Lógó ANALOGBord Measúnaithe DC2383A-B
Treoir d'Úsáideoirí

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

CUR SÍOS

Demonstration circuit 2383A-B features the LT ® 3644-2: the wide input and output voltage raon, éifeachtacht ard agus dlús cumhachta, aschur quad 1.25A DC/DC rialtóir monolithic sioncrónach céim síos. Tá an t-ionchur 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.

ACHOIMRE FEIDHMÍOCHTA

Specifications are at TA = 25°

PARAMETER COINNÍOLLACHA MIN CI MAX AONAD
Ionchur Voltage Raon 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

NÓS IMEACHTA TOSAIGH CEART
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:

  1. 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.
  2. 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.
  3. Tie FB2 and FB3 to INTVCC.
  4. Float (do not use) PGOOD2 and PGOOD3. Only PGOOD1 and PGOOD4 are active.
  5. 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.
  6. 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:

  1. 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.
  2. 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.
  3. Tie FB2 to INTVCC.
  4. Float (do not use) PGOOD2. Only PGOOD1, PGOOD3, and PGOOD4 are active.
  5. Tie RUN1 and RUN2 together. Note: Make sure to float all unused onboard RUN pin jumpers to avoid accidentally shorting VING to GND.
  6. Tie PHASE pin to INTVCC.
  7. 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.

NÓS IMEACHTA TOSAIGH CEART

ANALOG DEVICES DC2383A-B Evaluation Board - Fig ANALOG DEVICES DC2383A-B Evaluation Board - Fig 1

NÓS IMEACHTA TOSAIGH CEART

ANALOG DEVICES DC2383A-B Evaluation Board - Fig 2

Fíor 3. Measured Efficiency at VIN = 5V, FSW = 2.25MHz, Burst Mode

ANALOG DEVICES DC2383A-B Evaluation Board - Fig 3

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
Fíor 4. Thermal Performance at VIN = 5V, fSW = 2.25MHz

ANALOG DEVICES DC2383A-B Evaluation Board - Fig 4
(a) Load Transient Response: VIN = 8V, VOUT = 1.2V (b) Load Transient Response: VIN = 12V, VOUT = 1.8V
ANALOG DEVICES DC2383A-B Evaluation Board - Fig 5
(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)

CODANNA LIOSTA

ITEM Qty TAGARTHA CUR SÍOS CUID MONARÓIR/PÁIRTUIMHIR

Comhpháirteanna Cuarda Riachtanach

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

Comhpháirteanna Breise Ciorcaid an Bhoird Taispeána

1 0 C8, C13, C17, C18 CAP, 0402 OPTION ROGHA
2 0 C27, C28, C29, C30 CAP, 1206 OPTION ROGHA
3 0 R20, R21, R26, R27 RES, 0402 OPTION ROGHA
4 0 R32 RES, 1206 OPTION ROGHA
5 0 R33, R34, R37, R38, R39 RES, 0603 OPTION ROGHA
6 0 R35, R36 RES, 0805 OPTION ROGHA

Crua-earraí: Don Bhord Taispeána Amháin

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

DIAGRAM SCÉIME

ANALOG DEVICES DC2383A-B Evaluation Board - Fig 8

DIAGRAM SCÉIME
OPTIONAL JUMPERS FOR PARALLELING PHASES FOR DESIRED NUMBER OF OUTPUT VOLTAGE RAILS (SHARING THE SAME VIN1)

ANALOG DEVICES DC2383A-B Evaluation Board - Fig 10

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

NÓTA:
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 ráillí.
FÓGRA DO CHUSTAIMÉIRÍ
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.

ANALOG DEVICES DC2383A-B Evaluation Board - Fig 16

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.

ANALOG DEVICES DC2383A-B Evaluation Board - Fig 11 Rabhadh ESD
Gléas íogair ESD (urscaoileadh leictreastatach). Is féidir le feistí luchtaithe agus cláir chiorcaid urscaoileadh gan bhrath. Cé go bhfuil ciorcaid chosanta paitinnithe nó dílseánaigh ag baint leis an táirge seo, d’fhéadfadh damáiste tarlú d’fheistí atá faoi réir ESD ardfhuinnimh. Dá bhrí sin, ba cheart réamhchúraimí cuí ESD a ghlacadh chun díghrádú feidhmíochta nó cailliúint feidhmiúlachta a sheachaint.
Téarmaí agus Coinníollacha Dlíthiúla
Trí úsáid a bhaint as an mbord meastóireachta a phléitear anseo (mar aon le haon uirlisí, doiciméadú comhpháirteanna nó ábhar tacaíochta, an “Bord Meastóireachta”), aontaíonn tú a bheith faoi cheangal ag na téarmaí agus coinníollacha atá leagtha amach anseo (“Comhaontú”) mura bhfuil an An Bord Meastóireachta, agus sa chás sin is iad Téarmaí agus Coinníollacha Caighdeánacha Díolacháin na bhFeistí Analógacha a rialóidh. Ná húsáid an Bord Measúnaithe go dtí go mbeidh an Comhaontú léite agus aontaithe agat. Is léiriú é an úsáid a bhaineann tú as an mBord Measúnaithe go bhfuil tú ag glacadh leis an gComhaontú. Déanann tú féin agus idir tú féin an Comhaontú seo (“Custaiméir”) agus Analog Devices, Inc. (“ADI”), lena phríomhionad gnó ag One Technology Way, Norwood, MA 02062, SAM. Faoi réir théarmaí agus choinníollacha an Chomhaontaithe, deonaíonn ADI leis seo ceadúnas in aisce, teoranta, pearsanta, sealadach, neamheisiatach, neamh-focheadúnaithe, neamh-inaistrithe chun an Bord Measúnaithe a úsáid CHUN CRÍOCHA MHEASÚNAITHE AMHÁIN. Tuigeann an custaiméir agus aontaíonn sé go gcuirtear an Bord Meastóireachta ar fáil don chuspóir aonair agus eisiach dá dtagraítear thuas, agus aontaíonn sé gan an Bord Meastóireachta a úsáid chun aon chríche eile. Ina theannta sin, déantar an ceadúnas a dheonaítear go sainráite faoi réir na dteorainneacha breise seo a leanas: Ní dhéanfaidh an custaiméir (i) an Bord Meastóireachta a ligean ar cíos, a léasú, a thaispeáint, a dhíol, a aistriú, a shannadh, a fhocheadúnais nó a dháileadh; agus (ii) cead a thabhairt d’aon Tríú Páirtí rochtain a fháil ar an mBord Meastóireachta. Mar a úsáidtear anseo, folaíonn an téarma “Tríú Páirtí” aon eintiteas seachas ADI, Custaiméir, a bhfostaithe, a chleamhnaithe agus a gcomhairleoirí inmheánacha. NÍ dhíoltar an Bord Measúnaithe leis an gCustaiméir; tá gach ceart nach ndeonaítear go sainráite anseo, lena n-áirítear úinéireacht an Bhoird Mheastóireachta, forchoimeádta ag ADI. RÚNDACHT. Déanfar an Comhaontú seo agus an Bord Meastóireachta ar fad a mheas mar fhaisnéis rúnda agus dhílseánaigh ADI. Ní fhéadfaidh an custaiméir aon chuid den Bhord Meastóireachta a nochtadh nó a aistriú chuig páirtí ar bith eile ar chúis ar bith. Nuair a scoirtear d’úsáid an Bhoird Mheastóireachta nó nuair a chuirtear deireadh leis an gComhaontú seo, aontaíonn an Custaiméir an Bord Measúnaithe a chur ar ais go pras chuig ADI. SRIANTA BREISE. Ní fhéadfaidh custaiméirí sliseanna innealtóra a dhíchóimeáil, a dhí-thiomsú nó a aisiompú ar an mBord Measúnaithe. Cuirfidh an custaiméir ADI ar an eolas faoi aon damáiste a tharla nó faoi aon mhodhnuithe nó athruithe a dhéanfaidh sé ar an mBord Meastóireachta, lena n-áirítear, ach gan a bheith teoranta do shádráil nó aon ghníomhaíocht eile a dhéanann difear d’ábhar ábhartha an Bhoird Mheasúnaithe. Caithfidh modhnuithe ar an mBord Measúnaithe cloí leis an dlí is infheidhme, lena n-áirítear ach gan a bheith teoranta don Treoir RoHS. CRÍOCHNÚ. Féadfaidh ADI an Comhaontú seo a fhoirceannadh tráth ar bith tar éis fógra scríofa a thabhairt don Chustaiméir. Aontaíonn an custaiméir filleadh ar ADI an Bord Measúnaithe ag an am sin. TEORANTA DLITEANAS. SOLÁTHAR AN BORD MEASTÓIREACHTA A DARAÍODH ANSEO “MAR ATÁ” AGUS NÍ DHÉANANN ADI BARÁNTAÍ NÓ IONADAÍOCHT D’AON CHINEÁL MAIDIR LEIS AN gCÓNAMH. DEARBHAÍONN ADI go sonrach AON uiríll, formhuiniú, ráthaíocht, barántaí nó barántaí, sainráite nó intuigthe, A BHAINEANN LEIS AN mBORD MEASTÓIREACHTA, Á nÁIRÍTEAR, ACH NACH BHFUIL TEORANTA LEIS, BARÁNTAS INTUIGTHE NA hIONTAOBHACHTA, TEIDEAL NA PÁIRTITHE, FORLÍONTACHT, FORLÍONTACHT, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORLÍONTACH, FORAOISEACHT . NÍ BHÍ ADI AGUS A CEADÚNAITHEOIRÍ Dliteanais ar AON AON DHÁMAIRTÍ TEAGMHÁLA, SPEISIALTA, NEAMHDHÍREACH NÓ IARMHARTACH A BHFUIL AN CHUSTAIMÉIRÍ A SHEOLADH NÓ ÚSÁID AN BHOIRD MEASTÓIREACHTA, Á nÁIRÍTEAR ACH NACH BHFUIL TEORANTA DO CHOSTAIS I gCAILLTEANAIS, AR SHAOBH SHAORÁID A CHUR CHUN CINN. . BEIDH DLITEANAS IOMLÁN ADI Ó GACH CÚISEANNA TEORANTA CHUIG AN MÉID CÉAD TUILLEADH AMHÁIN ($100.00). ONNMHAIRIÚ. Aontaíonn an custaiméir nach ndéanfaidh sé an Bord Meastóireachta a onnmhairiú go díreach nó go hindíreach chuig tír eile, agus go gcomhlíonfaidh sé gach dlí agus rialachán feidearálach is infheidhme de chuid na Stát Aontaithe a bhaineann le honnmhairí. DLÍ LENA RIALAÍTEAR. Beidh an Comhaontú seo faoi rialú agus arna fhorléiriú de réir dhlíthe substainteacha Chomhlathas Massachusetts (gan rialacha easaontachta dlí a áireamh). Éistfear aon chaingean dlí maidir leis an gComhaontú seo sna cúirteanna stáit nó feidearálach a bhfuil dlínse acu i gContae Suffolk, Massachusetts, agus géilleann an Custaiméir leis seo do dhlínse pearsanta agus ionad na gcúirteanna sin.

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