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TPS2491DGS Datasheet(PDF) 3 Page - Texas Instruments |
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TPS2491DGS Datasheet(HTML) 3 Page - Texas Instruments |
3 / 20 page www.ti.com TPS2490 TPS2491 SLVS503 – NOVEMBER 2003 ELECTRICAL CHARACTERISTICS unless otherwise noted, minimum and maximum limits apply across the recommended operating junction temperature and voltage range, V TIMER = 0 V, and all outputs unloaded; typical specifications are at TJ = 25°C, VVCC = 48 V, VTIMER = 0 V, and all outputs unloaded; positive currents are into pins. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY CURRENT (VCC) Enabled VEN = Hi, VSENSE = VOUT = VVCC 450 1000 µA Disabled VEN = Lo, VSENSE = VVCC = VOUT = 0 90 250 µA CURRENT SENSE INPUT (SENSE) ISENSE Input bias current VSENSE = VVCC, VOUT = VVCC 7.5 20 µA REFERENCE VOLTAGE OUTPUT (VREF) VREF Reference voltage 0 < IVREF < 1 mA 3.9 4 4.1 V POWER LIMITING INPUT (PROG) Input bias current, device enabled, sourcing or IPROG 0 < VPROG < 4 V, VEN = 48 V 5 µA sinking RPROG Pulldown resistance, device disabled IPROG = 200 µA, VEN = 0 V 375 600 Ω POWER LIMITING AND CURRENT LIMITING (SENSE) Current sense threshold V(VCC-SENSE) with VPROG = 2.4 V, VOUT = 0 V or VCL 17 25 33 mV power limiting trip VPROG = 0.9 V, VOUT = 30 V, VVCC = 48 V VSENSE Current sense threshold V(VCC-sense) without VPROG = 4 V, VSENSE = VOUT 45 50 55 mV power limiting trip VPROG = 4 V, VOUT = VSENSE, tF_TRIP Large overload response time to GATE low(1) V(VCC-SENSE): 0 → 200 mV, 1.2 µS C(GATE-OUT) = 2 nF, V(GATE-OUT) = 1 V TIMER OPERATION (TIMER) VTIMER = 0 V 15.0 25.0 34.0 µA Charge current (sourcing) VTIMER = 0 V, TJ = 25°C 20.0 25.0 30.0 µA VTIMER = 5 V 1.50 2.5 3.70 µA Discharge current (sinking) VTIMER = 5 V, TJ = 25°C 2.10 2.5 3.10 µA TIMER upper threshold voltage 3.9 4 4.1 V TIMER lower reset threshold voltage TPS2491 only 0.96 1.0 1.04 V DRETRY Fault retry duty cycle TPS2491 only 0.5% 0.75% 1.0% GATE DRIVE OUTPUT (GATE) VSENSE = VVCC, V(GATE-OUT) = 7 V, IGATE GATE sourcing current 15 22 35 µA VEN = Hi VEN = Lo, VGATE = VVCC 1.8 2.4 2.8 mA GATE sinking current VEN = Hi, VGATE = VVCC, 75 125 250 mA V(VCC-SENSE)≥ 200 mV GATE output voltage, V(GATE-OUT) 12 16 V Propagation delay: EN going true to GATE VEN = 0 → 2.5 V, 50% of VEN to 50% of tD_ON 25 40 µS output high(1) VGATE, VOUT = VVCC, R(GATE-OUT)= 1 MΩ VEN = 2.5 V → 0, 50% of VEN to 50% of Propagation delay: EN going false (0 V) to tD_OFF VGATE, VOUT = VVCC, 0.5 1 µS GATE output low(1) R(GATE-OUT)= 1 MΩ, tFALL < 0.1 µS VTIMER: 0 → 5 V, tRISE < 0.1 µS, 50% of Propagation delay: TIMER expires to GATE VTIMER to 50% of VGATE, VOUT = VVCC, 0.8 1 µS output low(1) R(GATE-OUT) = 1 MΩ, POWER GOOD OUTPUT (PG) IPG = 2 mA 0.1 0.25 V VPG_L Low voltage (sinking) IPG = 4 mA 0.25 0.5 V PG threshold voltage, VOUT rising, PG goes VPGTL VSENSE = VVCC, measure V(VCC-OUT) 0.8 1.25 1.7 V open drain (1) Not tested in production. 3 |
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