Cover
88PG8237, 88PG8227, 88PG8226, 88PG8216, 88PG8204
Field Programmable DSP Switcher™ Family
1MHz, Dual Step-down Regulator with AnyVoltage™ Technology
Datasheet
Doc. No. MV-S103563-00, Rev. C April 23, 2008 Marvell. Moving Forward Faster
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88PG82XX Datasheet
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Disclaimer No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose, without the express written permission of Marvell. Marvell retains the right to make changes to this document at any time, without notice. Marvell makes no warranty of any kind, expressed or implied, with regard to any information contained in this document, including, but not limited to, the implied warranties of merchantability or fitness for any particular purpose. Further, Marvell does not warrant the accuracy or completeness of the information, text, graphics, or other items contained within this document. Marvell products are not designed for use in life-support equipment or applications that would cause a life-threatening situation if any such products failed. Do not use Marvell products in these types of equipment or applications. With respect to the products described herein, the user or recipient, in the absence of appropriate U.S. government authorization, agrees: 1) Not to re-export or release any such information consisting of technology, software or source code controlled for national security reasons by the U.S. Export Control Regulations ("EAR"), to a national of EAR Country Groups D:1 or E:2; 2) Not to export the direct product of such technology or such software, to EAR Country Groups D:1 or E:2, if such technology or software and direct products thereof are controlled for national security reasons by the EAR; and, 3) In the case of technology controlled for national security reasons under the EAR where the direct product of the technology is a complete plant or component of a plant, not to export to EAR Country Groups D:1 or E:2 the direct product of the plant or major component thereof, if such direct product is controlled for national security reasons by the EAR, or is subject to controls under the U.S. Munitions List ("USML"). At all times hereunder, the recipient of any such information agrees that they shall be deemed to have manually signed this document in connection with their receipt of any such information. Copyright © 2008. Marvell International Ltd. All rights reserved. Marvell, the Marvell logo, Moving Forward Faster, Alaska, Fastwriter, Datacom Systems on Silicon, Libertas, Link Street, NetGX, PHYAdvantage, Prestera, Raising The Technology Bar, The Technology Within, Virtual Cable Tester, and Yukon are registered trademarks of Marvell. Ants, AnyVoltage, Discovery, DSP Switcher, Feroceon, GalNet, GalTis, Horizon, Marvell Makes It All Possible, RADLAN, UniMAC, and VCT are trademarks of Marvell. All other trademarks are the property of their respective owners.
Doc. No. MV-S103563-00 Rev. C Page 2 Document Classification: Proprietary Information
Copyright © 2008 Marvell April 23, 2008, 2.00
88PG82XX
Field Programmable DSP Switcher™ Family
Datasheet
PRODUCT OVERVIEW
The 88PG82XX family integrates the dual synchronous Step-Down (Buck) switching regulators housed in a 3 X 4mm QFN-20 package. Internally self-compensated, the step-down regulator requires no external compensation and works with low-ESR output capacitors to simplify the design, minimize the board space, and reduce the amount of external components. The switching frequency for the step-down regulator is 1MHz, allowing the use of low profile surface mount inductors and low value capacitors. Each step-down regulator includes programmable output voltage to allow the user to easily set the output voltage with external resistors, logic control, or serial data interface. The output voltage range is 0.72V to 3.63V. The 88PG82XX family operates from an input voltage range of 2.75V to 5.5V, making the device well suited for portable applications. Other key features of the 88PG82XX family include soft start, an internal current limit, an under-voltage lockout, thermal shutdown, over voltage protection, and power-on-reset signals. Dual switching regulators 1MHz switching frequency Low quiescent current of 2.1 mA (typ.) Stable with low-ESR ceramic output capacitors No external compensation required Up to 95% efficiency Input voltage range: 2.75V to 5.5V Programmable output voltage range: 0.72V to 3.63V Serial / Logic Programmability Any VoltageTM Technology provides 64 output voltage selections to provide up most flexibility Built-in undervoltage lockout Over voltage protection Thermal shutdown protection Output short circuit protection Output voltage margining capability Lead-free packages
Applications
Portable and handheld computing Point-of-load power supplies DSP power supplies Disk drive power supplies
Features
Tiny 3 X 4 mm QFN-20 package
Figure 1: Typical Application Circuit: Output 1.8V/1.5A and 1.2V/1.5A
R1 C1 0.1uF R4 100k R3 100k R2 100k 4 11 16 6 1 13 12 14 15 R7 160k R8 0 R5 51k R6 0 10 ohm 3 17 SVIN PVIN2 SGND POR1 POR2 SDI PGND1 EN SW2 VSET1 SW2 PSET1 VSET2 PSET2 SFB2 PGND2 2 22uF/6.3V 19 C2 10 PVIN1 SW1 SW1 7 L1 9 3.3uH 5 22uF/6.3V 8 18 L2 20 3.3uH C4 C3 22uF/6.3V C5
Vin 2.75V - 5.5V
22uF/6.3V
POR 1 POR 2 SDI EN
Vout1 2.5V/1.5A
88PG8226
SFB1
Vout2 1.5V/1.5A
Copyright © 2008 Marvell April 23, 2008, 2.00 Document Classification: Proprietary Information
Doc. No. MV-S103563-00 Rev. C Page 3
88PG82XX Datasheet
Caution: This is a very high frequency device, proper PCB layout is required. Refer to page 47 for further details.
:
Table 1:
DC Loading Current Ratings
Buck 2
Buck 1 0 .7 5 A 1 .0 A 1 .5 A 2 .0 A
0.75A 88PG8204
1
1.0A 88PG8205 88PG8215 88PG8225 88PG8235
1 .5 A 88PG8206 88PG8216
1
2 .0 A 88PG8207 88PG8217 88PG82271 88PG82371
88PG8214 88PG8224 88PG8234
88PG82261 88PG8236
1. The part numbers in Bold are released to production. The other parts are available upon request. Contact Marvell® marketing for availability.
The devices shown in Table 1 have the same input and output voltage range for step-down registers.
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Copyright © 2008 Marvell April 23, 2008, 2.00
Table of Contents
Table of Contents
Product Overview ....................................................................................................................................... 3 Table of Contents ....................................................................................................................................... 5 List of Tables .............................................................................................................................................. 7 List of Figures............................................................................................................................................. 9 1
1.1 1.2
Signal Description ....................................................................................................................... 11
Pin Configuration.............................................................................................................................................11 Pin Description ................................................................................................................................................12 1.2.1 Pin Types ..........................................................................................................................................12
2
2.1 2.2 2.3 2.4
Electrical Specifications ............................................................................................................. 15
Absolute Maximum Ratings ............................................................................................................................15 Recommended Operating Conditions .............................................................................................................15 Electrical Characteristics .................................................................................................................................16 Switching Step-down Regulator ......................................................................................................................17
3
3.1 3.2
Functional Description................................................................................................................ 19
Regulation and Start-up ..................................................................................................................................19 3.1.1 Soft Start and Sequencing ................................................................................................................20 Output Voltage Settings ..................................................................................................................................22 3.2.1 Logic Programmability ......................................................................................................................22 3.2.2 Serial Programmability......................................................................................................................23 3.2.3 Output Voltage – AnyVoltage™ Technology ....................................................................................25 Undervoltage Lockout (UVLO) ........................................................................................................................28 Over Voltage Protection (OVP) .......................................................................................................................28 Power-On Reset (POR) ..................................................................................................................................28 Thermal Shutdown ..........................................................................................................................................29 Adaptive Transient Response .........................................................................................................................29
3.3 3.4 3.5 3.6 3.7
4
4.1 4.2 4.3 4.4
Functional Characteristics ......................................................................................................... 31
Start-Up Waveforms........................................................................................................................................31 Short-Circuit Waveforms .................................................................................................................................32 Switching Waveforms......................................................................................................................................33 Load Transient Waveforms .............................................................................................................................34 4.4.1 Step-Down Regulator .......................................................................................................................34 4.4.2 Cross-Talk Waveforms .....................................................................................................................36 Output Voltage Transient Waveforms .............................................................................................................37 4.5.1 Step-Down Regulator .......................................................................................................................37
4.5
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Doc. No. MV-S103563-00 Rev. C Page 5
88PG82XX Datasheet
4.6
Line Transient Waveforms ..............................................................................................................................38
5
5.1 5.2 5.3 5.4 5.5 5.6 5.7
Typical Characteristics ............................................................................................................... 39
Efficiency Graphs ............................................................................................................................................39 5.1.1 Efficiency Graphs in Log Scale .........................................................................................................39 Load Regulation ..............................................................................................................................................40 Dropout Voltage ..............................................................................................................................................40 RDS (ON) Resistance .....................................................................................................................................40 IC Case and Inductor Temperature.................................................................................................................41 Input Voltage Graphs ......................................................................................................................................43 5.6.1 Step-Down Regulator .......................................................................................................................44 Temperature Graphs .......................................................................................................................................45 5.7.1 Step-Down regulator .........................................................................................................................46
6
6.1
Applications Information ............................................................................................................ 47
PC Board Layout Considerations and Guidelines ...........................................................................................47 6.1.1 PC Board Layout Examples for 88PG82XX .....................................................................................50 6.1.2 Bill of Materials (BOM) ......................................................................................................................52
7
7.1 7.2 7.3
Mechanical Drawing .................................................................................................................... 55
88PG82XX Mechanical Drawing .....................................................................................................................55 Dimensions .....................................................................................................................................................56 Typical Pad Layout Dimensions ......................................................................................................................57 7.3.1 Recommeded Solder Pad Layout .....................................................................................................57
8
8.1 8.2 8.3
Ordering Information................................................................................................................... 59
Ordering Part Numbers and Package Markings..............................................................................................59 Sample Ordering Part Number........................................................................................................................59 Package Marking ............................................................................................................................................60 8.3.1 88PG82XX Package Marking and Pin 1 Locations ..........................................................................60
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Copyright © 2008 Marvell April 23, 2008, 2.00
List of Tables
List of Tables
Table 1: DC Loading Current Ratings...............................................................................................................4
1
Signal Description ............................................................................................................................ 11
Table 2: Table 3: Pin Type Definitions ..........................................................................................................................12 Pin Descriptions ................................................................................................................................12
2
Electrical Specifications .................................................................................................................. 15
Table 4: Table 5: Table 6: Table 7: Absolute Maximum Ratings ..............................................................................................................15 Recommended Operating Conditions...............................................................................................15 Electrical Characteristics Table ........................................................................................................16 Switching Step-down Regulator Table..............................................................................................17
3
Functional Description..................................................................................................................... 19
Table 8: Table 9: Table 10: Table 11: Table 12: Table 13: Table 14: Logic Programmability Table ............................................................................................................22 Default Value of Data Field ...............................................................................................................24 Voltage and Percentage Set .............................................................................................................24 Output Voltage Selection ..................................................................................................................24 AnyVoltage™ Programming Table for 1% Resistors ........................................................................25 AnyVoltage™ Programming Table for 5% Resistors ........................................................................26 Output Voltage Option Steps ............................................................................................................27
4 5 6
Functional Characteristics............................................................................................................... 31 Typical Characteristics .................................................................................................................... 39 Applications Information ................................................................................................................. 47
Table 15: Table 16: BOM for 88PG82XX .........................................................................................................................52 Ceramic Capacitor Cross Reference ................................................................................................54
7 8 A
Mechanical Drawing ......................................................................................................................... 55
Table 17: Package Dimensions ........................................................................................................................56
Ordering Information........................................................................................................................ 59
Table 18: 88PG82XX Ordering Part Numbers..................................................................................................59
Revision History ............................................................................................................................... 61
Table 19: Revision History ................................................................................................................................61
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88PG82XX Datasheet
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List of Figures
List of Figures
Figure 1: Typical Application Circuit: Output 1.8V/1.5A and 1.2V/1.5A .............................................................3
1
Signal Description ........................................................................................................................... 11
Figure 2: 88PG82XX Family 3X4mm QFN-20 Package—Top View................................................................11
2 3
Electrical Specifications ................................................................................................................. 15 Functional Description.................................................................................................................... 19
Figure 3: Figure 4: Figure 5: Figure 6: Figure 7: Figure 8: Figure 9: Figure 10: Figure 11: Figure 12: Figure 13: Figure 14: Figure 15: 88PG82XX Block Diagram ...............................................................................................................19 Output Voltage Window ....................................................................................................................20 Startup without Sequencing ..............................................................................................................20 Startup with Sequencing and Soft Start (COUT= 22 μF) ...................................................................20 Fast Startup (0.8V, 1.2V, 1.8V, 2.5V, 3.3V) .................................................................................21 Soft Start up (0.8V, 1.2V, 1.8V, 2.5V, 3.3V) .....................................................................................21 Inrush Current with COUT = 100 μF ..................................................................................................21 Serial Programmability......................................................................................................................23 Startup Sequence ............................................................................................................................27 VSET = 2.5V and PSET = -5% .........................................................................................................27 UVLO and OVP Waveforms .............................................................................................................28 Power-On Reset Waveforms ............................................................................................................28 Adaptive Transient Response ..........................................................................................................29
4
Functional Characteristics.............................................................................................................. 31
Figure 16: Figure 17: Figure 18: Figure 19: Figure 20: Figure 21: Figure 22: Figure 23: Figure 24: Figure 25: Figure 26: Figure 27: Figure 28: Figure 29: Figure 30: Figure 31: Figure 32: Figure 33: Startup Using the Enable Pin ...........................................................................................................31 Turn Off Using the Enable Pin ..........................................................................................................31 Startup Sequence ............................................................................................................................31 Hot Plug ............................................................................................................................................31 UVLO and OVP Thresholds..............................................................................................................32 Input Soft Start and Start up Sequence ............................................................................................32 Step-Down Short-Circuit Response .................................................................................................32 Switching Waveforms - PWM mode ................................................................................................33 Switching Waveforms - PWM mode .................................................................................................33 Switching Waveforms - DCM Mode .................................................................................................33 Switching Waveforms - DCM Mode-Zoom........................................................................................33 PWM Output Ripple Voltage ............................................................................................................34 Fast Load Rise Time ........................................................................................................................34 Slow Load Rise Time ........................................................................................................................34 Fast Load Fall Time .........................................................................................................................35 Slow Load Fall Time .........................................................................................................................35 Load Transient Response ................................................................................................................35 Double-Pulsed Load Response ........................................................................................................35
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88PG82XX Datasheet
Figure 34: Figure 35: Figure 36: Figure 37: Figure 38: Figure 39: Figure 40: Figure 41: Figure 42: Figure 43: Figure 44: Figure 45:
Load Transient Response ................................................................................................................36 Double-Pulsed Load Response ........................................................................................................36 Cross-talk Continuous Mode ...........................................................................................................36 Cross-talk Discontinuous Mode ........................................................................................................36 VOUT = 1.0V to 1.2V with No Load ...................................................................................................37 VOUT = 1.0V to 1.5V with No Load....................................................................................................37 VOUT = 1.0V to 1.2V with ILOAD = 1.5A.............................................................................................37 VOUT = 1.0V to 1.5V with ILOAD = 1.5A.............................................................................................37 VOUT = 1.2V to 1.0V with ILOAD = 1.5A.............................................................................................38 VOUT = 1.5V to 1.0V with ILOAD = 1.5A.............................................................................................38 Line Transient @ VIN = 3.6V.............................................................................................................38 Line Transient @ VIN = 4.5V.............................................................................................................38
5 6
Typical Characteristics ................................................................................................................... 39 Applications Information ................................................................................................................ 47
Figure 46: Figure 47: Figure 48: Figure 49: Simpified Schematic .........................................................................................................................48 PC Board Schematic ........................................................................................................................49 Top Silk-Screen, Top Traces, Vias, and Top Copper (Not to Scales) ..............................................50 Bottom Silk Screen, Bottom Trace, Vias, and Bottom Copper (Not to Scale)...................................51
7 8
Mechanical Drawing ........................................................................................................................ 55 Ordering Information....................................................................................................................... 59
Figure 50: Figure 51: Sample Part Number ........................................................................................................................59 88PG8227 Package Marking and Pin 1 Location .............................................................................60
A
Revision History ............................................................................................................................... 61
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Copyright © 2008 Marvell April 23, 2008, 2.00
Signal Description
Pin Configuration
1
1.1
Signal Description
Pin Configuration
Figure 2: 88PG82XX Family 3X4mm QFN-20 Package—Top View
SW2 20
PGND2 19
SW2 18
PVIN2 17
EN
1
16
POR 2
SFB2
2
15
PSET 2
SVIN
3
14
VSET 2
SGND
4
13
VSET 1
SFB1
5
12
PSET 1
SDI/ ENSEQ
6
11
POR1
7
8
9
10
SW1
PGND1
SW1
PVIN1
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88PG82XX Datasheet
1.2
1.2.1
Table 2:
Pi n Typ e I O S NC GND
Pin Description
Pin Types
Pin Type Definitions
D e f in it io n Input Only Output Only Supply Not Connected Ground
Table 3 provides pin descriptions for the 88PG82XX.
Table 3:
Pi n # 1
Pin Descriptions
P in N a m e EN Pi n Typ e I P i n D es c r ip t i o n Enable. Logic high (> 2.0V) enables both switching regulators. Logic low ( 2.0V) enables soft start and sequence. Buck 1 starts followed by Buck 2, once VOUT1 is within a specified tolerance. The soft start rise time is typically 5 ms and is dependent on output, but independent of capacitance and load current. If a short circuit is detected on Buck1, then Buck 2 will be disabled. Logic low (< 0.8V) disables the start up sequence. Buck 1 and Buck 2 will start up together without any soft start. Serial Data Input. The input data into this pin is used to program the output voltage (See “Output Voltage Settings” on page 22). The power-good signal has to be high before the serial data interface can be used. To implement soft start a 10K pull-up resistor must be connected to SVIN. This pin is internally pulled down by a 10 μA current source.
7, 9 8
SW1 PGND1
O GND
Switch Node for regulator 1. Internal power MOSFET drain. Connects to an external inductor. Power Ground. The power ground must be connected to the negative terminal of the input and output capacitors. Power Input Voltage. Internal power MOSFET source. Connect the 10µF decoupling capacitor between PVIN and PGND and position it as close as possible to the IC. NOTE: PVIN and PVIN2 must be connected together and should not be separated. Power-On Reset 1. This pin is an open drain output to indicate the status of the output voltage. The output pin goes high 40 ms after the output voltage is within the specified tolerance. POR2 and POR1 can be connected to the same external pull-up resistor to indicate “both outputs good”. Percent Set for Regulator 1. 1. Resistor Programming: Connect an external resistor to ground to set the output voltage of the switching regulator. See the “Electrical Characteristics” for resistor values and Output Voltage Settings. Use resistor values with a tolerance of 5% or better. The total capacitance across this pin and GND should be equal to 25 pF or less. If the pin is not used, it must be connected to GND. 2. Logic Programming: Four output voltage levels (1.8V, 2.5V, 3.0V, 3.3V) can be set by connecting the VSET and PSET pins to either GND or SVIN. Voltage Set for Regulator 1. 1. Resistor Programming: Connect an external resistor to ground to set the output voltage of the switching regulator. See the “Electrical Characteristics” for resistor values and Output Voltage Settings. Use resistor values with a tolerance of 5% or better. The total capacitance across this pin and GND should be equal to 25 pF or less. 2. Logic Programming: Four output voltage levels (1.8V, 2.5V, 3.0V, 3.3V) can be set by connecting the VSET and PSET pins to either GND or SVIN.
10
PVIN1
S
11
POR1
O
12
PSET1
I
13
VSET1
I
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Doc. No. MV-S103563-00 Rev. C Page 13
88PG82XX Datasheet
Table 3:
Pi n # 14
Pin Descriptions
P in N a m e VSET2 Pi n Typ e I P i n D es c r ip t i o n Voltage Set for Regulator 2. 1. Resistor Programming: Connect an external resistor to ground to set the output voltage of the switching regulator. See the “Electrical Characteristics” for resistor values and Output Voltage Settings. Use resistor values with a tolerance of 5% or better. The total capacitance across this pin and GND should be equal to 25 pF or less. 2. Logic Programming: Four output voltage levels (0.8V, 1.0V, 1.2V, and 1.5V) can be set by connecting the VSET and PSET pins to either GND or SVIN. Percent Set for Regulator 2. 1. Resistor Programming: Connect an external resistor to ground to set the output voltage of the switching regulator. See the “Electrical Characteristics” for resistor values and Output Voltage Settings. Use resistor values with a tolerance of 5% or better. The total capacitance across this pin and GND should be equal to 25 pF or less. If the pin is not used, it must be connected to GND. 2. Logic Programming: Four output voltage levels (0.8V, 1.0V, 1.2V, and 1.5V) can be set by connecting the VSET and PSET pins to either GND or SVIN. Power-On Reset 2. This pin is an open drain output to indicate the status of the output voltage. The output pin goes high 40 ms after the output voltage is within the specified tolerance. POR2 and POR1 can be connected to the same external pull up resistor to indicate “both output good”. Power Input Voltage for regulator 2: Internal power MOSFET source. Connect the 10 µF decoupling capacitor between PVIN2 and PGND2 and position it as close as possible to the IC. NOTE: PVIN and PVIN2 must be connected together and should not be separated. Power Ground for regulator 2: The power ground must be connected to the negative terminal of the input and output capacitors. Switch Node for regulator 2: Internal power MOSFET drain. Connects to an external inductor.
15
PSET2
I
16
POR2
O
17
PVIN2
S
19 18, 20
PGND2 SW2
GND O
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Electrical Specifications
Absolute Maximum Ratings
2
2.1
Table 4:
Parameter
Electrical Specifications
Absolute Maximum Ratings
Absolute Maximum Ratings1
S y m bo l SVIN PVIN1, PVIN2 VSW1, VSW2 VSFB1, VSFB2 VVSET1, VVSET2 VPSET1, VPSET2 VEN VPOR VSDI
3
R a ng e -0.3 to 6.0 -0.3 to 6.0 -0.6 to (SVIN +0.3) -0.6 to (SVIN +0.3) -0.6 to (SVIN +0.3) -0.6 to (SVIN +0.3) -0.6 to (SVIN +0.3) -0.6 to (SVIN +0.3) -0.6 to (SVIN +0.3) -40 to 85 125 -65 to 150 2
U n i ts V V V V V V V V V °C °C °C kV
Signal Input Voltage Power Input Voltage Switch Voltage
2
Switching Regulator Feedback Voltage Voltage Set Percentage Set Voltage Enable POR Voltage SDI Voltage Operating Temperature Range
TOP TJMAX TSTOR
Maximum Junction Temperature Storage Temperature Range ESD Rating
4
1. Exceeding the absolute maximum rating may damage the device 2. -10V to (VIN +0.3)V for less than 50μs 3. Specifications over the -40°C to 85°C operating temperature ranges are assured by design, characterization and correction with statistical process controls 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF
2.2
Table 5:
Parameter
Recommended Operating Conditions
Recommended Operating Conditions1
S y m bo l SVIN PVIN1, PVIN2 θJA θJC r a n ge 2.75 to 5.5 2.75 to 5.5 70 19 U ni ts V V °C/W °C/W
Single Input Voltage Power Input Voltage Package Thermal Resistance2
1. This device is not gauranteed to function outside the specified operating range 2. Test on 4-layer (JESD51-7) and vias (JESD51-5) board
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Doc. No. MV-S103563-00 Rev. C Page 15
88PG82XX Datasheet
2.3
Electrical Characteristics
The following applies unless otherwise noted: SVIN = PVIN1= PVIN2, VVSET1 = VPSET = 0, VOUT1 = 1.8V, VVSET2 = SVIN, VPSET2 = 0, VOUT2 = 1.2V, VEN = SVIN, L (BUCK1) = 2.2 µH, COUT (BUCK1) = 22µF (Ceramic), L (BUCK2) = 2.2 µH, COUT (BUCK2) = 22 µF (Ceramic), TA = 25 °C. Bold values indicate -40 °C < TA < 85 °C.
Table 6:
Electrical Characteristics Table
Parameter Signal Input Voltage Range Power Input Voltage Range Total Quiescent Current Shutdown Supply Current Undervoltage Lockout
S y m b ol SVIN PVIN
C o nd i ti on s SVIN = PVIN
Min 2.75 2.75
Ty p
Max 5.5 5.5
U n i ts V V mA
No load ISVIN VUVLO VEN = 0V High threshold, SVIN increasing Low threshold, SVIN decreasing 2.44
2.1 1 2.65 2.55 5.7 5.6 1.70 0.7 1 10 150 20 50 2.70
μA
V V
Over-voltage Protection
VOVP
High threshold, SVIN increasing Low threshold, SVIN decreasing
V
EN Threshold Voltage
VEN
Enable regulators Disable regulators
V
EN Pin Input Current
IEN
VEN = 5.0V VEN = 0V
μA
°C
Over-temperature Thermal Shutdown
TOTS
TJ increasing (Disable regulators) TJ decreasing (Enable regulators)
105
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Electrical Specifications
Switching Step-down Regulator
2.4
Switching Step-down Regulator
The following applies unless otherwise noted: SVIN = PVIN1 = PVIN2, VVSET1 = VPSET = 0, VOUT1 = 1.8V, VVSET2 = SVIN, VPSET2 = 0, VOUT2 = 1.2V, VEN = SVIN, L (BUCK1) = 2.2 µH, COUT (BUCK1) = 22 µF (Ceramic), L (BUCK2) = 2.2 µH, COUT (BUCK2) = 22 µF (Ceramic), TA = 25 °C. Bold values indicate -40 °C < TA < 85 °C.
Table 7:
Switching Step-down Regulator Table
Parameter Minimum Peak Switch Current Limit
S y m b ol ILIM
C o nd i ti on s 88PG8204 = VOUT1 88PG8204 = VOUT2 88PG8216 = VOUT1 88PG8216 = VOUT2 88PG8226 = VOUT1 88PG8226 = VOUT2 88PG8227 = VOUT1 88PG8227 = VOUT2 88PG8237 = VOUT1 88PG8237 = VOUT2 88PG8204 = VOUT1, L1 = 4.7 μH 88PG8204 = VOUT2, L2 = 4.7 μH 88PG8216 = VOUT1, L1 = 4.7 μH 88PG8216 = VOUT2, L2 = 3.3 μH 88PG8226 = VOUT1, L1 = 3.3 μH 88PG8226 = VOUT2, L2 = 3.3 μH 88PG8227 = VOUT1, L3 = 3.3 μH 88PG8227 = VOUT2, L4 = 2.0 μH 88PG8237 = VOUT1, L1 = 2.0 μH 88PG8237 = VOUT2, L2 = 2.0 μH
Min
Ty p 1.12 1.12 1.5 2.25 2.25 2.25 2.25 3.0 3.0 3.0 0.75 0.75 1.0 1.5 1.5 1.5 1.5 2.0 2.0 2.0 0.8 1.0 1.2 1.5 1.8 2.5 3.0 3.3 1.8 2.5 3.0 3.3
Max
U n i ts
A
Maximum Output Current
IOUT
A
Output Voltage
VOUT
RVSET = 11K RVSET = 18K RVSET = 30K RVSET = 51K RVSET = 100K RVSET = 160K RVSET = 270K RVSET = 470K
V
Output Voltage 1, Logic Programmability
VOUT1
VVSET1 = 0V, VPSET1 = 0V VVSET1 = 0V, VPSET1 = SVIN VVSET1 = SVIN, VPSET1 = 0V VVSET1 = SVIN, VPSET1 = SVIN
V
Copyright © 2008 Marvell April 23, 2008, 2.00 Document Classification: Proprietary Information
Doc. No. MV-S103563-00 Rev. C Page 17
88PG82XX Datasheet
Parameter Output Voltage 2, Logic Programmability
S y m b ol VOUT2
C o nd i ti on s VVSET2 = 0V, VPSET2 = 0V VVSET2 = 0V, VPSET2 = SVIN VVSET2 = SVIN, VPSET2 = 0V VVSET2 = SVIN, VPSET2 = SVIN
Min
Ty p 0.8 1.0 1.2 1.5 -10 -7.5 -5 -2.5 0 2.5 5 7.5 10 0.05
Max
U n i ts
V
Percentage Set
RVSET = 11K RVSET = 18K RVSET = 30K RVSET = 51K RVSET = 0K RVSET = 100K RVSET = 160K RVSET = 270K RVSET = 470K
%
Output Voltage Line Regulation Output Voltage Load Regulation Switching Frequency Switch Leakage Current
VLNREG
SVIN = PVIN = 3.0V to 5.0V VOUT = 1.5V ILOAD = IOUT(MAX)/4 SVIN = PVIN = 5.0V VOUT = 1.5V ILOAD = IOUT(MAX)/4 to IOUT(MAX) ILOAD = IOUT(MAX)/2 SVIN = PVIN = 5V, VEN = 0V VSW = PVIN SVIN = PVIN, VEN = 0V VSW = SGND = PGND
% 0.05 %
VLDREG
fSW ILSW
1 1 1 VOUT* 90% VOUT-13 0 mV VOUT* 90% VOUT-13 0 mV 0.4 1 40 50
MHz
μA
50
Power-On Reset Threshold Voltage for Buck1
VPORTH
VOUT > 1.35V VOUT < 1.32V
V
Power-On Reset Threshold Voltage for Buck2
VPORTH
VOUT > 1.35V VOUT < 1.32V
V
Power-On Reset Output Low Voltage Power-On Reset Leakage Current Power-On Reset Delay
VPORL IPOR tRESET
ISINK = 2 mA, VEN = SVIN VEN = 5V
V
μA
ms
Doc. No. MV-S103563-00 Rev. C Page 18 Document Classification: Proprietary Information
Copyright © 2008 Marvell April 23, 2008, 2.00
Functional Description
Regulation and Start-up
3
Functional Description
Figure 3: 88PG82XX Block Diagram
R1 C1 C5 C2
Vin 2.75V to 5.5V PVIN1
SVIN
PVIN2
+ OSCILLATOR
10 μA
INTERNAL CIRCUITRY POWER SUPPLY DSP 1 EN 1
Current Sense
+ Current Sense SW2 L1
SW1
Vout 1
C3
DSP 2 PWM CONTROL SFB1
EN
ON OFF
A/D 1
DSP 1
PGND1
EN 2
A/D 2
DSP 2
PWM CONTROL
PVIN2
SFB1
L2
PGood 1
A/D 1 Serial Data Interface THERMAL SHUTDOWN 150 ° C
A/D 2
SW2
Vout 2
C4
SDI
10 μA
PGND2
SFB1 RESISTOR NETWORK PGood1 RESISTOR NETWORK
SFB2
PGood 2 40us /40ms
Vin
R3
BAND-GAP VOLTAGE REFERENCE
UNDERVOLTAGE LOCKOUT
FAULT RESISTOR SENSING CIRCUITRY
40us /40ms RESISTOR SENSING CIRCUITRY
POR1 POR2
VPOR
SGND
VSET1
R7
PSET1
R8
VSET2
R5
PSET2
R6
3.1
Regulation and Start-up
The step-down switching regulator uses Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to regulate the output voltage using digital control. The mode of operation depends on the level of output current and the output voltage. In steady states, the step-down switching regulator monitors the current flowing through the inductor to determine if the regulator is handling heavy or light load applications. For heavy load applications, the step-down regulator operates in the PWM mode (B and C) to minimize the ripple current for optimum efficiency and to minimize the ripple output voltage. The step-down regulator operates in the PFM and Discontinuous Conduction Mode (DCM) (A and D) to limit the switching actions for optimum efficiency in light load applications. In this mode, the average output voltage is slightly higher than the average output voltage for heavy transient load applications.
Copyright © 2008 Marvell April 23, 2008, 2.00 Document Classification: Proprietary Information
Doc. No. MV-S103563-00 Rev. C Page 19
88PG82XX Datasheet
Figure 4: Output Voltage Window
Typical VOUT
A B C D
PFM Mode PWM Mode PFM Mode
3.1.1
Soft Start and Sequencing
The 88PG82XX device’s outputs can either be sequenced to start up together or have VOUT1 start followed by VOUT2. When the SDI pin is low, the VOUT1 and VOUT2 will start up together with a start up time in the order of 100 μs, as shown in Figure 5. If the SDI pin is high, then VOUT1 will start first and VOUT2 will start as soon as VOUT1 is within its specified tolerance (see Figure 6). Both outputs will have a soft start ramp. The POR2 output will go high 40 ms after VOUT2 is within its regulation limits. Soft start is a highly desirable property in “Hot-Plug” applications. The 88PG82XX starts up in less then 100 μs when soft-start is disabled (Figure 7). However in soft-start mode, the 88PG82XX controls the rise time of the output voltage, thereby dramatically reducing the inrush current. The 88PG82XX rise time is roughly 0.25V/ms and it is independent of output capacitance and load current (see Figure 8). Figure 9 shows the output voltage rise time with a 100 μF output capacitor. Although there is a difference in output capacitance between Figure 6 and Figure 9, the output voltage rise time difference is less than 0.1 ms.
Figure 5: Startup without Sequencing
Figure 6: Startup with Sequencing and Soft Start (COUT= 22 μF)
2V/DIV VEN 1V/DIV VOUT1 1V/DIV VOUT2 VOUT2 VOUT1 VIN
5V/DIV
1.0V/DIV
1V/DIV
1.0 ms/DIV
2.0 ms/DIV
Doc. No. MV-S103563-00 Rev. C Page 20 Document Classification: Proprietary Information
Copyright © 2008 Marvell April 23, 2008, 2.00
Functional Description
Regulation and Start-up
Figure 7: Fast Startup (0.8V, 1.2V, 1.8V, 2.5V, 3.3V)
Figure 8: Soft Start up (0.8V, 1.2V, 1.8V, 2.5V, 3.3V)
VOUT
500mV/DIV
VOUT
500mV/DIV
20 μs/DIV
2.0 ms/DIV
Figure 9: Inrush Current with COUT = 100 μF
500 mV/DIV VOUT
IIN
100 mA/DIV
5.0 ms/DIV
Copyright © 2008 Marvell April 23, 2008, 2.00 Document Classification: Proprietary Information
Doc. No. MV-S103563-00 Rev. C Page 21
88PG82XX Datasheet
3.2
3.2.1
Output Voltage Settings
Logic Programmability
The output voltage of the step-down switching regulator can be programmed by connecting VSET and PSET pins to SGND and/or SVIN. This can be very useful for standard output voltages.
Table 8:
V V S E T1 SGND SGND SVIN SVIN SGND
Logic Programmability Table
V PS E T 1 SGND SVIN SGND SVIN 11K≤RPSET2≤475K V OUT 1 1.8V 2.5V 3.0V 3.3V Hi-Z V V S E T2 SGND SGND SVIN SVIN SGND V P SE T 2 SGND SVIN SGND SVIN 11K≤RPSET2≤475K V O U T2 0.8V 1.0V 1.2V 1.5V Hi-Z
Doc. No. MV-S103563-00 Rev. C Page 22 Document Classification: Proprietary Information
Copyright © 2008 Marvell April 23, 2008, 2.00
Functional Description
Output Voltage Settings
3.2.2
Serial Programmability
The output voltage of the step-down switching regulator can also program by using 18-bit serial data into the SDI pin.
Figure 10: Serial Programmability
WRITE MODE
Start Chip Select Registor Address DATA FIELD Stop
"1" Pulse
"1" "0" "0" pulse Pulse pulse
"1" Pulse
"0" "0" "1" "0" pulse pulse Pulse pulse
"1" Pulse
The period of a pulse is 1 μ s +/- 200 ns VHIGH > 1.4V VLow < 0.8V
D7 BIT 7
D6 BIT 6
D5 BIT 5
D4 BIT 4
D3 BIT 3
D2 BIT 2
D1 BIT 1
D0 BIT 0
"1" pulse The write operation : 1) 2) 3) be Each write sequence needs 18 pulses to complete. During a non -write operation , the input needs to be at V LOW (
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