Analog Devices DC2910A Quick setup guide

1
DEMO MANUAL DC2910A
Rev. 0
DESCRIPTION
LTM4691
Low VIN, High Efficiency, Dual 2A Step-down
μModule DC/DC Converter
Demonstration circuit 2910A is low VIN, high efficiency,
and dual 2A output µModule DC/DC converter. The
board operates by default at a fixed 2MHz and can be
synchronized from 1MHz to 3MHz via the MODE/SYNC
pin. With its high switching frequency and current mode
architecture, a fast transient response to line and load
changes is possible without sacrificing stability. The
DC2910A can be used in forced continuous mode or pulse
skip mode for low noise, or in burst mode operation for All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
BOARD PHOTO
high efficiency at light loads. The demo board features
the LTM
®
4691, which is available in a low profile 3mm
x 4mm x 1.2mm LGA package. Please see the LTM4691
datasheet for more detailed information.
It is recommended to read the data sheet for the LTM4691
prior to making any changes to the DC2910A.
Design files for this circuit board are available.
Specifications are at TA= 25°C
PARAMETER CONDITIONS VALUE
Input Voltage Range 2.35V to 3.6V
Output Voltage, VOUT VIN = 2.35V – 3.6V, IOUT = 0A to 2A VOUT1 = 1.2V
VOUT2 = 1.8V
Maximum Output Current, IOUT VIN = 2.35V – 3.6V 2A
Typical Efficiency VIN = 3.3V, VOUT1 = 1.2V, IOUT = 2A
VIN = 3.3V, VOUT2 = 1.8V, IOUT = 2A
84%
88%
Peak Efficiency VIN = 3.3V, VOUT1 = 1.2V
VIN = 3.3V, VOUT2 = 1.8V
89%
92%
Switching Frequency 2MHz

2
DEMO MANUAL DC2910A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2910A is easy to set up to evaluate
the performance of the LTM4691. Refer to Figure1 for
the proper measurement equipment setup and follow the
procedure below.
1. With power off, connect the input power supply to VIN
(2.35V-3.6V) and GND (input return).
2. Connect the output loads between VOUT and GND
(Initial load: no load). Refer to Figure1.
3. Connect the DVMs to the input and output.
4. Check the default jumper position: JP2 (RUN1): OFF;
JP3 (RUN2): OFF.
5. Turn on the input power supply and adjust voltage to
2.35V – 3.6V;
NOTE:Make sure that the input voltage does not exceed
4.0V.
6. Change the following jumpers’position: JP2:ON; JP3:ON.
7. Check for the proper output voltages from VOUT to GND
turrets.
8. Once the proper output voltage is established, adjust
the loads within the operating range and measure the
efficiency, output ripple voltage and other parameters.
9. After completing all tests, adjust the load to 0A, power
off the input power supply.
NOTES:
1. When measuring the output or input voltage ripple, do
not use the long ground lead on the oscilloscope probe.
See Figure3 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.

3
DEMO MANUAL DC2910A
Rev. 0
QUICK START PROCEDURE
+
–
+
+
+
–
Load
0A to 2A
Load
0A to 2A
––
––
+
–
–
+
–
Figure1. Proper Measurement Equipment Setup
Figure2. Measuring Output Voltage Ripple
Figure3. Efficiency vs. Load Current at VIN = 3.3V, VOUT1 = 1.2V, fSW = 2MHz
DC LOAD CURRENT (A)
0
EFFICIENCY (%)
95
65
85
75
90
80
70
60 1.5 210.5

4
DEMO MANUAL DC2910A
Rev. 0
DC LOAD CURRENT (A)
0
EFFICIENCY (%)
95
65
85
75
90
80
70
60 1.5 210.5
QUICK START PROCEDURE
Figure4. Efficiency vs. Load Current at VIN = 3.3V, VOUT2 = 1.8V, fSW = 2MHz
Figure5. Output Voltage Ripple at VIN = 3.3V, VOUT1 = 1.2V, fSW = 2MHz
Figure6. Output Voltage Ripple at VIN = 3.3V, VOUT2 = 1.8V, fSW = 2MHz
1μs/DIV
VOUT1
5mV/DIV
1μs/DIV
VOUT2
5mV/DIV

5
DEMO MANUAL DC2910A
Rev. 0
Figure7. Load Step at VIN = 3.3V, VOUT1 = 1.2V, fSW = 2MHz
Figure8. Load Step at VIN = 3.3V, VOUT2 = 1.8V, fSW = 2MHz
Figure9. Thermal performance at VIN = 3.3V, VOUT1 = 1.2V, VOUT2 = 1.8V, IOUT1 = 2A, IOUT2 = 2A TA = 23°C, No Forced Airflow
50μs/DIV
VOUT1
20mV/DIV
IOUT1
500mA/DIV
50ms/DIV
VOUT2
20mV/DIV
IOUT2
500mA/DIV

6
DEMO MANUAL DC2910A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C2 CAP., 10uF, X5R, 16V, 10%, 0603 MURATA, GRM188R61C106KAALD
2 2 C3, C4 CAP., 22uF, X6S, 6.3V, 20%, 0603 MURATA, GRM188C80J226ME15D
3 1 C5 CAP., 2.7pF, C0G, 50V, +/-0.25pF, 0402 MURATA, GJM1555C1H2R7CB01D
4 1 C6 CAP., 1.2pF, C0G, 50V, +/-0.05pF, 0402 MURATA, GJM1555C1H1R2WB01D
5 1 C7 CAP., 22uF, TANT. POSCAP, 6.3V, 20%, 2012 (0805)
S09, 150mOHM, TPU, NO SUBS. ALLOWED
KEMET, T529P226M006AAE150
6 1 C8 CAP., 220uF, TANT. POSCAP, 6.3V, 20%, 7343,
18mOHMS, TPE, NO SUBS. ALLOWED
PANASONIC, 6TPE220MI
7 1 R1 RES., 140k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED
8 2 R2, R4 RES., 100k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF1003X
9 1 R3 RES., 261k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW0402261KFKED
10 2 R5, R11 RES., 1M OHM, 5%, 1/16W, 0402 VISHAY, CRCW04021M00JNED
11 2 R6, R7 RES., 20 OHMS, 1%, 0.063W, 0402 VISHAY, CRCW040220R0FKED
12 1 R8 RES., 10k OHMS, 1%, 1/10W, 0402 PANASONIC, ERJ2RKF1002X
13 2 R9, R10 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
14 1 R12 RES., 10M OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040210M0FKED
15 1 U1 IC, Dual 2A Step-Down uMODULE REG, 24-PIN LGA ANALOG DEVICES, LTM4691EY#PBF
Additional Demo Board Circuit Components
1 0 C9-C12 CAP., OPTION, 0402
2 0 C13-C16 CAP., OPTION, 0603
Hardware: For Demo Board Only
1 11 E1-E11 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
2 2 JP2, JP3 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121
3 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.375" KEYSTONE, 8832
4 3 XJP1-XJP3 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

7
DEMO MANUAL DC2910A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
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
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS AND CAPACITORS ARE 0402.
REVISION HISTORY
ECO REV DESCRIPTION APPROVEDDATE
5 PROD 09/18/19 B L
m
VIN
VIN
VIN
VIN
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
Phone: [phone]
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES 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 ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
1 1
M I B L
DUAL 2A STEP-DOWN DC/DC MODULE REGULATOR
710-DC2910A_REV05
DC2910A
N/A
Tuesday, February 18, 2020
LTM4691EY
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
Phone: [phone]
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES 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 ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
1 1
M I B L
DUAL 2A STEP-DOWN DC/DC MODULE REGULATOR
710-DC2910A_REV05
DC2910A
N/A
Tuesday, February 18, 2020
LTM4691EY
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
Phone: [phone]
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES 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 ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
1 1
M I B L
DUAL 2A STEP-DOWN DC/DC MODULE REGULATOR
710-DC2910A_REV05
DC2910A
N/A
Tuesday, February 18, 2020
LTM4691EY
E7
GND
E9
GND
R5 1M
R10
100k
E11
RUN2
C14 OPT
TPB1
E8
MODE/
SYNC
C9
OPT
0402
R11 1M
E6
VOUT2
1.8V / 2A
C4 22uF
0603
6.3V
C6
1.2pF
TPB2
C3 22uF
0603
6.3V
C12
OPT
R4
100k 1%
C15 OPT
0603
R6 20
E1
VIN
2.35V-3.6V
+
C8 220uF
7343
12
C16 OPT
0603
R8 10k
1%
JP2
ON OFF
RUN1
1 3 2
R7
20
C13 OPT
E5
PGOOD
R9
100k
E2
GND
TPA1 TPA2
JP1
BURST
FC/SYNC
PULSE SKIP
MODE/SYNC
1 3 2 4
R2
100k 1%
C2 10uF
0603
U1 LTM4691-LGA
PGOOD
B1
VIN
C1
VOUT2 E1
GND
D1
FB2 A2
RUN2
B2
GND
C2
GND
D2
FB1 A3
RUN1
B3
GND
C3
MODE/SYNC
B4
GND
D3
GND
E3
AGND2
A1
AGND1
A4
VIN
C4
GND
D4
GND
E2
VOUT1 E4 VOUT1 F3 VOUT1 F4 VOUT2 F2 VOUT2 F1
R12
10M
1%
E10
RUN1
E4
GND
C10
OPT
0402
C5
2.7pF
+
C7
22uF
2012
R1
140k 1%
C1 10uF
0603
JP3
ON OFF
RUN2
1 3 2
E3
VOUT1
1.2V / 2A
C11
OPT
R3
261k 1%
VIN
PGOOD
RUN1
RUN2
FB1
VOUT1
FB2
MODE/SYNC
VOUT2

8
DEMO MANUAL DC2910A
Rev. 0
 ANALOG DEVICES, INC. 2020
02/20
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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