DC1607A - Demo Manual

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
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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.
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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.
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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.
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DEMO MANUAL DC1607A
Figure 3. Proper Measurement Equipment Setup
GND
VIN
Figure 4. Measuring Input or Output Ripple
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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
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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.
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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.
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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
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DEMO MANUAL DC1607A
USING THE LTC3675 SOFTWARE
Figure 7. LTC3675 Control Window
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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
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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
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