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DEMO MANUAL DC
1976A-A
The three status registers, which can be read via I2C,
indicate which regulators are in regulation and if a UV or
OT event 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 LTC3676EUJ data sheet for more details on
the electrical and timing specifications and for an explan-
ation of the different device options.
Design files for this circuit board are available at
http://www.linear.com/demo
Description
LTC3676EUJ
Power Management Solution
for Application Processors
Demonstration circuit 1976A-A is a multioutput power
supply with a pushbutton controller and I2C, featuring
the LTC
®
3676EUJ. The LTC3676EUJ has four synchro-
nous buck regulators, an always-on LDO and three LDO
regulators. The input voltage range of the LTC3676EUJ is
ideal for single-cell Li-Ion/Polymer battery applications.
The switching regulator settings, such as enables, feed-
back voltages, operating modes and other functions, can
be controlled via I2C. All of the regulators, except the
always-on LDO1, can also be enabled via external enable
pins. After the first regulator is enabled, the remaining
enable pins use a precision threshold to allow hardwired
power-up sequences. All the regulators, except LDO1, can
also be enabled via the I2C.
The LTC3676EUJ has three status registers, PGSTATL,
PGSTATR and IRQSTAT, that can be used to determine
the current state of the device.
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.
performance summary
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Voltage Range 2.7 5.5 V
VBUCK1 Buck Regulator 1 Output Voltage Buck 1 Enabled, IBUCK1 = 0 ~ 1.5A 1.82 3.31 3.72 V
VBUCK2 Buck Regulator 2 Output Voltage Buck 2 Enabled, IBUCK2 = 0 ~ 1.5A 0.76 1.38 1.58 V
VBUCK3 Buck Regulator 3 Output Voltage Buck 3 Enabled, IBUCK3 = 0 ~ 2.5A 0.76 1.38 1.58 V
VBUCK4 Buck-Boost Regulator Output Voltage Buck4 Enabled, IBUCK4 = 0 ~ 2.5A 0.82 1.50 1.71 V
VLDO1 LDO1 Regulator Output Voltage LDO1 Is Always On, ILDO1 = 0 ~ 25mA 2.92 3.01 3.10 V
VLDO2 LDO2 Regulator Output Voltage LDO2 Enabled, ILDO2 = 0 ~ 300mA 2.73 2.81 2.89 V
VLDO3 LDO3 Regulator Output Voltage LDO3 Enabled, ILDO3 = 0 ~ 300mA 1.75 1.80 1.85 V
VLDO4 LDO4 Regulator Output Voltage LDO4 Enabled, ILDO4 = 0 ~ 300mA 1.16 1.20 1.24 V
Specifications are at TA = 25°C
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dc1976aafa
DEMO MANUAL DC
1976A-A
Quick start proceDure
1. Ensure that JP1 to JP3, SW1 and SW2 are in their
default positions, as shown in Figure 1. Set PS1 to 5V
and turn on. The RST0 LED should light until LDO1
comes on, and the PGOOD LED should come on and
stay on
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 used. Please set DVCC to 5V.
2. Start the Linear Technology QuikEval™ program. This
program should automatically detect the presence of
the LTC3676EUJ demo board (DC1976A-A) and activate
the appropriate GUI, as seen in Figure 3. The GUI reads
back the current voltages of the regulators. LDO1 should
read 3V, and VIN should read 5V; all others should be
0V.
3. Press the PB1 button on the DC1976A-A for more
than 0.5s; all of the power supplies should come up
and the displayed GUI page should match Figure 3.
The sequencing for these supplies was set by Linear
Technology, using resistor divider networks from the
supply outputs to control the ENx lines.
4. Each of the supplies can be loaded to test the regulators,
but be aware that LDO2~4 are powered from VIN, and
the dissipation can be significant. If significant current
is desired from these regulators, care with input voltage
selection will be required.
5. Press and hold the PB1 button for more than 5s, and
all of the regulators, except LDO1, will shut down. The
GUI will show the voltages for all regulators, other than
always-on LDO1, as 0V.
6. Refer to the Using the LTC3676EUJ Software section
for more information on how to control the device using
the LTC3676EUJ control window.
7. Refer to the LTC3676EUJ data sheet for more details
on how the LTC3676EUJ operates.
8. When done, close the LTC3676EUJ GUI and turn off
all loads and power supplies.
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dc1976aafa
DEMO MANUAL DC
1976A-A
Quick start proceDure
Figure 1. Proper Measurement Equipment Setup
Figure 2. Measuring Input or Output Ripple
GND
VIN
Note: All connections from equipment should be Kelvin connected directly to the board pins to
which they are connected on this diagram. Any input or output leads should be twisted-pair.
4
dc1976aafa
DEMO MANUAL DC
1976A-A
using the Ltc3676euJ software
Introduction
The LTC3676EUJ GUI provides control of most aspects
of operation of the LTC3676EUJ. The LTC3676EUJ GUI
also provides a means to manage the feedback divider
resistors, turn the regulators on and off manually, and
even to experiment with sequencing.
The LTC3676EUJ GUI is composed of four forms:
n The LTC3676 (DC1976A-A) form (Figure 3) is brought
up by the QuikEval program.
n The Manage Resistors form (Figure 4) is brought up by
pressing the Change Resistor Divider Networks button
on the LTC3676 form.
n The Advanced Settings form (Figure 5) is brought up by
pressing the Advanced Settings button on the LTC3676
form.
n The Sequencing form is brought up by pressing the
Change LTC3676 Sequencing button.
The sequencing form, in turn, contains three tabs: Direct
(Figure 6), Table (Figure 7) and Shutdown (Figure 8).
These allow direct control and table based sequencing,
respectively, of power-up and sequencing of shutdown.
SW1, positions 1 to 6, sets the source of the ENx signals
to the preselected resistor networks or to the on-board
microcontroller. SW1 should be set to Resistor Control
for normal mode, and µC Control for sequence modes
(Direct and Table).
SW2 controls the source of PWR_ON. Resistor Control,
PWR_ON = VLDO3, makes the source the LD03 regulator
output. µC Control, PWR_ON = µC, makes it controlled
by the on-board microcontroller. This switch should be
set to Resistor Control for normal mode and µC Control
for sequence modes.
View the LTC3676EUJ Product Page
This button opens your default Internet browser, and
searches the Linear Technology Corporation website for
information on the LTC3676EUJ when an Internet con-
nection is available.
Buck1 ~ Buck4 and LDO2~LDO4 Sections
These sections control most aspects of the regulator
operation. Some of the controls for the regulators are on
the Advanced Settings form. Please consult the data sheet
for operation of these bits.
Whenever the DAC sliders are changed or the regulator
is switched between normal and standby, the appropriate
control registers are changed.
If the text box has a grey background, it cannot be directly
edited. A good example of this is the command registers
SCR1, OVEN, SCR2, etc., at the bottom of the LTC3676
form. These registers are changed by the various controls
on the form.
The Auto Readback Enabled button determines if the
IRQSTAT, PGSTATL and PGSTATR values are automatically
read back. If automatic readback is disabled, the Readback
button will do a one-time readback.
The Auto Update Enabled button determines if the com-
mand registers are automatically sent to the LTC3676 on
change, and if the values of these registers are automati-
cally read back. If automatic update is disabled, the Update
All button will update all the command registers and read
back the values.
For all the automatic update modes, an internal 100ms
timer is used, so all values will be updated every 100ms,
if enabled.
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dc1976aafa
DEMO MANUAL DC
1976A-A
using the Ltc3676euJ software
Figure 3. Main Form
Figure 4. Manage Resistors Form
6
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DEMO MANUAL DC
1976A-A
using the Ltc3676euJ software
Figure 5. DC1976A-A (LTC3676EUJ) Advanced Settings Form
Interrupts and Status
The current state of IRQSTAT, PGSTATL and PGSTATR are
displayed on the right. If an interrupt is pending, the IRQ LED
(D1) on the DC1976A-A demo board will light. The interrupt
box will change color to red, and indicate Interrupt
Pending. To clear the interrupt, press the Clear Interrupt
button.
Advanced Settings Button
This button brings up the Advanced Settings form
(Figure 5), which allows the control of several less used
bits. Any changes made in this form will immediately
be reflected in the appropriate command registers on
the LTC3676 form. However, if Auto Update Enabled is
disabled, the value will not be sent to the LTC3676EUJ
until auto update is re-enabled or Update All is pressed.
Mode Display
This box displays the current operating mode. The value
of this box can be changed in the sequence form.
Load Factory Defaults
The factory default values for the command registers,
regulator resistors and auto update states are immediately
loaded.
Load Stored Values
The state of the command registers, regulator resistors and
auto update states can be saved to a file and reused. This
button causes the saved states to be loaded immediately.
Save Current Values
Immediately saves the state of the command registers,
regulator resistors and auto update states to file.
Start-Up
The start-up section determines what the GUI will do at
start-up, load default or stored command register, regula-
tor resistors and auto update states.
Shutdown
The shutdown section determines what the GUI will do at
shutdown, store the current command register, regulator
resistor resistors and auto update values or not.
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dc1976aafa
DEMO MANUAL DC
1976A-A
using the Ltc3676euJ software
Change Resistor Divider Networks Button
This button brings up the Manage Feedback Divider Resistor
Values form (Figure 4), which allows for different feedback
divider resistor values. Any changes made in this form will
immediately be reflected in the appropriate voltage value
boxes on the LTC3676 form. It is the user’s responsibility
to ensure that the values in this form are the same as the
values of the actual resistors on the demo board.
Change LTC3676 Sequencing Button
This brings up the sequencing form which has three tabs,
Direct (Figure 6),Table (Figure 7) and Shutdown (Figure
8).These allow the direct control of the regulator on/off
(Direct tab), or set up a sequence that will be downloaded
to the on-board microcontroller to set the regulator se-
quencing (Table tab).
Both the direct and the table modes require that all posi-
tions of the SW1 dipswitch be in the µC Control position.
Neither direct nor sequence mode can be enabled from
the other mode. You must be in normal mode to enable
direct or sequence mode.
Returning to normal mode explicitly, by using a button
to disable direct or sequence modes, resets the regula-
tor states to the default. However, if you return to normal
mode by completing a downloaded sequence, the regulator
states are not reset.
Direct
To directly control the on/off state of the regulators, choose
the Direct tab, enable direct mode (the mode display on
the LTC3676 form should change to direct). Ensure that
the dipswitch positions are in the correct state and check
the appropriate boxes. The regulators can now be turned
on and off directly.
The Measured Voltage boxes are live and update on the
100ms update timer.
Figure 6. Sequence, Direct Form
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dc1976aafa
DEMO MANUAL DC
1976A-A
using the Ltc3676euJ software
Figure 7. Sequence, Table Form
Table
To set up a sequence for the power supplies to power up,
choose the Table tab. Do not enable sequence mode until
a sequence table has been downloaded. Sequence tables
can only be downloaded in normal mode.
Some error checking is done on the table before down-
loading, such as ensuring that at least one regulator is
controlled by WAKE, but in general, the user must ensure
that the sequence table is reasonable.
In particular, always ensure that one regulator is controlled
by WAKE and that at least one regulator is used in the
particular sequence controls PWR_ON. It is not necessary
that you use all regulators, nor that only one regulator is
controlled at a time. For example, WAKE could start all
regulators, or just one. If PWR_ON is not asserted in the
sequence, the sequence will execute, but the regulators
will shut down after 5s.
Once a sequence has been downloaded, and sequence
mode has been set, press the PB1 button to start the
sequence. In sequence mode it is not necessary to press
the PB1 button for 0.5s.
The level of the WAKE signal is the same as the level of
the VIN signal, that is, if VIN is 3V, WAKE will assert at 3V.
So, when choosing the threshold voltage for WAKE, make
sure that you do not set it higher than the VIN voltage. In
fact, you should choose a voltage that is ≈ VIN/2.
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dc1976aafa
DEMO MANUAL DC
1976A-A
using the Ltc3676euJ software
Figure 8. Shutdown Sequencing Form
When PWR_ON is asserted in the sequence, the on-board
microcontroller determines that the sequence is done and
sets the state to normal (without resetting the states of
the regulators). The sequence / table form can now be
closed. If you wish to rerun the sequence, hold down PB1
for more than 5s, until the regulators shut off. Go to the
sequence / table form, and enable sequence mode. It is
not necessary to download the sequence table again, as
it is still the in the on-board microcontroller’s memory.
Now, just press the PB1 button to restart the sequence.
Shutdown
Choose sequencing for shutdown. To activate shutdown
sequence, hold MON (PB1) down for more than 10s.
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dc1976aafa
DEMO MANUAL DC
1976A-A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 5 C1, C11, C14, C17, C21 CAP, CHIP, X5R, 10µF, ±20%, 6.3V, 0603 TDK, C1608X5R0J106M
2 6 C2, C3, C4, C5, C6, C7 CAP, CHIP, X5R, 1µF, ±10%, 10V, 0402 MURATA, GRM155R61A105KE15D
3 4 C10, C13, C16, C19 CAP, CHIP, X5R, 47µF, ±20%,6.3V, 0805 SAMSUNG, CL21A476MQYNNNB
4 4 C12, C15, C18, C22 CAP, CHIP, C0G, 10pF, ±0.5pF, 50V, 0402 VISHAY, VJ0402A4R7
5 4 L1, L2, L3, L4 IND, SMT,1.5µH, 36mΩ, ±20%, 5.8A,
4.2mm × 4.2mm COILCRAFT, XFL4020-152ME
65 R1, R3, R28, R31, R34 RES, CHIP, 1M, ±1%, 1/16W, 0402 VISHAY, CRCW04021M00FKED
7 1 R2 RES, CHIP, 316k, ±1%, 1/16W, 0402 VISHAY, CRCW0402316KFKED
8 1 R4 RES, CHIP, 332k, ±1%, 1/16W, 0402 VISHAY, CRCW0402332KFKED
9 1 R27 RES, CHIP, 931k, ±1%, 1/10W, 0402 VISHAY, CRCW0402931KFKED
10 4 R29, R32, R35, R38 RES, CHIP, 20Ω, ±5%, 1/16W, 0402 VISHAY, CRCW040220R0JNED
11 2 R30, R33 RES, CHIP, 1.10M, ±1%, 1/16W, 0402 VISHAY, CRCW04021M10FKED
12 2 R43, R60 RES, CHIP, 6.49k, ±1%, 1/16W, 0402 VISHAY, CRCW04026K49FKED
13 7 R44, R46, R48, R50, R52, R54,
R59 RES, CHIP, 10k, ±1%, 1/16W, 0402 VISHAY, CRCW040210K0FKED
14 1 R45 RES, CHIP, 7.15k, ±1%, 1/10W, 0402 VISHAY, CRCW04027K15FKED
15 2 R47, R49 RES, CHIP, 2.67k, ±1%, 1/16W, 0402 VISHAY, CRCW04022K67FKED
16 2 R51, R53 RES, CHIP, 22.1k, ±1%, 1/16W, 0402 VISHAY, CRCW040222K1FKED
17 1 R55 RES, CHIP, 511k, ±1%, 1/16W, 0402 VISHAY, CRCW0402511KFKED
Additional Demo Board Circuit Components
1 4 C8, C9, C25, C27 CAP, CHIP, X7R, 0.1µF, ±10%, 16V, 0402 MURATA, GRM155R71C104KA88D
2 0 C20 CAP, CHIP, 0805 Customer defined
3 2 C26, C28 CAP, CHIP, C0G, 1000pF, ±5%, 50V, 0402 TDK, GRM1555C1H102J
4 2 C23, C24 CAP, CHIP, X5R, 2.2µF, ±20%, 6.3V, 0402 MURATA, GRM155R60J225ME15D
5 2 D1, D3 DIODE, LED, RED, SMT, 0603 LITEON, LTST-C193KRKT-5A
6 1 D2 DIODE, LED, ORANGE, RECT, CLEAR, 0603 LITEON,LTST-C193KFKT-5A
7 1 D4 DIODE, SCHOTTKY, SMT, 20V, 0.5A, SOD123 ON SEMICONDUCTOR, MBR0520LG
8 1 D5 DIODE, Si SWITCHING, 100V, 80mA, SOD123 ON SEMICONDUCTOR, MMSD4148G
9 1 M1 MOSFET, 60V, 10Ω, 115A, SOT-23 FAIRCHILD, 2N7002L
10 1 PB1 SWITCH, WS-TRS, TACT , SMD, 6mm × 3.8mm WÜRTH, 434 111 025 826
11 1 Q1 BITRANS., GP SS NPN 40V, SOT-23 ON SEMICONDUCTOR, MMBT3904LT1G
12 4 R5, R10, R39, R56 RES, CHIP, 1k, ±5%, 1/16W, 0402 VISHAY, CRCW04021K00JNED
13 4 R6, R8, R9, R40 RES, CHIP, 100k, ±5%, 1/16W, 0402 VISHAY, CRCW0402100KJNED
14 11 R11, R12, R13, R14, R15, R16,
R17, R18, R19, R20, R21 RES, CHIP, 10k, 5%, 1/16W, 0402 VISHAY, CRCW040210K0JNED
15 3 R22, R23, R25 RES, CHIP, 5.1k, 5%, 1/16W, 0402 VISHAY, CRCW04025K10JNED
16 2 R24, R26 RES, CHIP, 4.7k, ±5%, 1/16W, 0402 VISHAY, CRCW04024K70JNED
17 2 R41, R42 RES,CHIP, 100k , ±1%, 1/16W, 0402 VISHAY, CRCW0402100KFKED
18 1 SW1 SWITCH, SMT, SPDT, 6 POS. DIP, 37mm × 8mm CTS ELECTROCOMPONENTS, 204-126ST
19 1 SW2 SWITCH, SMT, SPDT, 1 POS. DIP, 7mm × 8mm CTS ELECTROCOMPONENTS, 204-121-LPST
20 1 U2 I2C EEPROM MICROCHIP, 24LC025-I/ST
11
dc1976aafa
DEMO MANUAL DC
1976A-A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
21 1 U3 PIC MICROCONTROLLER, 6mm × 6mm QFN-16 MICROCHIP, PIC16F722-I/ML
22 1 U4 LOW NOISE REGULATED CHARGE PUMP IN
2mm × 2mm DFN LINEAR TECH., LTC3204BEDC-5
Hardware For Demo Board Only
118 E1-E4, E6, E7, E9-E12, E28-E35 TURRET, 0.09 DIA MILL-MAX, 2501-2-00-80-00-00-07-0
2 17 E5, E8, E13-E27 TURRET, 0.061 DIA MILL-MAX, 2308-2-00-80-00-00-07-0
3 1 J1 CONN, HEADER 14POS 2MM VERT GOLD MOLEX, 87831-1420
4 1 J2 HEADER, 2mm × 3mm, 0.079 DOUBLE ROW SAMTEC, TMM-103-02-L-D
5 2 JP1, JP2 HEADER, 1mm × 4mm PIN 0.079 SINGLE ROW SAMTEC, TMM-104-02-L-S
6 1 JP3 HEADER, 1mm × 3mm PIN 0.079 SINGLE ROW SAMTEC, TMM-103-02-L-S
9 1 FAB, PRINTED CIRCUIT BOARD DC1976A-5-A/B
Required Circuit Components
1 1 R7 RES, CHIP, 732k, ±1%, 1/16W, 0402 VISHAY, CRCW0402732KFKED
2 1 R36 RES, CHIP, 280k, ±1%, 1/16W, 0402 VISHAY, CRCW0402280KFKED
3 1 R37 RES, CHIP, 1M, ±1%, 1/10W, 0402 VISHAY, CRCW04021M00FKED
4 1 R57 RES, CHIP, 1.10M, ±1%, 1/10W, 0402 VISHAY, CRCW04021M10FKED
5 0 R58 NO LOAD
6 1 R61 RES, CHIP, 0Ω JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED
7 1 U1 PMIC FOR APPLICATION PROCESSORS LINEAR TECH., LTC3676EUJ
12
dc1976aafa
DEMO MANUAL DC
1976A-A
schematic Diagram
Figure 9. PMIC for Application Processors
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
1.10MEG
0.85V - 1.50V - 1.66V
- A
300mA
*
IRQ
ON
OPEN
2A
- B
NOTES: UNLESS OTHERWISE SPECIFIED -
ALL RESISTORS ARE ±1%, 0402
ALL CAPACITORS ARE ±10%, 50V, 0402
ALL INDUCTORS ARE ±20%
RSTO
0 Ohm
2.908V
1.7V - VIN
ON
OPEN
R7
2.5A
0.78V - 1.38V - 1.53V
1.5A
3.01V
1.7V - VIN
300mA
732k
OPEN
25mA
1MEG
280k
LDO34VIN
EXT
R58
OFF
R57
0 Ohm
1.200V / 1.2V, 2.5V, 2.8V, 3.3V
0.78V - 1.38V - 1.53V
R37
300mA
U1
OPEN
VIN
EXT
1.5A
LTC3676EUJ
ASSY
2.5A
1.8V
LTC3676EUJ-1
LDO2VIN
DC590 INTERFACE
2.7V - 5.5V
VIN
1.88V - 3.31V - 3.66V
VIO / VTT (B1)
R36
AMBER
VIO / VTT (B1)
0 Ohm
R61
OPEN
GEORGE B.
PRODUCTION FAB-5 8 - 6 - 13
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
5
DEMO CIRCUIT 1976A - A / B
12
PMIC FOR APPLICATION PROCESSORS
N/A LTC3676EUJ / LTC3676EUJ-1
NC
GEORGE B.
8 - 6 - 13
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
EN_B1
VLDO4
DVDD
PWR_ON
SCL
SDA
VBUCK4
EN_B3
EN_L2
PGOOD
EN_B4
VBUCK1
VIN
EN_B2
WAKE
VBUCK4
VLDO2
EN_L3
VBUCK2
VBUCK3
VLDO3
VLDO1
EN_L4
VIN
VIO
VIO
VIO
590DVDD
VIN
VIN
VIN
C18
10pF
±0.5pF
C16
47uF
0805
6.3V
20%
R16 10k 5%
C22
10pF
±0.5pF
C5
1uF
10V
R37 *
E12
GND
E13
FB_L4 / VDDQIN
TP3
INJ2
E22
EN_B1
R12 10k 5%
U1
LTC3676EUJ / LTC3676EUJ-1
27
41
8
11
26
15
14
12
13
16
23
20
22
35
31
25
36
40
24
17
18
34
37
28
9
2
30
3
1
10
5
4
6
38
32
7
33
39
29
19
21
VIN
GND
FB_L4 / VDDQIN
SW4
FB_L1
PVIN4
SCL
DVDD
SDA
PVIN3
FB_B4
SW3
FB_B3
PVIN2
SW2
FB_B2
PVIN1
SW1
FB_B1
EN_B4
EN_B3
EN_B2
EN_B1
LDO1
EN_L4 / VTTR
VIN_L2
EN_L2
LDO2
FB_L2
EN_L3
VIN_L3
LDO3
LDO4
nRST0
nIRQ
VIN_L4
WAKE
PGOOD
nON
VSTB
PWR_ON
R27
931k
C1
10uF
0603
6.3V
20%
E34
GND
E33
V (SOC) (B2)
E3
VRTC (LDO1)
R4
332k
E2
GND
R23
5.1K
5%
L1
1.50µH
XFL4020-152ME
2 1
JP3
PGOOD LED
E17
WAKE
E23
EN_B2
C13
47uF
0805
6.3V
20%
E6
VDD HIGH (LDO2)
R13 10k 5%
C15
10pF
±0.5pF
E18
PGOOD
E32
GND
E1
VIN
C14
10uF
0603
6.3V
20%
R38
20
5%
R32
20
5%
C4
1uF
10V
E24
EN_B3
TP4
INJ1
R30
1.10MEG
R14 10k 5%
R17 10k 5%
E7
GND
E31
V (ARM) (B3)
U2
24LC025I/ST
256X8
1
6
3
4
5
2
7
8
A0
SCLK
A2
Vss
SDA
A1
WP
Vcc
R9
100k
5%
R2
316k
R58 *
E14
EN_L4 / VTTR
R56
1K
5%
D4
MBR0520
2 1
R22
5.1K
5%
E25
EN_B4
C21
10uF
0603
6.3V
20%
E30
GND
R15 10k 5%
R18 10k 5%
R1
1MEG E35
V (IO) / VTT (B1)
E26
EN_L2
C3
1uF
10V
E29
V (DDR) (B4)
D1
RED
12
R19 10k 5%
C7
1uF
10V
C11
10uF
0603
6.3V
20%
E27
EN_L3
E28
GND
R8
100k
5%
R11 10k 5%
R7 *
C20
0805
OPT
R24
4.7k
5%
R10
1K
5%
L4
1.50µH
XFL4020-152ME
R20 10k 5%
C8
0.1uF
16V
E5
VIN_LDO2
R29
20
5%
C2
1uF
10V
E19
ON
R6
100k
5%
R34
1MEG
E8
VIN_LDO34
C12
10pF
±0.5pF
R26
4.7k
5%
R36 *
JP1
L3
1.50µH
XFL4020-152ME
2 1
D2
PGOOD
12
R21 10k 5%
J1
HD2X7
1
3
5
7
9
11
13
2
4
6
8
10
12
14
+
+
+
+
+
+
+
+
+
+
+
+
+
+
C6
1uF
10V
R57*
E9
V(LDO3)
C9
0.1uF
16V
D3
RED
12
C19
47µF
0805
6.3V
20%
E20
VSTB
JP2
PB1
R31
1MEG
C17
10uF
0603
6.3V
20%
L2
1.50µH
XFL4020-152ME
2 1
TP1
INJ4
E15
RST0
E11
V (LDO4)
R5
1K
5%
E4
GND
R25
5.1K
5%
E21
PWR_ON
R28
1MEG
R35
20
5%
E10
GND
C10
47uF
0805
6.3V
20%
TP2
INJ3
R33
1.10MEG
E16
IRQ
R3
1MEG
13
dc1976aafa
DEMO MANUAL DC
1976A-A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram
Figure 10. PMIC for Application Processors
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
NOTES: UNLESS OTHERWISE SPECIFIED -
ALL RESISTORS ARE ±1%, 0402
ALL CAPACITORS ARE ±10%, 50V, 0402
ICD INTERFACE
WAKE - > B3 - > LDO2 -> B4 -> LDO3 & LDO4 (DC1976A-A ONLY)
-> B2 -> B1
POWER UP SEQUENCE
5
DEMO CIRCUIT 1976A - A / B
22
PMIC FOR APPLICATION PROCESSORS
N/A LTC3676EUJ / LTC3676EUJ-1
NC
GEORGE B.
8 - 6 - 13
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
bWAKE
SDA
EN_L2
VIN
EN_B3
VBUCK1
VLDO4
WAKE
VLDO1
PGOOD
VLDO2
VBUCK2
EN_B2
PWR_ON
EN_B4
EN_B1
SCL
VBUCK3
VLDO3
VBUCK4
EN_L4
EN_L3
DVDD
590DVDD
VBUCK4
VBUCK3
VBUCK4
BWAKE
VLDO2
VBUCK3
VLDO2
VLDO2
VBUCK4
C27
0.1uF
16V
R60
6.49k
J2
1 2
3 4
5 6
R52
10k
SW1E
SPDT
9
10 15
16
R43
6.49k
R42
100k
Q1
MMBT3904LT1G
1
2 3
R44
10k
R50
10k
R47
2.67k
C24
2.2uF
6.3V
20%
R41
100k
C25
0.1uF
16V
SW1A
SPDT
1
2 23
24
R54
10k
R61 *
D5
MMSD4148T1G
2 1
R51
22.1k
R40
100k
5%
M1
2N7002L
3
1
2
SW1B
SPDT
3
4 21
22
R49
2.67k
SW2
SPDT
1
2 3
4
U3
PIC16F722-I/ML
26
27
28
1
2
3
4
25
24
23
22
21
20
19
18
15
14
13
12
11
10
9
8
6
7
17
5 16
RE3/MCLR/Vpp
RA0/AN0/SS/Vcap
RA1/AN1
RA2/AN2
RA3/AN3/Vref
RA4/CPS6/T0CKI
RA5/AN4/CPS7/SS/Vcap
RB7/ICSPDAT
RB6/ICSPCLK
RB5/AN13/CPS5/T1G
RB4/AN11/CPS4
RB3/AN9/CPS3/CCP2
RB2/AN8/CPS2
RB1/AN10/CPS1
RB0/AN12/CPS0/INT
RC7/RX/DT
RC6/TX/CK
RC5/SDO
RC4/SDI/SDA
RC3/SCK/SCL
RC2/CCP1
RC1/T1OSI/CCP2
RC0/T10S0/T1CKI
RA7/OSC1/CLKIN
RA6/OSC2/CLKOUT/Vcap
Vdd
Vss1Vss2
U4
LTC3204BEDC-5
2
1 7
4
5
36
Vin
GND GND
C+
C-
VOUTSHDN
SW1F
SPDT
11
12 13
14
R53
22.1k
R48
10k
R45
7.15k
R39
1k
5%
SW1C
SPDT
5
6 19
20
R55
511k
R46
10k
C26
1000pF
5% R59
10k
C28
1000pF
5%
C23
2.2uF
6.3V
20%
SW1D
SPDT
7
8 17
18
14
dc1976aafa
DEMO MANUAL DC
1976A-A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2013
LT 1013 REV A • PRINTED IN USA
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. LT C 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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
