SC900 SEMTECH | Alldatasheet
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Features
Typical Application Circuit The SC900 is a highly integrated power management device for low power portable applications. The device contains five adjustable low-dropout linear regulators (LDOs) with CMOS pass-devices as well as a band-gap reference, I 2C interface, and DACs to control the output voltages. Many features of the SC900 are programmable through the I 2C interface. These include the ability to indepen- dently turn on any combination of the five regulators. All five of the LDO output voltages are programmable in 50mV steps from 1.45V to 3.00V. Each LDO can have an active shutdown or nonactive shutdown program op- tion through the interface. There is also a reset monitor flag that is associated with LDOA. In addition, the device has a separate programmable power-good monitor flag that activates when one or more LDOs go out of regula- tion. The SC900 offers significant quiescent current and space savings to the system designer by sharing reference and biasing among five LDOs. The small and thermally effi- cient 20-lead MLPQ package make it ideal for use in por- table products where minimizing layout area is critical. ! Five LDO regulators in one package ! I2C interface with multiple device capability ! Independent I2C enable/disable of LDOs ! Independent I 2C control of output voltages ! Low thermal impedance of 40°C per watt ! 150mV dropout at 150mA ! Input range from 2.7V to 5.5V ! Programmable power-good flag ! Minimal number of external components ! Over temperature protection ! Small 4mm x 4mm 20-lead MLPQ package ! Small input/output filter capacitors ! Programmable VOUT range - 1.45V to 3.00V for each LDO ! Palmtop/Laptop computers ! Personal Digital Assistants ! Cellular telephones ! Battery-powered equipment ! High efficiency linear power supplies VIN INA INB INCD INE EN LDOPGD ARST SDA SCL GND LDOA LDOB LDOC LDOD LDOE VREF VASEL DGND SC900 4.7µF VBAT Baseband Processor Receiver Section Transmitter Section TXCO Synthesizer Audio Processing LNA PA 2.2µF 0.1µF Digital Interface Keypad 2.2µF 2.2µF 2.2µF 2.2µF
2 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Absolute Maximum Ratings
Electrical Characteristics
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of th e parameters specified in the Electrical Characteristics section is not implied. retemaraPl obmySm umixaMs tinU egatloVylppuStupnIV NI 7+ot3.0-V egatloVtupnIlatigiDV GID Vot3.0- NI 3.0+V egnaRerutarepmeTtneibmAgnitarepOT A 58+ot04-C ° egnaRerutarepmeTnoitcnuJgnitarepOT J 521+ot04-C ° erutarepmeTwolfeRRIkaePT DAEL 062C ° erutarepmeTegarotST GTS 051+ot06-C ° tneibmAotnoitcnuJecnatsiseRlamrehT θ AJ *04W /C° *1 Square inch, 2 ounce copper. Unless otherwise noted: VIN = 3.7V, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. retemaraPl obmySn oitidnoCn iMp yTx aMs tinU lareneG egatloVylppuSV NI V<stuptuollA NI tuopord-7 .25 .5V nwodtuhStnerruCtnecseiuQI NWODTUHS-Q 01A µ roticapaCssapyBylppuSC CCV niptupnireP1 F µ stupnIlatigiD egatloVtupnIlatigiDV LI 4.0V VHI 6.1V tnerruCtupnIlatigiDI GID 2.0-2 .0A µ stuptuOlatigiD egatloVtuptuOlatigiD )1( V LO I KNIS V,Am2.1= BODL ≥ V8.12 0 1% BODL V HO I ECRUOS V,Am5.0= BODL ≥ V8.10 98 9% BODL yrtiucriCgnisaiBdnaecnerefeR ecnerefeRtnerruCtnecseiuQI FER-Q 52A µ egatloVecnerefeRV FER 722.1V V FER emiTpu-tratSt FERV C FERV Fn001=5 1s m
3 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Electrical Characteristics (Cont.) Unless otherwise noted: VIN = 3.7V, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. sretemaraPl obmySs noitidnoCn iMp yTx aMs tinU ).tnoc(yrtiucriCgnisaiBdnaecnerefeR roticapaCssapyBFERVF ERVC1 .0F µ srotalugeRODL tnerruCylppuStnecseiuQI Q setatstluafednievitcasODLllA0 910 63A µ tnerruCylppuStnecseiuQ pu-tratSta I PUSQ setatstluafednievitcaC,B,AODL V TUO V5.0+< V NI <V 5.5 521A µ egatloVtuoporD E,D,C,BODL AODL VD V TUO I,V0.3= TUO Am1= V TUO I,V0.3= TUO Am05= V TUO I,V0.3= TUO Am051= 1.1 051 091V m V TUO I,V0.3= TUO Am002=0 020 52 timiLtnerruCI MIL 0520 140 56A m oitaRnoitcejeRylppuSrewoPR RSP C,zHk1-zH01=f PYB ,Fµ1.0= I TUO Am05= V5.2< V TUO <V 0.3 06B d esioNegatloVtuptuO )2( en I,zHk001otzH01=f TUO Am05= C FERV C,Fµ1.0= TUO Fµ2.2= V5.2 ≤ V TUO ≤ V0.3 54s mrVµ roticapaCssapyBC PYB RSEwol,cimareC2 .2F µ )YLPPUSEROC(ArotalugeRODL ycaruccAegatloVtuptuOA OV A V54.1 ≤ V TUO ≤ V00.3 V TUO V2.0+ ≤ VNI ≤ V5.5 I TUO T,Am1= A 52= OC 3-3 +% taycaruccAegatloVtuptuO )11011=CAD(V08.2 SAOV A I TUO Am1= 2-2 +% taycaruccAegatloVtuptuO )11100=CAD(V08.1 I TUO T,Am1= A 52= OC 3-3 +% taycaruccAegatloVtuptuO )11011=CAD(V08.2 I TUO V,Am002= TUO V5.0+ ≤ VNI ≤ V5.5 5.3-5 .3+% tnerruCtuptuOmumixaMX AMOI A 002A m NO:gnitteStluafeDO V IH-A hgiHLESAV0 8.2V OV OL-A woLLESAV0 8.1V V8.2,V8.1tanoitalugeRdaoLG ERDAOL A I<Am1 TUO Am002<3 -0 2-V m
4 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Electrical Characteristics (Cont.) Unless otherwise noted: VIN = 3.7V, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. retemaraPl obmySn oitidnoCn iMp yTx aMs tinU )YLPPUSO/ILATIGID(BrotalugeRODL ycaruccAegatloVtuptuOA OV B V54.1 ≤ V TUO ≤ V00.3 V TUO V51.0+ ≤ VNI ≤ V5.5 I TUO T,Am1= A 52= OC 3-3 +% taycaruccAegatloVtuptuO )11011=CAD(V08.2 SAOV B I TUO Am1=2 -2 +% I TUO V,Am051= TUO V5.0+ ≤ VNI ≤ V5.55 .3-5 .3+% tnerruCtuptuOmumixaMX AMOI B 051A m NO:gnitteStluafeDO V B 08.2V V08.2noitalugeReniLG ERENIL B I TUO V,Am1= TUO V51.0+ ≤ VNI ≤ V5.55 .22 1V m V08.2tanoitalugeRdaoLG ERDAOL B I<Am1 TUO Am051<3 -0 2-V m CrotalugeRODL ycaruccAegatloVtuptuOA OV C V54.1 ≤ V TUO ≤ V00.3 V TUO V51.0+ ≤ VNI ≤ V5.5 I TUO T,Am1= A 52= OC 3-3 +% taycaruccAegatloVtuptuO )11101=CAD(V06.2 SAOV C I TUO Am1=2 -2 +% I TUO V,Am051= TUO V5.0+ ≤ VNI ≤ V5.55 .3-5 .3+% tnerruCtuptuOmumixaMX AMOI C 051 Am NO:gnitteStluafeDO V C 06.2 V V06.2tanoitalugeReniLG ERENIL C I TUO V,Am1= TUO V<V51.0+ NI V5.5< 5.22 1 Vm V06.2tanoitalugeRdaoL GERDAOL C I<Am1 TUO Am051< 3-0 2- Vm DrotalugeRODL ycaruccAegatloVtuptuOA OV D V54.1 ≤ V TUO ≤ V00.3 V TUO V51.0+ ≤ VNI ≤ V5.5 I TUO T,Am1= A 52= OC 3-3 +% ycaruccAegatloVtuptuO )11011=CAD(V08.2ta SAOV D I TUO Am1=2 -2 +% I TUO V,Am051= TUO V5.0+ ≤ VNI ≤ V5.55 .3-5 .3+% tnerruCtuptuOmumixaMX AMOI D 051 Am FFO:gnitteStluafeDO V D 08.2V V08.2tanoitalugeReniLG ERENIL D I TUO V,Am1= TUO V<V51.0+ NI V5.5<5 .22 1V m V08.2tanoitalugeRdaoL GERDAOL D I<Am1 TUO Am051< 3-0 2- Vm
5 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Electrical Characteristics (Cont.) Unless otherwise noted: VIN = 3.7V, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. retemaraPl obmySn oitidnoCn iMp yTx aMs tinU ErotalugeRODL ycaruccAegatloVtuptuO AOV E V54.1< V TUO <V 00.3 V TUO V<V51.0+ NI V5.5< I TUO ,Am1=T A 52= OC 3-3 +% V08.2taycaruccAegatloVtuptuO )11011=CAD( SAOV E I TUO Am1=2 -2 +% I TUO V,Am051= TUO V<V5.0+ NI V5.5<5 .3-5 .3+% tnerruCtuptuOmumixaMX AMOI E 051A m FFO:gnitteStluafeDO V E 08.2V V08.2tanoitalugeReniLG ERENIL E I TUO V,Am1= TUO V<V51.0+ NI V5.5<5 .22 1V m V08.2tanoitalugeRdaoLG ERDAOL E I<Am1 TUO Am051<3 -0 2-V m I2 ecafretnIC IedomevalshtiwseilpmocecafretnI 2 IspilihPybdebircsedsaecafretniC 2 yraunaJdetad1.2noisrevnoitacificepsC .0002 egatloVtupnIlatigiD VLI 4.0V VHI 6.1V leveLwoLtuptuOADS I NID Am3=)ADS(4 .0V I NID Am6=)ADS(6 .0V tnerruCtupnIlatigiDI GD 2.0-2 .0A µ ecnaticapaCniPO/IC NI 01F p I2 gnimiTC ycneuqerFkcolCL CS0 04z Hk doirePwoLLCSt WOL 3.1s µ doirePhgiHLCSt HGIH 6.0s µ emiTdloHataDt TAD_DH 0s µ emiTputeSataD t TAD_US 001s n detaepeRrofemiTputeS noitidnoCtratS t ATS_US 6.0s µ detaepeRrofemiTdloH noitidnoCtratS t ATS_DH 6.0s µ noitidnoCpotSrofemiTputeSt OTS_US 6.0s µ neewteBemiTeerF-suB TRATSdnaPOTS t FUB 3.1s µ
6 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Electrical Characteristics (Cont.) Unless otherwise noted: VIN = 3.7V, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. retemaraPl obmySn oitidnoCn iMp yTx aMs tinU TESERA dlohserhTteseR TESER DLHT 77% yaleDtuoemiTevitcAteseR t DR etatstluafedniyaleD 570 015 21s m DOOGREWOPODL dlohserhTDOOGP DOOGP DLHT 77% yaleDtuoemiTevitcADOOGP t GP etatstluafedniyaleD 570 015 21s m Notes: (1) Digital outputs are powered from LDOB, so LDOB must be active for operation of LDOPGD and ARST. (2) Below 2.5V: becomes digital regulator.
7 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Pin Configuration Ordering Information ECIVEDE GAKCAP )1( TRTLMI009CS )2( L02QPLM BVE009CSd raoBnoitaulavE Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Available in Lead-free package only. This product is fully WEEE and RoHS compliant. TOP VIEW 4 12 109 678 MLPQ20: 4X4 20 LEAD 17181920 T LDOB INB SDA SCL EN LDOE INE VIN GND VREF DGND VASEL LDOPGD ARST LDOA INA LDOC INCD LDOD
8 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 #niP niP emaN noitcnuFniP 1B ODL. tuptuoBODL 2B NI .rotsisnartssapBODLehtdnacigolmetsyslatigidehtrofylppustupnI 3A DSI .nipO/IlatigidniardnepolanoitceridiB 2 .atadlairesC 4L CSI .tupnilatigiD 2 .kcolclairesC 5 NE IetoN.)edompeels(trapelbasidotwoL.trapelbaneothgiH.tupnilatigiD 2 ylnoevitcasilortnocC .delbanesitrapnehw 60 A Iehthguorhtmetsysehtotnosecived009CSowtgnitcennocrofsserddatibenO 2 .ecafretniC 7D NGD. dnuorglatigiD 8L ESAV .V8.2rofBNIroV8.1rofdnuorgotnipsihteiT.egatlovtluafednoitcelesAODL 9 DGPODL fotuosi)EroD,C,A(segatlovtuptuoODLruoffoenotahtsetacidniegnahcetatS.tuptuolatigiD Iehthguorhtelbammargorpsinipfoetatsderised,etoN.ceps 2 .ecafretniC 01 TSRA foetatsderised;etoN.cepsfotuosiegatlovtuptuoAODLsetacidniegnahcetatS.tuptuolatigiD Iehthguorhtelbammargorpsinip 2 .ecafretniC 11F ERV VC(dnuorgotFµ1.0tsaeltatcennoC.egatlovtuptuoecnereferpagdnaB FER ≥ .)Fµ1.0 21D NG. dnuorggolanA 31N IV. egatlovylppusgolanA 41E NI. rotsisnartssapEODLehtrofylppustupnI 51E ODL. tuptuoEODL 61D ODL. tuptuoDODL 71D CNI. srotsisnartssapDODLdnaCODLehtrofylppustupnI 81C ODL. tuptuoCODL 91A NI. rotsisnartssapAODLehtrofylppustupnI 02A ODL. tuptuoAODL Tl amrehT detcennoctoN.saivelpitlumgnisuenalpdnuorgottcennoC.sesoprupgniknistaehrofdaP .yllanretni Pin Description
9 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 DACs CTRL Input DAC A DAC B DAC C DAC D DAC E Reference en I2C Interface en vasel scl sda DAC CTRL LDO CTRL reset CTRL Reset/ Shutdown CTRL reset arst ldopgd LDO enref dac input out LDO enref dac input out LDO enref dac input out LDO enref dac input out LDO enref dac input out VOB EN VASEL SCL SDA VIN INB VOB ARST LDOPGD INA INB INCD INE GNDDGND INB VREF LDOA LDOB LDOC LDOD LDOE Block Diagram
10 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Applications Information General Description Each of the five low-dropout linear regulators (LDOs) can be independently enabled or disabled and their output voltages can each be set by an independent DAC. These controls can be accessed through the I 2C serial port. There are five 8-bit volatile registers in the SC900; one for each LDO (registers A,B,C,D,E). In addition there is one common reset and power good control register and one on/off control register. The active shutdown circuitry can be accessed through each LDO register (refer to the section Active Shutdown on page 11 for more informa- tion). At power-up, the register contents are reset to their de- fault values and the ARST for LDO A has a default start- up delay of 100ms. At any time the part can be put into its lowest power state (shutdown) by pulling the EN pin low. Whenever the EN pin is forced low, the previous settings are lost and the part requires reprogramming to return to the desired state. When EN is pulled high, the device starts up in the default state. A detailed descrip- tion of the protocol used to load the registers with data is described in the section entitled Using the I 2C Inter- face on page 13. VIN and Enable Pin The VIN supply must be ≥ 2.7V before the EN pin can be asserted. This means that the EN pin should not be tied to VIN so that it does not reach a logic high level before the input supply reaches 2.7V. LDOA (Core Supply) LDOA is intended to be used as the MSM core supply. It has an output current capability of 200mA and a dedi- cated reset signal ARST. INA is the dedicated input sup- ply for this regulator. LDOB (Digital I/O Supply) INB supplies power for the internal I 2C interface and other digital I/O functions, while LDOB supplies power for ARST and LDOPGD output ports (see block diagram). There- fore it is imperative that LDOB be operational to make use of ARST and LDOPGD. If LDOB is turned off by the on/off control register, these output ports will not func- tion. LDO RESET Control Register: ARST Pin There are two functions that can be programmed, defin- ing the ARST pin action: Set the polarity of the reset signal Set the reset clear delay time in milliseconds As soon as the LDOA output voltage falls below its pro- grammed value, the ARST pin is asserted. The polarity of the ARST pin can be set to active high or active low during a reset condition, by bit 6 of the LDO Reset Con- trol Register. Once the error condition is resolved (out- put rises to the programmed value), a delay is initiated before the ARST pin is cleared. The delay is program- mable by bits 0-1 of the LDO Reset Control Register. The Default delay time is 100ms, and the delay can be pro- grammed for 0, 50, 100, or 150ms. LDOPGD Pin There are three functions that can be programmed to define the LDOPGD pin action: Set which LDOs are to be monitored for power-good Set the polarity of the power-good signal Set the power-good delay time in milliseconds Bits 4 and 5 of the LDO Reset Control Register select which LDO or LDOs are monitored. LDO C, D and E can be monitored independently or LDOs A, C, D, & E can be monitored collectively. The polarity of the LDOPGD pin can be set to active high or active low by bit 7 of the LDO Reset Control Register. As soon as any of the selected LDO output voltages which are monitored falls within spec, the LDO power-good (LDOPGD) pin is asserted. Once the LDO output power is stable (output rises to the pro- grammed value), a delay is initiated before the LDOPGD pin is set. The delay is programmable by bits 2 and 3 of the LDO Reset Control Register. The default delay is 100ms, and this delay can be programmed to 0, 50, 100, or 150ms.
12 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 retsigeR emaN retsigeR sserddA 7tiB6 tiB5 tiB4 tiB3 tiB2 tiB1 tiB0 tiB AODL0 0x0XX e vitcA nwodtuhS NO=1 FFO=0 sedoCegatloVtuptuOODL AelbaT BODL1 0x0 CODL2 0x0 DODL3 0x0 EODL4 0x0 teseRODL lortnoC 50x0n iPDGPODL tiBytiraloPteseR niPTSRA tiBytiraloPteseR stiBcigoLrotinoMDGPODLs tiByaleDDGPODLs tiByaleDteseR)A(ODL lortnoCffO/nO retsigeR 60x0XX X l ortnoCFFO/NO EODL lortnoCFFO/NO DODL lortnoCFFO/NO CODL lortnoCFFO/NO BODL lortnoCFFO/NO AODL 1 0 1010 10 10 NO FFO NO FFON O FFO NO FFO NO FFO 7tiBt luseR6 tiBt luseR5 tiB4 tiBt luseR3 tiB2 tiBt luseR1 tiB0 tiBt luseR ytiraloPniPDGPODLy tiraloPniPTSRAc igoLrotinoMDGPODLy aleDDGPODLy aleDTSRA 0l iaFrewoP:hgiH dooGrewoP:woL 0t eseR:hgiH dooGrewoP:woL 00 sODL E&D,C,A dooG 00 s m0510 0s m051 1 dooGrewoP:hgiH liaFrewoP:woL 1 dooGrewoP:hgiH teseR:woL 01 d ooGEODL0 1 sm001 01 s m05 10 d ooGCODL1 0 s m05 10 s m001 11 d ooGDODL1 1 s m01 1 s m0 SC900 Slave Address: REIFITNEDIEPYTECIVEDE CIVED SSERDDA W/R 000100 0 A X Applications Information (Cont.) LDO Reset Control Logic Table (Defaults are in Bold) LDO Reset Control Logic Table (Defaults are in Bold) Layout Considerations Layout is straightforward if you use the Gerber files on page 21 as a reference. Notice that the input voltage feed to the SC900 is on the bottom of the board and vias connect this voltage track to the top of the board and then to the SC900 itself. The input bypass can be one 4.7µF capacitor, two 3.3µF capacitors, three 2.2µF capacitors or five 1µF capacitors. The determining fac- tor is how much copper is available on the input voltage feed track and how much room is available. If the input Notes: Digital outputs are powered from INB, additionally LDOB must be on for operation of LDOPGD and ARST. voltage track is very thin, then use five 1µF capacitors placed very close to the input pins of the SC900. If the input track is fairly thick, then you can use a single 4.7µF capacitor at the beginning of the voltage feed track since a wider track has less inductance per inch. The SC900EVB has five 1µF capacitors, but these can be replaced with one 4.7µF in place of C1 and opens in place of C9, C14, C15, and C16 (see page 20 for de- tails).
13 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Applications Information (Cont.) Output Voltage Code Bits: A 5-bit linear DAC controls the output voltage of each LDO. The DAC and error-amp gain are scaled so that the LSB size at the output is 50mV. Output voltage can be set by writing the proper code to the desired LDO register. See Table A for the bitcodes and their corresponding voltages. Table A - LDO Output Voltage Control Settings 4tiB3 tiB2 tiB1 tiB0 tiBe gatloVtuptuOODL 00000 V 54.1 00001 V 05.1 00010 V 55.1 00011 V 06.1 00100 V 56.1 ----- - ----- - 11110 V 59.2 11111 V 00.3 Using the I 2C Interface The SC900 is a read-write slave-mode I 2C device and complies with the Philips I 2C standard Version 2.1 dated January 2000. The SC900 has six user-accessible internal 8-bit registers. The I 2C interface has been designed for program flexibility, in that once the slave address has been sent to the SC900 enabling it to be a slave transmitter/ receiver, any register can be written or read from independent of each other. While there is no auto increment/ decrement capability in the SC900 I 2C logic, a tight software loop can be designed to randomly access the next register independent of which register you begin accessing. The start and stop commands frame the data-packet and the repeat start condition is allowed if necessary. SC900 Limitations to the I 2C Specifications Seven-bit addressing is required for communicating with the SC900; ten-bit addressing is not allowed. Any general call address will be ignored by the SC900. Note that the SC900 is not CBUS compatible. Finally, the SC900 can operate in standard mode (100kbit/s) or fast mode (400kbit/s).
14 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Applications Information (Cont.) Supported Formats Direct Format - Write The simplest format for an I 2C write is the direct format. After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC900 I 2C then acknowledges that it is being addressed, and the master responds with an 8-bit data byte consisting of the register address. The slave acknowledges and the master sends the appropriate 8-bit data byte. Once again the slave acknowledges and the master terminates the transfer with the stop condition [P]. Combined Format - Read After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC900 I then acknowledges that it is being addressed, and the master responds with an 8-bit data byte consisting of the register address. The slave acknowledges and the master sends the repeated start condition [Sr]. Once again the slave address is sent, followed by an eighth bit indicating a read. The slave responds with an acknowledge and the previously addressed 8-bit data byte. The master then sends a non-acknowledge (NACK). Finally, the master terminates the transfer with the stop condition [P]. I2C Direct Format - Write Register AddressS S : Start Condition W: Write = '0' A : Acknowledge (sent by slave) Sr: Repeated Start Condition P : Stop Condition Slave Address : 7 bit Register Address : 8 bit Data : 8 Bit W A A A PSlave Address Data I2C Combined Format - Read S : Start Condition W: Write = '0' R : Read = '1' A : Acknowledge (Sent by Slave) B : Acknowledge (Sent by Master) Sr: Repeated Start Condition P : Stop Condition Slave Address : 7 bit Register Address : 8 bit Data : 8 Bit Slave Address Register AddressS W A A Sr DataSlave Address R A B P
15 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Applications Information (Cont.) Stop Separated Reads Another read format is available which is, in effect, an extension of the combined format read. This format allows a master to set up the register address pointer for a read and return to that slave some time later to read the data. After the start condition [S], the slave address is sent, followed by a write. The SC900 I 2C then acknowledges that it is being addressed, and the master responds with the 8-bit register address. The master then sends a stop or restart condition, and may address another slave. Some time later the master sends a start or restart condition, and a valid slave address is sent, followed by a read. The SC900 I 2C then acknowledges and returns the data at the register address location that had previously been set up. Slave Address I2C Stop Separated Format - Read Register AddressS S : Start Condition W: Write = '0' R : Read = '1' A : Acknowledge (sent by slave) B : Acknowledge (sent by master) Sr: Repeated Start Condition P : Stop Condition Slave Address : 7 bit Register Address : 8 bit Data : 8 Bit AW A A S Slave Address BP Slave Address DataS/ Sr AR A B P Register Address Setup Access Register Read AccessMaster Addresses other Slaves I2C Stop
16 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Timing Diagrams VTH(A) VTH(A) 90% VARST 10% VARST TRD VOUTA VARST LDO A: VTH VTH 90% VLDOPGD 10% VLDOPGD TPGD VOUT VLDOPGD LDO A, C, D, & E: ARST & LDOPGD Timing SCL SDA VLDOn 300us40us STOP STOPSTART LDO On/Off Control via the I2C Interface
17 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Timing Diagram Default Start-Up, Shut-Down Timing Diagram Enable VREF LDO A LDO B LDO C LDO D LDO E ARST LDOPGD 15ms 200us 100ms100ms15ms
18 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Typical Characteristics Dropout Voltage (LDOA) 100 120 140 160 180 0 25 50 75 100 125 150 175 200 Load Current (mA) Dropout Voltage (V) TA = 25°C TA = -40°C TA = 85°C Dropout Voltage (LDOB-E) 100 120 140 160 180 0 2 55 07 5 1 0 0 1 2 5 1 5 0 Load Current (mA) Dropout Voltage (V) TA = 25°C TA = -40°C TA = 85°C Line Regulation (LDOA-E) VIN(MIN) < VIN < 5.5V Output Voltage (V) Output Voltage Variation (mV) Load Regulation (LDOA-E) TA = 25°C, VIN = 3.7V -4.5 -3.5 -2.5 -1.5 -0.5 0 2 55 07 5 1 0 0 1 2 5 1 5 0 Load Current (mA) Output Voltage Variation (mV) Output Noise vs. Load Current (LDOA-E) 0 25 50 75 100 125 150 175 200 Load Current (mA) Output Noise (µV) VOUT = 2.5V VOUT = 3.0V
19 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Typical Characteristics Load Transient (LDOA-E) VIN = 3.7V, Io = 10mA to 150mA step Vo 20mV/div Io 100mA/div 1ms/div Line Transient VIN = 3.7V, Io = 100mA VIN 500mV/div Vo 10mV/div 100µs/div
20 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 SC900 PWR 150 ENABLE C2DAT ARST C16 1uF J10 PROGRAM & DEBUG C13 1uF EXTERNAL SUPPLY C8051F320 P0.1 P0.0 GND VDD VREGIN VBUS P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 P3.0/C2D C2CK/RST INCD TP7 LDOPGD 100K INA 2.2uF LDOD C11 0.1uF R16 150 SC900 PWR C14 1uF C12 4.7uF 7.5K TP8 ARST TP1 AM1 1uF R12 150 SW1 SC900 Power Select TP9 ENABLE +5V USB SC900 PWR GND 2.2uF INE PROBE A 7.5K INCD R15 100K EX TERNAL USB LDOA R17 2.2uF SC900 PWR PROBE E 2.2uF FMMT3904 PROBE C C15 1uF TP6 VASEL R11 100K PROBE B R14 100K 100K BOARD APPLICATION I.D. SC900 PWR LDOPGD LDOE VIN 2.2uF 4.75k +5V EXTRNAL INB INB TP2 AM2 NC7S04 150 1uF C2CLK 0.1uF INA 10uF VIN R10 150 SC900 PWR TP3 SCLK TP4 SDAT +5V USB USB BUS GND SC900 PWR J11 USB FMMT3904 INE R18 100K (No-Pop)TP5 R13 150 PROBE D 4.75k LDOB VASEL 1 2 C10 0.1uF SC900 INA SDA SCL EN LDOPGD ARST VREF GND INE LDOB INB LDOA LDOD LDOC INCD LDOE VIN VASEL DGND SC900 PWR LDOC Evaluation Board
21 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 Top Gerber Top Silk Screen Gerber Bottom Gerber Bottom Silk Screen Gerber Evaluation Board Gerbers
22 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 .001 MAX .002 .040 NOM 0.80 0.02 (0.20) 0.90 CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. NOTES: N PIN 1 INDICATOR 4.103.90 4.00 4.103.90.157 .153 .161 .153 .161 aaa C A C (LASER MARK) D E B A SEATING PLANE LxN E/2 bxN bbb C A B e D/2 INCHES .020 BSC b .007 bbb aaa N E L e D .011 .100 DIM A MIN .000 .031 0.50 2.80 0.30 2.55 .004 .004 .016 .157 .106 .020 .110 0.10 0.10 0.40 4.00 2.70
0.50 BSC
0.05 1.00 DIMENSIONS MIN 0.00 NOM (.008) .035 Outline Drawing - MLPQ-20L 4 x 4 Marking Information SC900 yyww xxxxx xxxxx yy = two digit year of manufacture ww = two digit week of manufacture xxxxx = lot number
23 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC900 DIMENSIONS K H G Z X P (C) COMPANY'S MANUFACTURING GUIDELINES ARE MET. 4.80.189ZY THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR NOTES: DIM X Y H K P C G MILLIMETERSINCHES (3.95) .010 .033 .122 .021 .106 .106 (.155) 0.25 0.85 2.70 0.50 2.70 3.10 Semtech Corporation Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 FAX (805)498-3804 Visit us at: www.semtech.com Contact Information Land Pattern - MLPQ-20L 4 x 4