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MAX1902 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1902 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 33 page 500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers 6 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, both PWMs on, SYNC = VL, VL load = 0, REF load = 0, SKIP = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 7) PARAMETER CONDITIONS MIN TYP MAX UNITS V+ Standby Supply Current V+ = 5.5V to 30V, both SMPSs off, includes current into SHDN 60 µA V+ Standby Supply Current in Dropout V+ = 4.2V to 5.5V, both SMPSs off, includes current into SHDN 200 µA V+ Shutdown Supply Current V+ = 4.0V to 30V, SHDN = 0 10 µA (Note 3) 4 Quiescent Power Consumption Both SMPSs enabled, FB3 = FB5 = 0, CSL3 = CSH3 = 3.5V, CSL5 = CSH5 = 5.3V MAX1901/MAX1904 4 mW FAULT DETECTION (MAX1901/MAX1902) Overvoltage Trip Threshold With respect to unloaded output voltage 4 10 % Output Undervoltage Threshold With respect to unloaded output voltage 60 80 % Output Undervoltage Lockout Time From each SMPS enabled, with respect to fOSC 5,000 7,000 clks RESET RESET Trip Threshold With respect to unloaded output voltage, falling edge; typical hysteresis = 1% -7 -4 RESET Delay Time With respect to fOSC 27,000 37,000 % clks INPUTS AND OUTPUTS Feedback-Input Leakage Current FB3, FB5; SECFB = 2.6V 50 nA Logic Input-Low Voltage RUN/ON3, SKIP, TIME/ON5 (SEQ = REF), SHDN, STEER, SYNC 0.6 V Logic Input-High Voltage RUN/ON3, SKIP, TIME/ON5 (SEQ = REF), SHDN, STEER, SYNC 2.4 V Logic Output-Low Voltage RESET, ISINK = 4mA 0.4 V Logic Output-High Current RESET = 3.5V 1 mA TIME/ON5 Input Trip Level SEQ = 0 or VL 2.4 2.6 V TIME/ON5 Source Current TIME/ON5 = 0, SEQ = 0 or VL 2.5 3.5 µA TIME/ON5 On-Resistance TIME/ON5; RUN/ON3 = 0, SEQ = 0 or VL 80 Ω SSOP package 7 Gate-Driver On-Resistance High or low (Note 6) QFN package 8 Ω Note 1: Each of the four digital soft-start levels is tested for functionality; the steps are typically in 20mV increments. Note 2: High duty-factor operation supports low input-to-output differential voltages, and is achieved at a lowered operating frequency (see the Dropout Operation section). Note 3: MAX1902 only. Note 4: Off mode for the 12V linear regulator occurs when the SMPS that has flyback feedback (VDD) steered to it is disabled. In situa- tions where the main outputs are being held up by external keep-alive supplies, turning off the 12OUT regulator prevents a leak- age path from the output-referred flyback winding, through the rectifier, and into VDD. Note 5: Since the reference uses VL as its supply, the reference’s V+ line-regulation error is insignificant. Note 6: Production testing limitations due to package handing require relaxed maximum on-resistance specifications for the thin QFN package. The SSOP and thin QFN package contain the same die, and the thin QFN package imposes no additional resistance incircuit. Note 7: Specifications from to 0°C to -40°C are guaranteed by design, not production tested. |
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