DC506A - Demo Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
LTC3251EMSE
DESCRIPTION
Demonstration circuit 506A is a two-phase,
step down charge pump DC/DC converter
featuring the LTC3251EMSE. It produces regulated 1.5V output voltage at up to 500mA of
output current from 3.2V to 5.5V input. A
unique two phase, spread spectrum architecture of the LTC3251 provides highly efficient
and low noise operation. The burst and superburst operating modes also reduce operating
current at light load conditions. The circuit has
a low external parts count and requires only
four small surface mount capacitors. DC 506
demonstrates appropriate layout techniques
for the LTC3251 Inductorless DC-DC converter.
This power supply circuit is ideally suited for
space-constrained battery-powered applications that require small size and low operating
current.
Design files for this circuit board are available.
Call the LTC factory.
QUICK START PROCEDURE
Demonstration circuit DC506 is easy to set up
to evaluate the performance of the LTC3251.
Refer to Figure 1 for proper measurement
equipment setup and follow the procedure
below:
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 2 for
proper scope probe technique.
1. With
power off, connect input power
source to VIN and GND terminals. Input
voltage range is limited to between 3.2V
and 5.5V.
2. Place operation mode selector jumper JP1
in the GND position, JP2 in the VIN position
for Burst Mode operation.
3. Connect load between the VOUT and GND
terminals.
4. Turn on the power at the input.
NOTE: Make sure that the input voltage does
not exceed 5.5V.
5. Check for the proper output voltages. VOUT
= 1.5V.
If there is no output, temporarily disconnect
the load to make sure that the load is not
set too high.
6. Once
the proper output voltages are
established, adjust the loads up to 500mA
and observe the output voltage regulation,
input and output ripple voltage, efficiency
and other parameters.
NOTE: IOUT derates linearly to 200mA for VIN
less than 3.5V.
7. For continuous mode operation, set opera-
tion mode selector jumper JP1 in the VIN
position, JP2 in the GND position. Please refer Table1 for other modes of operation.
Table 1. Modes of Operation:
JP1
JP2
MODE
GND
GND
SHUTDOWN
GND
VIN
BURST
VIN
GND
CONTINUOUS
VIN
VIN
SUPER BURST
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
–
+
+
+
+
–
+
–
–
–
+
LOAD
–
F
Figure 4. Input Ripple
(VIN = 3.5V, IOUT = 500mA), 20MHz Bandwidth
GND
VIN
Figure 1. Proper Measurement Equipment Setup
Figure 2. Scope Probe Placement for
Measuring Input or Output Ripple
Figure 5. 1.5V Output Ripple
(VIN = 3.5V, IOUT = 500mA), 20MHz Bandwidth
F
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
3
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
4
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
APPROVED VENDOR LIST
VENDOR
AAC (was TAD)
AAC (was TAD)
AAVID
ALLEN BRADLEY
AMP
APEM
API DELEVAN
AVX
AVX
AVX
AVX
BERG
BH ELECTRONICS
BI TECHNOLOGIES
BI TECHNOLOGIES
BOURNS
CADDOCK ELECTRONICS
CENTRAL SEMI
CHICAGO MINIAT. LAMP
COILCRAFT
COMM CON
CONNEX
COOPER ELECT. TECH.
CORNELL DUBILIER
CTS
CUI-STACK
DALE (see Vishay)
DALE (see Vishay)
DATA DISPLAY PRODUCT
DIODES INC.
ELECTRONIC CONCEPTS
EPSON
FAIRCHILD
FAIRCHILD
FAIRCHILD
FCI
FUKUSHIMA
FUJI
GENERAL SEMICONDUCTOR
GOWANDA
GRAYHILL
HARRIS
HEWLETT PACKARD
HITACHI
PHONE NUMBER
(800) 508-1521
(714) 255-9186
(714) 556-2665
(800) 592-4888
(717) 564-0100
(718) 246-1007
(716) 652-3600
(843) 946-0362
(843) 946-0524
(207) 282-5111
(843) 946-0323
(800) 237-2374
(952) 894-9590
(714) 447-2656
(714) 447-2345
(801) 750-7253
(541) 496-0700
(631) 435-1110
(201) 489-8989
(847) 639-6400
(626) 301-4200
(805) 378-6464
(561) 752-5000
(508) 996-8561
(219) 293-7511
(503) 643-4899
(605) 665-1627
(605) 665-9301
(800) 421-6815
(805) 446-4800
(908) 542-7880
(310) 787-6300
(207) 775-4502
(408) 822-2126
(888) 522-5372
(717) 767-8005
(818) 765-8300
(201) 712-0555
(516) 847-3000
(716) 532-2234
(708) 354-1040
(800) 442-7747
(800) 235-0312
(408) 433-1990
PART TYPE
WEBSITE ADDRESS
CHIP RESISTORS
HEAT SINKS
CARBON RESISTORS
PC MOUNT BNC
SMD TOGGLE/PB SWITCH
INDUCTORS
CHIP CAPS
CHIP RESISTORS
TANTALUM CAPS
HIGH VOLTAGE CAPS
CONNECTORS
INDUCTORS
TRANSFORMERS
RES./RES. NETWORKS
POTENTIOMETERS, SIPS
HIPO. RES., SIPS, DIPS
SMALL SIGNAL DISCRETES
LEDS
INDUCTORS
HEADERS, SHUNTS
BNC CONNECTORS
INDUCTORS
CAPACITORS
RESISTOR ARRAYS
POWER CONNECTORS
INDUCTORS
SENSE RESISTORS
LEDS
DIODES
400V FILM CAPACITORS
CRYSTALS
LOGIC
MOSFETS
CRG (CUST. RESPONSE)
HOT PLUG CONNECTORS
MPC RESISTORS
SCHOTTKY DIODES
DIODES
INDUCTORS
DIP SWITCHES
LOGIC
IR LED
RF POWER AMPS
5
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
IDT
IR
IRC
ITW PAKTRON
JOHNSON COMPONENTS
JOHNSON COMPONENTS
KEMET
KEMET
KETEMA
KEYSTONE
LITEON
LTC
MAGNETICS
MARCON
METHODE
MF ELECTRONICS
MICROCHIP
MICRO PLASTICS
MICRO-SEMI
MIDCOM
MIDCOM
MILL-MAX
MINICIRCUITS
MOTOROLA
MURATA ELECTRONICS
MURATA ELECTRONICS
MURATA ELECTRONICS
NEC/TOKIN
NICHIA
NICHICON
ON SEMICONDUCTOR
ON SHORE
PANASONIC
PANASONIC
PANASONIC
PERICOM
PHILIPS
PHILIPS
PHILIPS
PULSE
QT OPTOELECTRONICS
RAYCHEM
RG ALLEN
RF MICRO DEVICES
SAMTEC
SANYO
SCHOTT
(408) 727-6116
(310) 322-3331
(361) 992-7900
(708) 667-3444
(650) 948-6533
(760) 434-5961
(408) 986-0424
(864) 963-6300
(714) 630-0081
(718) 956-8900
(408) 241-4588
(408) 432-1900
(800) 245-3984
(847) 696-2000
(800) 323-6864
(914) 576-6570
(602) 786-7200
(870) 453-8861
(617) 926-0404
(605) 886-4385
(800) 643-2661
(516) 922-6000
(718) 934-4500
(800) 441-2447
(770) 436-1300
(800) 831-9172
(770) 433-5789
(510) 324-4110
(408) 573-0933
(847) 843-7500
(602) 244-6600
(602) 921-3000
(714) 373-7334
(201) 348-5217
(201) 373-7334
(408) 435-0800
(914) 246-2811
(914) 247-2036
(508) 851-2200
(619) 674-8100
(408) 720-1440
(800) 227-4856
(818) 765-8300
(336) 664-1233
(800) 726-8329
(619) 661-6835
(507) 532-3201
LOGIC IC
MOSFETS
SENSE RESISTORS
CAPACITORS
RF CONNECTORS
RF CONNECTORS
TANTALUM CAPS
CRG (CUST. RESPONSE)
SURGE SUPPRESSORS
JACKS, TURRETS
LEDS, DIODES
HIGH PERF. I.C.S
TOROID CORES ETC.
HIGH C/V CAPACITORS
ZIF SOCKETS
CRYSTAL OSCILLATORS
MICROCONTROLLER IC
NYLON STANDOFFS
DIODES
INDUCTORS
INDUCTORS
TURRETS
RF TRANSFORMERS
LOGIC, REGS
CAPS., INDUCTORS,
CRG (CUST. RESPONSE)
RF DEVICES
INDUCTORS/HI C/V CAPS
WHITE LEDS
ELECTROLYTIC CAPACITOR
DISCRETE DIODES ETC.
TERMINATORS
INDUCTORS, POLY CAPS
LEDS
SWITCHES
LOGIC IC
INDUCTORS
PLANAR INDUCTORS
DISCRETES, I.C.s
INDUCTORS
RF SWITCH
FUSES
METAL OXIDE RESISTORS
RF2138 / RF2140
WIRE JUMPERS
OSCON CAPS
INDUCTORS, XFORMERS
6
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
SCHURTER
SIGNATRON
SIEMENS
SILICONIX
SILICONIX
SPRAGUE
SULLINS
SUMIDA
SUMIDA
TAIYO YUDEN
TAIYO YUDEN
TEKTRONIX
TEMIC
THERMALLOY
THIN FILM TECHNOLOGY
TOCOS
TOKIN (NEC)
TOKO
TOSHIBA
TOSHIBA
UNITED CHEMICON
VISHAY
VISHAY
VITRAMON
WIMA
ZETEX
ZIERICK
(707) 778-6311
(909) 464-1883
(108) 257-7910
(800) 554-5565
(408) 988-8000
(207) 324-4140
(760) 744-0125
(847) 956-0667
(408) 982-9660
(408) 573-4150
(800) 348-2496
(800) 835-9433
(408) 970-5700
(972) 243-4321
(507) 625-8445
(847) 884-6664
(510) 324-4110
(847) 699-3430
(714) 455-2000
(949) 455-2000
(847) 696-2000
(605) 665-9301
(605) 665-9301
(203) 268-6261
(914) 347-2474
(631) 366-5068
(800) 882-8020
FUSES AND HOLDERS
DB9 CONNECTORS
OPTO
MOSFETS
MOSFETS
CAPACITORS
HEADERS, SHUNTS
INDUCTORS
INDUCTORS
CHIP CAPS / RES.
CRG (CUST. RESPONSE)
SCOPE PROBE SOCKETS
IR PHOTO DIODE
HEAT SINKS
THIN FILM CHIP RESISTORS
SMD POTENTIOMETERS
CAPS., INDUCTORS,
RF PRODUCTS
SINGLE GATE LOGIC
LOGIC
ELECTROLYTIC CAPACITOR
ZENER/SM. SIGNAL DIODES
INDUCTORS, SENSE Rs
CERAMIC CHIP CAPACITOR
PAPER/FILM CAPACITORS
SMALL SIGNAL DISCRETES
STAKED PINS
7
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
8
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 506
500MA SPREAD-SPECTRUM,LOW NOISE,INDUCTORLESS STEP DOWN DC/DC CONVERTER
9
5
4
3
2
1
D
D
GND
VIN
3
CIN2
1uF 10V
0603
JP1
2
GND
JP2
2
R3
10M
1
GND
CIN1
10uF,6.3V
0805
E3
MD0
GND
R4
10M
U1
C
MD0
MD0
1
VIN
2
C1+
3
C1-
4
C1
1uF 10V
0603
5
MD0
VIN
C1+
C1GND
VIN
1
E2
VIN
3
VIN
3.2V-5.5V
E1
R1
536K
1%
FB
FB 10
MD1
MD1 9
C2+
C2+ 8
VOUT
VOUT 7
C2C2- 6
R2
475K
1%
C
C3
4.7pF
MD1
VOUT
C2
1uF 10V
0603
LTC3251EMSE
COUT1
10uF 6.3V
1206
COUT2
1uF 6.3V
0603
GND
E5
MD1
E6
VOUT=1.5V
IOUT=500mA
*
E7
GND
B
B
DERATES LINEARLY TO 200mA
* IOUT
FOR VIN LESS THAN 3.5V
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE INOHMS, 0402.
ALL CAPACITORS ARE IN MICROFARADS, 0402.
2. INSTALL SHUNTS ON JP1 AND JP2 PIN 2AND 3.
3. THE MODES OF OPERATION:
A
CONTRACT NO.
APPROVALS
JP1
JP2
MODE
GND
VIN
GND
VIN
GND
GND
VIN
VIN
SHUTDOWN
BURST
CONTINUOUS
SUPER BURST
DRAWN:
TECHNOLOGY
KIM T.
CHECKED:
TITLE:
SCHEMATIC
SIZE
DWG NO.
APPROVED:
ENGINEER:
RAYMOND Z.
DESIGNER:
4
3
A
500mA SPREAD-SPECTRUM, LOW NOISE,
INDUCTORLESS STEP DOWN DC/DC CONVERTER
A
DATE:
5
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Friday, August 23, 2002
2
REV
DC506A - LTC3251EMSE
SHEET 1
1
A
OF
1
BILL OF MATERIALS
DC506A
Linear Technology Corporation
LTC3251EMSE
6/17/2005
12:54 PM
500mA SPREAD-SPECTRUM, LOW NOISE,
INDUCTORLESS STEP DOWN DC/DC CONVERTER
ENG: RAYMOND Z.
Item Qty Reference
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
3
1
1
1
6
2
2
1
1
2
1
4
4
Part Description
CIN1
CAP., X5R 10uF 6.3V, 0805
C1,C2,CIN2
CAP., X5R 1uF 10V,0603
COUT1
CAP., X5R 10uF 6.3V,1206
COUT2
CAP., X5R 1uF 6.3V,0603
C3
CAP., NPO 4.7pF 50V,0402
E1,E2,E3,E5,E6,E7
TP, TURRET, .094"
JP1,JP2
JMP, 1X3 PINS, .079
SHUNTS FOR JP1 AND JP2 SHUNT, 2 PINS, .079"
R1
RES, 536K 1%, 0402
R2
RES, 475K 1%, 0402
R3,R4
RES, 10M 5%, 0402
U1
IC, LTC3251EMSE, MSE10
MTG HOLES AT 4 CORNERS STANDOFF, NYLON HEX #4-40 x 1/4"
SCREW, #4-40 x 1/4
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402.
2. INSTALL SHUNTS ON JP1 AND JP2 PIN 2 AND 3.
3. INSTALL 4 STANDOFF COMPONENTS ON BOTTOM SIDE.
Page 1 - of - 1
Manufacture / Part #
TAIYO YUDEN, JMK212BJ106MG
TAIYO YUDEN, LMK107BJ105MA
TAIYO YUDEN, JMK316BJ106ML
TAIYO YUDEN, JMK107BJ105MA
AVX, 04025A4R7CAT
MILL-MAX, 2501-2
COMM CON, 2802S-03G2
COMM CON, CCIJ2mm-138G
AAC, CR05-5363FM
AAC, CR05-4753FM
AAC, CR05-106JM
LINEAR TECH., LTC3251EMSE
MICRO PLASTICS, #14HTSP101
ANY
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