Linear Technology DC2017A Quick setup guide

1
dc2017af
DEMO MANUAL DC2017A
Description
LTM8055
36VIN, 8.5A Buck-Boost
μModule
®
Regulator
Demonstration circuit 2017A features the LTM
®
8055, a
buck-boost μModule
®
regulator that accepts input volt-
ages lower, higher or the same as the output, but is also
highly efficient due to its four-switch architecture. The
output for DC2017A is 12V and the input voltage range
is 5V to 36V. The maximum output current is 6A and the
switching frequency is 600kHz.
DC2017Asupportstheadjustableandcontrollablefeatures
of the LTM8055 including output voltage and current
regulation,switching frequency,RUNthreshold, soft-start
period, synchronization and reverse inductor current in-
hibit. In most cases, adjustment is made by modifying the
appropriateresistor orcapacitorcomponent(s).DC2017A
provides output current monitoring and a clock output.
L, LT, LTC, LTM, Linear Technology, µModule and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
performance summary
Input current monitoring and regulation requires the in-
stallation of a current sense resistor. The SVIN input for
controller power can be made a diode-OR of power VIN
and the output voltage to extend the operating range of
power VIN to lower voltages. There are places to mount
optional components that add an LC input filter and also a
unity gain buffer to operate multiple DC2017As in parallel.
The LTM8055 data sheet must be read in conjunction with
this demo manual to properly use or modify DC2017A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2017A
Specifications are at TA= 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage, VIN 5 V
Maximum Input Voltage, VIN 36 V
Maximum Output Current, IOUT 12V < VIN < 36V, CTL = OPEN
VIN = 6V, CTL = OPEN 6 3A A
Input Turn-On Voltage, VIN R10 = 332k, R11 = 121k, VIN Rising 5.5 V
Input Turn-Off Voltage, VIN R10 = 332k, R11 = 121k, VIN Falling 4.5 V
Output Voltage, VOUT 100mA < IOUT < 6A, R2 = 11k, 1%
R3 = 100k 1%, R4 = 0.008Ω 11.72 12.45 V
Efficiency VIN = 24V, IOUT = 6A 94 %
Switching Frequency R1 = 36.5k 600 kHz
Output Current Limit R4 = 0.008Ω 6.4 A

2
dc2017af
DEMO MANUAL DC2017A
Quick start proceDure
To use DC2017A to evaluate the performance of the
LTM8055, refer to Figure 1 for the proper measurement
equipmentsetup,Figure2forthemaximumoutputcurrent
versus input voltage and then follow the procedure below:
NOTE: Do not hot-plug the VIN terminal at high input
voltages. The absolute maximum voltage on VIN is 40V
and hot-plugging a power supply through wire leads to
the demonstration circuit can cause the voltage on the
extremely low ESR ceramic input capacitor to ring to
twice its DC value. In order to protect the LTM8055, an
aluminum electrolytic capacitor with higher ESR is placed
at the input terminals. This may protect against some, but
notall,inputtransientsduetoahot-pluggedpowersupply.
See Application Note 88 for more details.
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
ripplebytouchingtheprobetipdirectlytoterminalsacross
the VIN or VOUT capacitors. See Figure 3 for proper scope
probe technique. Solder terminals near the input or output
capacitors, if necessary.
1. ConnecttheRUN terminal to groundwitha clip-on lead.
Connect the power supply (with power off), load, and
meters as shown in Figure 1.
2. After all connections are made, turn on the input power
and verify that the input voltage is between 6V and 36V
3. Remove the clip-on lead from RUN. Verify that VOUT is
12V.
NOTE: If VOUT is too low, temporarily disconnect the load
to make sure that the load is not set too high.
Once the proper output voltage is established, adjust the
input voltage and load within the operating range and
observe the output voltage regulation, ripple voltage, ef-
ficiency and other parameters.
BoarD photo

3
dc2017af
DEMO MANUAL DC2017A
Figure 1. Proper Measurement Equipment Setup
Quick start proceDure
OPTIONAL WITH
R7 = OPEN
+
–
+
–
–
+
+–
–+
–+
0V TO 36VDC
10A
3.3V
0V
12VDC
0A TO 6A
2V
0V
OPTIONAL

4
dc2017af
DEMO MANUAL DC2017A
Figure 2. Maximum Output Current vs Input Voltage for VOUT = 12V
Figure 3. Proper Scope Probe Technique
Quick start proceDure
VIN (V)
OUTPUT CURRENT (A)
10
8
6
4
2
0
dc2017a F02
30 400 10 20
12VOUT R4 = SHORT
R4 = 0.008Ω
VOUT GND
C17

5
dc2017af
DEMO MANUAL DC2017A
Figure 4. VOUT Noise Spectrum (VIN = 24V, VOUT = 12V at 6A)
Quick start proceDure
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INTENSITY (dBm)
FREQUENCY (MHz)

6
dc2017af
DEMO MANUAL DC2017A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C2 CAP., CER., 4.7µF, X7R, 50V, 10%, 1210 MURATA, GRM32ER71H475KA88L
2 1 C3 CAP., CER., 0.22µF, X7R, 16V, 10%, 0603 TDK, C1608X7R1C224K
3 1 C4 CAP., CER., 0.01µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C103KA01D
4 2 C5, C7 CAP., CER., 22µF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE
5 1 C6 CAP., TANT., 68µF, 25V, 20%, 7343 AVX, TPSE686M025R0200
6 1 R1 RES., 36.5k, 1/10W, 1%, 0603 VISHAY, CRCW060336K5FKEA
7 1 R2 RES., 11k, 1/10W, 1%, 0603 VISHAY, CRCW060311K0FKEA
8 1 R3 RES., 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA
9 1 R4 RES., SENSE, 0.008Ω, 1/2W, 1%, 2010 VISHAY, WSL20108L000FEA
10 1 U1 I.C., 36VIN Buck-Boost µModule Regulator LINEAR TECH., LTM8055EY#PBF
Optional Demo Circuit Components
1 0 C8, C10, C18(OPT) CAP., OPTION, 0603
2 1 C9 CAP., ALUM. ELECT.,100µF, 50V, 8 ×10.2 SUN ELECT., 50CE100LX
3 0 C11(OPT) CAP., OPTION, 1206
4 0 C12, C13, C15, C16(OPT) CAP., OPTION, 1210
5 0 C14(OPT) CAP., OPTION, 7343
6 1 C17 CAP., CER., 0.1µF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E104KA01D
7 0 D1, D2(OPT) DIODE, OPTION, SOD-123
8 0 L1, L2(OPT) IND., 10µH WÜRTH, 74477010
9 0 R5, R9, R13(OPT) RES., OPTION, 0603
10 2 R6, R7 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW0603000Z0EA
11 0 R8(OPT) RES., OPTION, 2010
12 1 R10 RES., 332k, 1/10W, 1%, 0603 VISHAY, CRCW0603332KFKEA
13 1 R11 RES., 121k, 1/10W, 1%, 0603 VISHAY, CRCW0603121KFKEA
14 1 R12 RES., 20Ω, 1/10W, 5%, 0603 VISHAY, CRCW060320R0JNEA
15 0 U2(OPT) I.C., LT1636CMS8#PBF, 8-MSOP LINEAR TECH., LT1636CMS8#PBF
Hardware: For Demo Board Only
1 13 E1-E13 TESTPOINT, TURRET, .094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
2 4 J1, J2, J3, J4 JACK BANANA KEYSTONE, 575-4
3 4 MH1-MH4 STANDOFF, NYLON, SNAP-ON, 0.500" KEYSTONE, 8833

7
dc2017af
DEMO MANUAL DC2017A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram
1. ALL RESISTORS ARE 0603, 1%. ALL CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
600kHz
*
*SEE FIGURE 2
FOR IOUT MAX. VS. VIN
VIN
VIN
VIN
VIN
VOUT
IOUTMON
VOUT
VIN
IOUTMON
R3
100K
R3
100K
R1
36.5k
R1
36.5k
C10
OPT
C10
OPT
R6
0
R6
0
E12 VOUT
12V
E12 VOUT
12V
TP5
SYNC
TP5
SYNC
L1
10uH
74477010
OPT
L1
10uH
74477010
OPT
D2
OPT
SOD-123
D2
OPT
SOD-123
R9
OPT
R9
OPT
E9
IINMON
E9
IINMON
C12
4.7uF
50V
1210
OPT
C12
4.7uF
50V
1210
OPT
C1
4.7uF
50V 1210 C1
4.7uF
50V 1210
R8
OPT
2010
R8
OPT
2010
+
C14
OPT
7343
+
C14
OPT
7343
TP3
IOUTMON BFR
TP3
IOUTMON BFR
E1
SVIN
5V - 36V E1
SVIN
5V - 36V
E7
LL
E7
LL
E4
GND
E4
GND
R10
332k
R10
332k
TP1TP1
R13
OPT
R13
OPT
J2
GND
J2
GND
R4
0.008
2010
R4
0.008
2010
C2
4.7uF
50V 1210 C2
4.7uF
50V 1210
TP7
CTL
TP7
CTL
C15
OPT
50V 1210
C15
OPT
50V 1210 C8
OPT 1nF
C8
OPT 1nF
R11
121k
R11
121k
C3
0.22uF
C3
0.22uF
L2
10uH
74477010
OPT
L2
10uH
74477010
OPT
TP2
GND
TP2
GND
+
C9
100uF
50V
8mm DIA.
+
C9
100uF
50V
8mm DIA.
TP4
CLKOUT
TP4
CLKOUT
E8
IOUTMON
E8
IOUTMON
J3J3
U1
LTM8055EY
U1
LTM8055EY
VOUT
A1
VOUT
A2
VOUT
A3
VOUT
A4
VOUT
A5
VOUT
B1
VOUT
B2
VOUT
B3
VOUT
B4
VOUT
B5
VIN
G10
VIN
G11
VIN
H10
VIN
H11
VIN
J10
VIN
J11
VIN
K10
VIN
K11
VIN
L11
VIN
L10
IIN
L9
CLKOUT
G1
IOUT
D1
RT
H1
SYNC
H2
FB
J1
COMP
J2
CTL
K2
SS
K1
GND
L1
IOUTMON
L2
IINMON
L3
RUN
L4
GND
A9
GND
A7
GND
A8
GND
B7
GND
B8
GND
C7
GND
C8
GND
D2
GND
D3
GND
D4
GND
D5
GND
D6
GND
D7
GND
D8
GND
E1
GND
E2
GND
E3
GND
E4
GND
E5
GND
E6
GND
E7
GND
E8
LL
F1
GND
F2
GND
F3
GND
F4
GND
F5
GND
F6
GND
F7
GND
F8
GND
G3
GND
G4
GND
G5
GND
G6
GND
H3
GND
H4
GND
H5
GND
H6
GND
J3
GND
J4
GND
J5
GND
J6
GND
K3
GND
K4
GND
K5
GND
K6
GND
L5
SVIN
F11
SVIN
F10
VOUT
A6
VOUT
B6
VOUT
C1
VOUT
C2
VOUT
C3
VOUT
C4
VOUT
C5
VOUT
C6
GND
A10
GND
A11
GND
B9
GND
B10
GND
B11
GND
C9
GND
C10
GND
C11
GND
D9
GND
D10
GND
D11
GND
E9
GND
E10
GND
E11
GND
F9
GND
G7
GND
G8
GND
G9
GND
H7
GND
H8
GND
H9
GND
J7
GND
J8
GND
J9
GND
K7
GND
K8
GND
K9
GND
L6
GND
L7
GND
L8
MODE
G2
J1
5V - 36V
VIN
J1
5V - 36V
VIN
D1
OPT
SOD-123
D1
OPT
SOD-123
C7
22uF
25V
0805
C7
22uF
25V
0805
+
C6
68uF
25V
7343
+
C6
68uF
25V
7343
C18
OPT 0.1uF
C18
OPT 0.1uF
R7
0
R7
0
C16
OPT 1210
C16
OPT 1210
C5
22uF
25V
0805
C5
22uF
25V
0805
E5
CTL
E5
CTL
E10
RUN
E10
RUN
E2
CLKOUT
E2
CLKOUT
E6
MODE E6 MODE
E11
GND
E11
GND
R2
11k
R2
11k
R5
OPT
51
5%
R5
OPT
51
5%
C13
4.7uF
50V
1210 OPT
C13
4.7uF
50V
1210 OPT
C11
OPT
1206
1uF
C11
OPT
1206
1uF
R12
20 5%
R12
20 5%
TP6
GND
TP6
GND E13
GND
E13
GND
C4
0.01uF
C4
0.01uF
C17
0.1uF 25V
C17
0.1uF 25V
- +
V+
V-
SHDN
U2 LT1636CMS8
OPT
- +
V+
V-
SHDN
U2 LT1636CMS8
OPT
3
2
6
74
5
E3
SYNC
E3
SYNC J4J4

8
dc2017af
DEMO MANUAL DC2017A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
LT 1214 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstration board (DEMO BOARD)kit being soldorprovided by LinearTechnology isintended for useforENGINEERING 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. LT C 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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation