DC1700A - Demo Manual

DEMO MANUAL DC1700A
LTC3613EWKH
Fast, High Efficiency
Step-Down Regulator
DESCRIPTION
Demonstration circuit 1700A is a fast, high efficiency
synchronous buck DC/DC converter with 4.5V to 24V
input range. It can supply 15A maximum load current at
1.5V output. The demo board features the LTC®3613EWKH
regulator. No external MOSFETs are required. The controlled on-time constant frequency valley current mode
architecture allows for both fast transient response and
constant frequency switching in steady-state operation.
Differential output voltage sensing along with a precision
internal reference combine to offer an accurate output
regulation. The LTC3613 is ideal for applications such
as distributed power systems, servers and point-of-load
converters. The LTC3613EWKH is in a 7mm × 9mm 54-pin
QFN package.
The light load operation mode of the converter is determined with the MODE/PLLIN pin. Use JP2 jumper to
select discontinuous mode (DCM) or forced continuous
mode (CCM) operation. Switching frequency is pre-set
at about 350kHz. This frequency can be modified from
200kHz to 1MHz by changing the value of a resistor (R18).
The converter can also be externally synchronized from
200kHz to 1MHz through the MODE/PLLIN pin (PLLIN
terminal on the board). To shut down the converter, one
simple way is to force the RUN pin below 1.1V (JP1: OFF).
The power good output (PGOOD terminal) is low when the
output voltage is outside of the ±7.5% regulation window.
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 of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
PARAMETER
(TA = 25°C)
CONDITIONS
Input Voltage Range
VALUE
4.5V to 24V
Output Voltage, VOUT
VIN = 4.5V to 24V, IOUT = 0A to 15A
1.5V ±2%
Maximum Output Current, IOUT
VIN = 4.5V to 24V, VOUT = 1.5V
15A
Typical Output Ripple
VIN = 12V, IOUT = 15A (20MHz BW)
40mVP–P
Typical Efficiency
VIN = 12V, VOUT = 1.5V, IOUT = 15A
87.5%
Typical Switching Frequency
350kHz
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DEMO MANUAL DC1700A
QUICK START PROCEDURE
Demonstration circuit 1700A is easy to set up to evaluate
the performance of the LTC3613. Refer to Figure 1 for
the proper measurement equipment setup and follow the
procedure below:
5. Once the proper output voltages are established, adjust the loads within the operating range and observe
the output voltage regulation, ripple voltage and other
parameters.
1. With power off, connect the input power supply to VIN
(4.5V to 24V) and GND (input return).
Note: When measuring the output or input voltage ripple,
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.
2. Connect the 1.5V output load between VOUT and GND
(Initial load: no load).
3. Connect the DVMs to the input and outputs.
4. Turn on the input power supply and check for the proper
output voltages. VOUT should be 1.5V ±2%.
Figure 1. Proper Measurement Equipment Setup
+
VOUT
–
COUT
GND
Figure 2. Measuring Output Voltage Ripple
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DEMO MANUAL DC1700A
QUICK START PROCEDURE
91
90
89
EFFICIENCY (%)
88
87
86
85
84
83
82
0
5
10
15
LOAD CURRENT (A)
Figure 3. Efficiency vs Load Current (VIN = 12V, VO = 1.5V, CCM)
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DEMO MANUAL DC1700A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
2
CIN1, CIN2
CAP, 1210 10μF 10% 16V X5R
AVX, 1210YD106KAT
2
1
CIN4
CAP, 82μF, 25V, Sanyo
SANYO, 25SVPD82M
3
2
COUT1, COUT2
CAP, 1206 100μF 20% 6.3V X5R
MURATA, GRM31CR60J107ME39L
4
2
COUT3, COUT4
CAP, 7343 330μF 20% 2.5V POSCAP
SANYO 2R5TPE330M9
5
2
C1, C8
CAP, 0603 0.1μF 10% 25V X7R
TDK C1608X7R1E104K
6
1
C2
CAP, 0603 1000pF 10% 50V X7R
AVX, 06035C102KAT
7
2
C3, C5
CAP, 0805 4.7μF 10% 16V X5R
TDK C2012X5R1C475K
8
1
C6
CAP, 0603 47pF 10% 25V NPO
AVX, 06033A470KAT2A
9
1
C7
CAP, 0603 0.01μF 10% 50V X7R
AVX, 06035C103KAT
10
1
C9
CAP, 0603 270pF 10% 25V NPO
AVX, 06033A271KAT2A
11
1
C10
CAP, 0603 1μF 10% 25V X5R
AVX, 06033D105KAT
12
1
D1
DIODE,CMDSH-3 SOD323
CENTRAL CMDSH-3
13
1
L1
IND., 0.47μH, FP1109 series
COILTRONICS, FP1109-R47-R
14
1
Q5
XSTR, MOSFET, DPAK-TO252AA
VISHAY SUD50N03-12P-E3
15
1
RS1
RES, 2010 0.0015Ω 1% 1/2W
VISHAY WSL20101L500FEA
16
1
R1
RES, 0603 100k 1% 1/10W
VISHAY CRCW0603100KFKEA
17
3
R2, R12, R17
RES, 0603 0Ω JUMPER
VISHAY CRCW06030000Z0EA
18
2
R4, R5
RES, 0603 10Ω 1% 1/10W
VISHAY CRCW060310R0FKEA
19
2
R6, R8
RES, 0603 100Ω 1% 1/10W
PANASONIC, ERJ-3EKF1000V
20
1
R10
RES, 0603 90.9k 1% 1/10W
PANASONIC, ERJ-3EKF9092V
21
1
R11
RES, 0603 60.4k 1% 1/10W
VISHAY, CRCW060360K4FKEA
22
1
R13
RES, 0603 2.2Ω 1% 1/10W
NIC, NRC06F2R20TRF
23
1
R15
RES, 0603 21k 1% 1/10W
VISHAY, CRCW060321K0FKEA
24
1
R18
RES, 0603 115k 1% 1/10W
VISHAY, CRCW0603115KFKEA
25
2
R20, R23
RES, 0603 10k 1% 1/10W
NIC, NRC06F1002TRF
25
1
R22
RES, 2010 0.01Ω 1% 1/2W
VISHAY WSL2010R0100FEA
27
1
U1
LTC3613EWKH
QFN-56-7X9
Additional Demo Board Circuit Components
28
1
CIN3
OPT, 1210
29
2
COUT5, COUT6
OPT
30
3
C4, R9, R16
OPT
31
1
R3
OPT
32
4
R7, R14, R19, R21
OPT
E1, E2, E3, E4, E5, E6, E7, E8,
TURRET
Demo Board Only
33
12
34
MILL-MAX 2501-2-00-80-00-00-07-0
E9, E10, E11, E12
35
2
JP1, JP2
HEADER, 3PIN, 2mm
SAMTEC TMM-103-02-L-S
36
2
XJP1, XJP2
SHUNT, 2mm
SAMTEC 2SN-BK-G
37
2
J1, J2
JACK, BANANA
KEYSTONE 575-4
38
2
J3, J4
CONN, BNC, 5 PINS
CONNEX 112404
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4
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
JP2
EXTVCC
PLLIN
E9
E10
VIN
R14
OPT
5
EXTVCC
R23
10k
44
43
42
41
40
39
38
37
36
51
50
49
48
47
46
45
52
59
R21
OPT
R19
OPT
INTVCC
R12
0
1
2
3
E12
E11
MODE
1
2
3
DCM
CCM
OFF
ON
TRACK
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
SW
SW
SW
SW
SW
SW
SW
NC
SW
U1B
LTC3613EWKH
JP1
RUN
SGND
SGND
SGND
SGND
SGND
SGND
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PGOOD
16
17
19
28
29
57
2
3
4
5
6
7
8
9
58
56
55
54
53
C4
OPT
R16
OPT
270pF
C9
13
21K
47pF
RT
VRNG
ITH
TRACK/SS
VOSNS+
VOSNS-
VOUT
SNS-
SNS+
2. ALL RESISTORS ARE IN 0603
ALL CAPACITORS ARE IN 0603
4
1. WHEN DCR SENSING IS IMPLEMENTED, SHORT RS1
AND R9; DO NOT POPULATE R6 AND R8.
11
31
32
1
33
EXTVCC
3
S-
R9
OPT
R7
OPT
CUSTOMER NOTICE
FP1109-R47
0.47uH
L1
OPT
R3
S+
CIN1
10uF
25V
1210
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
SCALE = NONE
Q5
DATE:
N/A
SIZE
330uF
2.5V
7343
CIN3
1210
OPT
+COUT3
82uF
25V
SANYO
25SVPD82M
+CIN4
VIN
330uF
2.5V
7343
+COUT4
VOUT
PRODUCTION
R20
10K
1
LOAD STEP
CIRCUIT
5% DUTY CYCLE MAX
GND
PULSE
GEN
VOUT
VIN-
GND
4.5V - 24V
LTC3613EWKH
1
DEMO CIRCUIT 1700A
Tuesday, August 23, 2011
IC NO.
SHEET 1
OF 1
3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
J4
E8
E7
J3
VIN+
GND
1.5V / 15A
VOUT
VO_SNS-
VO_SNS+
VIN
DATE
CHARLIE Z. 08-23-11
APPROVED
FAST, HIGH EFFICIENCY STEP-DOWN REGULATOR
TECHNOLOGY
1
C3
4.7uF
16V
0805
E6
E5
E4
E3
J2
J1
E2
E1
DESCRIPTION
REVISION HISTORY
LOAD STEP CIRCUIT
R5
10
3
REV
TITLE: SCHEMATIC
R22
0.01
2010
SUD50N03-12P
APP ENG. CHARLIE Z.
AK
VOUT
R4
10
__
ECO
COUT5
OPT
1206
COUT2
100uF
6.3V
1206
COUT6
OPT
1206
2
APPROVALS
CIN2
10uF
25V
1210
COUT1
100uF
6.3V
1206
PCB DES.
2010
RS1
0.0015
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.
R13
2.2
INTVCC
SW
D1
CMDSH-3 INTVCC
1
2
C8
0.1uF
50V
C5
4.7uF
16V
0805
C1
0.1uF
16V
R2
0
INTVCC
34
30
EXTVCC 27
C10
NC
26 1uF
RUN
MODE/PLLIN
SVIN
PVIN
INTVCC
INTVCC
10
SW 35
SW
36
PGND
BOOST
U1A
LTC3613EWKH
PGOOD
FSW = 350kHz
R18
115K
25
24
23
22
21
20
18
14
1000pF
C2 15
R11
60.4K
S-
S+
R17
0
R15
C6
R10
90.9K
R8 100
R6 100
R1
100K
INTVCC
NOTES: UNLESS OTHERWISE SPECIFIED
INTVCC
C7
0.01uF
SW
4
SGND
12
5
2
3
D
VIN
A
B
C
D
DEMO MANUAL DC1700A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1700A
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
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6
Linear Technology Corporation
LT 1011 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
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