Texas Instruments | Powering the TMS320DM335 and TMS320DM355 with the TPS650061 | Application notes | Texas Instruments Powering the TMS320DM335 and TMS320DM355 with the TPS650061 Application notes

Texas Instruments Powering the TMS320DM335 and TMS320DM355 with the TPS650061 Application notes
Application Report
SLVA480 – October 2011
Powering the TMS320DM335 and TMS320DM355 with the
TPS650061
Daniel Acevedo
........................................................................................... Battery Power Applications
ABSTRACT
This document details the design considerations of a low-cost power solution for the TMS320DM335 and
TMS320DM355 (DM335/55) low-power application processors with a TPS650061, three-rail Power
Management Unit (PMU) or Power Management IC (PMIC).
Portable application solution size demands a high level of integration and the DM335/55 require at least
three different voltage rails with specific sequencing and reset requirements. The TPS6500061 is a highly
integrated low-cost power solution that can provide the 1.3 V, 1.8 V and 3.3 V rails and RESET signal
required by the DM335/55. The TPS650061 has a single step-down converter, two low dropout regulators
and a voltage supervisor.
Included in this document is a power solution for the DM335/55. Power requirements, illustrated
schematic, operation waveforms and bill of materials are included.
1
2
3
4
Contents
Power Requirements .......................................................................................................
1.1
Power-On Sequence ..............................................................................................
1.2
Power-Off Sequence ..............................................................................................
1.3
Power Solution .....................................................................................................
Schematic, Waveforms, and Bill of Materials ...........................................................................
2.1
Schematic ...........................................................................................................
2.2
Waveforms ..........................................................................................................
2.3
Bill of Materials .....................................................................................................
Conclusion ...................................................................................................................
References ...................................................................................................................
2
2
3
3
4
4
5
6
6
6
List of Figures
1
TPS650061 and DM335/55 Simplified Block Diagram ................................................................. 2
2
TPS650061 Schematic Diagram .......................................................................................... 4
3
TPS650061 Power-Up, Ch. 1 - VIN, Ch. 2 - 1.3V Rail, Ch. 3 - 1.8V Rail, Ch. 4 - 3.3V Rail...................... 5
4
TPS650061 Power-Up and RESET, Ch. 1 - RESET, Ch. 2 - 1.3V Rail, Ch. 3 - 1.8V Rail, Ch. 4 - 3.3V
Rail ............................................................................................................................ 5
5
TPS650061 Power-Off Sequence, Ch. 1 - RESET, Ch. 2 - 1.3V Rail, Ch. 3 - 1.8V Rail, Ch. 4 - 3.3V
Rail ............................................................................................................................ 5
List of Tables
1
DM335/55 Power Requirements .......................................................................................... 2
2
Bill of Materials .............................................................................................................. 6
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1
Power Requirements
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TPS650061
VIN
VIN
VODC
CVDD, VDDA_PLL1/2,
VDDD13_UDB,
VDDA13_USB
EN_DCDC
47.5k
100k
EN_LDO1
VLDO1
3.3V
EN_LDO2
475k
VLDO2
DM335/DM355
1.3V
1.8V
/RST
DVDD,
VDDA33_DDRDLL,
VDDA33_USB,
VDDA33_USB_PLL,
VDD_VIN, VDD_VOUT
VDD_DDR, VDDA18_DAC
RESET
Figure 1. TPS650061 and DM335/55 Simplified Block Diagram
1
Power Requirements
The DM335/55 power requirements are listed in Table 1.
Table 1. DM335/55 Power Requirements
Rail Name
Voltage (V)
Imax (mA)
Tolerance
Power-On
Power-Off
CVDD, VDDA_PLL1, VDDA_PLL2,
VDDD13_USB, VDDA13_USB
1.3
210
±5%
1st
2nd
VDD_DDR, VDDA18_DAC
1.8
30
±5%
2nd
1st
±5%
nd
1st
DVDD, VDDA33_DDRDLL,
VDDA33_USB, VDDA33_USB_PLL,
VDD_VIN,VDD_VOUT
3.3
95
2
The TPS650061 meets these power requirements with its single step-down converter, two low dropout
regulators and voltage supervisor.
1.1
Power-On Sequence
To meet the DM335/55 power-on requirements, the 1.3V rail must power on first, then both the 1.8V rail
and the 3.3V. After all 3 rails are powered on RESET may be released.
The power-on sequence is described in the following text from the DM335/355 datasheet.
Per the excerpt from the DM335/55 datasheet, the device should be powered-on in the following order:
1. Power on 1.3 V: CVDD, VDDA_PLL1/2, VDDD13_USB, VDDA13_USB
2. Power on 1.8 V: VDD_DDR, VDDA18_DAC
3. Power on 3.3 V: DVDD, VDDA33_DDRDLL, VDDA33_USB, VDDA33_USB_PLL, VDD_VIN,
VDD_VOUT
2
Powering the TMS320DM335 and TMS320DM355 with the TPS650061
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Power Requirements
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You may power-on the 1.8 V and 3.3 V power supplies simultaneously
1.2
Power-Off Sequence
The DM335/55 power-down requirements state that the 1.8 V and 3.3 V supplies should power off
together, before the 1.3 V supply as describe in the DM335/355 datasheet excerpt below:
1. Power off 3.3 V: DVDD, VDDA33_DDRDLL, VDDA33_USB, VDDA33_USB_PLL, VDD_VIN,
VDD_VOUT
2. Power off 1.8 V: VDD_DDR, VDDA18_DAC
3. Power off 1.3 V: CVDD, VDDA_PLL1/2, VDDD13_USB, VDDA13_USB
You may power-off the 1.8 V and 3.3 V power supplies simultaneously.
Power-off the 1.8V/3.3V supply before or within 10usec of power-off of the 1.3 V supply
1.3
Power Solution
To best achieve this power up/down sequence and minimize cost, two 2N222 transistors are used in
conjunction with the TPS650061.
• The enable for the 1.3V supply (EN_DCDC) is connected to VIN.
• The output, VODC, is connected to the base of an NPN transistor, Q1. The collector of Q1 has a 100
kΩ pull-up to VIN; the emitter is connected to ground.
• The collector of Q1 is also connected to the base of another NPN transistor, Q2. The collector of Q2
has a 47.5k pull-up to VIN; the emitter is connected to ground
• The collector of Q2 is also connected to the enable of the 1.8 V supply (EN_LDO2).
• The 1.8 V supply (VLDO2) is connected to the enable of the 3.3 V supply (EN_LDO1).
• When VIN is applied, it will turn on the 1.3 V supply (VODC) and Q2; keeping EN_VLDO2 tied to
ground.
• VODC will then turn on Q1 which will turn-off Q2 and enable VLDO2 when EN_LDO2 gets pulled-up to
VIN.
• VLDO2 will enable VLDO1.
• During power-off, the 3.3 V rail ramps down with VIN as VIN nears VOUT, then the 1.8 V rail, then the
1.3 V rail.
• A resistor divider connects RSTSNS to VLDO1, the MR pin is connected to VODC and the pin RST is
pulled up to VLDO2. This will assert the reset to 1.8 V only when all three supplies are up.
• Additionally, to add deglitch time to the RESET, a capacitor (C5) can be added in parallel with the top
resistor of the RTSNS divider.
The proper connections for the power-on/off sequence are shown in Figure 1.
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3
Schematic, Waveforms, and Bill of Materials
2
Schematic, Waveforms, and Bill of Materials
2.1
Schematic
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This is the schematic of the power solution for the DM335/55.
Figure 2. TPS650061 Schematic Diagram
4
Powering the TMS320DM335 and TMS320DM355 with the TPS650061
Copyright © 2011, Texas Instruments Incorporated
SLVA480 – October 2011
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Schematic, Waveforms, and Bill of Materials
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2.2
Waveforms
The following waveforms demonstrate the startup and power down sequence of the TPS650061 as
required by the DM335/55. Figure 3, shows the TPS650061 power on sequence of 1.3V then 1.8 V and
3.3 V. Figure 4 shows the reset pin, RST, being released after the voltage on RSTSNS rises above the
threshold and after the reset recovery time, tRST, is exceeded. Figure 5 shows the power down sequence,
3.3 V and 1.8 V then the 1.3 V supply. For the following tests, the 1.3V supply had a 200mA load, the
1.8V supply had a 95mA load and the 3.3V supply had a 30mA load.
Figure 3. TPS650061 Power-Up, Ch. 1 - VIN, Ch. 2 1.3V Rail, Ch. 3 - 1.8V Rail, Ch. 4 - 3.3V Rail
Figure 4. TPS650061 Power-Up and RESET, Ch. 1 RESET, Ch. 2 - 1.3V Rail, Ch. 3 - 1.8V Rail, Ch. 4 - 3.3V
Rail
Figure 5. TPS650061 Power-Off Sequence, Ch. 1 - RESET, Ch. 2 - 1.3V Rail, Ch. 3 - 1.8V Rail, Ch. 4 - 3.3V Rail
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5
Conclusion
2.3
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Bill of Materials
The bill of materials is displayed in Table 2.
Table 2. Bill of Materials
Count
RefDes
Value
Description
Size
Part Number
MFR
4
C1, C6, C8, C9
10uF
Capacitor, Ceramic, 10V, X5R, 10%,
0805
Std
Std
2
C2, C3
2.2uF
Capacitor, Ceramic, 10V, X5R, 10%
0603
Std
Std
1
C4
0.1uF
Capacitor, Ceramic, 16V, X7R, 10%
0603
Std
Std
1
C7
22pF
Capacitor, Ceramic, 50V, C0G, 5%
0603
Std
Std
1
L1
2.2uH
Inductor, SMT, 2.0A, 110milliohm
0.118 x 0.118 inch
LPS3015-222ML
Coilcraft
2
Q1, Q2
2N2222
Transistor, NPN, 40V
SOT-23
2N2222
Std
2
R2, R9
47.5k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R3
976k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2
R5, R7
475k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R4
232K
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R6
402k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R8
100k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
TPS650061RUK
IC, 2.25 MHz Step Down Converter with Dual
LDOs and SVS
QFN
TPS650061RUK
TI
1
3
U1
Conclusion
The TPS650061 provides a low cost, comprehensive power solution for the DM335/55. A 1.3 V rail
(capable of supplying 1 A) is powered on followed by a 1.8 V rail (300 mA) then a 3.3 V rail (300 mA).
Once all three supplies have reached regulation, RESET goes high (i.e. rises to its pull-up voltage). For
power-down, the 1.8 V and 3.3 V turn off before the 1.3 V rail. This meets the power requirements of the
DM335/55.
4
References
1.
2.
3.
4.
6
TPS650061 Datasheet (SLVS810B)
DM335 Datasheet (SPRS528)
DM355 Datasheet (SPRS463)
5Vin DM355 Power using LDO's (SLVR331B)
Powering the TMS320DM335 and TMS320DM355 with the TPS650061
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SLVA480 – October 2011
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