LINER DC980A Monitors and margins two power supply Datasheet

DEMO MANUAL
DC980A/DC980B
Dual Power Supply Monitor
and Margining Controller with LTC3828
Dual DC/DC Supply
Description
The DC980A and DC980B are a demonstration system that
showcases the LTC2970, a dual power supply monitor and
margining controller with an I2C interface. The DC980A
board contains the LTC2970 device and the DC980B
board contains the LTC3828 dual DC/DC controller. The
two boards interface to each other via a 20-pin connector. The DC980B board features the LTC3828 dual output,
2-phase synchronous buck regulator. The LTC2970’s
two voltage-buffered, 8-bit IDACs allow highly accurate
margining of the LTC3828’s output voltages. The IDACs
can be configured to automatically servo the power supplies to a desired voltage using the ADC for feedback. The
DC980B comes preconfigured with 3.3V and 5V power
supply rail voltages.
The LTC2970’s low drift reference and 14-bit ∆∑ A/D
converter allow precise measurements of two power supply output voltages and load currents. Fault management
allows ALERTB to be asserted for configurable over- and
undervoltage fault conditions.
This demonstration system is supported by the
LTpowerPlay™ graphical user interface (GUI) which enables
complete control of all the features of the device. Together,
the LTpowerPlay software and DC980A/DC980B hardware
system create a powerful development environment for
designing and testing hardware configurations for the
LTC2970. The software displays the LTC2970 features and
provides real time measurements from the device’s ADC
and status registers. Telemetry also allows easy access
of the fault status created by the LTC2970.
The LTC2970 features may be evaluated with the LTC3828
based power supplies, or alternatively the DC980B board
may be removed and DC980A can then be connected to
an external power supply circuit.
The DC980B demo board is powered by an external 8V
to 15V power supply. To power the DC980A demo board,
you have two choices. It may be powered from either the
DC590 USB-to-I2C controller or from the DC980B board
using an external jumper wire. Communication with the
software is provided through the DC590 USB-to-I2C controller. The following is a checklist of items which can be
obtained from the LTC website or LTC field sales.
n
n
USB-to-I2C/Serial Controller (DC590)
LTpowerPlay Software
DC980A/DC980B Features
n
n
n
n
n
n
n
n
n
n
n
n
Monitors and Margins Two Power Supplies
Two Output Voltage Monitors
Two Input Voltage Monitors
Two Output Current Monitors
Telemetry Reads Back VIN, VOUT, IOUT, Temperature
Supported by LTpowerPlay GUI
I2C Adjustable OV/UV Trip Points
Margin or Trim Supplies to ±0.5% Accuracy
I2C/SMBus Serial Interface
Programmable GPIO for Fault Reporting
Powered from External Power Supply
LTC2970 Available in 24-Pin QFN Package
Design files for this circuit board are available at
http://www.linear.com/demo/DC980
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
dc980abf
1
DEMO MANUAL
DC980A/DC980B
Performance Summary
Specifications are at TA = 25°C
Table 1. LTC2970 Performance Summary
PARAMETER
CONDITIONS
VALUE
12VIN Supply Input Voltage Range
8V to 15V
VDD Supply Input Voltage Range
4.5V to 5.75V
ADC Full-Scale Accuracy
±0.4%
VIN = 3V
ADC Total Unadjusted Error
±0.5%
ADC Input Range
0V to 6V
ADC Resolution
Resolution = 8.192V/16384
500µV/LSB
ADC Conversion Rate
30Hz
Margining DAC Resolution
8-Bits
Temperature Sensor Resolution
0.25°C/LSB
I2C Serial Clock Frequency
10kHz to 400kHz
Table 2. Demo Board System Specifications
NOMINAL
UNTRIMMED
VOUT
TOP FEEDBACK
RESISTOR
BOTTOM
FEEDBACK
RESISTOR
DAC RESISTOR
IDAC
RESISTOR
MARGIN
RANGE
VOUT1
5V ±1.5%
105k
20k
147k
6.34k
±10%
VOUT2
3.3V ±1.5%
95.3k
30.1k
196k
6.34k
±10%
Notes:
1. Load current < 5A is recommended.
2. Output voltages can be margined by ±10% from nominal with the default resistor values. These values may be changed
to create output voltages other than 5V and 3.3V. Use the Resistor Selection Tool which is accessed from LTpowerPlay.
The LTC3828’s feedback node voltage is 0.8V.
Glossary of Terms
The following list contain terms used throughout the
document.
Rail: The final output voltage that the power supply controller manages.
Channel: The collection of functions that monitor, supervise, and trim a given power supply rail.
Supervise: The act of quickly responding (warning or
faulting) to a voltage or current condition that is compared
to preprogrammed values.
Margin: Term used typically in board level testing that
increases/decreases the output voltage to look for sensitivity/marginality problems.
Trim: The act of adjusting the final output voltage. A servo
loop is typically used to trim the voltage.
Monitor: The act of measuring voltage, current, and temperature readings.
dc980abf
2
DEMO MANUAL
DC980A/DC980B
LTpowerPlay GUI SOFTWARE
LTpowerPlay is a powerful Windows-based tool that supports Linear Technology products, including the LTC2970
dual power supply monitor and margining controller. You
can use LTpowerPlay to evaluate Linear Technology ICs by
connecting to a demo board system. LTpowerPlay utilizes
the DC590 USB I2C/serial controller to communicate with
one of many potential targets, including the DC980A/B
demo system or a customer board. The software also
SYSTEM TREE OF
ALL DEVICES
CONFIGURATION SETTINGS FOR
ALL DEVICES IN SYSTEM TREE
provides an automatic update feature to keep the software
current with the latest set of device drivers and documentation. The LTpowerPlay software can be downloaded from:
http://www.linear.com/ltpowerplay
To access technical support documents for LTC Power
System Management Products visit Help, View Online
help on the LTpowerPlay menu.
REAL-TIME
TELEMETRY DATA
DISPLAY OF SELECTED PARAMETER
(CONFIGURATION OR TELEMETRY)
CHIP DASHBOARD
SCOPE-LIKE
TELEMETRY WINDOW
Figure 1. Screenshot of LTpowerPlay GUI
dc980abf
3
DEMO MANUAL
DC980A/DC980B
Quick Start Procedure
The following procedure describes how to set up a DC980A, DC980B, and DC590 for demonstration purposes or to
evaluate the performance of the LTC2970.
1. Download and install LTpowerPlay: http://www.linear.com/ltpowerplay
2. The default locations of DC980A’s configuration jumpers are as follows:
JP1
ASEL0
JP2
ASEL1
JP3
GRIO_CFG
JP4
WRITEPROTECT
JP5
DAC1
TERMINATION
JP6
DAC0
TERMINATION
JP7
VDD
SOURCE
LO
LO
GND
ON
IOUT0
IOUT1
DC590
3. The default locations of DC980B’s configuration jumpers are as follows:
JP1
PHSMD
JP2
FSET
JP3
FCB
JP4
RUN1
JP5
RUN2
JP6
TRACK2
JP7
TRACK1
0
550kHz
CCM
ON
ON
EXT1
VOUT1
4. Connect the DC980A and DC980B boards using the 20-pin analog interface connector. Connect DC980A to the
DC590 USB I2C/serial controller using the supplied 14-conductor ribbon cable.
5. Connect a power supply (8V to 15V) to the DC980B’s VIN and GND turrets. Refer to Figure 2 for the connections.
NOTE: Make sure that the input voltage does not exceed 15V. Be sure JP7 on the DC980A board is set to DC590.
Figure 2. Connecting DC980A/DC980B Boards and the DC590 I2C/Serial Controller
dc980abf
4
DEMO MANUAL
DC980A/DC980B
Quick Start Procedure
6 . Connect the USB cable from the host computer to the DC590. Launch LTpowerPlay. The software automatically identifies the DC980A and builds a system tree for the LTC2970. The GUI should appear as that shown in
Figure 1.
a. Load default configuration into the LTC2970. From the pull-down menu select Demo > Demo Config.
b. Check for the LTC3828 output voltages by clicking on CHO_A_ADC_LTC2970 or CH1_A_ADC_LTC2970.
dc980abf
5
DEMO MANUAL
DC980A/DC980B
Quick Start Procedure
c. Check VDD and V12 input voltages Note: If JP7 is set to DC590 position, the V12 telemetry reading
will be ~5V.
dc980abf
6
DEMO MANUAL
DC980A/DC980B
Alternate DC980A Powering Method
The DC980A board may be powered from the input supply
that powers the DC980B board. This configuration allows
the LTC2970 to make a direct reading of VIN and display
the readback value in the V12_ADC_LTC2970 register in
LTpowerPlay. It requires an external jumper wire. Ensure
that all power is removed from both boards. On the DC980A
board, move jumper JP7 to the LOCAL position. Place a
jumper wire between the VIN turret of the DC980B and
the 12VIN turret of the DC980A. Note that the LTC2970’s
voltage range is 8V to 15V. Ensure that the DC980B is
powered by a voltage between 8V and 15V. Apply power.
Figure 3. Connecting DC980A/B Boards with VIN Jumper to 12VIN Turret
The 12V telemetry register and plot should look like this:
dc980abf
7
DEMO MANUAL
DC980A/DC980B
DC980A Details
Figure 4. DC980A Board
dc980abf
8
DEMO MANUAL
DC980A/DC980B
DC980B Details
Figure 5. DC980B Board
dc980abf
9
DEMO MANUAL
DC980A/DC980B
Parts List—DC980A
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C1
CAP CER 1µF 16V 20% X7R 0603
TDK C1608X7R1C105M
2
2
C2, C15
CAP TANTALUM 10µF 25V 20% 6032
AVX TAJW106M025R
3
2
C9, C13
CAP CER 0.1µF 16V 20% X7R 0603
AVX 0603YC104MAT
4
1
D1
DIODE, SCHOTTKY 200mW SOT-23
DIODES INC BAT54
5
1
R1
RES 10kΩ 0.1W 5% 0603 SMD
VISHAY CRCW0603103JRT6
6
1
R2
RES 100kΩ 0.1W 5% 0603 SMD
VISHAY CRCW0603100KFKEA
7
13
R3, R7 TO R11, R15,
R16, R19 TO R23
RES 0Ω 0.1W 0603 SMD
VISHAY CRCW0603000ZRT6
8
3
R4, R5, R6
RES 2kΩ 0.1W 1% 0603 SMD
VISHAY CRCW06032K00JNEA
9
3
R12, R13, R14
RES 4.99kΩ 0.1W 1% 0603 SMD
VISHAY CRCW06034K99JNEA
10
2
R17, R18
RES 6.34kΩ 0.1W 1% 0603 SMD
VISHAY CRCW06036K34JNEA
11
1
U1
IC, 2-CH POWER SUPPLY MONITOR AND MARGIN
CONTROLLER
LINEAR TECHNOLOGY LTC2970CUFD
12
1
U2
IC, 2k-Bit I2C SERIAL EEPROM
MICROCHIP 24LC025-I/ST
Additional Demo Board Circuit Components
13
0
C3, C4, C5, C8, C10 TO
C12, C14 (OPT)
OPTION - DO NOT STUFF
14
0
C6, C7 (OPT)
OPTION - DO NOT STUFF
Hardware: For Demo Board Only
15
1
J1
2MM PIN HEADER, 2x7
MOLEX 87831-1420
16
1
JP8
CONN HEADER, 2x10 RIGHT ANGLE
MILL-MAX 802-10-020-20-001
17
7
JP1 TO JP7
2MM PIN HEADER, 1x3
SAMTEC TMM-103-02-L-S
18
4
MH1 TO MH4
STANDOFF, NYLON SNAP-ON
KEYSTONE 8831
19
7
SH1 TO SH7
SHUNT FOR 2MM PIN HEADER
SAMTEC 2SN-BK-G
20
18
TP1 TO TP18
TERM SOLDER TURRET 0.219" 0.078"L
MILL MAX 2501-2-00-80-00-00-07-0
dc980abf
10
DEMO MANUAL
DC980A/DC980B
Parts List—DC980B
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
3
CB1, CB2, C12
CAP CER 0.1µF 16V 10% X7R 0603
MURATA GRM188R71C104KA01D
2
2
CIN1, CIN2
CAP CER 10µF 25V 10% X7R 1210
MURATA GRM32DR71E106KA12L
3
1
CIN3
CAP ALUM 33µF 25V 20% 6.3x6 SMD
NICHICON PCV1E330MCL1GS
4
1
COUT1
CAP ALUM POLY 150µF 6.3V 7343
PANASONIC EEF-CX0J151XR
5
1
COUT2
CAP ALUM POLY 180µF 4V 7343
PANASONIC EEF-SX0G181ER
6
2
C2, C15
CAP CER 100pF 50V 5% C0G 0603
MURATA GRM1885C1H101JA01D
7
2
C3, C16
CAP CER 470pF 50V 5% C0G 0603
MURATA GRM1885C1H471JA01D
8
3
C5, C7, C14
CAP CER 1000pF 50V 5% C0G 0603
MURATA GRM1885C1H102JA01D
9
3
C4, C10, C19
CAP CER 1µF 10V 10% X5R 0603
MURATA GRM188R61A105KA61D
10
2
C9, C13
CAP CER 1µF 25V 10% X7R 0805
TDK C2012X7R1E105K125AB
11
1
C11
CAP TANT 4.7µF 10V 0805
MURATA GRM21BR71A475KA73K
12
2
C20, C21
CAP CER 10nF 25V 10% X7R 0603
MURATA GRM188R71E103KA01D
13
2
D1, D3
SCHOTTKY DIODE 30V 0.1A SOD-323
CENTRAL SEMI CMDSH-3 TR
14
2
L1, L2
INDUCTOR, 2.2µH
WÜRTH 74437346022
15
2
Q1, Q2
MOSFET Nch DUAL PWR SW 30V 12mΩ SO8
IR IRF8313PBF
16
5
R1, R7, R11, R12, RIN1
RES 10Ω 0.1W 5% 0603
VISHAY CRCW060310R0JNEA
17
2
R2, R16
RES 10kΩ 0.1W 1% 0603 SMD
VISHAY CRCW0603103JRT6
18
2
R3, R18
RES 100kΩ 0.1W 1% 0603 SMD
VISHAY CRCW0603100KFKEA
19
2
R4, R10
RES 42.2kΩ 0.1W 1% 0603 SMD
VISHAY CRCW060349K2FKEA
20
3
R5, R20, R21
RES 20kΩ 0.1W 1% 0603 SMD
VISHAY CRCW060320K0FKEA
21
1
R6
RES 105kΩ 0.1W 1% 0603 SMD
VISHAY CRCW0603105KFKEA
22
2
R13, R26
RES 30.1kΩ 0.1W 1% 0603 SMD
VISHAY CRCW060330K1FKEA
23
2
R14, R24
RES 95.3kΩ 0.1W 1% 0603 SMD
VISHAY CRCW060395K3FKEA
24
2
R19, R22
RES 8.2kΩ 0.1W 5% 0603 SMD
VISHAY CRCW06038K20FKEA
25
1
R27
RES 1kΩ 0.1W 5% 0603 SMD
VISHAY CRCW06031K00JNEA
26
1
R28
RES 147kΩ 0.1W 1% 0603 SMD
VISHAY CRCW0603147KFKEA
27
1
R29
RES 196kΩ 0.1W 1% 0603 SMD
VISHAY CRCW0603196KFKEA
28
2
RSENS1, RSENS2
RES 0.01Ω 0.5W 1% 1206
STACKPOLE CSR1206FK10L0
29
1
U1
IC, 2-CH STEP DOWN CONTROLLER QFN28
LINEAR TECHNOLOGY LTC3828EUH
dc980abf
11
DEMO MANUAL
DC980A/DC980B
Parts List—DC980B
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
30
0
C6, C17 (OPT)
CAP CER 180PF NPO 5% 0603 (OPT)
DO NOT INSTALL
31
0
C22 (OPT)
CAP CER 10nF 25V 10% X7R 0603 (OPT)
DO NOT INSTALL
32
0
D4, D2 (OPT)
DIODE, POWERMITE (OPT)
DO NOT INSTALL
33
0
D5 (OPT)
DIODE, SOT-323 (OPT)
DO NOT INSTALL
34
0
Q3, Q4 (OPT)
MOSFET Nch DUAL PWR SW 30V SO8 (OPT)
DO NOT INSTALL
35
0
Q5, Q6 (OPT)
MOSFET Nch DUAL PWR SW 30V SO8 (OPT)
DO NOT INSTALL
36
0
R8, R9, R23, R25 (OPT)
RES USER SELECTABLE 0603 (OPT)
DO NOT INSTALL
37
4
R15, R17, R30, R31
RES 0Ω 0.1W 0603 SMD
VISHAY CRCW0603000ZRT6
38
4
R32 TO R35
RES 10Ω 1/16W 5% 0603
PANASONIC ERJ-3EKF10R0V
Hardware: For Demo Board Only
39
7
E1, E2, E5, E7,
E12 TO E14
TERM SOLDER TURRET 0.156"H 0.084"L
MILL MAX 2308-2-00-80-00-00-07-0
40
6
E4, E6, E8 TO E11
TERM SOLDER TURRET 0.219" 0.078"L
MILL MAX 2501-2-00-80-00-00-07-0
41
7
JP1 TO JP7
2MM PIN HEADER 1X3
WÜRTH 620 003 111 21
42
1
JP8
CONN RECEPT, 2x10 RIGHT ANGLE
MILL-MAX 803-93-020-20-001
43
4
MH1 TO MH4
STANDOFF, NYLON SNAP-ON
KEYSTONE 8831
44
7
SH1 TO SH7
SHUNT FOR 2MM PIN HEADER
WÜRTH 608 002 134 21
dc980abf
12
D
C
B
A
GPIO_1
GPIO_0
GPIO_CFG
19
17
15
13
11
9
7
5
3
1
1
20
18
16
14
12
10
8
6
4
2
ANALOG
INTERFACE
JP8
(0 - 6 V)
(0 - 6 V)
TP8
(0 - 6 V)
VIN0B-
VIN1A+
VIN1A-
TP7
TP6
(8 - 15V)
12VIN
VOUT1
VOUT0
(0 - 6 V)
2
TP18
TP16
TP12
TP10
TP9
(0 - 6 V)
VIN1B-
VIN1B+
(0 - 6 V)
VIN0B+
TP5
(0 - 6 V)
VIN0A-
TP4
(0 - 6 V)
TP3
TP2
VIN0A+
GND
VDD 4.5 - 5.75V
TP1
R20
0
R19
0
R16
0
R15
0
R11
0
R8
0
R7
0
R3
0
C15
10uF
VDD
+
C14
C12
C11
C10
C8
C5
C4
C3
[option]
[option]
[option]
[option]
[option]
[option]
[option]
[option]
3
3
BAT54
D1
HI
1uF
VIN1_B+
VIN1_A-
VIN1_A+
VIN0_B-
VIN0_B+
VIN0_A-
VIN0_A+
JP1
LO
0.1uF
C13
VDD
LTC2970CUFD
7
IN1B-
IN1B+
6
5
IN1A+
IN1A-
4
IN0B-
2
3
1
IN0AIN0B+
IN0A+
U1
C1
1
ASELO
2
24
25
GND
8
3
ASEL0
1
4
JP2
LO
4
3
R21
0
R22
0
IOUT1
IOUT0
GPIO_1
GPIO_0
ALERT
SCL
SDA
2
JP5
R17
GND
IOUT1
6.34K
1
HI
100K
R2
VDD
DAC 1
TERMINATION
13
14
15
16
17
18
19
R1
10K
VDD
GPIO_CFG
HI
ASEL1
ASEL0
12VIN
22
ASEL1
10
23
REF
VIN1_B-
REF_GND
VDD
9
2
20
ASEL1
VOUT0
11
21
GPIO_CFG
VOUT1
12
2
R18
GND
IOUT0
6.34K
R4
2K
5
DO NOT SCALE DRAWING
THIRD ANGLE PROJECTION
C7
[option]
[option]
SCL
SDA
10/25/05
DRAWN Chris Pollard
SCL
WP
VCC
6
REVISION HISTORY
DESCRIPTION
ON
OFF
JP4
WRITE-PROTECT
R13
4.99K
+
IOUT1
IOUT0
ALERTB
GPIO_0
GPIO_1
10/25/05
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
R14
4.99K
TECHNOLOGY
2
R12
4.99K
C2
10uF
R23
0
8
DATE
7
FILENAME: 980A.DSN
DWG NO
SHEET
DC980A
8
1
MONITOR AND MARGIN CONTROLLER
SCH, LTC2970CUFD, DUAL POWER SUPPLY
5
6
7
8
SIZE CAGE CODE
TITLE
VSS SDA
A2
A1
A0
7
TYPO CORRECTIONS AND PARTS MADE OPT.
Tuesday, December 06, 2005 SCALE:NONE
DESIGNER
ENGINEER
APPROVED
CHECKED
DATE
4
3
2
R9
0
R10
0
VIO
2
REV
U2
24LC025
0.1uF
1
APPROVALS
ECO
C9
DC590A
LOCAL
VDD
C6
CONTRACT NO.
R6
2K
JP7
6
VDD SOURCE 2
R5
2K
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
DAC 0
TERMINATION
2
JP6
GPIO_CFG
JP3
3
GND
5
(option)
2
3
1
(option)
3
1
1
3
1
3
1
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
Customer Notice:Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications;
however, it remains the customers 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
Applications Engineering for assistance.
2
I C
PORT
J1
OF
IOUT1
TP17
IOUT0
TP15
1
REV
2
ALERTB
TP14
GPIO_0
TP13
GPIO_1
TP11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
APPROVED
D
C
B
A
DEMO MANUAL
DC980A/DC980B
Schematic Diagram
dc980abf
13
A
B
C
DCM
CCM
JP3
FCB
550KHz
250kHz
R18
100K
VIN
E13
TRACEXT1
2
R27
1K
E7
PLLIN/FCB
PHSMD
ON
OFF
ON OFF
1
R19
8.2K
C21
0.01uF
5
R25
opt.
R23
opt.
TRCKSS1
VOUT2
JP6 VOUT2
TRACK2
3
EXT1
1
3
JP5
R21
20K
R20
20K
2
RUN2
JP4
RUN1
C20
0.01uF
R16
10K
E2
E1
C7
1000pF
TRCKSS1
JP2
FSET
2
R3
100K
INTVCC
3
D
3
1
3
1
CLKOUT
2
1
2
14
1
1
R6
8.2K
R22
C17
opt.
E14
TRACEXT2
196K 1%
1
R11
10
C14
1000pF
4
R8
opt.
C22
opt.
R26
30.1K
4
9
8
13
12
11
10
7
6
5
3
2
1
32
31
30
NC
NC
VOSENSE2
ITH2
SENSE2+
SENSE2-
TRCKSS2
SGND
FCB/PLLIN
RUN1
PLLFLTR
4
PGOOD
RUN2
BOOST2
TG2
SW2
BG2
PGND
BG1
INTVCC
DRVCC
VIN
SW1
TG1
BOOST1
CLKOUT
PHSMD
VOSENSE1
SENSE1-
SENSE1+
ITH1
TRCKSS1
U1
LTC3828EUH
29
R12
10
R24 TRCKSS2
95.3K
VOUT1
3
JP7
VOUT1
TRACK1
EXT2
R14
95.3K 1%
R10 42.2K
R13
470pF
C16
opt.
10
R7
C5
1000pF
R1
10
TRCKSS2
30.1K 1%
R29
100pF
opt.
R9
105K 1%
C6
C15
147K 1%
0
R4 42.2K
2
20K 1%
R28
R5
C3
470pF
C2
100pF
3
JP1
PHSMD
0
R15
2
5
14
15
16
17
18
20
19
22
21
23
24
25
26
28
27
10K
R2
0
BG2
4
3
56
56
3
L1
3
78
78
2.2uH
L2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
0.008
RSENS2
D4
opt.
CIN1
10uF
25V
D2
opt.
0.007
RSENS1
2
Chris Pollard
10/25/05
DATE
DESIGNER
2
5V/5A
E9
GND
FILENAME:
SIZE CAGE CODE
SCALE:
TECHNOLOGY
0
ANALOG
INTERFACE
2
4
6
8
10
12
14
16
18
20
JP8
1
3
5
7
9
11
13
15
17
19
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
1
DWG NO
1
SHEET
DC980B
1
Dual Output Step-Down DC/DC with Tracking
LTC3828EUH
10
R31
VOUT2
3.3V/5A
GND
R35
E11
0
VIN
7V to 21V
R30
GND
E8
E6
10
R33
VOUT1
E10
C19
1.0uF
VOUT2
TITLE
R34
10
E4
C4
1.0uF
+ CIN3
33uF
35V
VIN
+ COUT2
220uF
4V
CIN2
10uF
25V
R32
VOUT1
10
+ COUT1
220uF
6.3V
ENGINEER Andy Gardner 10/25/05
APPROVED
CHECKED
DRAWN
APPROVALS
CONTRACT NO.
Q2
IRF8313PBF
2
1.0uF
25V 1
C13
25V
C9
1
1.0uF
2
Q1
IRF8313PBF
2.2uH
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
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
TG2
10
C12
0.1uF
RIN1
4
TG1 BG1
CMDSH-3
D1
opt.
D5
D3
CMDSH-3
CB2
0.1uF
+ C11
4.7uF
10V
INTVCC
CB1
0.1uF
E5
PGOOD
INTVCC
SW2
SW1
C10
1.0uF
R17
E12
DRVCC
3
OF
2
REV
2
A
B
C
D
DEMO MANUAL
DC980A/DC980B
Schematic Diagram
dc980abf
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.
A
B
C
D
5
5
4
4
123
Q5
HAT2165H
4
4
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
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
Chris Pollard
DATE
10/25/05
3
Wednesday, October 26, 2005
DESIGNER
ENGINEER Andy Gardner 10/25/05
APPROVED
CHECKED
DRAWN
APPROVALS
CONTRACT NO.
123
SCALE:
2
TECHNOLOGY
2
FILENAME:
DWG NO
1
SHEET
DC980B
2
1
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
Dual Output Stepdown DC/DC with Tracking
LTC3828EUH
SIZE CAGE CODE
TITLE
Q6
HAT2165H
5678
5678
SW2
Q4
HAT2168H
5678
VIN
123
BG2
4
3
123
SW1
TG2
Optional Circuit
Q3
HAT2168H
5678
CUSTOMER NOTICE
BG1
TG1
VIN
4
OF
2
REV
2
A
B
C
D
DEMO MANUAL
DC980A/DC980B
Schematic Diagram
dc980abf
15
DEMO MANUAL
DC980A/DC980B
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
dc980abf
16 Linear Technology Corporation
LT 0915 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015