| PARAMETER | SYMBOL | CONDITIONS | MIN | TYP | MAX | UNITS | |
|---|---|---|---|---|---|---|---|
| Supply Voltage Range | VSUP | 3.5 | 36 | V | |||
| t < 1s | 40 | ||||||
| VSUP | After soft-start | 3 | 36 | ||||
| Supply Current | ISUP | VEN = low | 1 | 5 | µA | ||
| MAX25231ATCB/V+, no load, no switching | 3.5 | 8 | |||||
| MAX25231ATCB/V+, no load, switching (Note 2) | 4.5 | ||||||
| MAX25231ATCA/V+, no load, no switching | 5.6 | 10 | |||||
| MAX25231ATCA/V+, no load, switching (Note 2) | 6.6 | ||||||
| LX Leakage | ILX,LEAK | VSUP = 40V, LX = 0 or 40V, TA = +25°C | -1 | +1 | µA | ||
| Undervoltage Lockout | UVLO | OUT rising | 2.52 | 2.73 | 2.93 | V | |
| Hysteresis | 0.16 | ||||||
| BIAS Voltage | VBIAS | 5.5V ≤ VSUP ≤ 36V, FPWM mode | 5 | V | |||
| BUCK CONVERTER | |||||||
| Voltage Accuracy, 5V | VOUT,5V | MAX25231ATCA/V+ skip mode (Note 2) | 4.87 | 5 | 5.08 | V | |
| MAX25231ATCA/V+ fixed-frequency PWM mode | 4.93 | 5 | 5.07 | ||||
| Voltage Accuracy, 3.3V | VOUT,3.3V | MAX25231ATCB/V+, skip mode | 3.18 | 3.3 | 3.37 | V | |
| MAX25231ATCB/V+, fixed-frequency PWM mode | 3.25 | 3.3 | 3.35 | ||||
| Output Voltage Range | VOUT | MAX25231ATCD/V+ | 3 | 10 | V | ||
| FB Voltage Accuracy | VFB | MAX25231ATCD/V+ only | 0.985 | 1 | 1.015 | V | |
| FB Current | IFB | VFB = 1V, TA = +25ºC | 0.02 | μA | |||
| FB Line Regulation | VSUP = 6V to 36V | 0.02 | %/V | ||||
| High-Side Switch On-Resistance | RON,HS | VBIAS = 5V, ILX = 1.2A | 300 | mΩ | |||
| Low-Side Switch On-Resistance | RON,LS | VBIAS = 5V, ILX= 1.2A | 200 | mΩ | |||
| High-Side Current-Limit Threshold | MAX25231 | 1.67 | 1.9 | 2.13 | A | ||
| Low-Side Negative Current- Limit Threshold | INEG | -0.6 | A | ||||
| Soft-Start Ramp Time | ISS | 2.5 | 5 | ms | |||
| Minimum On-Time | tON | 66 | 85 | ns | |||
| Maximum Duty Cycle | 98 | 99 | % | ||||
| PWM Switching Frequency | fSW | Fixed | 1.925 | 2.1 | 2.275 | MHz | |
| Spread-Spectrum Range | SS | VSPS = 5V | ±6 | % | |||
| PGOOD | |||||||
| PGOOD Threshold, Rising | VTHR,PGD | VOUT rising | MAX25231ATCA/V+ | 90 | 93.5 | 97 | % |
| PGOOD Threshold, Falling | VTHF,PGD | VOUT falling | MAX25231ATCA/V+ | 89.5 | 93 | 96.5 | % |
| PGOOD Debounce Time | tDEB | PWM mode, VOUT falling | 65 | µs | |||
| Skip mode, VOUT rising | 100 | ||||||
| PGOOD High-Leakage Current | ILEAK,PGD | TA = +25°C | 1 | µA | |||
| PGOOD Low Level | VOUT,PGD | Sinking 1mA | 0.4 | V | |||
| LOGIC LEVELS | |||||||
| EN Level, High | VIH,EN | 2.4 | V | ||||
| EN Level, Low | VIL,EN | 0.6 | V | ||||
| EN Input Current | IIN,EN | VEN = VSUP = 14V, TA = +25°C | 1 | µA | |||
| External Input Clock Frequency | 1.7 | 2.6 | MHz | ||||
| SYNC Threshold, High | VIH,SYNC | 1.4 | V | ||||
| SYNC Threshold, Low | VIL,SYNC | 0.4 | V | ||||
| SYNC Internal Pulldown | RPD,MODE | 1000 | kΩ | ||||
| SPS Threshold, High | VIH,SPS | 1.4 | V | ||||
| SPS Threshold, Low | VIL,SPS | 0.4 | V | ||||
| SPS Internal Pulldown | 1000 | kΩ | |||||
| THERMAL PROTECTION | |||||||
| Thermal Shutdown | TSHDN | (Note 3) | 175 | °C | |||
| Thermal-Shutdown Hysteresis | TSHDN.HYS | (Note 3) | 15 | °C | |||
| Note 2: | Guaranteed by design; not production tested. |
| Note 3: | Limits are 100% tested at TA + +25°C. Limits over the operating range and relevant supply voltage are guaranteed by design and characterization. Typical values are at TA = +25°C. |
| Note 4: | The device is designed for continuous operation up to TJ = +125°C for 95,000 hours and TJ = +150°C for 5,000 hours. |
{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 2\u003c/strong\u003e","data-html":true,"data-content":"Guaranteed by design; not production tested."}
{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 2\u003c/strong\u003e","data-html":true,"data-content":"Guaranteed by design; not production tested."}
{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 2\u003c/strong\u003e","data-html":true,"data-content":"Guaranteed by design; not production tested."}
{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 3\u003c/strong\u003e","data-html":true,"data-content":"Limits are 100% tested at TA + +25°C. Limits over the operating range and relevant supply voltage are guaranteed by design and characterization. Typical values are at TA = +25°C."}
{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 3\u003c/strong\u003e","data-html":true,"data-content":"Limits are 100% tested at TA + +25°C. Limits over the operating range and relevant supply voltage are guaranteed by design and characterization. Typical values are at TA = +25°C."}