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LTC3586-1 Datasheet(PDF) 11 Page - Linear Technology |
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LTC3586-1 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 36 page  LTC3586/LTC3586-1 11 3586fa PIN FUNCTIONS ILIM0, ILIM1 (Pins 1, 2): Logic Inputs. ILIM0 and ILIM1 control the current limit of the PowerPath switching regulator. See Table 1. SW4 (Pin 8): Switch Node for the (Boost) Switching Regulator 4. An external inductor connects between this pin and VIN4. MODE (Pin 9): Digital Input. The MODE pin controls dif- ferent modes of operation for the switching regulators according to Table 2. Table 1. USB Current Limit Settings (ILIM1)(ILIM0) USB SETTING 0 0 1x Mode (USB 100mA Limit) 0 1 10x Mode (Wall 1A Limit) 1 0 Suspend 1 1 5x Mode (USB 500mA Limit) LDO3V3 (Pin 3): 3.3V LDO Output Pin. This pin provides a regulated always-on 3.3V supply voltage. LDO3V3 gets its power from VOUT. It may be used for light loads such as a watch dog microprocessor or real time clock. A 1μF capacitor is required from LDO3V3 to ground. If the LDO3V3 output is not used it should be disabled by connecting it to VOUT. CLPROG (Pin 4): USB Current Limit Program and Moni- tor Pin. A resistor from CLPROG to ground determines the upper limit of the current drawn from the VBUS pin. A fraction of the VBUS current is sent to the CLPROG pin when the synchronous switch of the PowerPath switching regulator is on. The switching regulator delivers power until the CLPROG pin reaches 1.188V. Several VBUS current limit settings are available via user input which will typically correspond to the 500mA and 100mA USB specifications. A multilayer ceramic averaging capacitor is required at CLPROG for filtering. NTC (Pin 5): Input to the Thermistor Monitoring Circuits. The NTC pin connects to a battery’s thermistor to deter- mine if the battery is too hot or too cold to charge. If the battery’s temperature is out of range, charging is paused until it re-enters the valid range. A low drift bias resistor is required from VBUS to NTC and a thermistor is required from NTC to ground. If the NTC function is not desired, the NTC pin should be grounded. VOUT4 (Pins 6, 7): Power Output for the (Boost) Switching Regulator 4. A 10μF MLCC capacitor should be placed as close to the pins as possible. Table 2. Switching Regulators Mode REGULATION MODE Mode Buck Buck-Boost Boost 0 Pulse-Skip PWM Pulse-Skip 1 Burst Burst Pulse-Skip FB4 (Pin 10): Feedback Input for the (Boost) Switching Regulator 4. When the control loop is complete, the volt- age on this pin servos to 0.8V. FB3 (Pin 11): Feedback Input for (Buck-Boost) Switching Regulator 3. When regulator 3’s control loop is complete, this pin servos to 0.8V. VC3(Pin12):OutputoftheErrorAmplifierandVoltageCom- pensation Node for (Buck-Boost) Switching Regulator 3. External Type I or Type III compensation (to FB3) connects to this pin. See the Applications Information section for selecting buck-boost compensation components. SWAB3 (Pin 13): Switch Node for (Buck-Boost) Switch- ing Regulator 3. Connected to Internal Power Switches A and B. An external inductor connects between this node and SWCD3. VIN3(Pins14,15):PowerInputfor(Buck-Boost)Switching Regulator 3. These pins will generally be connected to VOUT. A 1μF MLCC capacitor is recommended on these pins. VOUT3 (Pins 16, 17): Output Voltage for (Buck-Boost) 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. |
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