ZHCSMC1B october 2020 – august 2023 LM5157-Q1 , LM51571-Q1
PRODUCTION DATA
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| SUPPLY CURRENT | ||||||
| ISHUTDOWN(BIAS) | BIAS shutdown current | VBIAS = 12 V, VUVLO = 0 V | 2.6 | 5 | μA | |
| IOPERATING(BIAS) | BIAS operating current | VBIAS = 12 V, VUVLO = 2.0 V, VFB = VREF, RT = 220 kΩ | 700 | 775 | μA | |
| VCC REGULATOR | ||||||
| VVCC-REG | VCC regulation | VBIAS = 8 V, IVCC = 18 mA | 4.66 | 4.9 | 5.14 | V |
| VVCC-UVLO(RISING) | VCC UVLO threshold | VCC rising | 2.75 | 2.8 | 2.85 | V |
| VCC UVLO hysteresis | VCC falling | 0.1 | V | |||
| ENABLE | ||||||
| VEN(RISING) | Enable threshold | EN rising | 0.4 | 0.52 | 0.7 | V |
| VEN(FALLING) | Enable threshold | EN falling | 0.33 | 0.49 | 0.63 | V |
| VEN(HYS) | Enable hysteresis | EN falling | 0.03 | V | ||
| UVLO/SYNC | ||||||
| VUVLO(RISING) | UVLO / SYNC threshold | UVLO rising | 1.425 | 1.5 | 1.575 | V |
| VUVLO(FALLING) | UVLO / SYNC threshold | UVLO falling | 1.370 | 1.45 | 1.520 | V |
| VUVLO(HYS) | UVLO / SYNC threshold hysteresis | UVLO falling | 0.05 | V | ||
| IUVLO | UVLO hysteresis current | VUVLO = 1.6 V | 4 | 5 | 6 | μA |
| MODE, SPREAD SPECTRUM | ||||||
| FSW modulation (upper limit) | 7.8% | |||||
| FSW modulation (lower limit) | –7.8% | |||||
| SS | ||||||
| ISS | Soft-start current | 9 | 10 | 11 | μA | |
| SS pulldown switch RDSON | 50 | Ω | ||||
| PULSE WIDTH MODULATION | ||||||
| fsw1 | Switching frequency | RT = 220 kΩ | 85 | 100 | 115 | kHz |
| fsw2 | Switching frequency | RT = 49.3 kΩ | 388 | 440 | 492 | kHz |
| fsw3 | Switching frequency | RT = 9.09 kΩ | 1980 | 2200 | 2420 | kHz |
| tON(MIN) | Minimum on time | RT = 9.09 kΩ | 80 | ns | ||
| DMAX1 | Maximum duty cycle limit | RT = 9.09 kΩ | 80% | 85% | 90% | |
| DMAX2 | Maximum duty cycle limit | RT = 220 kΩ | 90% | 93% | 96% | |
| RT regulation voltage | 0.5 | V | ||||
| CURRENT LIMIT | ||||||
| ILIM | Internal MOSFET current limit | LM5157 | 6.5 | 7.5 | 8.5 | A |
| Internal MOSFET current limit | LM51571 | 4.33 | 5 | 5.67 | A | |
| HICCUP MODE PROTECTION | ||||||
| Hiccup enable cycles | 64 | Cycles | ||||
| Hiccup timer reset cycles | 8 | Cycles | ||||
| ERROR AMPLIFIER | ||||||
| VREF | FB reference | 0.99 | 1 | 1.01 | V | |
| Gm | Transconductance | 2 | mA/V | |||
| COMP sourcing current | VCOMP = 1.2 V | 180 | μA | |||
| COMP clamp voltage | COMP rising (VUVLO = 2.0 V) | 2.5 | 2.8 | V | ||
| COMP clamp voltage | COMP falling | 1 | 1.1 | V | ||
| ACS | ΔVCOMP / ΔISW | 0.095 | ||||
| OVP | ||||||
| VOVTH | Overvoltage threshold | FB rising (referece to VREF) | 107% | 110% | 113% | |
| Overvoltage threshold | FB falling (referece to VREF) | 105% | ||||
| PGOOD | ||||||
| PGOOD pulldown switch RDSON | 1 mA sinking | 70 | Ω | |||
| VUVTH | Undervoltage threshold | FB falling (referece to VREF) | 87% | 90% | 93% | |
| Undervoltage threshold | FB rising (referece to VREF) | 95% | ||||
| POWER SWITCH | ||||||
| rDS(ON) | Internal MOSFET on-resistance | VBIAS = 12 V | 45 | 90 | mΩ | |
| VBIAS = 3.5 V | 47 | 95 | mΩ | |||
| Leakage current | VSW = 12 V | 1200 | nA | |||
| THERMAL SHUTDOWN | ||||||
| TTSD | Thermal shutdown threshold | Temperature rising | 175 | °C | ||
| Thermal shutdown hysteresis | 15 | °C | ||||