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SLUS774 Datasheet(PDF) 3 Page - Texas Instruments |
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SLUS774 Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 55 page  www.ti.com ELECTRICAL CHARACTERISTICS TPS54283,, TPS54286 SLUS749C – JULY 2007 – REVISED OCTOBER 2007 –40 °C ≤ T J ≤ +125°C, VPVDD1 = VPVDD2 = 12 V, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT SUPPLY (PVDD) VPVDD1 Input voltage range 4.5 28 V VPVDD2 IDDSDN Shutdown VEN1 = VEN2 = VPVDD2 70 150 µA IDDQ Quiescent, non-switching VFB = 0.9V, Outputs off 1.8 3.0 mA SW node unloaded; Measured as BP sink IDDSW Quiescent, while-switching 5 current VUVLO Minimum turn-on 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 startup to softstart begin 2 ms simultaneously ENABLE (EN) VEN1 Enable threshold 0.9 1.2 1.5 V VEN2 Hysteresis 50 mV IEN1 Enable pull-up current VEN1 = VEN2 = 0 V 6 12 µA IEN2 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 OSCILLATOR TPS54283 255 310 375 fSW Switching frequency kHz TPS54286 510 630 750 tDEAD (1) Clock dead time 140 ns ERROR AMPLIFIER (EA) and VOLTAGE REFERENCE (REF) VFB1 0 °C < T J < +85°C 788 800 812 Feedback input voltage mV VFB2 –40 °C < T J < +125°C 786 812 IFB1 Feedback input bias current 3 50 nA IFB2 gM1 (1) Transconductance 30 µS gM2 (1) SOFT START (SS) TSS1 Soft start time 1.5 2.1 2.7 ms TSS2 OVERCURRENT PROTECTION ICL1 Current limit channel 1 2.4 3.0 3.6 VILIM2 = VBP 1.15 1.50 1.75 A ICL2 Current limit channel 2 VILIM2 = (floating) 2.4 3.0 3.6 VILIM2 = GND 1.15 1.50 1.75 VUV1 Low-level output threshold to declare a fault Measured at feedback pin. 670 mV VUV2 THICCUP (1) Hiccup timeout 10 ms tON1(oc) (1) Minimum overcurrent pulse width 90 150 ns tON2(oc) (1) (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 © 2007, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): TPS54283 TPS54286 |
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