA567AIRHGT VQFN RHG 12 250 210.0 185.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.