SLVAFA9 March   2022 TPS82130 , TPSM82903

 

  1.   Trademarks
  2. 1Introduction
  3. 2Power Density
  4. 3Achieving a Smaller Solution
    1. 3.1 Fewer External Components
    2. 3.2 Smart Configuration Pin
    3. 3.3 VSET
  5. 4Reducing Power Loss
    1. 4.1 Junction Temperature
    2. 4.2 Automatic Efficiency Enhancement (AEE™)
    3. 4.3 Switching Frequencies and FET RDS(ON)
    4. 4.4 Auto PFM/PWM vs. Forced PWM
  6. 5Application Flexibility
    1. 5.1 Quiescent Current
    2. 5.2 Lower and More Accurate Output Voltages
    3. 5.3 Capacitive Discharge
  7. 6Summary
  8. 7References

1 Introduction

The TPSM8290x (TPSM82903, TPSM82902, TPSM82901) family is the next generation of 17-V, low Iq, high efficiency, and flexible synchronous step-down DC-DC converter MicroSiP™ module that is improved upon the previous family TPS821x0 (TPS82130, TPS82140, TPS82150). Table 1-1 shows the key features of each product and the improvements on the latest generation family. Each improved feature contributes to the leaps forward in the family. In turn, the improved device, a small part of a design, contributes to ground-breaking advancements in technology. This application report provides a comparison between these two device families, as well as an explanation of how the changes benefit the user more than the previous version.

Table 1-1 Feature Comparison of TPS821x0 and TPSM8290x
FeaturesTPS82130TPSM8290xImprovements
VOUT0.9 V to 6 V0.4 V to 5.5 VTPSM82903 supports lower Vout down to 400 mV.
Typical quiescent current IQ20uA4uALower IQ, longer battery life. See Section 5.1.
FB accuracy (Full Temperature range)1.8%0.9%Tighter VREF accuracy. TPSM82903 also has VSET option that removes the requirements for external feedback resistors and improves that total system accuracy. See Section 5.2.
Package size/Total solution size 3.0 mmx2.8 mm MicroSiPTM /29mm23.0 mmx2.8 mm MicroSiPTM/25mm2Both device use the same package. The TPSM82903 has VSET option that can be used to save the external feedback resistors. Also the Softstart capacitor is optional. See Section 3.1.
Smart configurationNoYesFewer external components needed to configure device. See Section 3.2.
Recommended Junction Temperature-40°C to 110°C-40°C to 125°CSupports higher Tj up to 125°C. See Section 4.1.
Switching Frequency2.5 MHz2.5 MHz and 1 MHzProvides Adjustable switching frequency. See Section 4.3.
RDS(ON)120 mΩ high side/50 mΩ low side62 mΩ high side/22 mΩ low sideLess power loss and better thermals. See Section 4.3
Efficiency (12 Vin, 1.2 Vo, 3 A)71.5%76.5%Improved efficiency. TPS82903 offers 1MHz Fsw, in addition to improved RDS(ON). See Section 4.3.
Automatic Efficiency Enhancement (AEE)NoYesHigh efficiency for varying duty cycles. See Section 4.2.
Capacitive dischargeUsing PGUsing Smart ConfigAchieved internally when selected. See Section 5.3.
Mode Supports Auto PFM/PWM only Supports both Auto PFM/PWM and FPWM Forced PWM mode is offered in the TPSM8290x in addition to Auto PFM/PWM. See Section 4.4.
VSETNoYesThis allows for internal divider that has lower BOM count and better overs systems accuracy. See Section 3.3.