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# Switching Power Supply (SPS) Design Notes for (Launch Vehicle 2b) LV2b

LV2b SPS Schematic:

## ---------- Integrated Circuits (ICs) ----------

- **Step-Down Switching Voltage Regulator (Buck Topology) (U200)**

Part Description:

- Main SPS Switching Buck Regulator at +3.3V rail and Io,max ~ 400 mA. Monolithic Step-Down Buck Switching Regulator, Current Mode Control, 1.5 A, 1.25 MHz (Adjustable), 3V < Vin < 25 V, 8-MSOP (No exposed ground/thermal pad), RoHS Non-Compliant, Linear Technology, LT1767EMS8 (Digikey p/n LT1767EMS8-ND $6.00/1) [Datasheet](http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1042,C1032,C1064,P1915,D1885)

Purpose:

Specifications/ Calculations:

- **Overcurrent/Circuit-Breaker Protection (U250)**

Part Description:

- MAX5902AAETT +72 V, SOT-23, Simple Swapper How-Swap Controller. Ordered samples from vendor no Digi-Key. [Datasheet](http://pdfserv.maxim-ic.com/en/ds/MAX5902-MAX5903.pdf).

Purpose:

Specifications/ Calculations:

- **Undervoltage/Overvoltage Protection (U251)**

Part Description:

- Nanopower Push-Pull Output Comparator with Voltage Reference, 1.8 V < Vin < 5.5 V, SOT-23-6, Tape & Reel (TR), RoHS Compliant, Texas Instruments, TLV3012AIDBVT (Digikey p/n 296-16830-2-ND $262.50/250) **NOTE:** Ordered samples from vendor no Digi-Key. [Datasheet](http://focus.ti.com/lit/ds/symlink/tlv3012.pdf).

Purpose:

Specifications/ Calculations:

## ---------- Discrete Components ----------

- **Power Bus Fast-Acting Fuse (F200)**

Part Description:

- 500 mA, 50 V, 1206, Fast Acting Short Time Lag, RoHS Compliant, Wickmann USA Inc, FCD120500TP (Digikey p/n WK6213CT-ND $0.56/1)
    [Datasheet](http://rocky.digikey.com/WebLib/WICKMANN/Web%20Data/FCD12.pdf).

Purpose:

Specifications/ Calculations:

- **MAX5902 External P-MOSFET (Q250)**

Part Description:

- -60 V, -3 A, SOT-23-6, P-Channel MOSFET, Cut Tape, RoHS Compliant, Zetex Inc, ZXMP6A17E6TA (Digikey p/n ZXMP6A17E6CT-ND $1.04/1)
    [Datasheet](http://www.zetex.com/3.0/pdf/ZXMP6A17E6.pdf).

Purpose:

Specifications/ Calculations:

- **TLV3012AIDBVT External Logic-Level N-MOSFET (Q251)**

Part Description:

- 100 V, 170 mA, RDS(on) = 10 ohm @ Vgs = 4.5V, SOT-23, Cut Tape, RoHS Compliant???, N-Channel Logic-Level MOSFET, Infineon Technologies, BSS123E6327 (Digikey p/n BSS123INCT-ND $0.36/1)
    [Datasheet](http://rocky.digikey.com/WebLib/Infineon/Web%20Data/BSS123.pdf).

Purpose:

Specifications/ Calculations:

- **Power Bus Input Voltage Suppressor (TVS200)**

Part Description:

- 18 V, SMB, Unidirectional, Cut Tape, RoHS Non-Compliant, Diodes Inc, SMBJ18A-13 (Digikey p/n SMBJ18ADICT-ND $0.89/1)
    [Datasheet](http://www.diodes.com/datasheets/ds19002.pdf).

Purpose:

Specifications/ Calculations:

## ---------- Diodes ----------

- **Buck (Catch) Schottky Diode (CR200)**

Part Description:

- 30 V, 1.5 A, 4 ns, New MiniPower 2P, Cut Tape, RoHS Compliant???, Panasonic - SSG, MA2Q70500L (Digikey p/n MA2Q70500LCT-ND $0.83/1) [Datasheet](http://www.semicon.panasonic.co.jp/ds/eng/SKH00017BED.pdf).

Purpose:

Specifications/ Calculations:

- **Boost Rectifier Diode (CR201)**

Part Description:

- 180 V, 0.6 A, SOT-23, Cut Tape, RoHS Compliant, Micro Commercial Co., MMBD1501-TP (Digikey p/n MMBD1501TPMSCT-ND $2.00/10)
- [Datasheet](http://59.120.39.77/mccsemi/up_pdf/MMBD1501(A)-1505(A)(SOT-23).pdf).

Purpose:

Specifications/ Calculations:

- **TLV3012AIDBVT "Secondary Power Supply" Schottky Diode (CR250)**

Part Description:

- 30 V, 1.5 A, 4 ns, New MiniPower 2P, Cut Tape, RoHS Compliant???, Panasonic - SSG, MA2Q70500L (Digikey p/n MA2Q70500LCT-ND $0.83/1) [Datasheet](http://www.semicon.panasonic.co.jp/ds/eng/SKH00017BED.pdf).

Purpose:

Specifications/ Calculations:

- **SPS Secondary Buck (Catch) Schottky Diode (CR251)**

Part Description:

- 30 V, 1.5 A, 4 ns, New MiniPower 2P, Cut Tape, RoHS Compliant???, Panasonic - SSG, MA2Q70500L (Digikey p/n MA2Q70500LCT-ND $0.83/1) [Datasheet](http://www.semicon.panasonic.co.jp/ds/eng/SKH00017BED.pdf).

Purpose:

Specifications/ Calculations:

- **SPS Output Power On LED (D201)**

Part Description:

- 1\.9 V, 90 mcd @ 20 mA, 609 nm, 0805, Orange Diffused LED, CML Innovative Technologies Inc, CMDA5BA7D1S (Digikey p/n L71515CT-ND $3.00/10)
    [Datasheet](http://www.chml.com/pdf/fiche_pdf.php?product_id=7700).

Purpose:

Specifications/ Calculations:

## ---------- Resistors ----------

- **LT1767 FB Resistor Network: (R200, R201)**
- R200:

Part Description:

- 10\.0 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF1002 (Digikey p/n RHM10.0KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- R201:

Part Description:

- 17\.4 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF1742 (Digikey p/n RHM17.4KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- **LT1767EMS8 Frequency Compensation Resistor (R206)**

Part Description:

- TBD

Purpose:

Specifications/ Calculations:

- **LT1767EMS8 UVLO Lockout Resistor Network: (R209, R210)**
- R209

Part Description:

- 60\.4 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF6042 (Digikey p/n RHM60.4KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- R210

Part Description:

- 10\.0 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF1002 (Digikey p/n RHM10.0KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- **SPS Output Power On LED Current Limiter Resistor (R214)**

Part Description:

- 649 ohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant, Rohm, MCR10EZHF6490 (Digikey p/n RHM649CCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- **DC Path From SPS Node GND to Chassis GND Resistor (R215)**'

Part Description:

- 100 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant, Rohm, MCR10EZHF1003 (Digikey p/n RHM100KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- **MAX5902 Circuit-Breaker Resistor Network (R250, R251)**
- R250

Part Description:

- 61\.9 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF6192 (Digikey p/n RHM61.9KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- R251

Part Description:

- 10\.0 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF1002 (Digikey p/n RHM10.0KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- **MAX5902AAETT Circuit-Breaker External P-MOSFET RDS(on) Additional Series Resistor (R252)**

Part Description:

- 0\.82 ohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Panasonic - ECG, ERJ-6RQFR82V (Digikey p/n P.82DCT-ND $2.10/10)
    [Datasheet](http://www.panasonic.com/industrial/components/pdf/AOA0000CE3.pdf). **Note:** This value may change due to board level testing results.

Purpose:

Specifications/ Calculations:

- **TLV3012AIDBVT Overvoltage Detection External N-MOSFET Current Limiting Resitor (R253)**

Part Description:

- 47\.0 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF4702 (Digikey p/n RHM47.0KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- **TLV3012AIDBVT UVLO Lockout Resistor Network (R254, R255)**
- R254

Part Description:

- 18\.2 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF1822 (Digikey p/n RHM18.2KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

- R255

Part Description:

- 10\.0 kohm, 0805, 1%, 1/8 W, Cut Tape, RoHS Compliant???, Rohm, MCR10EZHF1002 (Digikey p/n RHM10.0KCCT-ND $0.38/10)
    [Datasheet](http://www.rohm.com/products/databook/r/pdf/mcr10.pdf).

Purpose:

Specifications/ Calculations:

## ---------- Inductors ----------

- **Split Buck Inductor (L200a, L200b)**

Part Description:

- SD3118-470-R Low Profile Power Inductor 47 uH, Shielded Drum Package (Bobbin), RoHS Compliant???, Tape and Reel
    The [SD3118-470-R](http://www.cooperet.com/library/products/PM-4129%20SD3118%20Series.pdf) datasheet from Coiltronics.

Purpose:

Specifications/ Calculations:

- **Power Bus Input Choke (L201, L202)**

Part Description:

- CMS1-11-R Common Mode Inductors 100 uH, Micro-PAC Plus Package, RoHS Compliant, Tape and Reel.
    The [CMS1-11-R](http://www.cooperet.com/library/products/PM-4313%20CMS-Series.pdf) datasheet from Coiltronics.

Purpose:

Specifications/ Calculations:

## ----------Capacitors----------

- **Buck Output Cap (C200)**

Part Description:

- 22 uF, 6.3 V, 0805, X5R, Cut Tape, RoHS Compliant, Panasonic - ECG , ECJ-2FB0J226M (Digikey p/n PCC2401CT-ND $8.31/10)
    [Datasheet](http://dkc3.digikey.com/PDF/T062/1235.pdf).

Purpose:

Specifications/ Calculations:

- **Buck Input Cap (C201)**

Part Description:

- 10 uF, 25 V, 1206, X5R, Cut Tape, RoHS Compliant, Panasonic-ECG, ECJ-3YB1E106K (Digikey p/n PCC2414CT-ND $5.45/10)
    [Datasheet](http://www.panasonic.com/industrial/components/pdf/abj0000ce4.pdf).

Purpose:

Specifications/ Calculations:

- **Boost Cap (C202)**

Part Description:

- 0\.1 uF, 50 V, 0805, X7R, Cut Tape, RoHS Compliant, Panasonic-ECG, ECJ-2YB1H104K (Digikey p/n PCC1840CT-ND $1.61/10)
    [Datasheet](http://industrial.panasonic.com/www-data/pdf/ABJ0000/ABJ0000CE1.pdf).

Purpose:

Specifications/ Calculations:

- **Power Bus Input Caps (C203, C204)**
- C203 Part Description:
    22 uF, 25 V, Tant, T491 Series, 7343-31 (EIA), Cut Tape, RoHS Compliant???, Kemet, T491D226K025AT (Digikey p/n 399-3782-1-ND $0.65/1) [Datasheet](http://www.kemet.com/kemet/web/homepage/kechome.nsf/vapubfiles/F3102T491.pdf/$file/F3102T491.pdf).

Purpose:

Specifications/ Calculations:

- C204 Part Description: 0.33 uF, 50 V, 0805, X7R, Cut Tape, RoHS Compliant, Murata Electronics North America , GRM219R71H334KA88D (Digikey p/n 490-3327-1-ND $3.09/10)
    [Datasheet](http://search.murata.co.jp/Ceramy/image/img/PDF/ENG/GRM219R71H334KA88.pdf).

Purpose:

Specifications/ Calculations:

- **LT1767 Frequency Compensation Caps (C205, C206)**
- C205

Part Description:

- TBD

Purpose:

Specifications/ Calculations:

- C206

Part Description:

- TBD

Purpose:

Specifications/ Calculations:

- **LT1767 FB Resistor Network Shunt Caps (C208, C209)**
- C208:

Part Description:

- TBD

Purpose:

Specifications/ Calculations:

- C209:

Part Description:

- 10 pF, 50 V, 0805, NPO, Cut Tape, RoHS Compliant???, BC Components, VJ0805A100JXACW1BC (Digikey p/n BC1256CT-ND $0.52/10)
    [Datasheet](http://www.cooperet.com/library/products/PM-4313%20CMS-Series.pdf).

Purpose:

Specifications/ Calculations:

- **LT1767 UVLO Resistor Network Shunt Cap (C210)**

Part Description:

- 0\.1 uF, 50 V, 0805, X7R, Cut Tape, RoHS Compliant???, BC Components , VJ0805Y104KXATW1BC (Digikey p/n BC1298CT-ND $0.72/10)
    [Datasheet](http://rocky.digikey.com/WebLib/BC%20Components/Web%20Data/MLCC,%20SMT%20NPO%20(10,16,25%20%26%2050V).pdf).

Purpose:

Specifications/ Calculations:

- **TLV3012AIDBVT "Secondary Power Supply" Cap (C250)**

Part Description:

- 2\.7 uF, 10 V, 0805, X5R, Cut Tape, RoHS Compliant, Kemet, C0805C275K8PACTU (Digikey p/n 399-3127-1-ND $7.02/10)
    [datasheet](http://www.kemet.com/kemet/web/homepage/kechome.nsf/vapubfiles/F3102X5R.pdf/$file/F3102X5R.pdf).

Purpose:

Specifications/ Calculations:

- **TLV3012AIDBVT Overvoltage Detection Cap (C251)**

Part Description:

- 0\.015 uF, 100 V, 0805, X7R, Cut Tape, RoHS Compliant, AVX Corporation, 08051C153KAT2A (Digikey p/n 478-1359-1-ND $2.64/10)
    The [Datasheet](http://rocky.digikey.com/WebLib/AVX/Web%20Data/X7R%20(C).pdf).

Purpose:

Specifications/ Calculations:

- **SPS Secondary Buck Output Cap (C252)**

Part Description:

- TBD
    **Note:** This is an application specific cap whose value is mostly independent from the SPS design.

Purpose:

Specifications/ Calculations:

----
Attachments:

- [[SPS_Design_Schematic_rev2_2.pdf]]