TS982 STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 20
Technical content
Datasheet sections
- 1 Absolute maximum ratings and operating conditions
- 2 Electrical characteristics
- 3 Application information
- 3.1 Exposed-pad package description
- 3.2 Exposed-pad electrical connection
- 3.3 Thermal management benefits
- 3.4 Thermal management guidelines
- 3.5 Parallel operation
- 4 Package information
- 5 Ordering information
- 6 Revision history
Features
■ Operating from VCC = 2.5 V to 5.5 V ■ 200 mA output current on each amplifier ■ High dissipation package ■ Rail-to-rail input and output ■ Unity-gain stable
Applications
■ Hall sensor compensation coil ■ Servo amplifier ■ Motor driver ■ Industrial ■ Automotive
Description
The TS982 is a dual operational amplifier able to drive 200 mA down to voltages as low as 2.7 V. The SO-8 exposed-pad package allows high current output at high ambient temperatures making it a reliable solution for automotive and industrial applications. The TS982 is stable with a unity gain. Pin connections (top view) DW SO-8 exposed-pad (Plastic micropackage) VCC - VCC +1 6Non Inverting Input1 Inverting Input1 Output2 Output1 Non Inverting Input2 Inverting Input2 Cross Section View Showing Exposed-Pad This pad can be connected to a (-Vcc) copper area on the PCB VCC - VCC +1 6Non Inverting Input1 Inverting Input1 Output2 Output1 Non Inverting Input2 Inverting Input2 Cross Section View Showing Exposed-Pad This pad can be connected to a (-Vcc) copper area on the PCB
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings (AMR)
- All voltage values are measur ed with respect to the ground pin.
- With two sides, two-plane PCB follow ing the EIA/JEDEC JESD51-7 standard.
- Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a
while the other pins are floating.
- Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.
- Machine model: A 200 pF capacitor is charged to t he specified voltage, then discharged directly between
connected pin combinations while the other pins are floating.
- Short-circuits can cause excessive heating. Destructive dissipation can result from a short-circuit on one or
two amplifiers simultaneously. Table 2. Operating conditions
2 Electrical characteristics
Table 3. Electrical characteristics for V CC+ = +5 V, VCC- = 0 V, and Tamb = 25° C
Table 4. Electrical characteristics for V CC+ = +3.3 V, VCC- = 0 V, and Tamb = 25° C
- All electrical values are guaranteed by correlation with measurements at 2.7 V and 5 V.
Table 6. Electrical characteristics for V CC = +2.7 V, VCC- = 0 V, and Tamb = 25° C
3 Application information
3.1 Exposed-pad package description
The dual operational amplifier TS982 is housed in an SO-8 exposed-pad plastic package. Figure 40. Exposed-pad plastic package the copper area and the number of layers of the printed circuit board under the pad. Figure 41. TS982 test board layout: 6 cm 2 of copper topside
3.2 Exposed-pad electrical connection
Figure 40). The silicon substrate is not directly connected to the pad because of the glue.
3.3 Thermal management benefits
A good thermal design is important to maintain the temperature of the silicon junction below Tj = 150° C as given in the absolute maximum ratings and also to maintain the operating power level. Another effect of temperature is that the life expectancy of an integrated circuit decreases exponentially when operating at high temperature over an extended period of time. It is estimated that, the chip failure rate doubles for every 10° to 20° C. This demonstrates that reducing the junction temperature is also important to improve the reliability of the amplifier. Because of the high dissipation capability of the SO-8 exposed-pad package, the dual op- amp TS982 has a lower junction temperature for high current applications in high ambient temperatures.
3.4 Thermal management guidelines
The following guidelines are a simple procedure to determine the PCB you should use in order to get the best from the SO-8 exposed-pad package: 1. Determine the total power P total to be dissipated by the IC. Ptotal = ICC x VCC + Vdrop1 x Iout1+ Vdrop2 x Iout2 ICC x VCC is the DC power needed by the TS982 to operate with no load. Refer to Figure 1: Current consumption vs. supply voltage on page 7 to determine ICC versus VCC and versus temperature. The other terms are the power dissipated by the two operators to source the load. If the output signal can be assimilated to a DC signal, you can calculate the dissipated power using the voltage drop curves versus output current, supply voltage, and temperature (Figure 2 on page 7 to Figure 8 on page 8). 2. Specify the maximum operating temperature, (T a) of the TS982. 3. Specify the maximum junction temperature (T j) at the maximum output power. As discussed above, Tj must be below 150°C and as low as possible for reliability considerations. Therefore, the maximum thermal resistance between junction and ambient Rthja is: Rthja = (Tj - Ta)/Ptotal Different PCBs can give the right Rthja for a given application. Figure 42 gives the Rthja of the SO-8 exposed pad versus the copper area of a top side PCB.
Figure 42. R thja of the TS982 vs. top side copper area 45° C/W by using two power planes and metallized holes.
3.5 Parallel operation
Figure 43. Parallel operation: 400 mA output current
4 Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com
Figure 44. SO-8 exposed pad package mechanical drawing Table 7. SO-8 exposed pad package mechanical data
5 Ordering information
6 Revision history
Table 8. Order codes
- Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening
according to AEC Q001 & Q 002 or equivalent. Table 9. Document revision history 02-Jan-2004 1 First release. 01-Feb- 2004 2 Order codes modified on cover page. Table 3. on page 4. Section 3.4: Thermal management guidelines on page 15. Corrected value of VOH for VCC = 2.7 V. Moved ordering information from cover page to end of document.