DC1161B - Demo Manual

DEMO MANUAL DC1161B
LT3507
Triple Monolithic Step-Down
Regulator with LDO
DESCRIPTION
Demo circuit 1161B is a triple monolithic step-down
regulator with LDO featuring LT®3507. The demo circuit
is designed for 1.8V, 3.3V, 5.0V and 2.5V outputs from a
7V to 36V input. The current capability of each channel
is 2.4A, 1.3A, 1.4A and 0.2A respectively. Independent
input voltage, feedback, soft-start and power good pins
for each channel simplify complex power supply tracking/
sequencing requirements.
All three converters are either synchronized to a common
external clock input or single-resistor programmable from
250kHz to 2.5MHz using internal oscillator. At all frequencies, a 180° phase shift between VOUT1 and the other two
outputs is maintained, reducing input voltage ripple and
component size. Programmable frequency allows for optimization between efficiency and external component size.
PERFORMANCE SUMMARY
PARAMETER
Each output can be independently disabled using its own
soft-start pin, or by using the SHDN pin the entire part
can be placed in a low quiescent current shutdown mode.
The LT3507 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1161B.
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.
(TA = 25°C)
CONDITION
Minimum Input Voltage
VALUE
7V
Maximum Input Voltage
36V
Output Voltage VOUT1
VIN = 7V ~ 36V
1.80V ±3%
Output Voltage VOUT2
VIN = 7V ~ 36V
3.33V ±3%
Output Voltage VOUT3
VIN = 7V ~ 36V
5.0V ±3%
Output Voltage VOUT4
VIN = 7V ~ 36V
2.52V ±3%
Maximum Output Current IOUT1
VIN = 7V ~ 36V
2.4A
Maximum Output Current IOUT2
VIN = 7V ~ 36V
1.3A
Maximum Output Current IOUT3
VIN = 7V ~ 36V
1.4A
Maximum Output Current IOUT4
VIN = 7V ~ 36V
0.2A
Voltage Ripple VOUT1
VIN = 12V, IOUT1 = 2.4A
<20mV
Voltage Ripple VOUT2
VIN = 12V, IOUT2= 1.3A
<20mV
Voltage Ripple VOUT3
VIN = 12V, IOUT3= 1.4A
<20mV
Voltage Ripple VOUT4
VIN = 12V, IOUT4= 0.2A
<10mV
Switching Frequency
450kHz ±10%
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DEMO MANUAL DC1161B
QUICK START PROCEDURE
Demo circuit 1161B is easy to set up to evaluate the
performance of the LT3507. Refer to Figure 1 for proper
measurement equipment setup and follow the procedure
below:
1. With power off, connect the input power supply to VIN
and GND.
2. Turn on the power at the input.
Note: Make sure that the input voltage does not exceed 36V.
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.
–
+
A
LOAD
3. Check for the proper output voltages.
Note: If there is no output, temporarily disconnect the load
to make sure that the load is not set too high.
4. Once the proper output voltages are established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
+
+
– –
V
+
–
A
LOAD
–
–
+ +
V
–
–
–
V
+
POWER
SUPPLY
+
A
A
+
–
–
V
+
–
+
+
+
A
+
V
LOAD
–
–
+
LOAD
–
DC1161B F01
Figure 1. DC1161B Proper Equipment Setup
VIN
GND
Figure 2. Measuring Input or Output Ripple
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DEMO MANUAL DC1161B
SYNC FUNCTION
EMI FILTER
Install a 10k R20 resistor if the board is synchronized from
an external signal generator.
Install EMI filters on the backside of the DC1161, however,
a trace cut is required for the insertion of the option circuit.
See Figure 3 for the cut line.
CUT HERE
Figure 3. Cut Line for the EMI Filter Installation
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DEMO MANUAL DC1161B
PARTS LIST
ITEM
QTY
REFERENCE
Required Circuit Components
1
3
CIN1, CIN2, CIN3
2
3
C1, C2, C9
3
2
C3, C10
4
1
C4
5
3
C5, C6, C11
6
4
C7, C8, C13, C20
7
1
C12
8
3
C15, C17, C19
9
1
D4
10
2
D6, D5
11
3
D7, D8, D9
12
1
L1
13
1
L2
14
1
L3
15
1
Q1
16
5
R1, R2, R3, R15, R22
17
1
R4
18
1
R5
19
3
R6, R7, R11
20
3
R8, R9, R23
21
1
R10
22
1
R12
23
1
R13
24
1
R14
25
1
R16
26
1
R17
27
1
R18
28
1
R19
29
1
U1
Additional Demo Board Circuit Components
1
1
CIN4
2
0
C14, C16, C18
3
0
C21
4
0
C22
5
0
C23
6
4
C24-C27
7
0
C28
8
0
C29
9
0
D1, D2, D3
10
0
FB1
11
0
L4
12
0
R20
13
0
R21
Hardware-For Demo Board Only
1
10
E1, E2, E6-E9, E12-E15
2
9
E3, E4, E5, E10, E11, E16-E19
PART DESCRIPTION
MANUFACTURER / PART #
CAP., X7R, 2.2μF, 50V, 10%, 1210
CAP., X7R, 0.22μF, 25V, 10%, 0603
CAP., X5R, 47μF, 10V, 20%, 1206
CAP., X5R, 22μF, 6.3V, 20%, 1206
CAP., X7R, 680pF, 50V, 10%, 0402
CAP., X5R, 0.1μF, 10V, 10%, 0402
CAP., X5R, 2.2μF, 6.3V, 20%, 0603
CAP., NPO, 47pF, 50V, 5%, 0402
DIODE, SCHOTTKY, B340A, SMA-DIODE
DIODE, SCHOTTKY, B240A, SMA-DIODE
DIODE, SCHOTTKY, CMDSH-4E, SOD323
IND., 4.7μH
IND., 8.2μH
IND., 10μH
XTOR, NPN, 50V LOW SATURATION, MLP322
RES., CHIP, 100k, 1/16W, 1%, 0402
RES., CHIP, 12.4k, 1/16W, 1%, 0402
RES., CHIP, 31.6k, 1/16W, 1% 0402
RES., CHIP, 20k, 1/16W, 1% 0402
RES., CHIP, 10k, 1/16W, 1% 0402
RES., CHIP, 53.6k, 1/16W, 1% 0402
RES., CHIP, 10.2k, 1/16W, 1% 0402
RES., CHIP, 1.07k, 1/16W, 1% 0402
RES., CHIP, 49.9k, 1/16W, 1% 0402
RES., CHIP, 499Ω, 1/16W, 1% 0402
RES., CHIP, 18.2k, 1/16W, 1% 0402
RES., CHIP, 3.32k, 1/16W, 1% 0402
RES., CHIP, 107k, 1/16W, 1% 0402
I.C., LT3507EUHF, QFN38UHF
TDK, C3225X7R1H225K
TDK, C1608X7R1E224K
TAIYO YUDEN, LMK316BJ476ML-T
TAIYO YUDEN, JMK316BJ226ML
AVX, 04025C681KAT
AVX, 0402ZD104KAT
TAIYO YUDEN, JMK107BJ225MA
AVX, 04025A470JAT
DIODES INC., B340A
DIODES INC., B240A
CENTRAL SEMI., CMDSH-4E
NIC, NPIM74C4R7MTRF
NIC, NPIM74C8R2MTRF
NIC, NPIM74C100MTRF
ZETEX, ZXTCM322TA
YAGEO, RC0402FR-07100KL
VISHAY, CRCW040212K4FKEA
VISHAY, CRCW040231K6FKEA
VISHAY, CRCW040220K0FKEA
YAGEO, RC0402FR-0710KL
VISHAY, CRCW040253K6FKEA
NIC, NRC04F1022TRF
YAGEO, RC0402FR-071K07L
VISHAY, CRCW040249K9FKEA
AAC, CR05-4990FM
VISHAY, CRCW040218K2FKEA
VISHAY, CRCW04023K32FKEA
AAC, CR05-1073FM
LINEAR TECH., LT3507EUHF
CAP., ELECTROLYTIC, 22μF, 50V
CAP., 0402
CAP., X7R, 0.01μF, 50V, 10%, 0603
CAP., X7R, 2.2μF, 50V, 10%, 1210
CAP., ELECTROLYTIC, 22μF 50V
CAP., X5R, 1μF, 10V, 10%, 0603
CAP., 0402
CAP., 1206
DIODE, SCHOTTKY, CMDSH-4E, SOD323
BEAD, 1206 OPT
IND., 22μH, OPT
RES., CHIP, 0402
RES., CHIP, 0603
SANYO, 50CE22LX
OPT
OPT
OPT
OPT
MURATA, GRM188R61A105K
OPT
OPT
OPT
TAIYO YUDEN, FB MJ3216HS800
VISHAY, IHLP4040DZER220-M01
OPT
OPT
TP, TURRET, 0.094"
TP, TURRET, 0.064"
MILL-MAX, 2501-2-00-80-00-00-07-0
MILL-MAX, 2308-2-00-44
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DEMO MANUAL DC1161B
SCHEMATIC DIAGRAM
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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.
5
DEMO MANUAL DC1161B
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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Linear Technology Corporation
LT 0411 • 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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