1
DEMO MANUAL DC2902A
Rev. 0
DESCRIPTION
LTM4663
Ultrathin 1.5A Thermoelectric Cooler
(TEC) μModule Regulator
Demonstration circuit 2902A is a thermoelectric cooler
(TEC) regulator featuring the LTM
®
4663 μModule regu-
lator. The demo board has a 2.7V to 5.5V input voltage
range and can deliver up to 1.5A of sinking or sourcing
current. Inside the LTM4663, a linear power stage works
together with a PWM power stage to form an H-bridge
configuration. The direction of the current fed through the
TEC can be either positive (for cooling mode), or negative
(for heating mode). The LTM4663 has two built-in zero
drift, rail-to-rail chopper amplifiers which can serve as a
thermistor input amplifier and form an analog tempera-
ture control loop. The LTM4663 provides a 1% accuracy
2.5V internal reference voltage to bias the thermistor tem-
perature sensing circuit and to program the maximum
TEC current and voltage limits for both the cooling and
heating modes.
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
BOARD PHOTO
The demo board has a default 2MHz switching frequency
and can be synchronized to an external clock from
1.85MHz to 3.25MHz applied to the EN/SY input pin
(JP1: EN/SY). The clock high level must be above 2.1V
and the clock low level must be below 0.8V. Maximum
TEC current limit can be programmed with a resistor, R7
(default: 1.5A for cooling mode; –1.5A for heating mode).
Maximum TEC voltage limit can be programmed with a
resistor, R10 (default: 5V for cooling mode; –4.8V for heat-
ing mode). Other features include VTEC output for TEC
voltage monitor and ITEC output for TEC current monitor.
The LTM4663 datasheet gives a complete description of
the operation and application information. The datasheet
must be read in conjunction with this demo manual.
Design files for this circuit board are available.
Specifications are at TA = 25°C
PARAMETER CONDITIONS VALUE
Input Voltage Range 2.7V to 5.5V
Maximum TEC Current Cooling mode 1.5A
Maximum TEC Current Heating mode –1.5A
Typical Switching Frequency 2MHz
Typical Efficiency Cooling mode, VIN = 5V, ITEC = 1.5A, 2Ω load 88.6%
Typical Efficiency Heating mode, VIN = 5V, ITEC = –1.5A, 2Ω load 89.1%
2
DEMO MANUAL DC2902A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2902A is easy to set up to evaluate
the performance of the LTM4663. Refer to Figure1 for
the proper measurement setup and follow the procedure
below:
1. With power off, connect the input power supply to
VIN(2.7V-5.5V) and GND (input return).
2. Many users do not have a real TEC, or do not want
to use a real TEC for initial tests. In these cases, you
may use a proper power resistor as a load to test the
operation of the LTM4663, by connecting the resistor
to TEC+ and TEC– terminals. Set jumper JP1 to “on”
position, and jumper JP2 to “POT” position.
3. Connect the DVMs to the input and outputs.
4. Turn on the input power supply (V
IN
= 3.3V recom-
mended) and check for the voltage across the TEC
+
and TEC– terminals, and the current through the load.
5. Use a small screwdriver to adjust the potentiometer
(R18). check for the voltage across the TEC+ and TEC–
terminals, and the current through the load. Observe
the changes of value and direction of the voltage across
the TEC+ and TEC– terminals, and the current through
the load. (Positive TEC voltage: cooling mode; negative
TEC voltage: heating mode).
6. Adjust the VIN within the operating range (2.7V-5.5V)
and repeat step 5. Observe the voltage across the TEC+
and TEC– terminals, and the current through the load,
efficiency, maximum TEC current limits, maximum TEC
voltage limits and other features.
Notes:
a. To test the LTM4663 with a suitable TEC, connect the
TEC to TEC+ and TEC– terminals. Observe TEC polarity.
b. For real TEC thermal system, connect a thermistor
(NTC) between the Thermistor terminal and ground
terminal. Set jumper JP2 to “NTC”.
c. When using a power resistor as a load for testing, make
sure it has high enough power rating. Recommend a
power resistor with 10W rating. Proper cooling may be
needed for the power resistor.
Figure1. Proper Measurement Setup
3
DEMO MANUAL DC2902A
Rev. 0
QUICK START PROCEDURE
Figure2. Efficiency vs TEC current (Cooling mode, 2Ω load)
Figure4. Typical Enable waveforms (Cooling mode, VIN = 3.3V,
2Ω load, TEC current = 1.4A)
Figure3. Efficiency vs TEC current (Heating mode, 2Ω load)
Figure5. Typical Enable waveforms (Heating mode, VIN = 3.3V,
2Ω load, TEC current = –1.2A)
0
10
20
30
40
50
60
70
80
90
100
0 0.5 1.0 1.5
EFFICIENCY (%)
TEC CURRENT (A)
VIN = 3.3V
VIN = 5V
0
10
20
30
40
50
60
70
80
90
100
0 –0.5 –1.0 –
1.5
EFFICIENCY (%)
TEC CURRENT (A)
VIN = 3.3V
VIN = 5V
50ms/DIV
EN
2V/DIV
TEC CURRENT
1A/DIV
TEC+
2V/DIV
TEC–
2V/DIV
50ms/DIV
EN
2V/DIV
TEC CURRENT
1A/DIV
TEC–
2V/DIV
TEC+
2V/DIV
4
DEMO MANUAL DC2902A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C7, C12 CAP., 10uF, X5R, 6.3V, 10%, 0603 MURATA, GRM188R60J106KE47D
2 1 C5 CAP., 1uF, X5R, 6.3V, 10%, 0603 MURATA, GRM188R60J105KA01D
3 1 C8 CAP., 0.1uF, X7R, 6.3V, 10%, 0603 KEMET, C0603C104K9RAC7867
4 1 C10 CAP., 0.01uF, X5R, 50V, 10%, 0603 MURATA, GRM188R61H103KA01D
5 1 C14 CAP., 1.5uF, X7R, 10V, 10%, 0603 TDK, C1608X7R1A155K080AC
6 1 R1 RES., 15k OHMS, 1%, 1/10W, 0603 YAGEO, RC0603FR-0715KL
7 1 R7 RES., 49.9k OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF4992V
8 3 R11, R16, R29 RES., 0 OHM, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA
9 2 R13, R15 RES., 10k OHMS, 1%, 1/10W, 0603, AEC-Q200 KOA SPEER, RK73H1JTTD1002F
10 1 R17 RES., 100k OHMS, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1003TRF
11 1 R18 RES., 20K OHMS, 10%, 1/4W, SMD 4.8x3.9mm, 12
TURN, TOP ADJUST, TRIMPOT
BOURNS, 3224W-1-203E
12 2 R25, R28 RES., 1.87M OHMS, 1%, 1/10W, 0603 VISHAY, CRCW06031M87FKEA
13 1 R27 RES., 165k OHMS, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603165KFKEA
14 1 U1 IC, 1.5A TEC μMODULE REGULATOR, LGA ANALOG DEVICES, LTM4663EV#PBF
Additional Demo Board Circuit Components
15 0 R10 RES., OPTION, 0603
Hardware: For Demo Board Only
16 10 E1, E2, E3, E10, E11,
E14, E16, E17, E18, E19
TEST POINT, TURRET, 0.064" MTG. HOLE, PCB
0.062" THK
MILL-MAX, 2308-2-00-80-00-00-07-0
17 2 J1, J2 CONN., BANANA JACK, FEMALE, THT, NON-
INSULATED, SWAGE, 0.218"
KEYSTONE, 575-4
18 1 JP1 CONN., HDR., MALE, 2x3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121
19 1 JP2 CONN., HDR., MALE, 1x3, 2mm, VERT, STR, THT SULLINS CONNECTOR SOLUTIONS,
NRPN031PAEN-RC
20 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2902A
21 2 STENCILS (TOP & BOTTOM) STENCIL DC2902A
22 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE, 8833
23 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
5
DEMO MANUAL DC2902A
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.
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C7, C12 CAP., 10uF, X5R, 6.3V, 10%, 0603 MURATA, GRM188R60J106KE47D
2 1 C5 CAP., 1uF, X5R, 6.3V, 10%, 0603 MURATA, GRM188R60J105KA01D
3 1 C8 CAP., 0.1uF, X7R, 6.3V, 10%, 0603 KEMET, C0603C104K9RAC7867
4 1 C10 CAP., 0.01uF, X5R, 50V, 10%, 0603 MURATA, GRM188R61H103KA01D
5 1 C14 CAP., 1.5uF, X7R, 10V, 10%, 0603 TDK, C1608X7R1A155K080AC
6 1 R1 RES., 15k OHMS, 1%, 1/10W, 0603 YAGEO, RC0603FR-0715KL
7 1 R7 RES., 49.9k OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF4992V
8 3 R11, R16, R29 RES., 0 OHM, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA
9 2 R13, R15 RES., 10k OHMS, 1%, 1/10W, 0603, AEC-Q200 KOA SPEER, RK73H1JTTD1002F
10 1 R17 RES., 100k OHMS, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1003TRF
11 1 R18 RES., 20K OHMS, 10%, 1/4W, SMD 4.8x3.9mm, 12
TURN, TOP ADJUST, TRIMPOT
BOURNS, 3224W-1-203E
12 2 R25, R28 RES., 1.87M OHMS, 1%, 1/10W, 0603 VISHAY, CRCW06031M87FKEA
13 1 R27 RES., 165k OHMS, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603165KFKEA
14 1 U1 IC, 1.5A TEC μMODULE REGULATOR, LGA ANALOG DEVICES, LTM4663EV#PBF
Additional Demo Board Circuit Components
15 0 R10 RES., OPTION, 0603
Hardware: For Demo Board Only
16 10 E1, E2, E3, E10, E11,
E14, E16, E17, E18, E19
TEST POINT, TURRET, 0.064" MTG. HOLE, PCB
0.062" THK
MILL-MAX, 2308-2-00-80-00-00-07-0
17 2 J1, J2 CONN., BANANA JACK, FEMALE, THT, NON-
INSULATED, SWAGE, 0.218"
KEYSTONE, 575-4
18 1 JP1 CONN., HDR., MALE, 2x3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121
19 1 JP2 CONN., HDR., MALE, 1x3, 2mm, VERT, STR, THT SULLINS CONNECTOR SOLUTIONS,
NRPN031PAEN-RC
20 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2902A
21 2 STENCILS (TOP & BOTTOM) STENCIL DC2902A
22 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE, 8833
23 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
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 0603.
2.7V - 5.5V
VIN
GND
REVISION HISTORY
APPROVEDECO DESCRIPTION DATEREV
CZ
ON
OFF
EN/SY
PRODUCTION 11-15-19
2
SW
LTM4663-EV
VIN
VIN SVIN
SVIN
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
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.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
LT
CZ
LTM4663EV
ULTRA TINY 1.5A TEC uMODULE REGULATOR
DC2902A 710-DC2902A_REV02
N/A
Friday, November 15, 2019DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
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.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
LT
CZ
LTM4663EV
ULTRA TINY 1.5A TEC uMODULE REGULATOR
DC2902A 710-DC2902A_REV02
N/A
Friday, November 15, 2019DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
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.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
LT
CZ
LTM4663EV
ULTRA TINY 1.5A TEC uMODULE REGULATOR
DC2902A 710-DC2902A_REV02
N/A
Friday, November 15, 2019
E14
TEC+
R7 49.9k
E3
ITEC
E17
GND
JP2
POT
NTC
1
3
2
JP1
EN/SY
12
34
56
C10
0.01uF
R15
10k
R17
100k
E1
EN/SY
C5
1uF
6.3V
R18
20k
13
2
E19
GND
R10 OPT
E18
THERMISTOR
R29
0
E10
VIN
R25
1.87M
E16
TEC-
1
R13
10k
R1
15k
C8
0.1uF
6.3V
R27
165k
E2
VTEC
R11
0
C12
10uF
E11
GND
J2
J1
R16
0
R28
1.87M
C14
1.5uF
U1
VLDR B4
PVIN
A3
SFB C1
VLDR A4
PAMPOUT
D3
TFB
C4
PAMPN
D4
VREF
E1
TAMPOUT
C5
EN/SY D2
VTEC C2
ITEC C3
GNDA D1
VLIM/SD E4
SVIN
E2
SW A2
SW B2
TSET
E5
ILIM E3
VPWM B1
GNDP A1
GNDL A5
GNDL B5
PVIN
B3
NC D5
C1
10uF
6.3V
C7
10uF
6.3V
TAMPOUT
TAMPOUT
6
DEMO MANUAL DC2902A
Rev. 0
ANALOG DEVICES, INC. 2020
09/20
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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