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TPS54122QRHLRQ1 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS54122QRHLRQ1 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 40 page  TPS54122-Q1 www.ti.com SBVS253A – JANUARY 2015 – REVISED MAY 2015 6.4 Thermal Information TPS54122-Q1 THERMAL METRIC(1) RHL (VQFN) UNIT 24 PINS RθJA Junction-to-ambient thermal resistance 34.9 RθJC(top) Junction-to-case(top) thermal resistance 39.0 RθJB Junction-to-board thermal resistance 13.5 °C/W ψJT Junction-to-top characterization parameter 0.3 ψJB Junction-to-board characterization parameter 13.6 RθJC(bot) Junction-to-case(bottom) thermal resistance 1.4 (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. 6.5 Electrical Characteristics At TJ , TA= –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) VIN pin input voltage range 2.95 6 V VVIN 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 VEN = 1.13 V 1.2 µA IEN EN pin input current 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 VBOOT – VPH = 5 V 45 81 m Ω RHS High-side switch resistance VBOOT – VPH = 2.95 V 64 110 m Ω VVIN = 5 V 42 81 m Ω RLS Low-side switch resistance VVIN = 2.95 V 59 110 m Ω DC-DC ERROR AMPLIFIER IIN Input current VEN = 3 V 7 nA Error amplifier transconductance –2 µA ≤ ICOMP ≤ 2 µA, VCOMP = 1 V 245 µMho gM Error amplifier transconductance during –2 µA ≤ ICOMP ≤ 2 µA, VCOMP = 1 V, 79 µMho slow-start operation VVSENSE = 0.4 V 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 (1) DC-DC_OUT refers to the regulated output voltage of the switching regulator (see Figure 27). Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: TPS54122-Q1 |
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