SLVA340A Datasheet, PDF (5/9 Pages) Texas Instruments – High-Integration, High-Efficiency Power Solution Using DC/DC Converters With DVFS

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List of Material
Proper sequencing is ensured in the design with the use of simple circuits involving the use of NPN
transistors as required. Core 1.2 V at 600 mA comes first ,which in turn is level-shifted to input voltage
using NPN transistors to enable the DCDC3_EN ; hence, static 1.2 V + VRTC at 251 mA comes up which
also enable the DCDC2_EN and sequentially static 1.8 V at 230 mA comes up. This 1.8-V output from
DCDC2 converter enable the LDO and hence at last static 3.3 V at 115 mA comes up.
(1) Use three such LDOs to power up DVDDA, DVDDB, and DVDDC. (It can either be 1.8 V or 3.3 V.)
(2) Rx = 0.499 MΩ, Ry = 1 MΩ for Vout = 1.8 V
(3) Rx = 1.8 MΩ, Ry = 1 MΩ for Vout = 3.3 V
(4) For proper sequencing of output, enable of the LDOs are fed either from 1.2-V output from DCDC3 converter
if DVDDX is 1.8 V or from 1.8-V output from DCDC2 converter if DVDDX is 3.3 V.
Figure 2. Optional circuit for DVDD_A, DVDD_B and DVDD_C
4 List of Material
Count
8
2
4
1
2
3
1
RefDes
Value
C1
10 mF
C2
10 mF
C3
2.2 F
C4
2.2 F
C5
10 F
C6
10 F
C7
1.0 F
C8
1.0 F
C9
10 F
C10 10 F
C11 1.0 F
C12 1500 pF
C13 2.2 F
C14 2.2 F
C15 10 F
C16 10 F
C17 1.0 F
J1
PTC36SAAN
J2
PEC36SAAN
J3
1
J4
J5
1
J6
PTC36SAAN
PTC36SAAN
PTC36SAAN
22-05-3041
2
L1
L2
2.2 mH
2.2 mH
Table 1. PMP4977 List of Material
Description
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R,10%
Capacitor, Ceramic, 6.3V, X5R,10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R,10%
Capacitor, Ceramic, 50V, X7R, 10%
Capacitor, Ceramic, 6.3V, X5R,10%
Capacitor, Ceramic, 6.3V, X5R,10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R, 10%
Capacitor, Ceramic, 6.3V, X5R,10%
Header, 2 pin, 100mil spacing, (36-pin strip)
Header, Male 5-pin, 100mil spacing, (36-pin
strip)
Header, 2 pin, 100mil spacing, (36-pin strip)
Header, 4 pin, 100mil spacing, (36-pin strip)
Header, 2 pin, 100mil spacing, (36-pin strip)
Header, Friction Lock Ass'y, 4 pin Right
Angle
Inductor, SMT, 1.72A, 59 mΩ
Inductor, SMT, 1.72A, 59 mΩ
Size
805
805
603
603
805
805
603
603
805
805
603
603
603
603
805
805
603
0.100 x 2
0.100 inch x 5
Part Number
C2012X5R0J106K
C2012X5R0J106K
C1608X5R0J225K
C1608X5R0J225K
C2012X5R0J106K
C2012X5R0J106K
C1608X5R0J105K
C1608X5R0J105K
C2012X5R0J106K
C2012X5R0J106K
C1608X5R0J105K
C1608X7R1H152K
C1608X5R0J225K
C1608X5R0J225K
C2012X5R0J106K
C2012X5R0J106K
C1608X5R0J105K
PTC36SAAN
PEC36SAAN
0.100 x 2
0.100 x 4
0.100 x 2
0.400 x 0.500
PTC36SAAN
PTC36SAAN
PTC36SAAN
22-05-3041
0.157 x 0.157 inch VLCF4020T-2R2N1R7
0.157 x 0.157 inch VLCF4020T-2R2N1R7
MFR
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
TDK
Sullins
Sullins
Sullins
Sullins
Sullins
Molex
TDK
TDK
Area
10560
10560
5650
5650
10560
10560
5650
5650
10560
10560
5650
5650
5650
5650
10560
10560
5650
23100
60000
23100
45100
23100
227,900
36.8
36.8
SLVA340A – June 2009 – Revised May 2010
High-Integration, High-Efficiency Power Solution Using DC/DC Converters With
5
DVFS
Copyright © 2009–2010, Texas Instruments Incorporated