SLVAEL7A December   2019  – August 2024 TPS7B7701-Q1 , TPS7B7702-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 Single-Channel FIT Rate
    2. 2.2 Dual-Channel Package FIT Rate
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 Single-Channel Package
    2. 4.2 Dual-Channel Package
  7. 5Revision History

Single-Channel Package

TPS7B7701-Q1 TPS7B7702-Q1 Single-Channel, TPS7B7701-Q1
                    PWP Package, 16-Pin HTSSOP With PowerPAD
                    Integrated Circuit Package (Top View) Figure 4-1 Single-Channel, TPS7B7701-Q1 PWP Package, 16-Pin HTSSOP With PowerPAD™ Integrated Circuit Package (Top View)
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
IN 1 No input to the device. The output is off. B
EN 2 No input to the device. The output is off. B
NC 3 No effect, normal operation D
VCC 4 Device cannot turn on. B
SENSE 5 No use of current sense functionality B
NC 6 No effect, normal operation. D
NC 7 No effect, normal operation. D
SENSE_EN 8 Sense functionality enabled. B
ERR 9 Device falsely reports error signal. B
LIM 10 Current limit is set to default. B
NC 11 No effect, normal operation. D
GND 12 No effect, normal operation. D
NC 13 No effect, normal operation. D
NC 14 No effect, normal operation. D
FB 15 Device acts as a switch. B
OUT 16 Regulation is not possible; the device operates at current limit. The device can cylce in and out of thermal shutdown. B
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
IN 1 No input, the output is at ground. B
EN 2 Device not enabled, the output is at ground. B
NC 3 No effect, normal operation. D
VCC 4 Device still operates, but internal regulator output VCC oscillates, and so output noise is increased, and noise on the SENSEx, ILIMx pins also increases C
SENSE 5 No change in device function; no access to SENSE outputs. B
NC 6 No effect, normal operation. D
NC 7 No effect, normal operation. D
SENSE_EN 8 SENSE_EN is always active (low) (there is an internal pulldown resistor) B
ERR 9 No access to error signal. B
LIM 10 When LIMx is open, OUTx does not turn on. B
NC 11 No effect, normal operation. D
GND 12 There is no current loop for internal biasing, so the device cannot function. B
NC 13 No effect, normal operation. D
NC 14 No effect, normal operation. D
FB 15 The error amplifier input is not connected. The output voltage is indeterminate. B
OUT 16 The load is not powered. B
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin Name Pin No. Shorted to Description of Potential Failure Effects Failure Effect Class
IN 1 EN (Pin 2) Device is always powered. D
EN 2 NC (Pin 3) No effect. Normal operation. D
NC 3 NC (Pin 4) No effect. Normal operation. D
VCC 4 Sense (Pin 5) Internal circuitry has less headroom and performance degrades. C
SENSE 5 NC (Pin 6) No effect. Normal operation. D
NC 6 NC (Pin 7) No effect. Normal operation. D
NC 7 Sense_EN (Pin 8) No effect. Normal operation. D
ERR 9 Lim (Pin 10) If ERR is pulled high, no effect. If ERR is pulled low, current limit increases. B
LIM 10 NC (Pin 11) No effect. Normal operation. D
NC 11 GND (Pin 12) No effect. Normal operation. D
GND 12 NC (Pin 13) No effect. Normal operation. D
NC 13 NC (Pin 14) No effect. Normal operation. D
NC 14 FB (Pin 15) No effect. Normal operation. D
FB 15 Out (Pin 16) Output voltage is equal to the internal reference voltage. If OUT is forced to greater than 7V, FB can be damaged. B/A
Table 4-5 Pin FMA for Device Pins Short-Circuited to supply
Pin Name Pin No. Description of Potential Failure Effects Failure Effect Class
IN 1 No effect, normal operation. D
EN 2 Device is always enabled. B
NC 3 No effect, normal operation. D
VCC 4 IN is greater than 6V, VCC can be damaged. IN is less that 6V, Output can be out of regulation. SENSE outputs incorrect. A/B
SENSE 5 If IN is greater than VCC + 0.3V, SENSE can be damaged. If IN is less than VCC + 0.3V, lose sense functionality. A/B
NC 6 No effect, normal operation. D
NC 7 No effect, normal operation. D
SENSE_EN 8 If IN is greater than 7V, SENSE_EN can be damaged. If IN is less than 7V, sense functionality is always disabled. A/B
ERR 9 If IN is greater than 7V, ERR can be damaged. If IN is less than 7V, loss of error functionality. A/B
LIM 10 If IN is greater than 7V, LIM can be damaged. If IN is less than 7V, VOUTx does not come up A/B
NC 11 No effect, normal operation. D
GND 12 Supply is shorted to GND, no output voltage. B
NC 13 No effect, normal operation. D
NC 14 No effect, normal operation. D
FB 15 If supply is greater than 7V, the maximum rating for FB is violated and can damage the device. If supply is less than 7V, the output is approximately 0V. B
OUT 16 Regulation not possible. Vout = Vin. B