DEMO MANUAL DC1607A LTC3675EUFF 7-Channel Configurable High Power PMIC DESCRIPTION WARNING! Do not look directly at operating LED This circuit produces light that can damage eyes Demonstration circuit 1607 is a multioutput power supply with a pushbutton controller and a dual string LED driver featuring the LTC®3675. The LTC3675 has four synchronous buck regulators, a buck-boost regulator, a boost regulator, plus an always-on LDO regulator. The buck regulators may be combined together to create a higher power buck regulator with a single inductor. The LED boost driver can drive two strings of up to 10 LEDs at up to 25mA each, two strings of 5 LEDs at up to 50mA each, or be configured as a fixed high voltage boost regulator. The input range of the LTC3675 is ideal for single cell Li-Ion/Polymer battery applications. The switching regulator settings such as enables, feedback voltages, operating modes and other functions, plus the LED current and LED current gradation can be controlled via I2C. The buck regulators and buck-boost regulator can also be enabled via external enable pins. PERFORMANCE SUMMARY PARAMETER After the first regulator is enabled, the remaining enable pins use a precision threshold to allow hardwired power up sequences. The LTC3675 also has some unique features such as programmable input undervoltage (UV) and overtemperature (OT) warnings to allow the user to better manage power and thermal budgets during critical circumstances. The LTC3675 has two outputs which may be programmed to alert the user when certain events have occurred such as a low regulator output, input UV or an OT event. Two status registers can be read via I2C that indicate which regulators are in regulation and if a UV or OT warning occurred. The command registers which are used to control the switching regulators and program the special functions can also be read back via I2C to assure the correct data was received. Refer to the LTC3675 data sheet for more details on the electrical and timing specifications. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C. CONDITIONS MIN TYP MAX UNITS Input Supply Range (VIN) 2.7 5.5 V DVCC Operating Voltage 1.6 5.5 V DVCC UVLO (VDVCC,UVLO) 1.0 V LDO_OUT 0mA to 25mA 1.2 V VOUT1 0A to 1A 1.2 V VOUT2 0A to 1A (VIN = >3.0V) 2.5 V VOUT3 0mA to 500mA 1.8 V VOUT4 0mA to 500mA 1.6 V VOUT5 0A to 1A (VIN = >3.0V) 5.0 V VOUT6 0A to 1A (VIN > 3.1V) 3.3 V Full-Scale LED Current 2 × Full-Scale Mode 1 × Full-Scale Mode 50 25 mA mA dc1607af 1 DEMO MANUAL DC1607A QUICK START PROCEDURE Demo Circuit 1607 is designed to be used for single cell Li-Ion/Polymer battery applications. Demo Circuit 1607 utilizes the DC590B, USB to I2C interface board, to control the switching regulators and the LED boost driver functions, program the undervoltage (UV) and overtemperature (OT) warnings, and to read back the contents of the command and status registers. NOTE: If the READ text boxes do not match the WRITE text boxes then the command registers were not read correctly. This occurs when the power is not present, when DVCC is missing, or when the DC590B board is not responding. Verify that the input power and DVCC are applied. If the DC590B board is not responding, close the QuikEval.exe program, momentarily unplug the USB cable from the DC590B board, then run the QuikEval.exe program. The following pop-up warning may also appear at this time. This box appears when the regulators and LED driver are disabled and the READ text boxes do not match the WRITE text boxes. The DC1607 is easy to set up to evaluate the performance of the LTC3675. Refer to Figure 3 and Figure 4 for proper measurement equipment setup and follow the evaluation procedure below using the DC590B board. NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or VOUT and GND terminals. See Figure 4 for proper scope probe technique. 1. Refer to the DC590B Quick Start Guide for QuikEval™ setup and software installation details. 2. Set the VCCIO jumper, JP6, on the DC590B board to the 3.3V position. NOTE: The DVCC voltage level may be selected on the DC590B. This is done by setting the VCCIO jumper, JP6, on the DC590B board to one of the following settings: 3.3V, 5V, removed for 2.7V or set to external if an external supply is desired to be used. 3. Make sure the USB cable is connected between the computer and the DC590B controller board. 4. Set the JP1-JP5 jumpers on the DC1607 board to the “OFF” position. 5. Connect DC1607 to the DC590B USB Serial Controller using the supplied 14-conductor ribbon cable as shown in Figure 3. 6. With power off, connect a 5V, 5A power supply to VIN and GND with a series ammeter and a voltmeter as shown in Figure 3. 7. Turn on and set the VIN input power supply to 3.6V. The DC590B board gets its power from the USB cable. NOTE: Make sure that the input voltage does not exceed 6V. 8. Run the QuikEval.exe program. The LTC3675 control window (shown in Figure 7) pops up. Figure 1. Power-On Reset (POR) Warning 9. On the LTC3675 control window, select the BUCK1 Enable/Disable button. “EN” is displayed and the button background color changes to yellow, but the BUCK1 regulator is not enabled yet. The BUCK1 WRITE text box indicates the new value to be written to the register and the background color of the WRITE and READ text boxes turn yellow indicating that the controls have changed but the part has not been written to or read from. 10. Select the Write without Stop button on the LTC3675 control window. The BUCK1 register is updated via the I2C but the BUCK1 regulator has not been enabled yet. The WRITE text box background color changes orange indicating that the BUCK1 holding register has been updated but a stop bit was not received. The data in the command registers will not be latched or acted upon until a stop bit is received. 11. Select the Read Selected button on the LTC3675 control window. The BUCK1 READ text box is updated with the data in the BUCK1 command register. 12. Select the Write with Stop button on the LTC3675 control window. A stop bit is sent latching the BUCK1 data and enabling the regulator. If the status register’s Auto Readback Enabled button is selected then “HI” is displayed in the PG1 bit in the Real Time and Latch status register indicators. dc1607af 2 DEMO MANUAL DC1607A QUICK START PROCEDURE NOTE: If a fault was latched in the Status Latch register, then the Clear Interrupt button on the LTC3675 control window needs to be selected in order to update the Status Latch register. 13. Select the LED 2x/1x full-scale button. The button changes from “2 X FS” to “1 X FS” and the background color changes to yellow. 14. Set the LED GRAD slider to a middle position. The Grad Time text box indicates the time it will take to gradate each LSB step. 15. Set the LED DAC slider to a middle position. The ILED and the Ramp Time text boxes update with the new LED current setting and the new current ramp time setting. NOTE: A warning pop-up window as shown in Figure 2 will appear whenever a current greater than 20mA is selected. This is to warn the user that the LEDs on the demo board should not run for extended periods of time above 20mA. See the LED section on how to connect external LEDs if other LEDs are to be used. NOTE. If the RESET_ALL bit is set to “1” when all switching regulators and LED driver are disabled, the LTC3675 will not automatically reset to the default until either the RESET_ALL bit is set to “0”, a power on reset occurs, or a hard reset occurs. 20. Select the Clear Interrupt button on the LTC3675 control window to clear and observe that the IRQ LED extinguishes. 21. Change the EN1 jumper, JP1, from the “OFF” to the “ON” position. Observe that VOUT1 is in regulation and “HI” is displayed in the PG1 bit in the Real Time and Latch status register indicators. 22. Momentarily short VOUT1 to ground with a clip lead and observe that the RST LED, D13, on the demo board illuminates and the PG1 indicators display “LOW” after a small delay. LED shuts off and PG1 displays “HI” when short is removed. NOTE. The delay in changing the status indicators on the LTC3675 control window is caused by the time intervals between reading the status indicators and the delays in the DC590B interface. 23. Select the RSTB Mask PG1 button, then select the Write with Stop button. The RSTB Mask PG1 button changes from “1” to “0”. Figure 2. ILED Waring 16. Select the Write with Stop button and observe the LEDs ramp up in intensity to the set current. 17. Set the UVOT UV slider up to the maximum position. Verify that 3.4 is displayed in the UV voltage setting text box, then select the Write with Stop button. 18. Slowly reduce the input voltage until the IRQ LED, D12, on the DC1607 demo board illuminates and observe what the input voltage is when the LED illuminates. 19. Select the RESET ALL button under the UVOT register section on the LTC3675 control window, then select the Write with Stop button. The RESET_ALL bit is set in the UVOT register and the LTC3675 is reset to its default settings. The LTC3675 control window resets the controls to match what is read in the LTC3675 command registers. 24. Momentarily short VOUT1 to ground with a clip lead and observe that the RST and the IRQ LEDs on the demo board remain off, but the status PG1 indicators display “LOW” after a small delay. 25. Select the IRQB Mask PG1 button and then select the Write with Stop button on the LTC3675 control window. The IRQB Mask PG1 button changes from “0” to “1”. 26. Momentarily short VOUT1 to ground with a clip lead and observe that the IRQ LED on the demo board illuminates and the status PG1 indicators display “LOW” after a small delay. 27. Remove the short on VOUT1. Observe that the IRQ LED remains illuminated but only the Real Time Status PG1 indicator displays “HI”. 28. With EN1 set to the “ON” position, depress and hold the “ONB” pushbutton. Observe that the voltage on the PBSTAT terminal of the LTC3675 demo board goes low for up to five seconds while PB1 is depressed and the voltage on the WAKE terminal remains low. dc1607af 3 DEMO MANUAL DC1607A QUICK START PROCEDURE 29. With EN1 set to the “ON” position, depress and hold the “ONB” pushbutton until the RST LED illuminates. Observe that the VOUT1 regulator shuts off. The regulator restarts when the pushbutton is released. NOTE: Holding the “ONB” pushbutton depressed for greater than 5 seconds creates a hard reset. The controls and indications on the LTC3675 control window may not match the state of the LTC3675. Select the desired settings then select the Update All button on the LTC3675 control window to sync the LTC3675 with the control window. 30. Change the EN1 jumper, JP1, from the “ON” to the “OFF” position then depress the “ONB” pushbutton, PB1 (minimum of 400ms). Observe that the voltage on the PBSTAT terminal remains high but the voltage on the WAKE terminal goes high for approximately five seconds. NOTE: If the pushbutton is released and depressed while WAKE is high, PBSTAT will go low while the pushbutton is depressed and WAKE remains high. 31. Refer to the Using the LTC3675 Software section for more information on how to control the device using the LTC3675 control window. 32. Refer to the Combined Buck Setup section to set up the demo board with paralleled bucks. 33. Refer to the Optional LED/HV Boost section to set up the demo board as a high voltage boost driver. 34. Refer to the LTC3675 data sheet for more details on how the LTC3675 operates. 35. When done, turn off all loads and power supplies and close the LTC3675 control window. dc1607af 4 DEMO MANUAL DC1607A Figure 3. Proper Measurement Equipment Setup GND VIN Figure 4. Measuring Input or Output Ripple dc1607af 5 DEMO MANUAL DC1607A QUICK START PROCEDURE 1A Buck Regulators, Efficiency vs Load 100 100 VOUT1 = 1.2V 90 90 80 80 70 70 EFFICIENCY (%) EFFICIENCY (%) 1A Buck Regulators, Efficiency vs Load 60 50 40 VIN = 2.7V Burst Mode OPERATION VIN = 3.6V Burst Mode OPERATION VIN = 5.5V Burst Mode OPERATION VIN = 2.7V PULSE SKIPPING-MODE VIN = 3.6V PULSE SKIPPING-MODE VIN = 5.5V PULSE SKIPPING-MODE 30 20 10 0 1 10 100 LOAD CURRENT (mA) 1000 60 50 VOUT2 = 2.5V VIN = 2.7V Burst Mode OPERATION 30 VIN = 3.6V Burst Mode OPERATION VIN = 5.5V Burst Mode OPERATION 20 VIN = 2.7V PULSE SKIPPING-MODE VIN = 3.6V PULSE SKIPPING-MODE 10 VIN = 5.5V PULSE SKIPPING-MODE 0 1 10 100 1000 LOAD CURRENT (mA) 40 3675 G06 3675 G06 Boost Regulator, Efficiency vs Load 100 100 90 90 80 80 70 70 60 50 VOUT3 = 1.8V VIN = 2.7V Burst Mode OPERATION VIN = 3.6V Burst Mode OPERATION VIN = 5.5V Burst Mode OPERATION VIN = 2.7V PULSE SKIPPING-MODE VIN = 3.6V PULSE SKIPPING-MODE VIN = 5.5V PULSE SKIPPING-MODE 40 30 20 10 0 1 100 10 LOAD CURRENT (mA) EFFICIENCY (%) EFFICIENCY (%) 500mA Buck Regulators, Efficiency vs Load 60 50 VOUT5 = 5V VIN = 2.7V Burst Mode OPERATION VIN = 3.6V Burst Mode OPERATION VIN = 1.2V Burst Mode OPERATION VIN = 2.7V PWM MODE VIN = 3.6V PWM MODE VIN = 4.2V PWM MODE 40 30 20 10 0 1000 1 10 100 LOAD CURRENT (mA) 3675 G16 Buck-Boost Regulator, Efficiency vs Load 3675 G26 Combined Buck Regulators 1 and 2, Efficiency vs Load 100 100 90 95 70 VIN = 2.7V 60 85 VIN = 3.6V EFFICIENCY (%) EFFICIENCY (%) VIN = 3.6V, VOUT1 = 1.2V 90 80 VIN = 5.5V 50 40 30 VOUT6 = 3.3V 20 Burst Mode OPERATION 10 PWM MODE 0 1000 1 10 100 LOAD CURRENT (mA) 80 75 Burst Mode OPERATION 70 65 PULSE-SKIPPING MODE 60 55 50 45 1000 3675 G34 40 1 10 100 1000 LOAD CURRENT (mA) 10000 3675 G25 dc1607af 6 DEMO MANUAL DC1607A USING THE LTC3675 SOFTWARE The LTC3675 program provides control of the mode and slew rate of the buck regulators, plus it controls the intensity and slew rate of the LED boost controller. It also allows the user to view the contents of the status registers. Refer to Figure 7 for an illustration of the LTC3675 control window. VIEW LTC3675 PRODUCT PAGE button opens an internet browser and searches the Linear Technology Corporation web site for information on the LTC3675 when an internet connection is available. BUCK1-BUCK4, BOOST and BUCKBOOST EN/DIS buttons control the enable bit for each of the switching regulator registers. NOTE: The Write with Stop button needs to be selected in order to write to and update the LTC3675 demo board. BUCK1-BUCK4, BOOST, BUCKBOOST and LED FAST/ SLOW buttons control the slew rate bit for the associated switching regulator registers. BUCK1-BUCK4, BOOST and BUCKBOOST DAC sliders control the DAC bits which adjust the feedback reference from 0.8V to 0.425V for the associated switching regulators. When any of these sliders are changed, the associated VOUT and VRef text boxes are also updated. VOUT1-VOUT6 text box windows display the calculated output voltages of the associated switching regulator based on the selected resistor divider network. See the Change Resistor Divider Networks button for more details. VRef1-VRef6 text box windows display the feedback reference voltages of the associated switching regulator. BUCK1-BUCK4 Hi-Z/10K buttons control the Out_Hi-Z bit for each of the buck regulators. This bit sets the output to high impedance or 10kΩ to ground when disabled. BUCK1-BUCK4 Burst/PS buttons control the Mode bit for each of the buck regulator registers. This bit sets the associated buck regulator into burst or pulse skip mode. BOOST-BUCKBOOST Burst/PWM buttons control the Mode bit for the boost and the buckboost registers. This bit sets the associated regulator into burst or PWM mode. WRITE text box windows display the hexadecimal value that will be or has been written to the associated command register when the Write without Stop or Write with Stop button is selected. See the Selecting Command Registers to Write or Read section for more details. READ text box windows display the hexadecimal value that has been last read from the LTC3675 status register. See the Selecting Command Registers to Write or Read section for more details. 2 X FS/1 X FS button controls the 2 X FS bit in the LED configuration register. In 2 X FS mode the LED full-scale current is 50mA and in 1 X FS mode the LED full-scale current is 25mA. NOTE: A Warning pop-up window as shown in Figure 2 will appear whenever a current greater than 20mA is selected. This is to warn the user that the LEDs on the demo board should not run for extended periods of time above 20mA. It was determined that the LEDs on the demo board are sufficient to use above 20mA for demo purposes only. GRAD slider controls the LED GRAD bits which adjust the LED current gradation rate per LSB step from 0.056ms/step to 58.368ms/step. When this slider is changed, the Grad Time and Ramp Time text boxes are also updated. LED MODE option buttons are used to choose one of four modes using the LED configuration Mode bits. LED1/2 is used to control the current for both LED1 and LED2 by the LED DAC register. LED1 is used to control the current for only LED1 by the LED DAC register. LED2 should be disconnected to properly use this mode. HV Boost mode regulates the LED_OV pin to 0.8V to operate the Boost at a fixed voltage. HV Boost mode should not be enabled unless the demo circuit has been modified to support this mode of operation. Ext Source mode is used to control the current for both LED1 and LED2 by the LED DAC register, however the boost regulator is not powered. An external power source is needed to power the LED strings. See the Optional LED/HV Boost section for more information on the LED boost modes. NOTE: The warning pop-up window will appear as shown in Figure 5 when HV Boost mode is selected. Select “Yes” to continue or “No” to return to the previous setting. dc1607af 7 DEMO MANUAL DC1607A USING THE LTC3675 SOFTWARE register’s “Auto Readback Enabled” button is selected, the contents of this register will be periodically updated, otherwise the status register’s “Readback” button will need to be selected. Figure 5. HV Boost Warning LED DAC slider controls the DAC register which adjusts the feedback LED current from 0mA to 25mA per LED string in 1 X FS mode or 0mA to 50mA per LED string in 2 X FS mode. When this slider is changed, the ILED and Ramp Time text boxes are also updated. UV slider controls the under voltage (UV) warning bits which adjust the UV warning threshold from 2.7V to 3.4V. The UV warning causes the IRQB pin to pull low and latches a fault in the Status Latch register. NOTE: When the status register is latched, the interrupt must be cleared using the Clear Interrupt button in order to allow a new fault to be latched. OT option buttons control the overtemperature (OT) warning bits which adjust the OT warning threshold from 10° below the die OT (150°C) to 40° below the die OT. The OT warning causes the IRQB pin to pull low and latches a fault in the Status Latch register. RESET ALL button controls the RESET_ALL bit in the UVOT register. When the LTC3675 is in a WAKE or powered up state, the RESET_ALL bit resets the LTC3675 to its default settings. RSTB Mask PG7-PG1 buttons control the PGOOD7PGOOD1 bits in the RSTB Mask register. When a PG bit is set to a “1”, an associated PG fault will cause the RSTB pin to pull low. IRQB Mask PG7-PG1 buttons control the PGOOD7PGOOD1 bits in the IRQB Mask register. When a PG bit is set to a “1”, an associated PG fault will cause the IRQB pin to pull low and will cause the Status Latch register to latch. Status Real Time indicators display the PGOOD status for switching regulators VOUT1-VOUT6. The contents of this register are displayed in a text box below the Status Real Time indicators in a hexadecimal format. If the status Status Latch indicators display the UV and OT warnings plus the PGOOD status for switching regulators VOUT1-VOUT6. The contents of this register are displayed in a text box below the Status Latch indicators in a hexadecimal format. If the status register’s “Auto Readback Enabled” button is selected, the contents of this register will be periodically updated, otherwise the status register’s “Readback” button will need to be selected. Clear Interrupt button clears any IRQ faults by writing the sub-address “0F” and then reads back the Status registers. Auto Readback Enabled/Disabled button is used to automatically update the status register periodically when enabled. When disabled the status registers may be updated by selecting the “Readback” button. Readback button is used to update the status register when selected. Write without Stop button is used to write to all of the selected command registers without sending a stop bit. This will allow the user to read back the contents of the command register prior to sending a stop bit and causing the LTC3675 to take action on the new commands. A selected register to write will be displayed by the color of the WRITE text box on the control window. A WRITE text box with a white background color is not selected. See the Selecting the Command Registers to Write or Read section for more details on selecting and deselecting registers to write. Write with Stop button is used to write to all of the selected command registers followed by a stop bit. The stop bit will latch the data in the command registers and cause the LTC3675 to act upon the new commands. A WRITE text box with a white background color is not selected. See the Selecting the Command Registers to Write or Read section for more details on selecting and deselecting registers to write. dc1607af 8 DEMO MANUAL DC1607A USING THE LTC3675 SOFTWARE Update All button is used to update all of the LTC3675 command registers to the current LTC3675 control window configuration. NOTE: When power is turned off or removed, the I2C registers are reset to the LTC3675 default settings and the LTC3675 control window will not match the actual condition of the evaluation board. Use the “Update All” button to set the device to the current settings selected on the LTC3675 control window. Read Selected button is used to read all of the selected command registers. A selected register to read will be distinguished by the color of the READ text box on the control window. A READ text box with a white background color is not selected. See the Selecting the Command Registers to Write or Read section for more details on selecting and deselecting registers to write. Read All button is used to read all of the command registers. Change Resistor Divider Networks button opens up a pop-up window as shown in Figure 6 with six tabs allowing the user to change the resistor divider network for each switching regulator. These resistor values will be used to calculate the values displayed in the VOUT1-VOUT6 text boxes on the LTC3675 control window. These values are stored in the LTC3675.ini file when the LTC3675 control window is closed so the user will not have to enter the new values each time the program is run. Figure 6. Change Resistor Divider Networks Window dc1607af 9 DEMO MANUAL DC1607A USING THE LTC3675 SOFTWARE Figure 7. LTC3675 Control Window dc1607af 10 DEMO MANUAL DC1607A COMBINED BUCK SETUP The LTC3675 has the ability to combine Buck1 and Buck2 to form a 2A buck output; Buck2 and Buck3 to form a 1.5A output; and Buck3 and Buck4 to form a 1A output, each combination with a single inductor. Follow the below procedure to combine Buck1 and Buck2. 1. Remove L2, R10 and R11. 2. Move C10 to the C19 placement on the bottom side of the demo board. 3. Install a 0Ω jumper for R45 on the bottom side of the demo board. 4. Short SW1 to SW2 with a solid 24 AWG or larger bus wire on the exposed pads near C6 as shown in Figure 8. NOTE: The pads for L1 are designed to accommodate the CoilCraft XFL4020 and the TOKO FDV0530 inductors. Figure 9. Buck2 and Buck3 Combined Setup Follow the below procedure to combine Buck3 and Buck4. 1. Remove L4, R18, R20 and C16. 2. Install a 22μF, X5R, 6.3V capacitor for C28 on the bottom side of the demo board. 3. Install a 0Ω jumper for R47 on the bottom side of the demo board. 4. Short SW3 to SW4 with a solid 24 AWG or larger bus wire between the exposed portion of the L3 SW pad and the SW pad on L4 as shown in Figure 10. Figure 8. Buck1 and Buck2 Combined Setup Follow the below procedure to combine Buck2 and Buck3. 1. Remove L3, R13 and R15. 2. Install a 22μF, X5R, 6.3V capacitor for C27 on the bottom side of the demo board. 3. Install a 0Ω jumper for R46 on the bottom side of the demo board. 4. Short SW2 to SW3 with a solid 24 AWG or larger bus wire between the exposed pad and the SW pad on L3 as shown in Figure 9. Figure 10. Buck3 and Buck4 Combined Setup dc1607af 11 DEMO MANUAL DC1607A OPTIONAL LED/HV BOOST The DC1607 standard demo board is set up to operate two strings of five LEDs. The DC1607 can be modified to power up to two strings of up to ten external LEDs and operate the LED driver in any of the following operating modes. Using External LED Strings: The demo board is easily modified to drive external LED strings. To drive external LED stings, first remove the two 0Ω resistors, R28 and R29. Connect the anode of the LED string(s) to the LED BOOST terminal. Connect the cathode of one LED string to the LED1 terminal. If two LED strings are used, connect the second LED string to the LED2 terminal. Using a Single LED String: To operate a single LED string, disconnect the LED2 sting by removing the 0Ω resistor, R29. This is recommended because the LED pins are clamped at 8V. If R29 is not removed the LED string will be driven above 8V creating a current flow into LED2. Select the LED1 mode button then select the Write with Stop button on the LTC3675 control window. Operating in HV Boost Mode: To operate in HV Boost mode, remove the 0Ω resistors, R28 and R29. Change the top feedback resistor(s), R26 and R27, to the values needed to produce the desired output voltage. In HV Boost mode the LED_OV pin becomes a 0.8V feedback pin, therefore VOUT is calculated by the formula below: ⎛ R26 ⎞ VOUT = 0.8V ⎜ +1 ⎝ R27 ⎟⎠ Select the HV Boost mode button then select the Write with Stop button on the LTC3675 control window. Operating LED Strings with an External Power Source: To drive external LED strings using an external power source remove the two 0Ω resistors, R28 and R29. Connect the anode of the external LED strings to a power source. Connect the cathode of the LED strings to the LED1 and LED2 terminals. Select the Ext Source mode button then select the Write with Stop button on the LTC3675 control window. Turn on the external supply and set the desired LED current on the LTC3675 control window. NOTE: The LED pins are clamped to 8V. Pulling the LED pins above 8V will cause some current flow into the LED pins. SELECTING COMMAND REGISTERS TO WRITE OR READ The command registers are automatically selected to write to or read from when the controls on the LTC3675 control window are changed by changing the background color in the associated WRITE text box to yellow. Any command register can be selected or deselected to write by clicking in the desired WRITE text box. When a command register has been written to without a stop bit, the WRITE text box background color changes to orange to indicate that the data was not latched into the command register. program checks if the contents read from the command register matches what was last written to the command register. If they do not match, the POR warning as shown in Figure 1 pops up and the WRITE text box background color changes to red. At this point the user can select the WRITE text box then the value in the text box and the LTC3675 control window will update to what was read in the command register. If the user wishes to update the part with what was last written to the command register, then the Write with Stop or Update All buttons may be selected. When all switching regulators and the LED driver are disabled via the LTC3675 control window, the LTC3675 dc1607af 12 DEMO MANUAL DC1607A PARTS LIST ITEM QTY REFERENCE 1 2 3 4 5 6 7 8 9 1 6 7 1 2 1 10 1 4 C1 C2, C11, C12, C16, C18, C22 C3, C5, C6, C10, C20, C25, C26 C21 C13, C14 C23 D1-D10 D11 L1, L2, L5, L6 IND, SMT, 2.2μH, 21mΩ, ±20%, 3.7A, 4.0mm × 4.0mm MURATA, GRM155R71E103KA01D TDK, C1608X5R0J106M TAIYO YUDEN, JMK212ABJ226MG MURATA, GRM155R71C104KA88 MURATA, GRM188R61A22K MURATA, GRM32ER71H475KA88 LITEON, LTW-C191TS5 DIODES INC, PD3S140 COILCRAFT, XFL4020-222M 10 1 L3 IND, SMT, 2.2μH, 110mΩ, ±20%, 1.4A, 3.0mm × 3.0mm MagLayers, MLPS3015-2R2N-LT 11 1 L4 IND, CHIP, 2.2μH, 0.8mΩ, ±20%, 1.3A, 2.5mm × 2.0mm MURATA, LQM2HPN2R2MG0 12 1 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 1 1 2 2 1 1 1 5 1 2 1 1 1 1 1 2 1 1 2 3 4 5 6 7 8 9 10 11 1 4 1 0 2 7 2 2 8 0 1 IND, SMT, 10μH, 184mΩ, ±20%, 4A, 5.2mm × 5.5mm R2 RES, CHIP, 332k, ±1%, 1/16W, 0402 R3 RES, CHIP, 105k, ±1%, 1/16W, 0402 R4, R7 RES, CHIP, 324k, ±1%, 1/16W, 0402 R6, R8 RES, CHIP, 649k, ±1%, 1/16W, 0402 R10 RES, CHIP, 665k, ±1%, 1/10W, 0402 R11 RES, CHIP, 309k, ±1%, 1/10W, 0402 R13 RES, CHIP, 590k, ±1%, 1/10W, 0402 R14, R16, R19, R21, R24 RES, CHIP, 1k, ±5%, 1/16W, 0402 R15 RES, CHIP, 475k, ±1%, 1/10W, 0402 R18, R20 RES, CHIP, 511k, ±1%, 1/10W, 0402 R23 RES, CHIP, 1.05M, ±1%, 1/16W, 0402 R25 RES, CHIP, 200k, ±1%, 1/16W, 0402 R26 RES, CHIP, 2.00M, ±1%, 1/16W, 0402 R27 RES, CHIP, 42.2k, ±1%, 1/16W, 0402 R30 RES, CHIP, 20k, ±1%, 1/16W, 0402 R32, R34 RES, CHIP, 442Ω, ±1%, 1/16W, 0402 U1 7-CHANNEL CONFIGURABLE HIGH POWER PMIC ADDITIONAL DEMO BOARD CIRCUIT COMPONENTS: C7 CAP, CHIP, X5R, 22μF, ±20%, 6.3V, 0805 C4, C9, C15, C17 CAP, CHIP, NPO, 10pF, ±5%, 50V, 0402 C8 CAP, CHIP, X5R, 0.1μF, ±10%, 16V, 0402 C19, C24, C27, C28 (OPT) CAP, CHIP D12, D13 DIODE, LED, RED, SMT, 0603 R1, R5, R9, R12, R17, R22, R37 RES, CHIP, 20Ω, ±1%, 1/16W, 0402 R28, R29 RES, CHIP, 0Ω JUMPER, 1/16W, 0603 R35, R36 RES, CHIP, 5.1k, ±5%, 1/16W, 0402 R31, R33, R39-R44 RES, CHIP, 1.00M, ±1%, 1/16W, 0402 R38, R45-R47 (OPT) U2 I2C EEPROM L7 PART DESCRIPTION REQUIRED CIRCUIT COMPONENTS: CAP, CHIP, X7R, 0.01μF, ±10%, 25V, 0402 CAP, CHIP, X5R, 10μF, ±20%, 6.3V, 0603 CAP, CHIP, X5R, 22μF, ±20%, 6.3V, 0805 CAP, CHIP, X5R, 0.1μF, ±10%, 16V, 0402 CAP, CHIP, X5R, 2.2μF, ±10%, 10V, 0603 CAP, CHIP, X7R, 4.7μF, ±10%, 50V, 1210 DIODE, LED, WHITE, SMT, 0603 DIODE, SCHOTTKY, 40V, 1A, PowerDI 323 MANUFACTURER/PART NUMBER VISHAY, IHLP2020BZER-10RM01 VISHAY, CRCW0402332KFKED VISHAY, CRCW0402105KFKED VISHAY, CRCW0402324KFKED VISHAY, CRCW0402649KFKED VISHAY, CRCW0402665KFKED VISHAY, CRCW0402309KFKED VISHAY, CRCW0402590KFKED VISHAY, CRCW04021K00JNED VISHAY, CRCW0402475KFKED VISHAY, CRCW0402511KFKED VISHAY, CRCW04021M05FKED VISHAY, CRCW0402200KFKED VISHAY, CRCW0402200MFKED VISHAY, CRCW040242K2FKED VISHAY, CRCW040220K0FKED VISHAY, CRCW0402442RFKED LINEAR TECH., LTC3675EUFF TAIYO YUDEN, JMK212BJ226MG AVX, 04025A100JAT MURATA, GRM155R71C104KA88 PANASONIC, LNJ208R8ARA VISHAY, CRCW040220R0FKED VISHAY, CRCW06030000Z0ED VISHAY, CRCW04025K10JNED VISHAY, CRCW04021M00FKED MICROCHIP, 24LC025-I/ST dc1607af 13 DEMO MANUAL DC1607A PARTS LIST ITEM QTY REFERENCE 1 2 3 4 5 6 7 8 9 19 10 1 5 5 1 4 1 2 E1-E11, E17-20, E25-E28 E12-E16, E21-E24, E29 J1 JP1-JP5 JP1-JP5 PB1 PART DESCRIPTION HARDWARE-FOR DEMO BOARD ONLY: TURRET, 0.09 DIA TURRET, 0.061 DIA CONN, I2C HEADER 3-PIN JUMPER, 2mm SHUNT, 2mm SWITCH, PUSHBUTTON, SMT STAND-OFF, NYLON, 0.375" TALL (SNAP-ON) FAB, PRINTED CIRCUIT BOARD STENCIL-TOP and BOTTOM MANUFACTURER/PART NUMBER MILL-MAX, 2501-2-00-80-00-00-07-0 MILL-MAX, 2308-2-00-80-00-00-07-0 MOLEX, 87831-1420 SAMTEC, TMM-103-02-L-S SAMTEC, 2SN-KB-G C & K, PTS635SL25SMTRLFS KEYSTONE, 8832 (SNAP-ON) DEMO CIRCUIT 1607A STENCIL #1607A-TOP and BOTTOM dc1607af 14 A B C D ONB IRQB SDA SCL DVCC E29 TP9 TP8 TP10 E21 E16 ENBB E15 EN4 E14 EN3 E13 EN2 E12 EN1 GND E8 2.7V - 5.5V VIN E6 1 - 1K 5% 1K 5% R24 1K 5% R21 1K 5% R19 1K 5% R16 R14 R39 1.0M + + + + + + + HD2X7 + + + + + + + 2 4 6 8 10 12 14 JP5 R34 442 RED IRQ D12 VIN OFF ENBB ON OFF JP4 OFF JP3 OFF JP2 OFF JP1 R38 OPT 24LC025 SCLK C12 10uF 0603 C6 22uF 0805 SDA WP U2 5 7 TP6B 4 R35 5.1K 5% C21 0.1uF 16V 22 24 43 39 41 28 37 13 12 4 1 31 34 40 10 7 6 U1 CT IRQB SDA SCL DVCC ONB ENBB EN4 EN3 EN2 EN1 VIN VIN VIN VIN VIN VIN L6 2.2uH XFL4020-222M VIN C14 2.2uF 10V 0603 C1 0.01uF 25V ONB PB1 C13 2.2uF 10V 0603 06/16/10 DATE A0 A1 A2 1 2 3 6 C8 0.1uF 16V 1.0M R44 1.0M R43 1.0M R42 1.0M R41 1.0M R40 C11 10uF 0603 MARTY M. APPROVED ON EN4 ON EN3 ON EN2 ON EN1 R36 5.1K 5% VIN C7 22uF 0805 PRODUCTION FAB DC590 INTERFACE J1 1 3 5 7 9 11 13 5 38 105K R3 R2 332K LTC3675EUFF C3 22uF 0805 20 R1 R30 20K SW7 SW7 SW7 SW5 FB5 VOUT5 FB4 SW4 FB3 SW3 FB2 SW2 FB1 SW1 649K R6 R4 324K TP6A 18 19 20 32 35 33 14 11 15 9 3 8 2 5 L5 L1 L7 R26 2.0M PD3S140 D11 R37 20 10uH IHLP2020BZ-10RM R45 C24 OPT 1210 D6 D1 OPT 0 Ohm 0603 R47 OPT 0 Ohm 0603 R46 OPT 0 Ohm 0603 TP5A TP4A TP3A TP2A CUSTOMER NOTICE C23 4.7uF 50V 1206 VIN VIN VIN TP1A D7 D2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 42.2K R27 TP7 VIN C22 10uF 0603 C20 22uF 0805 2.2uH LQM2HPN2R2M L4 2.2uH MLPS3015-2R2M L3 L2 2.2uH XFL4020-222M 2.2uH XFL4020-222M 2.2uH XFL4020-222M SW4 SW3 SW2 SW1 C2 10uF 0603 3 UNLESS NOTED: RESISTORS: OHMS, 0402, 1%, 1/16W CAPACITORS: uF, 0402, 6.3V 25 44 PBSTAT 42 RST 23 VOUT6 GND 45 SWAB6 WAKE 26 SWCD6 LED_FS 27 DESCRIPTION 36 LED1 17 REVISION HISTORY 30 FB6 LED2 21 REV 8 Vcc Vss Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 4 29 LDOFB LDO_OUT LED_OV 16 ECO 20 R8 D9 200K R25 20 R22 511K R20 SCALE = NONE APP ENG. MARTY M. PCB DES. NC 20 R17 475K R15 20 R12 309K R11 20 R9 649K D4 R23 1.05M R18 511K R13 590K R10 665K R7 324K R5 APPROVALS D8 D3 C17 10pF 50V C15 10pF 50V C9 10pF 50V C4 10pF 50V 2 0 DATE: N/A SIZE TP5B R31 1.0M R32 442 RED VIN GND VOUT3 1.8V - 0.96V 500mA GND VOUT2 2.5V- 1.3V 1A GND VOUT1 1.2V- 0.64V 1A GND R33 1.0M LED1 E22 WAKE E23 RSTB E24 PBSTAT E27 LED2 E26 E25 LED BOOST VIN - 40V 2W E28 GND E20 GND E19 VOUT5 5V 1A E18 E17 VOUT4 1.6V - 0.85V 500mA E11 E10 E9 E7 E5 E4 E3 LDO_OUT 1.2V 25mA GND E1 VOUT6 3.3V 1A E2 LTC3675EUFF DEMO CIRCUIT 1607A Tuesday, August 24, 2010 IC NO. SHEET 1 OF 1 1 REV. 7 - CHANNEL CONFIGURABLE HIGH POWER PMIC 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only RST D13 VOUT4 C28 OPT 0805 VOUT3 C27 OPT 0805 VOUT2 C19 OPT 0805 TECHNOLOGY R29 0603 0 R28 0603 C26 22uF 0805 TP4B TP3B TP2B TITLE: SCHEMATIC D10 D5 C25 22uF 0805 C18 10uF 0603 C16 10uF 0603 C10 22uF 0805 C5 22uF 0805 TP1B VOUT1 1 A B C D DEMO MANUAL DC1607A SCHEMATIC DIAGRAM dc1607af 15 DEMO MANUAL DC1607A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc1607af 16 Linear Technology Corporation LT 1010 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2010