1
DEMO MANUAL DC1543A
Rev. B
DESCRIPTION
LTM4641
38V, 10A, Step-Down µModule Regulator
with Advanced Input and Load Protection
Demonstration circuit 1543A features the LTM
®
4641, a
high efficiency, high density switch mode step-down power
µModule regulator with superior input and load protection
features. The input voltage range is from 4.5V to 38V. The
output voltage is jumper programmable from 0.8V to 6V
with a rated load current of 10A. Derating is necessary
for certain VIN, VOUT, frequency and thermal conditions.
DC1543A offers the TRACK/SS pin allowing the user to
program output tracking or soft-start period. The DC1543A
allows the user to enable/disable input undervoltage
PERFORMANCE SUMMARY
BOARD PHOTO
protection; input latching/non-latching overvoltage protec-
tion; and latching/non-latching overtemperature protection.
Higher efficiency at low load currents is achieved by setting
the MODE pin jumper to DCM. The LTM4641 data sheet
must be read in conjunction with this demo manual prior
to working on or modifying demo circuit 1543A.
Design files for this circuit board are available.
PARAMETER CONDITIONS VALUE
Input Voltage Range 4.5V to 38V
Output Voltage VOUT Jumper Selectable 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 3.3V, 5V, 6V; ±1.5%
Maximum Continuous Output Current Derating is Necessary for Certain Operating Conditions.
See Data Sheet for Details.
10ADC
Default Operating Frequency RfSET = 680kΩ for VOUT = 0.8V, 1.0V, 1.2V, 1.5V, 1.8V;
RfSET = ∞ (Not Stuffed) for VOUT = 3.3V, 5.0V, 6.0V
255kHz (VOUT = 0.8V); 320kHz (VOUT = 1.0V);
385kHz (VOUT = 1.2V); 480kHz (VOUT = 1.5V);
575kHz (VOUT = 1.8V); 360kHz (VOUT = 3.3V);
550kHz (VOUT = 5.0V); 660kHz (VOUT = 6.0V);
Efficiency VIN = 12V, VOUT = 6V, IOUT = 10A 93.0% See Figure2
Load Transient VIN = 12V, VOUT = 3.3V See Figure3
All registered trademarks and trademarks are the property of their respective owners.
2
DEMO MANUAL DC1543A
Rev. B
QUICK START PROCEDURE
Demonstration circuit 1543A is an easy way to evaluate
the performance of the LTM4641. Please refer to Figure1
for proper measurement equipment setup and follow the
procedure below:
1. Place jumpers in the following positions for a typical
3.3VOUT application:
INPUT
OVLO
NON-LATCH INPUT
OVP
INPUT UVLO OVER-TEMP
BEHAVIOR
OFF OFF OFF NON-LATCH
RUN MODE TRACK/SS VOUT Select FSET
ON CCM SS 3.3V VOUT > 3.0V
2. With power off, connect the input power supply, load
and meters as shown in Figure1. Preset the load to 0A
and VIN supply to be 0V.
3. Turn on the power at the input. Increase VIN to 12V
(Do not apply more than the rated maximum voltage
of 38V to the board or the part may be damaged).
The output voltage should be regulated and deliver the
selected output voltage ±1.5%.
4. Vary the input voltage from 4.5V to 38V and adjust
the load current from 0A to 10A. Observe the output
voltage regulation, ripple voltage, efficiency, and other
parameters. Output voltage ripple may be measured at
J6 with a BNC cable and oscilloscope. The probe channel
for VOUT should be set at 50Ω termination resistance
to match the BNC cable.
5. (Optional) For optional load transient test, apply an
adjustable pulse signal between IOSTEP_CLK and GND
test points. The pulse amplitude sets the load step cur-
rent amplitude. Keep the pulse width short (<1ms) and
pulse duty cycle low (<5%) to limit the thermal stress
on the load transient circuit. The load step current can
be monitored with a BNC connected to J5 (25mV/A).
6. (Optional) To test the advanced input and load pro-
tections, put the corresponding jumper in the “ON”
position. For DC1543A, the thresholds for different
input and output protections are set as shown below:
INPUT OVLO 36V
NON-LATCH INPUT OVP 32V
INPUT UVLO 8V for Rising Edge
7V for Falling Edge
OVER-TEMP
BEHAVIOR
LATCH 145°C
NON-LATCH 145°C: Cease Regulation
135°C: Resume Regulation
4
DEMO MANUAL DC1543A
Rev. B
OUTPUT CURRENT (A)
0
40
60
EFFICIENCY (%)
90
85
80
75
70
65
50
55
45
95
1 6 7 8 9
10
2345
1.8VOUT, 325kHz
2.5VOUT, 335kHz
3.3VOUT, 360kHz
0.9VOUT, 235kHz
1.0VOUT, 255kHz
1.2VOUT, 285kHz
1.5VOUT, 315kHz
40
60
90
85
80
75
70
65
50
55
45
95
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
1 6 7 8 9
10
2345
1.8VOUT, 325kHz
2.5VOUT, 335kHz
3.3VOUT, 360kHz
5.0VOUT, 550kHz
6.0VOUT, 660kHz
0.9VOUT, 235kHz
1.0VOUT, 255kHz
1.2VOUT, 285kHz
1.5VOUT, 315kHz
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
1 6 7 8 9
10
2345
40
60
90
85
80
75
70
65
50
55
45
95
1.8VOUT, 325kHz
2.5VOUT, 335kHz
3.3VOUT, 360kHz
5.0VOUT, 550kHz
6.0VOUT, 660kHz
0.9VOUT, 235kHz
1.0VOUT, 255kHz
1.2VOUT, 285kHz
1.5VOUT, 315kHz
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
1 6 7 8 9
10
2345
1.8VOUT, 325kHz
2.5VOUT, 335kHz
3.3VOUT, 360kHz
5.0VOUT, 550kHz
6.0VOUT, 660kHz
0.9VOUT, 235kHz
1.0VOUT, 255kHz
1.2VOUT, 285kHz
1.5VOUT, 315kHz
40
60
90
85
80
75
70
65
50
55
45
95
Efficiency vs Load Current at 6VIN
Efficiency vs Load Current at 12VIN
2a. VIN = 6V
2b. VIN = 12V
2c. VIN = 24V
2d. VIN = 36V
Efficiency vs Load Current at 24VIN
Efficiency vs Load Current at 36VIN
Figure2. Measured DC1543A Efficiency at Different VIN, VOUT and fSW (CCM Mode Enabled)
Please refer to Table 1 in LTM4641 data sheet for the switching frequency at each output voltage.
QUICK START PROCEDURE
5
DEMO MANUAL DC1543A
Rev. B
QUICK START PROCEDURE
3a. VIN = 12V, VO = 3.3V, 0A to 4A Load Step
VIN = 24V, VOUT =6V, ILOAD = 10A, Ambient Temperature = 29.4°C, No Forced Air Flow
Figure4. Thermal Image of LTM4641
Figure3. Measured Load Transient Responses
VOUT: 50mV/DIV
IOUT_STEP: 4A/DIV
3b. VIN = 12V, VO = 1.0V, 0A to 4A Load Step
VOUT: 20mV/DIV
IOUT_STEP: 4A/DIV
6
DEMO MANUAL DC1543A
Rev. B
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 CIN2, CIN1 CAP., ALUMINUM, 100µF, 50V SUN ELECT, 50CE100LX
2 2 CIN3, CIN4 CAP., X7R, 4.7µF, 50V, 10%, 1210 AVX, 12105C475KAT2A
3 3 CO1, CO2, CO8 CAP., POSCAP, 150µF, 10V, D3L PANASONIC, 10TPF150ML
4 3 CO3, CO4, CO5 CAP., X7R, 47µF, 10V, 10%, 1210 AVX, 1210ZC476KAT2A
5 1 C10 CAP., X5R, 3300pF, 50V, 10%, 0603 AVX, 06035C332KAT2A
6 1 R1 RES., CHIP, 13.7k, 1/16W, 1%, 0603 VISHAY, CRCW060313K7FKEA
7 2 R5, R7 RES., CHIP, 100k, 1/16W, 1%, 0603 VISHAY, CRCW0603100KFKEA
8 2 R13, R26 RES., CHIP, 2.49k, 1/16W, ±0.1%, 0603 VISHAY, TNPW06032K49BEEA
9 1 U1 I.C., LTM4641, BGA ANALOG DEVICES, LTM4641EY#PBF
Hardware/Components (For Demo Board Only)
1 1 C2 CAP., X7R, 4.7µF, 25V, 10%, 0805 TDK, C2012X7RIE475K125AB
2 2 C8, C9 CAP., X5R, 8200pF, 50V, 10%, 0603 AVX, 06035C822KAT2A
3 1 R2 RES., CHIP, 680k, 1/16W, 1%, 0603 YAGEO, RC0603FR-07680KL
4 1 R15 RES., CHIP, 2.2M, 1/16W, 1%, 0603 VISHAY, CRCW06032M20FKEA
5 1 R17 RES., CHIP, 165k, 1/16W, 1%, 0603 VISHAY, CRCW0603165KFKEA
6 1 R18 RES., CHIP, 7.15k, 1/16W, 1%, 0603 VISHAY, CRCW06037K15FKEA
7 1 R19 RES., CHIP, 4.12k, 1/16W, 1%, 0603 VISHAY, CRCW06034K22FKEA
8 1 R20 RES., CHIP, 2.94k, 1/16W, 1%, 0603 VISHAY, CRCW06032K94FKEA
9 1 R21 RES., CHIP, 1.18k, 1/16W, 1%, 0603 VISHAY, CRCW06031K18FKEA
10 1 R22 RES., CHIP, 715Ω, 1/16W, 1%, 0603 VISHAY, CRCW0603715RFKEA
11 1 R23 RES., CHIP, 576Ω, 1/16W, 1%, 0603 VISHAY, CRCW0603576RFKEA
12 1 R25 RES., CHIP, 3.16k, 1/16W, 1%, 0603 VISHAY, CRCW06033K16FKEA
13 1 R28 RES., CHIP, 24.9k, 1/16W, 1%, 0603 VISHAY, CRCW060324K9FKEA
14 1 R10 RES., CHIP, 1.78M, 1/16W, 1%, 0603 VISHAY, CRCW06031M78FKEA
15 1 R24 RES., CHIP, 13k, 1/16W, 1%, 0603 VISHAY, CRCW06065K5KFKEA
16 1 R16 RES., CHIP, 1M, 1/16W, 1%, 0603 VISHAY, CRCW06031M00FKEA
17 1 R9 RES., CHIP, 187k, 1/16W, 1%, 0603 VISHAY, CRCW0603187KFKEA
18 2 R12, R8 RES., CHIP, 10Ω, 1/16W, 1%, 0603 VISHAY, CRCW060310R0FKEA
19 3 R6, R31, R34 RES., CHIP, 0Ω, 1/16W, 1%, 0603 VISHAY, CRCW06030000Z0EA
20 2 R3, R32 RES., CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW060310K0FKEA
21 2 RS2, RS1 RES., CHIP, 0.05Ω, 1W, 1% 2512 VISHAY, WSL2512R0500FEA
22 1 Q2 SILICON N-CHANNEL MOSFET, POWERPAK-SO8 VISHAY, SiR184DP-T1-RE3
23 1 Q3 SILICON N-CHANNEL POWER MOSFET, LFPAK NEXPERIA PSMN2R5-30YL
24 1 Q1 N-CHANNEL 40-V MOSFET, TO-252 VISHAY, SUD50N04-8M8P-4GE3
25 0 C3, C4, C5, C6, C7(OPT) CAP., 0603
26 0 CIN5(OPT) CAP., 1210
27 0 R4, R27, R29, R33, R35, R36(OPT) RES., 0603
28 0 R11(OPT) RES., 1206
29 0 D2 (OPT) ZENER VOLTAGE REGULATOR, SOD-523 CENTRAL SEMI., CMOZ43V TR
Hardware
1 9 JP1-JP8, JP18 2mm SINGLE ROW HEADER, 2-PIN SAMTEC, TMM102-02-L-S
2 8 JP9-JP15, JP18 2mm SINGLE ROW HEADER, 3-PIN SAMTEC, TMM-103-02-L-S
3 3 JP4, JP9-JP15, JP17 SHUNT SAMTEC, 2SN-BK-G
4 2 J5, J6 CONN, BNC, 5 PINS CONNEX, 112404
5 4 J1-J4 JACK, BANANA KEYSTONE, 575-4
6 13 E2, E5-E8, E11, E12, E15-E20 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0
7 1 JP16 ULTRA-SMALL TRACTILE SWITCH PANASONIC, EVQPE105K
8 4 STAND OFF STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833 (SNAP ON)
7
DEMO MANUAL DC1543A
Rev. B
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Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
8
DEMO MANUAL DC1543A
Rev. B
ANALOG DEVICES, INC. 2011-2019
4/19
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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