ANALOG DEVICES DC2383A-B Evaluation Board User Guide
- June 4, 2024
- Analog Devices
Table of Contents
DC2383A-B Evaluation Board
User Guide
Quad 17V, 1.25A Synchronous Step-DownRegulator with Ultralow Quiescent Current
DESCRIPTION
Demonstration circuit 2383A-B features the LT ® 3644-2: the wide input and
output voltage range, high efficiency and power density, quad 1.25A outputs
DC/DC synchronous step-down monolithic regulator. The input voltage range of
DC2383A-A is 2.7V to 17V. The default demo board setting of VOUT1, VOUT2,
VOUT3, and VOUT4 is 1.2V, 3.3V, 2.5V, and 1.8V at 1.25A maximum DC output
current per channel. There are two assembly versions. The DC2383A-B features
LTC3644-2 which operates at an internally fixed frequency of 2.25MHz (Typ),
while the DC2383A-A features LTC3644 which operates at an internally fixed
frequency of 1MHz (Typ). Peak current limit is internally fixed at 2.2A
typical per channel. Each channel comes with independent run pin control and
power good indicators. Phase shift selection of either 0 degrees or 180
degrees between switch rising edge of channels 1, 2 and channels 3, 4 is also
available.
DC2383A-B provides optional onboard 0Ω jumpers to configure the LTC3644-2 as
4-phase dual 2.5A/2.5A outputs or 4-phase triple 2.5A/1.25A/1.25A outputs.
Optional 0Ω jumpers connecting VIN1 to VIN2, VIN3, and
VIN4 are available for users to operate selected channels of LTC3644-2 at
different input voltages than VIN1.
A user-selectable MODE/SYNC input is provided to allow users to trade off
ripple noise for light load efficiency: pulse-skipping mode (PS) or Burst Mode
® operation delivers higher efficiency at light load while forced continuous
conduction mode (FCM) is preferred for noise sensitive applications. The
MODE/SYNC pin can also be used to synchronize the switching frequency to an
external clock or set the phase shift between channels 1, 2, and channels 3,
4. Constant frequency, peak current mode control architecture and integrated
internal control loop compensation network, allows very fast transient
response to line and load changes while maintaining loop stability.
The LTC3644-2 is available in a thermally enhanced, low-profile 36-lead 5mm x
5mm BGA package. It is recommended to read the LTC3644-2 datasheet and demo
board manual prior to using or making any changes to DC2383A-B.
PERFORMANCE SUMMARY
Specifications are at TA = 25°
| PARAMETER | CONDITIONS | MIN | TYP | MAX | UNITS |
|---|---|---|---|---|---|
| Input Voltage Range VIN | 2.7 | 17 | V | ||
| Demo Board Default Output Voltages VOUT1, VOUT2, VOUT3, VOUT4 | FSW = 2.25 |
MHzBurst Mode
VIN = 2.7V to 17V (VOUT < VIN)
ILOAD = 0A to 1.25A per Channel| 1.176 3.234 2.45 1.764| 1.2 3.3
2.5 1.8| 1.224 .366
2.55
1.836| V
Default Switching Frequency| Internally Fixed Switching Frequency| 1.8| 2.25|
2.6| MHz
Maximum Continuous Output Current IOUT per Channel IOUT1, IOUT2, IOUT3, IOUT4|
FSW = 2.25MHz VIN = 2.7V to 17V (VOUT < VIN) VOUT = 1.2V, 1.8V, 2.5V, 3.3V|
1.25| A
Efficiency at DC| VIN = 5V FSW = 2.25MHz| 125| %
VOUT1 = 1.2V at IOUT1 = 1A| 80.6
VOUT2 = 3.3V at IOUT2 = 1A| 88.1
VOUT3 = 2.5V at IOUT3 = 1A| 86.2
VOUT4 = 1.8V at IOUT4 = 1A| 84.7
QUICK START PROCEDURE
The MODE/SYNC pin can be used to synchronize the internal oscillator clock
frequency to the external clock signal. Place JP3 (MODE/PLLIN) at the CLKIN
position, apply an external clock signal at the CLKIN test point (E10) to vary
the switching frequency within ±50% of the internal programmed frequency.
The MODE/SYNC pin can also be used to set the phase shift between channels 1,
2 and channels 3, 4 while keeping the PHASE pin tied to INTVCC. The phase
shift can be set by modulating the duty cycle of an external clock on the
MODE/SYNC pin. In this case, the phase shift will be determined by the applied
external clock rising and falling edges. The switch rising edge of channels 1,
2 is synced to the rising edge of the external clock and the switch rising
edge of channels 3, 4 is synced to the falling edge of the external clock.
Crosstalk between channels can be avoided by adjusting the phase shift between
channels such that the SW edges do not coincide.
(Option) 4-Phase Dual 2.5A/2.5A Output Current Configuration:
DC2383A-B can be configured as dual 2.5A/2.5A outputs.
Channel 1 and channel 4 are master channels, and channel 2 and channel 3 are
slaves.
The following simple modification is required:
- Tie VIN1, VIN2, VIN3, and VIN4 together or tie VIN1 and VIN2, VIN3 and VIN4 together if operating channels 1 and channel 2 at different input voltage than that of channel 3 and channel 4. Make sure SVIN is tied to the highest input supply voltage.
- Tie SW1 and SW2, SW3 and SW4 together. Since SW1 and SW2, SW3 and SW4 are tied together, there is only one inductor needed for each output voltage rail. Calculate and insert the inductors needed for L1 and L4, and remove L2 and L3.
- Tie FB2 and FB3 to INTVCC.
- Float (do not use) PGOOD2 and PGOOD3. Only PGOOD1 and PGOOD4 are active.
- Tie RUN1 and RUN2, RUN3 and RUN4 together. Note: Make sure to float all the unused onboard RUN pin jumpers to avoid accidentally shorting VIN to GND.
- Tie PHASE pin to INTVCC. Refer to the demo board DC2383A-B schematic for more details.
(Option) 4-Phase Triple 2.5A/1.25A/1.25A Output Circuit Configuration:
DC2383A-B can be configured as triple 2.5A/1.25A/1.25A outputs.
Channel 1 is a master channel, channel 2 is a slave. Channel 3 and channel 4
are independent channels.
The following simple modification is required:
- Tie VIN1, VIN2, VIN3, and VIN4 together, or tie VIN1 and VIN2 together, and VIN3 and VIN4 can be at different input voltages than VIN1 and VIN2. Make sure SVIN is tied to the highest input supply voltage.
- Tie SW1 and SW2 together. There is only one inductor needed for this output voltage rail. Calculate and insert the inductor needed for L1 and remove L2.
- Tie FB2 to INTVCC.
- Float (do not use) PGOOD2. Only PGOOD1, PGOOD3, and PGOOD4 are active.
- Tie RUN1 and RUN2 together. Note: Make sure to float all unused onboard RUN pin jumpers to avoid accidentally shorting VING to GND.
- Tie PHASE pin to INTVCC.
- Channel 3 and Channel 4 are left unchanged since these two channels operate as independent channels.
Refer to the demo board DC2383A-B schematic for more details.
QUICK START PROCEDURE
|
---|---
QUICK START PROCEDURE
Figure 3. Measured Efficiency at VIN = 5V, FSW = 2.25MHz, Burst Mode
VOUT1 = 1.2V, VOUT2 = 3.3V, VOUT3 = 2.5V, VOUT4 = 1.8V
ILOAD = 1.25A per Channel
TA = 25°C, No Heat Sink, No Forced Airflow
Figure 4. Thermal Performance at VIN = 5V, fSW = 2.25MHz
(a) Load Transient Response: VIN = 8V, VOUT = 1.2V| (b) Load Transient
Response: VIN = 12V, VOUT = 1.8V
(c) Load Transient Response: VIN = 12V, VOUT = 2.5V| (d) Load Transient
Response: VIN = 12V, VOUT = 3.3V
Figure 5. Load Transient Responses
Load Transient Response Test Conditions:
FSW = 2.25MHz Typical
VOUT1 = 1.2V, VOUT2 = 3.3V, VOUT3 = 2.5V, VOUT4 = 1.8V
L1 = L4 = 1µH
L2 = L3 = 2.2µH
Load Step = 0.625A to 1.25A at di/dt = 1A/µs
COUT_ceramic = 1×47µF/1206 + 1x10uF/1206 (per Channel)
Feedforward Capacitor: CFF = 68pF (per Channel)
PARTS LIST
ITEM| QTY| REFERENCE| PART DESCRIPTION|
MANUFACTURER/PART NUMBER
---|---|---|---|---
Required Circuit Components
1| 4| CFF1, CFF2, CFF3, CFF4| CAP, 0402 68pF 5% 50V C0G| MURATA,
GRM1555C1H680JA01D
---|---|---|---|---
2| 1| C1| CAP. 2917 22uF 20% 35V TANT| AVX, TPSE226M035R0125
3| 7| C2, C4, C5, C7, C9, C10, C14| CAP, 0805 10uF 10% 25V X5R| MURATA,
GRM21BR61E106KA73L
4| 5| C3, C6, C11, C12, C15| CAP, 0603 4.7uF 20% 25V X5R| MURATA,
GRM188R61E475ME11D
5| 1| C16| CAP, 0603 1uF 10% 25V X7R| MURATA, GRM188R71E105KA12D
6| 4| C19, C21, C23, C25| CAP, 1206 47uF 10% 16V X5R| MURATA,
GRM31CR61C476ME44L
7| 4| C20, C22, C24, C26| CAP, 1206 10uF 10% 25V X7R| KEMET, C1206C106K3RACTU
8| 2| L1, L4| IND, 1uH| MURATA, DFE252012F-1R0M
9| 2| L2, L3| IND, 2.2uH| MURATA, DFE252012F-2R2M
10| 5| RSET1, RSET2, RSET3, RSET4, R25| RES, 0402 100K OHM 1% 1/16W|
PANASONIC, ERJ2RKF1003X
11| 9| R1, R2, R9, R13, R14, R17, R18, R23, R24| RES, 0402 0 OHM JUMPER|
VISHAY, CRCW04020000Z0ED
12| 4| R3, R4, R5, R6| RES, 0402 100k OHMS 1% 1/16W| VISHAY, CRCW0402100KFKED
13| 1| R7| RES, 0402 2.2 OHMS 1% 1/16W| VISHAY, CRCW04022R20FNED
14| 6| R8, R10, R11, R12, R15, R16| RES, 0402 10M OHMS 1% 1/16W| VISHAY,
CRCW040210M0FKED
15| 1| R19| RES, 0402 22.1K OHMS 1% 1/16W| VISHAY, CRCW040222K1FKED
16| 1| R22| RES, 0402 31.6K OHM 1% 1/16W| VISHAY, CRCW040231K6FKED
17| 1| R28| RES, 0402 49.9K OHMS 1% 1/16W| VISHAY, CRCW040249K9FKED
18| 3| R29, R30, R31| RES, 0805 0 OHM JUMPER| VISHAY, CRCW08050000Z0EA
19| 1| U1| IC, QUAD 17V, 1.25A SYNCHRONOUS STEP-DOWN REGULATOR| ANALOG
DEVICES, LTC3644EY-2
Additional Demo Board Circuit Components
| 1 | 0 | C8, C13, C17, C18 | CAP, 0402 OPTION | OPTION |
|---|---|---|---|---|
| 2 | 0 | C27, C28, C29, C30 | CAP, 1206 OPTION | OPTION |
| 3 | 0 | R20, R21, R26, R27 | RES, 0402 OPTION | OPTION |
| 4 | 0 | R32 | RES, 1206 OPTION | OPTION |
| 5 | 0 | R33, R34, R37, R38, R39 | RES, 0603 OPTION | OPTION |
| 6 | 0 | R35, R36 | RES, 0805 OPTION | OPTION |
Hardware: For Demo Board Only
1| 16| E1, E2, E3, E4, E5, E6, E7, E12, E14, E15, E16, E17, E18, E19, E20,
E21| TURRET| MILL-MAX, 2501-2-00-80-00-00-07-0
---|---|---|---|---
2| 10| E8, E9, E10, E11, E13, E22, E23, E24, E25, E26| TURRET| MILL-MAX,
2308-2-00-80-00-00-07-0
3| 5| JP1, JP2, JP4, JP5, JP6| HEADER, 3PIN, 2mm| WURTH, ELEKTRONIK,
62000311121
4| 1| JP3| HEADER, 2X4PINS 2mm| WURTH, ELEKTRONIK, 62000821121
5| 4| JP7, JP8, JP9, JP10| HEADER, 2PIN, DBL ROW 2mm| WURTH, ELEKTRONIK,
62000421121
6| 4| MH1, MH2, MH3, MH4| STANDOFF, SNAP ON 12.7mm| WURTH, ELEKTRONIK,
702935000
7| 10| XJP1, XJP2, XJP3, XJP4, XJP5, XJP6, XJP7, XJP8, XJP9, XJP10| SHUNT,
2mm| WURTH, ELEKTRONIK, 60800213421
SCHEMATIC DIAGRAM
SCHEMATIC DIAGRAM
OPTIONAL JUMPERS FOR PARALLELING PHASES FOR DESIRED NUMBER OF OUTPUT
VOLTAGE RAILS (SHARING THE SAME VIN1)
NUMBER OF OUTPUT VOLTAGE RAILS| Paralleling Channel| Master Channel| 0 OHM
(Required)| OPT (Do not stuff)| PHASE (JP13)
---|---|---|---|---|---
QUAD 1.25A 4| 1/2/3/4| | | R33, R34, R35, R36,
R37, R38, R39| INTVCC
TRIPLE 2.5A/1.25A/1.25A 3| 1+2/3/4| 1| R33, R35, R37| R4, R9, R10,
R17, RSET2, CFF2, R19, R34, R36, R38, R39, L2, JP2| INTVCC
DUAL 2.5A/2.5A 2| 1+2/3+4| 1, 4| R33, R34, R35, R36,
R37, R38| R4, R5, R9, R10, R13, R15, R17, R18, RSET2, RSET3, CFF2, CFF3, R19,
R22, R39 L2, L3, JP2, JP5| INTVCC
NOTE:
Please refer to the datasheet and demo board manual for more details and
examples of paralleling phases to obtain the desired number of output voltage
rails.
CUSTOMER NOTICE
ANALOG DEVISES INC. HAS MADE THE 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 NALOG
DEVICES INC. APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES INC. AND SUPPLIED FOR USE WITH
ANALOG DEVICES INC. PARTS.
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 f 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 atent or patent rights of Analog Devices.
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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