ANALOG DEVICES DC2383A-B Evaluation Board User Guide

Xunta de avaliación DC2383A-B
Guía do Usuario

Quad 17V, 1.25A Synchronous Step-DownRegulator with Ultralow Quiescent Current

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1 DESCRICIÓN

2 RESUMO DE ACTUACIÓN

3 PROCEDEMENTO DE INICIO RÁPIDO

4 LISTA DE PEZAS

5 Documentos/Recursos

5.1 References

5.2 Manuais/Recursos relacionados

DESCRICIÓN

Demonstration circuit 2383A-B features the LT ® 3644-2: the wide input and output voltagRango e, alta eficiencia e densidade de potencia, quad saídas de 1.25 A DC/DC regulador monolítico reductor síncrono. A entrada 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.

RESUMO DE ACTUACIÓN

Specifications are at TA = 25°

PARÁMETRO	CONDICIÓNS	MIN	TYP	MAX	UNIDADES
Vol. De entradatage Rango 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	1.224 .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

PROCEDEMENTO DE INICIO RÁPIDO
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.

PROCEDEMENTO DE INICIO RÁPIDO

ANALOG DEVICES DC2383A-B Evaluation Board - Fig

ANALOG DEVICES DC2383A-B Evaluation Board - Fig 1

PROCEDEMENTO DE INICIO RÁPIDO

Figura 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
Figura 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)

LISTA DE PEZAS

ITEM

QTY

REFERENCIA

Descrición da peza

FABRICANTE/NÚMERO DE PARTE

Compoñentes de circuíto necesarios

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

Compoñentes adicionais do circuíto da placa de demostración

1	C8, C13, C17, C18	CAP, 0402 OPTION	OPCIÓN
2	C27, C28, C29, C30	CAP, 1206 OPTION	OPCIÓN
3	R20, R21, R26, R27	RES, 0402 OPTION	OPCIÓN
4	R32	RES, 1206 OPTION	OPCIÓN
5	R33, R34, R37, R38, R39	RES, 0603 OPTION	OPCIÓN
6	R35, R36	RES, 0805 OPTION	OPCIÓN

Hardware: só para placa de demostración

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

DIAGRAMA ESQUEMÁTICO

DIAGRAMA ESQUEMÁTICO
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

NOTA:
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 carrís.
AVISO Á CLIENTE
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.

Precaución ESD
Dispositivo sensible a descargas electrostáticas (ESD). Os dispositivos cargados e as placas de circuítos poden descargarse sen detectalos. Aínda que este produto dispón de circuítos de protección patentados ou propietarios, pódense producir danos nos dispositivos sometidos a ESD de alta enerxía. Polo tanto, débense tomar as precaucións de ESD adecuadas para evitar a degradación do rendemento ou a perda de funcionalidade.
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