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TPS54122RHLR Datasheet(PDF) 5 Page - Texas Instruments |
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TPS54122RHLR Datasheet(HTML) 5 Page - Texas Instruments |
5 / 40 page 5 TPS54122 www.ti.com SBVS221B – NOVEMBER 2013 – REVISED AUGUST 2016 Product Folder Links: TPS54122 Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated (1) For more information about traditional and new thermal metrics, see Semiconductor and IC Package Thermal Metrics (SPRA953). 6.4 Thermal Information THERMAL METRIC(1) TPS54122 UNIT RHL (VQFN) 24 PINS RθJA Junction-to-ambient thermal resistance 34.9 °C/W RθJC(top) Junction-to-case(top) thermal resistance 39.0 °C/W RθJB Junction-to-board thermal resistance 13.5 °C/W ψJT Junction-to-top characterization parameter 0.3 °C/W ψJB Junction-to-board characterization parameter 13.6 °C/W RθJC(bot) Junction-to-case(bottom) thermal resistance 1.4 °C/W (1) DC-DC_OUT refers to the regulated output voltage of the switching regulator (see Figure 27). 6.5 Electrical Characteristics at TJ = –40°C to +125°C, VBIAS = VVIN = 5 V, VLDOIN = DC-DC_OUT (1) = 2.1 V, V LDOEN = 1.1 V, VO = 1.8 V, IO = 50 mA, VEN = floating, and COUT = 10.0 μF, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT POWER SUPPLY (VIN PIN) VVIN VIN pin input voltage range 2.95 6 V UVLO threshold 2.6 2.8 V ISD(VIN) VIN pin shutdown current VEN < 0.3 V 2 µA I(OP) VIN pin operating current (no switching) VVSENSE = 900 mV 360 575 µA DC-DC BOOT (BOOT PIN) (VBOOT – VPH) UVLO 2.2 V Boot charge resistance VEN = 3 V 16 Ω DC-DC CONVERTER ENABLE (EN PIN) VIL(EN) EN pin low-level input voltage Falling 1.18 V VIH(EN) EN pin high-level input voltage Rising 1.25 V IEN EN pin input current VEN = 1.13 V 1.2 µA VEN = 1.3 V 4.6 µA DC-DC CONVERTER VOLTAGE REFERENCE Vref Reference voltage 2.95 V ≤ VVIN ≤ 6 V 0.802 0.827 0.852 V DC-DC MOSFET RHS High-side switch resistance VBOOT – VPH = 5 V 45 81 mΩ VBOOT – VPH = 2.95 V 64 110 mΩ RLS Low-side switch resistance VVIN = 5 V 42 81 mΩ VVIN = 2.95 V 59 110 mΩ DC-DC ERROR AMPLIFIER IIN Input current VEN = 3 V 7 nA gM Error amplifier transconductance –2 µA ≤ ICOMP ≤ 2 µA, VCOMP = 1 V 245 µMho Error amplifier transconductance during slow-start operation –2 µA ≤ ICOMP ≤ 2 µA, VCOMP = 1 V, VVSENSE = 0.4 V 79 µMho ICOMP Error amplifier output current VCOMP = 1 V, 100-mV input overdrive ±20 µA COMP pin to ISWITCH gM 18 A/V DC-DC CURRENT LIMIT High-side current limit VVIN = 3 V 4.2 6.6 A DC-DC SOFT-START (SS PIN) SS pin charge current VSS = 0.4 V 2.2 µA SS pin to VSENSE pin matching VSS = 0.4 V 35 mV |
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