LTC1872ES6 LINER [Linear Technology], LTC1872ES6 Datasheet
LTC1872ES6
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LTC1872ES6 Summary of contents
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FEATURES High Efficiency: Over 90% High Output Currents Easily Achieved Wide V Range: 2. Limited Only by External Components OUT Constant Frequency 550kHz Operation TM Burst Mode Operation at Light Load Current Mode Operation for Excellent ...
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... Note 6: Guaranteed by design at duty cycle = 30%. Peak current sense voltage is V and power increases due to slope compensation as shown in Figure INFORMATION ORDER PART NUMBER TOP VIEW LTC1872ES6 6 NGATE – SENSE S6 PART MARKING S6 PACKAGE 6-LEAD PLASTIC SOT-23 LTMK = 150 C, ...
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W U TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage vs Temperature 825 V = 4.2V IN 820 815 810 805 800 795 790 785 780 775 –55 –35 – 105 125 TEMPERATURE ( C) 1872 G01 Maximum ...
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LTC1872 U U FUNCTIONAL DIAGRA – V SENSE – OSC FREQ FOLDBACK 0.3V – GND 2 U OPERATIO (Refer to Functional Diagram) Main Control Loop The LTC1872 is a constant frequency current ...
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U OPERATIO (Refer to Functional Diagram) Comparator OVP guards against transient overshoots > 7.5% by turning off the external N-channel power MOSFET and keeping it off until the fault is removed. Burst Mode Operation The LTC1872 enters Burst Mode operation ...
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LTC1872 U U APPLICATIONS INFORMATION The basic LTC1872 application circuit is shown in Figure 1. External component selection is driven by the load requirement and begins with the selection of L1 and R (= R1). Next, the power MOSFET and ...
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U U APPLICATIONS INFORMATION Inductor Selection When selecting the inductor, keep in mind that inductor saturation current has to be greater than the current limit set by the current sense resistor. Also, keep in mind that the DC resistance of ...
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LTC1872 U U APPLICATIONS INFORMATION where f is the operating frequency, C capacitance and I is the ripple current in the induc- RIPPLE tor. Manufacturers such as Nichicon, United Chemicon and Sanyo should be considered for high performance through- hole ...
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U U APPLICATIONS INFORMATION For most applications, an 80k resistor is suggested for R1. To prevent stray pickup, locate resistors R1 and R2 close to LTC1872. Efficiency Considerations The efficiency of a switching regulator is equal to the output power ...
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LTC1872 U U APPLICATIONS INFORMATION PC Board Layout Checklist When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the LTC1872. These items are illustrated graphically in the layout diagram in Figure ...
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U TYPICAL APPLICATIO 10k 220pF C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT C2: AVX TPSE476M016R0150 D1: IR10BQ015 CELLS 2. 10k AA 220pF AA C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT C2: AVX TPSD156M035R0300 D0: MOTOROLA MBR0540 ...
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LTC1872 U TYPICAL APPLICATIO LTC1872 – 2.5V to 3.3V/0.5A Boost Converter /RUN LTC1872 10k 2 4 – GND SENSE 3 6 220pF V NGATE 0.1 F 100 F CERAMIC 10V V ...