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LM2594N-3.3/NOPB Datasheet(PDF) 6 Page - Texas Instruments |
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LM2594N-3.3/NOPB Datasheet(HTML) 6 Page - Texas Instruments |
6 / 41 page 6 LM2594, LM2594HV SNVS118D – DECEMBER 1999 – REVISED MAY 2016 www.ti.com Product Folder Links: LM2594 LM2594HV Submit Documentation Feedback Copyright © 1999–2016, Texas Instruments Incorporated (1) Typical numbers are at 25°C and represent the most likely norm. (2) All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the LM2594/LM2594HV is used as shown in the Figure 35 test circuit, system performance is as shown in the system parameters. 7.8 Electrical Characteristics – Adjustable Specifications are for TJ = 25°C (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP(1) MAX(2) UNIT SYSTEM PARAMETERS(3) (see Figure 35 for test circuit) VFB Feedback voltage 4.5 V ≤ VIN ≤ VINmax, 0.1 A ≤ ILOAD ≤ 0.5 A, VOUT programmed for 3 V, Circuit of Figure 35 TJ = 25°C 1.193 1.23 1.267 V Over full operating temperature range 1.18 1.28 η Efficiency VIN = 12 V, ILOAD = 0.5 A 80% (1) Typical numbers are at 25°C and represent the most likely norm. (2) All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (3) The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current overload. (4) No diode, inductor or capacitor connected to output pin. (5) Feedback pin removed from output and connected to 0 V to force the output transistor switch ON. (6) Feedback pin removed from output and connected to 12 V for the 3.3-V, 5-V, and the adjustable version, and 15 V for the 12-V version, to force the output transistor switch OFF. (7) VIN = 40 V for the LM2594 and 60 V for the LM2594HV. 7.9 Electrical Characteristics – All Output Voltage Versions Specifications are for TJ = 25°C, VIN = 12 V for the 3.3-V, 5-V, and adjustable version, and VIN = 24 V for the 12-V version, ILOAD = 100 mA (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP(1) MAX(2) UNIT DEVICE PARAMETERS Ib Feedback bias current Adjustable version only, VFB = 1.3 V TJ = 25°C 10 50 nA Over full operating temperature range 100 fO Oscillator frequency See(3) TJ = 25°C 127 150 173 kHz Over full operating temperature range 110 173 VSAT Saturation voltage IOUT = 0.5 A (4) (5) TJ = 25°C 0.9 1.1 V Over full operating temperature range 1.2 DC Max duty cycle (ON) See(5) 100% Min duty cycle (OFF) See(6) 0% ICL Current limit Peak current(4)(5) TJ = 25°C 0.65 0.8 1.3 A over full operating temperature range 0.58 1.4 IL Output leakage current Output = 0 V(4)(6)(7) Output = −1 V 50 μA 2 15 mA IQ Quiescent current See(6) 5 10 mA ISTBY Standby quiescent current ON/OFF pin = 5 V (OFF)(7) 85 μA LM2594 TJ = 25°C 200 μA Over full operating temperature range 250 LM2594HV TJ = 25°C 140 250 μA Over full operating temperature range 300 ON/OFF CONTROL (see Figure 35 for test circuit) ON/OFF pin logic input 1.3 V VIH Threshold voltage Low (regulator ON), over full operating temperature range 0.6 V VIL High (regulator OFF), over full operating temperature range 2 V IH ON/OFF pin input current VLOGIC = 2.5 V (regulator OFF) 5 15 μA IL VLOGIC = 0.5 V (regulator ON) 0.02 5 μA |
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