ZHCSMT4C October 2021 – November 2022 LMR51420
PRODUCTION DATA
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| SUPPLY | ||||||
| IQ(VIN) | VIN quiescent current (non-switching)(2) | VEN = 3 V, PFM variant only | 40 | 65 | μA | |
| ISD(VIN) | VIN shutdown supply current | VEN = 0 V | 3 | 15 | μA | |
| UVLO | ||||||
| VINUVLO(R) | VIN UVLO rising threshold | VIN rising | 3.89 | 4.5 | V | |
| VINUVLO(F) | VIN UVLO falling threshold | VIN falling | 3.35 | 3.58 | V | |
| VINUVLO(H) | VIN UVLO hysteresis | 0.3 | V | |||
| ENABLE | ||||||
| VEN(R) | EN voltage rising threshold | EN rising, enable switching | 1.1 | 1.227 | 1.36 | V |
| VEN(F) | EN voltage falling threshold | EN falling, disable switching | 0.95 | 1.08 | 1.22 | V |
| IEN(P2) | EN pin sourcing current post EN rising threshold | VEN = 3 V | 10 | 200 | nA | |
| REFERENCE VOLTAGE | ||||||
| Vfb | Reference voltage | 0.591 | 0.6 | 0.609 | V | |
| IFB(LKG) | FB input leakage current | VFB = 1.2 V | 0.8 | 50 | nA | |
| SWITCHING FREQUENCY | ||||||
| fSW1(CCM) | Switching frequency, CCM operation | 500-kHz trim option | 450 | 500 | 560 | kHz |
| fSW2(CCM) | Switching frequency, CCM operation | 1.1-MHz trim option | 0.95 | 1.1 | 1.25 | MHz |
| STARTUP | ||||||
| tSS | Internal fixed soft-start time | 3.2 | 4.0 | 5.4 | ms | |
| POWER STAGE | ||||||
| RDSON(HS) | High-side MOSFET on-resistance | TJ = 25℃ | 0.12 | Ω | ||
| RDSON(LS) | Low-side MOSFET on-resistance | TJ = 25℃ | 0.07 | Ω | ||
| tON(min) | Minimum ON pulse width | VIN = 12 V, IOUT = 2 A | 70 | ns | ||
| tON(max) | Maximum ON pulse width | VIN = 12 V, IOUT = 2 A | 6.76 | μs | ||
| tOFF(min) | Minimum OFF pulse width | VIN = 4.5 V | 150 | ns | ||
| OVERCURRENT PROTECTION | ||||||
| IHS_PK(OC) | High-side peak current limit(3) | LM51420 | 2.7 | 3.5 | 5.1 | A |
| ILS_V(OC) | Low-side valley current limit(3) | LM51420 | 1.7 | 2.5 | 3.4 | A |
| ILS(NOC) | Low-side negative current limit | LM51420 FPWM Only | –1 | A | ||
| IZC | Zero-cross detection current threshold | 0.02 | A | |||
| THERMAL SHUTDOWN | ||||||
| TJ(SD) | Thermal shutdown threshold(4) | Temperature rising | 163 | °C | ||
| TJ(HYS) | Thermal shutdown hysteresis(4) | 22 | °C | |||