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LM3253 bảng dữ liệu(PDF) 6 Page - Texas Instruments |
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LM3253 bảng dữ liệu(HTML) 6 Page - Texas Instruments |
6 / 25 page LM3253 SNVS791Q – FEBRUARY 2012 – REVISED MAY 2013 www.ti.com ELECTRICAL CHARACTERISTICS (1) (2) (3) Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature range ( −30°C ≤ TA = TJ ≤ +90°C). Unless otherwise noted, all specifications apply to the Typical System Application Diagram with: PVIN = VDD = EN = 3.8V, BP = 0V. Symbol Parameter Conditions Min Typ Max Units Feedback voltage at low VFB, LOW VCON = 0.16V, MODE = LOW(3) 0.3500 0.400 0.450 V setting Feedback voltage at high VCON = 1.4V, VIN = 3.9V, VFB, HIGH 3.492 3.6 3.708 V setting MODE = LOW(3) ISHDN Shutdown supply current EN = SW = VCON = 0V(4) 0.02 4 µA No switching(5) Iq_PFM DC bias current into VDD 260 310 MODE = HIGH µA No Switching (5) Iq_PWM DC bias current into VDD 975 1100 MODE = LOW Positive transient peak current ILIM,PFET, Transient VCON = 0.6V(6) 2.3 2.5 A limit ILIM,PFET,Steady Positive steady state peak VCON = 0.6V(6) 1.78 1.9 2.09 A State current limit Positive active current assist VCON = 0.6V, ILIM, P_ACB 1.40 1.70 2.00 A peak current limit VACB = 2.8V(6) NFET Switch negative peak ILIM, NFET VCON = 1.0V(6) −1.69 −1.50 −1.31 A current limit Average internal oscillator FOSC VCON = 1.0V 2.43 2.70 2.97 MHz frequency VIH Logic HIGH input threshold BP, EN, MODE 1.2 V VIL Logic LOW input threshold BP, EN, MODE 0.5 IEN EN pin pulldown current EN = 3.6V 0 5 10 IIN Pin input current BP, MODE −1 1 µA IVCON VCON pin leakage current VCON = 1.0V −1 1 Gain VCON to VOUT Gain 0.16V ≤ VCON ≤ 1.44V(6) 2.5 V/V (1) All voltages are with respect to the potential at the GND pins. The LM3253 is designed for mobile phone applications where turn-on after power-up is controlled by the system controller and where requirements for a small package size overrule increased die size for internal Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin LOW until the input voltage exceeds 2.7V. (2) Min and Max limits are specified by design, test, or statistical analysis. (3) The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = VIN = 3.8V. For performance over the input voltage range and closed-loop results, refer to the datasheet curves. (4) Shutdown current includes leakage current of PFET. (5) Iq specified here is when the part is not switching. For operating input current at no load, refer to datasheet curves. (6) Current limit is built-in, fixed, and not adjustable. 6 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Product Folder Links: LM3253 |
Số phần tương tự - LM3253_15 |
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Mô tả tương tự - LM3253_15 |
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