DC2003A -Demo Manual

DEMO MANUAL DC2003A
LTC3622EDE
17V, Dual 1A, Synchronous Step-Down Regulator
with Ultralow Quiescent Current
Description
Demonstration circuit 2003A is a synchronous step-down
regulator using the power-saving LTC3622EDE monolithic
buck regulator in a compact 14-pin DFN (4mm × 3mm)
package. The DC2003A operates from an input voltage
range of 2.7V to 17V and provides dual 1A outputs with
an adjustable output voltage range from 1.2V to 5V. The
LTC3622 IC quiescent current can be as low as 5µA in
Burst Mode® operation with both channels enabled and less
than 0.1µA in shutdown mode. The switching frequency is
fixed to 1MHz or 2.25MHz with a ±50% synchronization
range to an external clock. A user-selectable mode input
is provided to allow the user to trade off ripple noise for
Performance Summary
PARAMETER
light load efficiency. Burst Mode operation provides the
highest efficiency at light loads, while pulse-skipping mode
provides the lowest ripple noise.
It is recommended to read the data sheet LTC3622 with
this demo manual prior to working on or making any
changes to DC2003A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Specifications are at TA = 25°C
CONDITIONS
VALUE
Default IC
LTC3622EDE
Default Switching Frequency
1MHz
Default Operation Mode
Burst Mode Operation
Input Voltage Range
2.7V to 17V
Onboard User Selectable Output Voltages
VIN = 2.7V to 17V, IOUT1 = IOUT2 = 0A to 1A
(VOUT ≤ VIN)
VOUT1 = 3.3V
VOUT2 = 5V
Default Output Voltage
Per Channel Maximum Continuous Output
Current
VOUT1: 1.2V, 1.8V, 2.5V, 3.3V
VOUT2: 1.5V, 1.8V, 3.3V, 5V
VIN = 2.7V to 17V
IOUT1 = IOUT2 = 1A
Efficiency, VOUT1 (Burst Mode Operation)
VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A
88.2% (See Figure 3)
Efficiency, VOUT2 (Burst Mode Operation)
VIN = 12V, VOUT2 = 5.V, IOUT2 = 1A
90.8% (See Figure 4)
Output Voltage Ripple, VOUT1
VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A
<5.9mVP-P (See Figure 5)
Output Voltage Ripple, VOUT2
VIN = 12V, VOUT2 = 5V, IOUT2 = 1A
<7.8mVP-P (See Figure 6)
Load Transient Response, VOUT1
VIN = 12V, VOUT1 = 3.3V, IOUT1 = 100mA to 1A
See Figure 7
Load Transient Response, VOUT2
VIN = 12V, VOUT2 = 5V, IOUT2 = 100mA to 1A
See Figure 8
Thermal Image
VIN = 12V, VOUT1 = 3.3V, VOUT2 = 5V, IOUT1 = IOUT2 = 1A
See Figure 9
dc2003af
1
DEMO MANUAL DC2003A
Quick Start Procedure
Demonstration circuit 2003A is easy to set up to evaluate
the performance of the LTC3622. Please refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
1.Place jumpers in the following positions:
Table 1. Jumper Selection
JP1
JP2
JP3
JP4
JP5
RUN1
RUN2
MODE/SYNC
PHASE
ILIM
ON
ON
BURST
180°
1A
2.Place VO1 SELECT jumper in 3.3V position (JP9) and
VO2 SELECT jumper in 5V position (JP14).
3.With power off, connect the input power supply at VIN1
and GND.
4.Connect the Loads between VOUT1 and GND, VOUT2 and
GND. Preset the loads to 0A.
5.Connect the DMMs to the input and output to monitor
the input voltage and output voltages.
6.Turn on the power supply at the input. The RUN1 and
RUN2 pin jumpers should be at ON position. Measure
and make sure the input supply voltage is 12V. The
output voltage VOUT1 should be 3.3V±1%, and VOUT2
should be 5V±1%.
7.Once the input and output voltages are properly established adjust the loads within the operating range (0A
to 1A max) and observe the output voltage regulations,
output ripple voltages, switch node wave-forms and
other parameters. Refer to Figure 2 for proper input/
output voltage ripple measurement.
8.To select other output voltages, use the on board user
selectable output voltage jumpers. Shutting down
LTC3622 by placing RUN1 and RUN2 pin jumpers to
the OFF position or turn off the input power supply.
Refer to the following tables (Table 2 and Table 3) for
the output voltage selections and repeat step 3 to 6:
Table 2. VOUT1 Jumper Selection
JP6
JP7
JP8
JP9
JP10
1.2V
1.8V
2.5V
3.3V
*USER SELECT
Table 3. VOUT2 Jumper Selection
JP11
JP12
JP13
JP14
JP15
1.5V
1.8V
3.3V
5V
*USER SELECT
*Note: If JP10 or JP15 is selected, R5 or R15 needs to be calculated and inserted to obtain the desired output voltage.
Note 1: To measure the input/output voltage ripple properly, do not use the long ground lead on the oscilloscope
probe. See Figure 2 for the proper scope probe technique.
Short, stiff leads need to be soldered to the (+) and (–)
terminals of an output capacitor. The probe’s ground ring
needs to touch the (–) lead and the probe tip needs to
touch the (+) lead.
Note 2: DC2003A can also be used to evaluate
LTC3622EDE-2 (2.25MHz) by simply changing U1 to
LTC3622EDE-2, L1 to 1µH (Coilcraft XFL4020-102ME)
and L2 to 2.2µH (Coilcraft XFL4020-222ME).
dc2003af
2
DEMO MANUAL DC2003A
Quick Start Procedure
Figure 1. Proper Equipment Measurement Setup
+
VOUT
–
COUT
GND
Figure 2. Scope Probe Placements for Measuring Input or Output Ripple
dc2003af
3
DEMO MANUAL DC2003A
Quick Start Procedure
100
90
EFFICIENCY (%)
80
70
60
50
40
BURST MODE OPERATION
PULSE-SKIPPING MODE
30
20
0.0001
0.001
0.01
LOAD CURRENT (A)
0.1
1
DC2003A F03
Figure 3. VOUT1 Measured Efficiency at VIN = 12V, VOUT1 = 3.3V, L1 = 3.3µH,
FSW = 1MHz (with VOUT2 OFF)
100
90
EFFICIENCY (%)
80
70
60
50
40
BURST MODE OPERATION
PULSE-SKIPPING MODE
30
20
0.0001
0.001
0.01
LOAD CURRENT (A)
0.1
1
DC2003A F04
Figure 4. VOUT2 Measured Efficiency at VIN = 12V, VOUT2 = 5V, L2 = 4.7µH,
FSW = 1MHz (with VOUT1 OFF)
dc2003af
4
DEMO MANUAL DC2003A
Quick Start Procedure
20MHz BW LIMIT
VOUT1
10mV/DIV
DC2003a F05
t(2µs/DIV)
Figure 5. VOUT1 Measured Output Voltage Ripple at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A, FSW = 1MHz
20MHz BW LIMIT
VOUT2
10mV/DIV
t(2µs/DIV)
DC2003a F06
Figure 6. VOUT2 Measured Output Voltage Ripple at VIN = 12V, VOUT2 = 5V, IOUT2 = 1A, FSW = 1MHz
dc2003af
5
DEMO MANUAL DC2003A
Quick Start Procedure
VOUT1
200mV/DIV
IOUT1: 100mA-1A
IOUT1
0.5A/DIV
t(100µs/DIV)
DC2003a F07
Figure 7. Load Transient Response at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 100mA-1A, FSW = 1MHz, Burst Mode Operation
VOUT2
200mV/DIV
IOUT2: 100mA-1A
IOUT2
0.5A/DIV
t(100µs/DIV)
DC2003a F08
Figure 8. Load Transient Response at VIN = 12V, VOUT2 = 5V, IOUT2 = 100mA-1A, FSW = 1MHz, Burst Mode Operation
dc2003af
6
DEMO MANUAL DC2003A
Quick Start Procedure
DC2003a F09
Figure 9. Thermal Performance at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A, VOUT2 = 5V, IOUT2 = 1A, FSW = 1MHz, No Airflow
dc2003af
7
DEMO MANUAL DC2003A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
2
CFF1, CFF2
CAP, 0402 22pF 5% 50V NPO
AVX 04025A220JAT2A
2
2
CIN1, CIN2
CAP, 7343 22µF 20% 35V TANT
AVX TPSY226M035R0200
3
2
C1, C2
CAP, 1206 47µF 20% 16V X5R
TDK C3216X5R1C476M160AB
4
2
C5, C6
CAP, 1206 10µF 20% 25V X5R
TDK C3216X5R1E106M
5
1
C7
CAP, 0402 1µF 20% 10V X5R
TDK C1005X5R1A105M
6
1
L1
IND, 3.3µH 20%
COILCRAFT XFL4020-332MEC
7
1
L2
IND, 4.7µH 20%
COILCRAFT XFL4020-472MEC
8
2
RPG1, RPG2
RES, 0402 100kΩ 1% 1/16W
VISHAY CRCW0402100KFKED
9
3
RSET1, R1, RSET2
RES, 0402 619kΩ 1% 1/16W
VISHAY CRCW0402619KFKED
10
2
R2, R12
RES, 0402 309kΩ 1% 1/16W
VISHAY CRCW0402309KFKED
11
1
R3
RES, 0402 196kΩ 1% 1/16W
VISHAY CRCW0402196KFKED
12
2
R4, R13
RES, 0402 137kΩ 1% 1/16W
VISHAY CRCW0402137KFKED
13
1
R6
RES, 0805 0Ω JUMPER
VISHAY CRCW08050000Z0ED
14
2
R7, R8
RES, 0402 0Ω JUMPER
VISHAY CRCW04020000Z0ED
15
1
R11
RES, 0402 412kΩ 1% 1/16W
VISHAY CRCW0402412KFKED
16
1
R14
RES, 0402 84.5kΩ 1% 1/16W
VISHAY CRCW040284K5FKED
17
1
U1
IC, DUAL SYNCHRONOUS STEP-DOWN CONVERTER
LINEAR TECHNOLOGY LTC3622EDE
Additional Demo Board Circuit Components
1
0
C3, C4
CAP, 0402 OPTION
OPTION
2
0
R5, R15
RES, 0402 OPTION
OPTION
Hardware: For Demo Board Only
1
12
E1, E2, E3, E4, E5, E6, E7, E8,
E9, E10, E11, E12
TURRET
MILL-MAX 2501-2-00-80-00-00-07-0
2
2
JP1, JP2
HEADER, 3PIN, 2mm
SULLINS NRPN031PAEN-RC
3
2
JP3, JP5
HEADER, 3PIN, DBL ROW 2mm
SULLINS NRPN032PAEN-RC
HEADER, 2mm DBL ROW (2X2) 4PIN
4
1
JP4
5
10
JP6, JP7, JP8, JP9, JP10, JP11, HEADER, 2PIN, 2mm
JP12, JP13, JP14, JP15
SULLINS NRPN021PAEN-RC
6
7
XJP1, XJP2, XJP3, XJP4, XJP5, SHUNT, 2mm
XJP6, XJP13
SAMTEC 2SN-BK-G
7
4
MH1, MH2, MH3, MH4
KEYSTONE_8831
STANDOFF, SNAP ON
SULLINS NRPN022PAEN-RC
dc2003af
8
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
E11
E8
INTVCC
SYNC
GND
3.6V
E3
E2
E12
VIN2
2.7V - 17V
GND
VIN1
2.7V - 17V
E1
5
INTVCC
CIN2
22uF
35V
7343
CIN1
22uF
35V
7343
C6
10uF
25V
1206
R6
0
0805
500mA
0
4
4
6
3
5
JP5
2
1
JP4
2
PHASE
ILIM
6
JP3
3
5
PULSE-SKIP
4
2
1
3
180
1
SYNC
MODE/SYNC
3
OFF
1
2
JP2
RUN2
JP1
3
2
1
RUN1
ON
OFF
ON
BURST
INTVCC
500mA CHAN 2 ONLY
1A
INTVCC
INTVCC
+
+
C5
10uF
25V
1206
4
C7
1uF
4
11
6
4
3
9
7
13
1
INTVCC
ILIM
PHASE
FB2
SW2
PGOOD2
FB1
SW1
PGOOD1
MODE/SYNC
RUN2
VIN2
RUN1
VIN1
LTC3622EDE
U1
GND
15
5
JP7
1.8V
JP6
1.2V
JP11
1.5V
R11
412k
1%
JP12
1.8V
R12
309k
1%
RPG2
100k
1%
INTVCC
R2
309k
1%
R1
619k
1%
RSET1
619k
1%
JP13
3.3V
R13
137k
1%
RSET2
619k
1%
JP8
2.5V
R3
196k
1%
CUSTOMER NOTICE
VOUT2
SELECT
L2 4.7uH
VOUT1
SELECT
L1 3.3uH
RPG1
100k
1%
INTVCC
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
2
C1
47uF
1206
C2
47uF
1206
E10
E7
E6
E9
E5
1
DATE
01/23/14
06/26/12
HAORAN W.
TOM G.
APPROVED
DATE:
N/A
SIZE
1
SHEET 1
LTC3622EDE
DEMO CIRCUIT 2003A
Tuesday, June 10, 2014
PCB NO.
IC NO.
2
OF 1
REV.
DUAL WIDE VIN SYNCHRONOUS BUCK REGULATOR
WITH ULTRA-LOW QUIESCENT CURRENT
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
GND
1A
VOUT2
PGOOD2
GND
1A
VOUT1
TECHNOLOGY
C4
OPT
C3
OPT
PROD
2
E4
PROTO
PGOOD1
REVISION HISTORY
DESCRIPTION
1
REV
TITLE: SCHEMATIC
JP15
USER SELECT
R15
OPT
CFF2
22pF
R8
0
JP10
USER SELECT
R5
OPT
APPROVALS
JP14
5V
R14
84.5K
1%
JP9
3.3V
R4
137k
1%
CFF1
22pF
R7
0
2
ECO
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. ` \
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. HAORAN W.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
10
8
5
12
14
2
3
A
B
C
D
DEMO MANUAL DC2003A
Schematic Diagram
dc2003af
9
DEMO MANUAL DC2003A
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
dc2003af
10 Linear Technology Corporation
LT 0714 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
Similar pages