ltc3406ab Linear Technology Corporation, ltc3406ab Datasheet
ltc3406ab
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ltc3406ab Summary of contents
Page 1
... Supply current with no load is 200μA, dropping to <1μA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406AB ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery run time in portable systems ...
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... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC3406ABES5#PBF LTC3406ABES5#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...
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... V = 3.6V unless otherwise specifi ed CONDITIONS Note 4: The LTC3406AB is tested in a proprietary test mode that connects V to the output of the error amplifi er. FB Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 6: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125° ...
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... LTC3406AB TYPICAL PERFORMANCE CHARACTERISTICS (From Front Page Figure Except for the Resistive Divider Resistor Values) Oscillator Frequency vs Temperature 1. 3.6V IN 1.55 1.50 1.45 1.40 1.35 1.30 – 100 –25 TEMPERATURE (°C) 3406B G22 R vs Input Voltage DS(ON) 0.40 0.35 0.30 0.25 0.20 0.15 MAIN SWITCH SYNCHRONOUS SWITCH 0. INPUT VOLTAGE (V) 3406B G25 ...
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... TO 600mA LOAD V (Pin 4): Main Supply Pin. Must be closely decoupled to IN GND, Pin 2, with a 2.2μF or greater ceramic capacitor. V (Pin 5): Feedback Pin. Receives the feedback voltage FB from an external resistive divider across the output. LTC3406AB Load Step V OUT 200mV/DIV I L 500mA/DIV I LOAD 500mA/DIV ...
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... I voltage will ring. This is discontinuous mode operation, and is normal behavior for the switching regulator. At very light loads, the LTC3406AB will automatically skip pulses in pulse skipping mode operation to maintain output regulation. Refer to the LTC3406A data sheet if Burst Mode operation is preferred. ...
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... P-channel switch increases DS(ON) (see Typical Performance Characteristics). Therefore, the user should calculate the power dissipation when the LTC3406AB is used at 100% duty cycle with low input voltage (See Thermal Considerations in the Applications Information section). LTC3406AB Slope Compensation and Inductor Peak Current ...
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... The choice of which style inductor to use often depends more on the price vs size requirements and any radiated fi eld/EMI require- ments than on what the LTC3406AB requires to operate. Table 1 shows some typical surface mount inductors that work well in LTC3406AB applications. ...
Page 9
... ESR make them ideal for switching regulator applications. Because the LTC3406AB’s control loop does not depend on the output capacitor’s ESR for stable operation, ceramic capacitors can be used freely to achieve very low output ripple and small circuit size ...
Page 10
... In most applications the LTC3406AB does not dissipate much heat due to its high effi ciency. But, in applications 3406B F08 where the LTC3406AB is running at high ambient tem- perature with low supply voltage and high duty cycles, such as in dropout, the heat dissipated may exceed the maximum junction temperature of the part. If the junction temperature reaches approximately 150° ...
Page 11
... A R where T is the ambient temperature example, consider the LTC3406AB in dropout at an input voltage of 2.7V, a load current of 600mA and an ambient temperature of 70°C. From the typical per- formance graph of switch resistance, the R P-channel switch at 70°C is approximately 0.27Ω. There- fore, power dissipated by the part is: ...
Page 12
... LTC3406AB APPLICATIONS INFORMATION V OUT Design Example As a design example, assume the LTC3406AB is used in a single lithium-ion battery-powered cellular phone application. The V will be operating from a maximum of IN 4.2V down to about 2.7V. The load current requirement is a maximum of 0.6A but most of the time it will be in standby mode, requiring only 2mA. Effi ciency at both low and high load currents is important ...
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... 2.5V OUT I = 200mA TO 450mA LOAD Figure 5 shows the complete circuit along with its ef- fi ciency curve. (4) 2.5V, 600mA V OUT C ** OUT 10μF CER TAIYO YUDEN JMK212BJ475MG 100mV/DIV 500mA/DIV 500mA/DIV 3406B F10 Figure 5 LTC3406AB 100 V = 2.5V OUT 0.1 ...
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... LTC3406AB TYPICAL APPLICATIONS Single Li-Ion 1.2V/600mA Regulator for High Effi ciency and Small Footprint 2.2μ † 22pF C IN 4.7μF LTC3406AB CER 1 5 RUN V FB 301k GND 301k 2 3406AB TA09b Load Step V OUT 200mV/DIV I L 500mA/DIV I LOAD 500mA/DIV V = 3.6V 20μs/DIV ...
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... S5 Package 5-Lead Plastic SOT-23 (Reference LTC DWG # 05-08-1633 Rev B) 0.95 REF 1.22 REF 1.50 – 1.75 2.80 BSC 1.4 MIN (NOTE 4) PIN ONE 0.95 BSC 0.80 – 0.90 1.00 MAX 0.09 – 0.20 (NOTE 3) LTC3406AB 2.90 BSC (NOTE 4) 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.01 – 0.10 1.90 BSC S5 TSOT-23 0302 REV B 3406abfa 15 ...
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... LTC3406AB RELATED PARTS PART NUMBER DESCRIPTION LTC3406/LTC3406B 600mA (I ), 1.5MHz, Synchronous Step-Down OUT DC/DC Converters LTC3407/LTC3407-2 Dual 600mA/800mA (I OUT Synchronous Step-Down DC/DC Converters LTC3410/LTC3410B 300mA (I ), 2.25MHz, Synchronous Step-Down OUT DC/DC Converters LTC3411 1.25A (I ), 4MHz, Synchronous Step-Down OUT DC/DC Converter LTC3412 2. 4MHz, Synchronous Step-Down OUT DC/DC Converter LTC3440 ...