ltc3586 Linear Technology Corporation, ltc3586 Datasheet
ltc3586
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ltc3586 Summary of contents
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... OUT tors can provide up to 400mA each, the buck-boost can deliver 1A, and the boost delivers at least 800mA. The LTC3586 is available in a low-profi le (0.75mm) 38-pin 4mm × 6mm QFN package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath and Bat-Track are registered trademarks of Linear Technology Corporation. ...
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... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC3586EUFE#PBF LTC3586EUFE#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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... Diode Mode) BUS VOUT BAT < V TRKL BAT < V TRKL BAT Rising Threshold Voltage Relative to V FLOAT Timer Starts When BAT = V FLOAT BAT < V TRKL I = 5mA CHRG CHRG LTC3586 = 3.8V, IN2 IN3 IN4 OUT3 MIN TYP MAX UNITS 224 mA/mA 1133 mA/mA 2140 mA/mA 9.3 ...
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... LTC3586 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are 5V 1k 3.01k, unless otherwise noted. OUT4 PROG CLPROG SYMBOL PARAMETER R Battery Charger Power FET On- ON_CHG Resistance (Between V OUT T Junction Temperature in Constant LIM Temperature Mode NTC V Cold Temperature Fault Threshold ...
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... V ≤ 5.5V IN3 OUT3 (Note 8) Switches A, D Switches B, C Switches A, D Switches B, C PWM Mode PWM Mode FB4 = 0V 0μA VOUT4 Shutdown OUT4 FB4 = 0V (Note 5) LTC3586 = 3.8V, IN2 IN3 IN4 OUT3 MIN TYP MAX UNITS 225 μ μA 1 μ ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3586E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls ...
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... BATTERY VOLTAGE (V) V Current vs Output Current in BUS Suspend 0 BUS BAT = 3. 3.01k CLPROG 0.4 0.3 0.2 0.1 0 0.1 0.3 0.5 0 0.2 0.4 OUTPUT CURRENT (mA) LTC3586 (T = 25°C unless otherwise noted) A Battery Drain Current vs Battery Voltage 0μA VOUT V BUS BUS (SUSPEND MODE CLPROG 0 4.2 2.7 3.0 3.3 3.6 BATTERY VOLTAGE (V) 3586 G05 ...
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... LTC3586 TYPICAL PERFORMANCE CHARACTERISTICS Battery Charge Current vs Temperature 600 500 400 THERMAL REGULATION 300 200 100 PROG 10x MODE –40 – 100 TEMPERATURE (°C) 3586 G13 Oscillator Frequency vs Temperature 2.6 2.4 BAT = 3. BUS BUS 2.2 BAT = BUS 2.0 BAT = 2.7V ...
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... IN3 0.20 NMOS IN3 0.15 NMOS V = 3.6V IN3 NMOS V = 4.5V IN3 0.10 0.05 0 –55 –35 – 105 TEMPERATURE (°C) 3586 G29 LTC3586 (T = 25°C unless otherwise noted) A Switching Regulators 1, 2 Burst Mode Effi ciency 100 V = 2.5V OUT1 OUT1 1.8V OUT1 3.8V ...
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... LTC3586 TYPICAL PERFORMANCE CHARACTERISTICS Buck-Boost Regulator Burst Mode Operation Quiescent Current 14.0 13 4.5V IN3 13 IN1 12 3.6V IN3 12.0 11.5 11.0 85 105 –55 –35 – TEMPERATURE (°C) 3586 G31 Boost Effi ciency (V = 3.8V) IN4 100 90 EFFICIENCY POWER LOSS OUT4 100 1000 ...
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... EN3 (Pin 18): Digital input. This input enables the buck-boost switching regulator 3. SWCD3 (Pin 19): Switch Node for (Buck-Boost) Switch- ing Regulator 3 Connected to Internal Power Switches C and D. An external inductor connects between this node and SWAB3. LTC3586 . REGULATION MODE Buck Buck-Boost Pulse-Skip PWM ...
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... Output Voltage of the Switching OUT PowerPath Controller and Input Voltage of the Battery Charger. The majority of the portable product should be powered from V . The LTC3586 will partition the available OUT power between the external load on V battery charger. Priority is given to the external load and . A 1μF OUT any extra power is used to charge the battery ...
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... PowerPath SWITCHING REGULATOR SUSPEND LDO 500μA – – + CHARGER + + 0.3V + – 1.188V 3.6V EN1 EN2 MASTER LOGIC EN3 EN4 800mA 2.25MHz (BOOST) SWITCHING REGULATOR 4 LTC3586 SW 37 LDO3V3 3 3.3V LDO V 34 OUT + 31 GATE IDEAL CC/CV – – + 15mV BAT 32 29 PROG 27 V IN1 26 SW1 400mA 2 ...
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... LTC3586 OPERATION Introduction The LTC3586 is a highly integrated power management IC which includes a high efficiency switch mode PowerPath controller, a battery charger, an ideal diode, an always-on LDO, two 400mA buck switching regulators buck- boost switching regulator, and an 800mA boost switch- ing regulator. All of the regulators can be independently controlled via ENABLE pins. Designed specifi ...
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... Figure 1 shows the range of possible voltages function of battery voltage. Ideal Diode from BAT to V OUT The LTC3586 has an internal ideal diode as well as a con- troller for an optional external ideal diode. The ideal diode controller is always on and will respond quickly whenever V drops below BAT ...
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... Always-On Supply The LTC3586 includes a low quiescent current low dropout regulator that is always powered. This LDO can be used to provide power to a system pushbutton controller, standby microcontroller or real time clock. Designed to deliver up to 20mA, the always-on LDO requires at least a 1μ ...
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... The signal at the CHRG pin can be easily recognized as one of the above four states by either a human or a mi- croprocessor. An open-drain output, the CHRG pin can drive an indicator LED through a current limiting resistor for human interfacing or simply a pull-up resistor for microprocessor interfacing. LTC3586 , will BAT . OUT 3586f ...
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... LED while a microprocessor would be able to decode either the 12.5% or 87.5% duty cycles as a bad battery fault. 18 Note that the LTC3586 is a three terminal PowerPath prod- uct where system load is always prioritized over battery charging. Due to excessive system load, there may not be sufficient power to charge the battery beyond the trickle charge threshold voltage within the bad battery timeout period ...
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... LTC3586 or external components. The benefit of the LTC3586 thermal regulation loop is that charge current can be set according to actual conditions rather than worst-case conditions with the assurance that the battery charger will automatically reduce the current in worst-case conditions ...
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... LTC3586 OPERATION BAT < 2.85V CHARGE AT 100V/R (C/10 RATE) PROG RUN EVENT TIMER NO TIMER > 30 MINUTES YES INHIBIT CHARGING INDICATE BATTERY FAULT AT CHRG NO BAT > 2.85V YES 20 POWER ON CLEAR EVENT TIMER ASSERT CHRG LOW YES NTC OUT OF RANGE NO BAT > 4.15V BATTERY STATE 2.85V < BAT < 4.15V ...
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... Experimentation with capacitor sizes between 2pF and 22pF may yield improved transient response. Buck Regulator Operating Modes The LTC3586’s buck regulators include two possible oper- ating modes to meet the noise/ power needs of a variety of applications. In pulse skip mode, an internal latch is set at the start of every cycle which turns on the main P-channel MOSFET switch ...
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... The converter is enabled by pulling EN3 high. To suit a variety of applications, a selectable mode function allows the user to trade-off noise for effi ciency. Two modes are available to control the operation of the LTC3586’s buck- boost regulator. At moderate to heavy loads, the constant frequency PWM mode provides the least noise switching solution ...
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... Burst Mode opera- tion and PWM mode. SYNCHRONOUS BOOST DC/DC SWITCHING REGULATOR The LTC3586 contains a 2.25MHz constant-frequency current-mode synchronous boost switching regulator with true output disconnect feature. The regulator provides at least 800mA of output load current and the output voltage can be programmed maximum of 5V ...
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... If the FB4 node were inadvertently shorted to ground, then the boost converter output would increase indefi nitely with pin. OUT4 the maximum current that could be sourced from V The LTC3586 protects against this by shutting off the main switch if the output voltage exceeds 5.3V. Operation statically on its gate. This ensures IN4 ) ...
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... Choosing the PowerPath Inductor Because the input voltage range and output voltage range of the power path switching regulator are both fairly nar- row, the LTC3586 was designed for a specifi c inductance value of 3.3μH. Some inductors which may be suitable for this application are listed in Table 4. ...
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... Primary thermistor bias resistor NOM (see Figure 6a Optional temperature range adjustment resistor (see Figure 6b) The trip points for the LTC3586’s temperature qualification are internally programmed at 0.349 • V threshold and 0.765 • V fore, the hot trip point is set when: R ...
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... NOM – r COLD HOT • 714 . • R – r • NOM HOT . – • 100 k 104 714 . V LTC3586 BUS NTC BLOCK 0.765 • V BUS – TOO_COLD + – TOO_HOT 0.349 • V BUS + + NTC_ENABLE – 0.017 • V BUS (6b) 3586 F06b 3586f 27 ...
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... USB voltage. To prevent excessive voltage from damag- ing the LTC3586 during a hot insertion best to have a low voltage coefficient capacitor at the V LTC3586. This is achievable by selecting an MLCC capaci- tor that has a higher voltage rating than that required for the application. For example, a 16V, X5R, 10μ ...
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... The choice of which style inductor to use often depends more on the price vs size, performance and any radiated EMI requirements than on what the LTC3586 requires to operate. The inductor value also has an effect on Burst Mode operations. Lower inductor values will cause the Burst Mode switching frequencies to increase ...
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... V is 0.8V. See Figure FB3 30 Closing the Feedback Loop The LTC3586 incorporates voltage mode PWM control. The control to output gain varies with operation region (buck, MANUFACTURER boost, buck-boost), but is usually no greater than 20. The Coilcraft output fi lter exhibits a double pole response given by: www ...
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... At least 10μF of output capacitance at the rated output voltage is required to ensure stability of the boost converter output voltage over the entire temperature and load range. Refer to Table 6 for recommended ceramic capacitor manufacturers. LTC3586 ) OUT4 ). Only IN4 3586f ...
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... Recommended values for C in the range of 2pF to 10pF. Printed Circuit Board Layout Considerations In order to be able to deliver maximum current under all conditions critical that the Exposed Pad on the backside of the LTC3586 package be soldered to the PC board ground. Failure to make thermal contact between R1 C OUT the Exposed Pad on the backside of the package and the copper board will result in higher thermal resistances ...
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... APPLICATIONS INFORMATION Furthermore, due to its high frequency switching circuitry imperative that the input capacitors, inductors and output capacitors be as close to the LTC3586 as possible and that there be an unbroken ground plane under the LTC3586 and all of its external high frequency components. ...
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... V OUT3 10pF 330pF 15k 12 324k LDO3V3 11 FB3 19 SWCD3 105k 10k L2 2.2μ FAULT SWAB3 LIM IN3 L3 LTC3586 4.7μ SW2 MODE 1.02M 23 FB2 806k IN2 L4 4.7μH 26 SW1 806k 28 FB1 806k 27 V IN1 22 V IN4 L5 2.2μH 8 ...
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... BSC 4.40 REF 5.10 ± 0.05 6.50 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED R = 0.10 0.75 ± 0.05 TYP 4.40 REF 0.200 REF 0.00 – 0.05 LTC3586 0.70 ±0.05 PACKAGE OUTLINE PIN 1 NOTCH R = 0.30 OR 0.35 × 45° CHAMFER 2.40 REF 37 38 0.40 ± 0. 4.65 ± 0.10 2.65 ± ...
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... LTC3586 RELATED PARTS PART NUMBER DESCRIPTION LTC3455 Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger LTC3456 2-Cell, Multi-Output DC/DC Converter with USB Power Manager LTC3552 Standalone Linear Li-Ion Battery Charger with Adjustable Output Dual Synchronous Buck Converter 2 LTC3555 I C Controlled High Effi ciency USB ...