SLVAG34 August   2026 TPS650362-Q1 , TPS65219-Q1 , TPS65224-Q1

 

  1.   1
  2.   Abstract
  3. 1Introduction
  4. 2Causes of PMICs Failing to Resume Operation Due to Slow Voltage Ramp Tests
    1. 2.1 Two Input Undervoltage Lockout (UVLO) Mechanisms of PMICs
    2. 2.2 Repeated PVIN_B1_UVLO Triggers Force the PMIC into WT_PWR_REC State
    3. 2.3 Reasons Why Slow Voltage Ramp Causes the PMIC to Enter WT_PWR_REC State
  5. 3Common Solutions for Wide-Input PMICs
    1. 3.1 Increase the Gap Between PVIN_B1_UVLO Rising and Falling
    2. 3.2 Replace Reverse-Polarity Protection Diode with an Ideal Diode
    3. 3.3 TPS650362-Q1 Can Use Resistive Discharge Instead of Active Discharge
  6. 4Common Solutions for Low-Input PMICs
    1. 4.1 Adjusting Primary BUCK Loop Stability
    2. 4.2 Prevent Primary BUCK from Entering Dropout Mode During Slow Ramp Testing
  7. 5Non-Functional Safety Systems Can Disable/Mask RECOV_CNT_THR to Avoid Entering SAFE/OFF States
  8. 6References

2.2 Repeated PVIN_B1_UVLO Triggers Force the PMIC into WT_PWR_REC State

PVIN_B1_UVLO features programmable Falling and Rising thresholds; as input voltage rises, it must reach PVIN_B1_UVLO Rising to enable output, and as input voltage drops, reaching PVIN_B1_UVLO Falling turns output off.

When the input voltage of TPS650362-Q1 drops below PVIN_B1_UVLO Falling, outputs turn off, the PMIC enters SAFE state, and an error interrupt is generated. In the SAFE state, if input voltage exceeds PVIN_B1 UVLO Rising and no other error interrupts exist, the PMIC re-enters Active state. Each time the PMIC enters SAFE state and recovers, the RECOV_CNT counter increments by +1. When the count reaches RECOV_CNT_THR, the PMIC enters WT_PWR_REC state, requiring a power cycle on VSYS to restart the PMIC. The RECOV_CNT_THR threshold defaults to 15 times; the RECOV_CNT counter can be cleared by register operation or power-cycling to trigger VSYS_UVLO restart.

The input protection mechanism of TPS65224-Q1 is similar to that of TPS650362-Q1, where triggering VCCA0V_TH leads to a PMIC Warm Reset and transitions to To SAFE state. When input voltage exceeds VCCA0V_TH, the PMIC re-enters Active state. Each transition to To SAFE increments RECOV_CNT by +1; once the count exceeds RECOV_CNT_THR, TPS65224-Q1 remains in SAFE_RECOVER state, requiring a power-cycle to restart the PMIC.

TPS650362-Q1 state machineFigure 2-2 TPS650362-Q1 state machine