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TPS54386-Q1 Datasheet(PDF) 3 Page - Texas Instruments |
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TPS54386-Q1 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 50 page TPS54386-Q1 www.ti.com SLUSAZ9A – MARCH 2012 – REVISED MARCH 2012 ELECTRICAL CHARACTERISTICS –40°C ≤ TA ≤ 105°C, VPVDD1 = VPVDD2 = 12 V, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT SUPPLY (PVDD) VPVDD1 4.5 28 V Input voltage range VPVDD2 4.5 28 V IDDSDN Shutdown V EN1 = V EN2 = VPVDD2 70 150 μA IDDQ Quiescent, non-switching VFB = 0.9 V, outputs off 1.8 3 mA SW node unloaded; Measured as BP sink IDDSW Quiescent, while-switching 5 current VUVLO Minimum turnon voltage PVDD2 only 3.8 4.1 4.4 V VUVLO(hys) Hysteresis 400 mV CBP = 10 μF, EN1 and EN2 go low tSTART (1) (2) Time from start-up to soft-start begin 2 ms simultaneously ENABLE (EN) VEN1 0.9 1.2 1.5 V Enable threshold VEN2 0.9 1.2 1.5 V Hysteresis 50 mV IEN1 6 12 μA Enable pullup current V EN1 = V EN2 = 0 V IEN2 6 12 μA tEN (1) Time from enable to soft-start begin Other EN pin = GND 10 μs BP REGULATOR (BP) BP Regulator voltage 8 V < PVDD2 < 28 V 5 5.25 5.6 V PVDD2 = 4.5 V; switching, no external load on BPLDO Dropout voltage 400 mV BP IBP (1) Regulator external load 2 mA IBPS Regulator short circuit 4.5 V < PVDD2 < 28 V 10 20 30 mA OSCILLATOR fSW Switching frequency 510 630 750 kHz tDEAD (1) Clock dead time 140 ns ERROR AMPLIFIER (EA) and VOLTAGE REFERENCE (REF) VFB1 0°C < TA < 85°C 788 800 812 mV Feedback input voltage VFB2 –40°C < TA < 125°C 786 812 mV IFB1 3 50 nA Feedback input bias current IFB2 3 50 nA gM1 (1) 30 μS Transconductance gM2 (1) 30 μS SOFT START (SS) TSS1 1.5 2.1 2.7 ms Soft-start time TSS2 1.5 2.1 2.7 ms OVERCURRENT PROTECTION ICL1 Current limit channel 1 3.6 4.5 5.6 A VILIM2 = VBP 3.6 4.5 5.6 ICL2 Current limit channel 2 VILIM2 = (floating) 2.4 3 3.6 A VILIM2 = GND 1.15 1.5 1.75 VUV1 670 mV Low-level output threshold to declare a fault Measured at feedback pin VUV2 670 mV tHICCUP (1) Hiccup timeout 10 ms tON1(oc) (1) 90 150 ns Minimum overcurrent pulse duration tON2(oc) (1) 90 150 ns (1) Ensured by design. Not production tested. (2) When both outputs are started simultaneously, a 20-mA current source charges the BP capacitor. Faster times are possible with a lower BP capacitor value. More information can be found in the Input UVLO and Startup section. Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): TPS54386-Q1 |
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