LTC3586-1 Linear Technology, LTC3586-1 Datasheet
LTC3586-1
Related parts for LTC3586-1
LTC3586-1 Summary of contents
Page 1
... OUT regulators can provide up to 400mA each, the buck-boost can deliver 1A, and the boost delivers at least 800mA. The LTC3586/LTC3586-1 are 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. ...
Page 2
... LTC3586/LTC3586-1 ABSOLUTE MAXIMUM RATINGS (Notes (Transient) t < 1ms, BUS Duty Cycle < 1% ..........................................– 0. (Static), IN1 IN2 IN3 IN4 BUS BAT, NTC, CHRG, FAULT LIM0 EN3, EN4, MODE, FB4, V .....................– 0. OUT4 FB1 ...............................................– 0. FB2 ...............................................– 0. FB3, V .......................................– ...
Page 3
... BUS VOUT BAT < V TRKL BAT < V TRKL BAT Rising Threshold Voltage Relative to V Timer Starts When BAT = V FLOAT BAT < V TRKL I = 5mA CHRG CHRG LTC3586/LTC3586 3.8V, IN1 IN2 IN3 IN4 OUT3 MIN TYP MAX 224 1133 2140 9.3 135 ...
Page 4
... LTC3586/LTC3586-1 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_CHG On-Resistance (Between V T Junction Temperature in Constant LIM Temperature Mode NTC V Cold Temperature Fault Threshold ...
Page 5
... V Output Voltage Adjust Range OUT4 V Overvoltage Shutdown OV4 ΔV Overvoltage Shutdown Hysteresis OV4 Burst Mode is a registered trademark of Linear Technology Corporation. LTC3586/LTC3586-1 l The denotes the specifi cations which apply over the full operating = 25° 5V, BAT = 3.8V BUS IN1 CONDITIONS I = 0μ ...
Page 6
... LTC3586/LTC3586-1 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are 5V 1k 3.01k, unless otherwise noted. OUT4 PROG CLPROG SYMBOL PARAMETER R PMOS R DS(ON)P4 DS(ON) R NMOS R DS(ON)N4 DS(ON) I PMOS Switch Leakage LEAK(P)4 I NMOS Switch Leakage LEAK(N Pull-Down in Shutdown VOUT4 OUT4 D Maximum Boost Duty Cycle ...
Page 7
... BATTERY VOLTAGE (V) 3586 G07 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 OUTPUT CURRENT (mA) 3586 G10 LTC3586/LTC3586 25°C unless otherwise noted) A Battery Drain Current vs Battery Voltage 0μA VOUT BUS (SUSPEND MODE CLPROG 0 3.9 4.2 2.7 3.0 3.3 3.6 BATTERY VOLTAGE (V) ...
Page 8
... LTC3586/LTC3586-1 TYPICAL PERFORMANCE CHARACTERISTICS Battery Charge Current vs Temperature 600 500 400 THERMAL REGULATION 300 200 100 PROG 10x MODE –40 – TEMPERATURE (°C) Oscillator Frequency vs Temperature 2.6 2.4 BAT = 3. BUS V BUS 2.2 BAT = BUS 2.0 BAT = 2. BUS www.DataSheet4U.com 1.8 –40 – ...
Page 9
... NMOS IN3 0.15 NMOS V = 3.6V IN3 NMOS V = 4.5V IN3 0.10 0.05 = 3.3V 0 1000 –55 –35 – 105 TEMPERATURE (°C) 3586 G28 LTC3586/LTC3586 25°C unless otherwise noted) A Switching Regulators 1, 2 Burst Mode Effi ciency 100 V = 2.5V OUT1 1. OUT1 1. 3.8V ...
Page 10
... LTC3586/LTC3586-1 TYPICAL PERFORMANCE CHARACTERISTICS Buck-Boost Regulator Burst Mode Operation Quiescent Current 14.0 13 4.5V IN3 13 IN1 V = 3.6V IN3 12.5 12.0 11.5 11.0 85 105 –55 –35 – TEMPERATURE (°C) Boost Effi ciency (V = 3.8V) IN4 100 OUT4 EFFICIENCY 60 50 POWER LOSS www.DataSheet4U.com 100 I (mA) ...
Page 11
... Switching Regulator 3. 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/LTC3586-1 . IN4 REGULATION MODE Buck Buck-Boost 0 ...
Page 12
... 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/LTC3586-1 will partition OUT the available power between the external load on V the internal battery charger. Priority is given to the external . A 1μF OUT load and any extra power is used to charge the battery ...
Page 13
... FB4 10 2.25MHz PowerPath SWITCHING REGULATOR SUSPEND LDO 500μA – – 1.188V 3.6V FAULT LOGIC MASTER LOGIC EN4 800mA 2.25MHz (BOOST) SWITCHING REGULATOR 4 LTC3586/LTC3586 LDO3V3 3 3.3V LDO 34 V OUT + 31 GATE IDEAL CC/CV – CHARGER – + 0.3V 15mV + – 32 BAT 29 PROG 27 V IN1 EN1 26 SW1 400mA 2 ...
Page 14
... USB power. Because power is conserved, the LTC3586/LTC3586-1 allow the load current on V exceed the current drawn by the USB port without exceed- ing the USB load specifications. ...
Page 15
... OUT as OUT When an external P-channel MOSFET transistor is present, the GATE pin of the LTC3586/LTC3586-1 drive its gate for automatic ideal diode control. The source of the external P-channel MOSFET should be connected to V drain should be connected to BAT. Capable of driving a 1nF load, the GATE pin can control an external P-channel MOSFET transistor having an on-resistance of 40mΩ ...
Page 16
... LTC3586/LTC3586-1 OPERATION Suspend LDO If the LTC3586/LTC3586-1 are configured for USB suspend mode, the switching regulator is disabled and the suspend LDO provides power to the V OUT power available This LDO will prevent the bat- BUS tery from running down when the portable product has access to a suspended USB port ...
Page 17
... 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. UVLO BUS is removed and then BUS LTC3586/LTC3586-1 1022 V 1022 CHG ...
Page 18
... V BUS tor with a value equal to the value of the chosen NTC thermistor at 25°C (R25). A 100k thermistor is recom- mended since thermistor current is not measured by the LTC3586/LTC3586-1 and will have to be budgeted for USB DUTY CYCLES compliance. 100% 0% The LTC3586/LTC3586-1 will pause charging when the 6 ...
Page 19
... To suit a variety of applications, selectable mode functions can be used to trade-off noise for efficiency. Two modes are avail- able to control the operation of the LTC3586/LTC3586-1’s buck regulators. At moderate to heavy loads, the pulse- skip mode provides the least noise switching solution. At lighter loads, Burst Mode operation may be selected ...
Page 20
... LTC3586/LTC3586-1 OPERATION CHARGE AT 100V/R (C/10 RATE) PROG RUN EVENT TIMER NO TIMER > 30 MINUTES www.DataSheet4U.com YES INHIBIT CHARGING INDICATE BATTERY FAULT AT CHRG BAT > 2.85V YES 20 POWER ON CLEAR EVENT TIMER ASSERT CHRG LOW YES NTC OUT OF RANGE NO BAT < 2.85V BAT > 4.15V BATTERY STATE 2.85V < BAT < 4.15V ...
Page 21
... Experimentation with capacitor sizes between 2pF and 22pF may yield improved transient response. Buck Regulator Operating Modes The LTC3586/LTC3586-1’s buck regulators include two possible operating 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 ...
Page 22
... If the FB3 node were inadvertently shorted to ground, then the output would increase indefi nitely with the maximum current that could be sourced from V LTC3586-1 protect against this by shutting off the input PMOS if the output voltage exceeds 5.6V (typical). Low Output Voltage Operation When the output voltage is below 2 ...
Page 23
... Burst Mode opera- tion and PWM mode. SYNCHRONOUS BOOST DC/DC SWITCHING REGULATOR The LTC3586/LTC3586-1 contain 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 ...
Page 24
... If the FB4 node were inadvertently shorted to ground, then pin. OUT4 the boost converter output would increase indefi nitely with the maximum current that could be sourced from V LTC3586/LTC3586-1 protects against this by shutting off the main switch if the output voltage exceeds 5.3V. Operation OUT ). The maximum ...
Page 25
... Because the input voltage range and output voltage range of the power path switching regulator are both fairly nar- row, the LTC3586/LTC3586-1 are designed for a specifi c inductance value of 3.3μH. Some inductors which may be suitable for this application are listed in Table 4. ...
Page 26
... Primary thermistor bias resistor NOM (see Figure 6a Optional temperature range adjustment resistor (see Figure 6b) The trip points for the LTC3586/LTC3586-1’s temperature qualification are internally programmed at 0.349 • V the hot threshold and 0.765 • V Therefore, the hot trip point is set when: R ...
Page 27
... HOT = • 714 . . • R – r • NOM HOT 3 266 0 4368 . – • 100 k 104 2 2 714 . V LTC3586/LTC3586-1 BUS NTC BLOCK 0.765 • V BUS R – NOM 105k NTC + 5 R1 – 12.7k 0.349 • V BUS + R NTC T 100k + – 0.017 • V BUS (6b) . ...
Page 28
... USB voltage. To prevent excessive voltage from damaging the LTC3586/LTC3586-1 during a hot insertion best to have a low voltage coefficient capacitor at the V the LTC3586/LTC3586-1. This is achievable by selecting an MLCC capacitor that has a higher voltage rating than that required for the application. For example, a 16V, X5R, 10μ ...
Page 29
... DCR losses, and will not give the best efficiency. 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/LTC3586-1 require to operate. The inductor value also has an effect on Burst Mode operations ...
Page 30
... V is 0.8V. See Figure FB3 30 Closing the Feedback Loop The LTC3586/LTC3586-1 incorporate voltage mode PWM control. The control to output gain varies with operation MANUFACTURER region (buck, boost, buck-boost), but is usually no greater Coilcraft than 20. The output fi lter exhibits a double pole response www ...
Page 31
... 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/LTC3586-1 : 105k : 22μF : 2.2μH ) OUT4 ) ...
Page 32
... C PL 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/LTC3586-1 packages 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 ...
Page 33
... IN1 IN2 IN3 OUT3 the LTC3586/LTC3586-1, tend to find their way along the ground plane in a myriad of paths ranging from directly back to a mirror path beneath the incident path on the top of the board. If there are slits or cuts in the ground plane due to other traces on that layer, the current will be forced to go around the slits. If high frequency currents are not allowed to fl ...
Page 34
... V OUT3 10pF 330pF 15k LDO3V3 11 FB3 1μF 19 SWCD3 10k L2 2.2μ FAULT SWAB3 14 LIM IN3 L3 LTC3586/LTC3586-1 4.7μ SW2 MODE 23 FB2 18, 20, 21 IN2 L4 4.7μH 26 SW1 28 FB1 27 V IN1 22 V IN4 8 SW4 OUT4 10 ...
Page 35
... LTC DWG # 05-08-1712 Rev B) 2.65 0.05 4.65 0.05 0.20 0.05 0.40 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/LTC3586-1 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 0.10 (UFE38) QFN 0708 REV 0.115 ...
Page 36
... LTC3586/LTC3586-1 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 ...