DSP SwitcherTM 88MG877-x Series 5A Rated Output Current, Non-Isolated, StepDown Switching Regulator Module with AnyVoltageTM Technology Advance Specifications, Patent Pending Doc. No. MV-S104251-00, Rev. -February 26, 2007 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Document Status Advance Information This document contains design specifications for initial product development. Specifications may change without notice. Contact Marvell Field Application Engineers for more information. Preliminary Information This document contains preliminary data, and a revision of this document will be published at a later date. Specifications may change without notice. Contact Marvell Field Application Engineers for more information. Final Information This document contains specifications on a product that is in final release. Specifications may change without notice. 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No. MV-S104251-00 Rev. -Page 2 Copyright@ 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology F EATURES /B ENEFITS * * SIP Package * * * * * * * * * * * DIP Package * * True lead-free "plug-n-play" solution No external components required - except a single voltage programming resistor Tiny SIP, DIP, and SMT packages available Input voltage range: 3V to 5.5V Programmable output voltage: 0.72V to 3.63V 1 MHz switching frequency 2% output voltage tolerance 95% efficiency Ultra-fast transient response Any VoltageTM Technology provides 72 output selections and shortens design cycles Output voltage margining capability for easy system testing and qualification High reliability - lowest component count Works with any external capacitive load (low ESR, high ESR) Built-in undervoltage lockout, thermal protection, current limit, and short circuit protection Control IC and passive kit components are available for high volume user SMT Package (TBD) Copyright@ 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 3 O VERVIEW A PPLICATIONS The 88MG877-x Series1 is a high-performance, nonisolated, DC-DC converter module for point-of-load (POL) applications. It functions as a synchronous stepdown (buck) switching regulator in a small form factor. The module includes a proprietary Marvell(R) integrated regulator device. The switching frequency for the regulator is 1 MHz, and no external components are required (except one voltage programming resistor, see Section 2.2 "Output Voltage - AnyVoltageTM Technology" on page 14). * * * * * * Point-of-load power supplies Networking/Datacom systems Portable computing Servers DSP power supplies LAN/WAN Ultra-high conversion efficiency allows for the use of the 88MG877-x Series without any heatsink. Additionally, the 88MG877-x Series includes an innovative single resistor method2 to program the output voltage. This voltage is defined by the user with an external resistor. The 88MG877-x Series operates from an input voltage range of 3V to 5.5V, making the device well suited for portable applications. The output voltage range is 0.72V to 3.63V, supporting future devices down to 65 nm geometries. Other key features include an internal current limit, an undervoltage lockout, a thermal shutdown, and an ambient temperature range of -40C to 85C. 1. The 88MG877-x Series includes 88MG877-S, 88MG877-D, and 88MG877-T. 2. Patent Pending D EVICE F EATURE D IFFERENCES The table below summarizes the feature differences between 88MG877. Fe atur es 88MG877 Rated Output Current 5A Packages * * * 11-Pin SIP 8-Pin DIP 8-Pin SMT Doc. No. MV-S104251-00, Rev. -Page 4 Copyright@ 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Table 1: Product Selector Table Part Name D e s c r i p ti o n O ut p ut Curre nt Pa ckag e 88MG877-S SIP Module: 5A Rated Output Current 5A 11-Pin SIP 88MG877-D DIP Module: 5A Rated Output Current 5A 8-Pin DIP 88MG877-T SMT Module: 5A Rated Output Current 5A 8-Pin SMT Copyright@ 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 5 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Table of Contents SECTION 1. SIGNAL DESCRIPTION ................................................................... 8 1.1 Pin Diagram.....................................................................................................................8 1.2 Pin Description .............................................................................................................10 SECTION 2. 2.1 FUNCTIONAL DESCRIPTION ......................................................... 12 Regulation and Start-up...............................................................................................12 2.1.1 2.1.2 Digital Soft Start................................................................................................................ 13 Logic Programmability ...................................................................................................... 13 2.2 Output Voltage - AnyVoltageTM Technology.............................................................14 2.3 Output Voltage Margining............................................................................................16 2.4 Undervoltage Lockout (UVLO) ....................................................................................17 2.5 Over Voltage Protection (OVP)....................................................................................17 2.6 Power-On Reset (POR).................................................................................................18 2.7 Thermal Shutdown .......................................................................................................18 2.8 Thermal Derating ..........................................................................................................19 SECTION 3. ELECTRICAL SPECIFICATIONS ..................................................... 20 3.1 Absolute Maximum Ratings ........................................................................................20 3.2 Recommended Operating Conditions ........................................................................20 3.3 Electrical Characteristics.............................................................................................21 SECTION 4. FUNCTIONAL CHARACTERISTICS ................................................. 22 4.1 Start-up Waveforms .....................................................................................................22 4.2 Short-Circuit Waveforms .............................................................................................24 4.3 Switching Waveforms ..................................................................................................25 4.4 Load Transient Waveforms .........................................................................................26 4.4.1 SECTION 5. 5.1 Step-Down Regulator ....................................................................................................... 26 TYPICAL CHARACTERISTICS........................................................ 27 Efficiency Graphs .........................................................................................................27 Doc. No. MV-S104251-00, Rev. -Page 6 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance 5.1.1 Efficiency Graphs in log scale .......................................................................................... 27 5.2 Load Regulation ........................................................................................................... 28 5.3 Dropout Voltage ........................................................................................................... 28 5.4 Input Voltage Graphs................................................................................................... 29 5.4.1 5.5 Step-Down Regulator ....................................................................................................... 29 Temperature Graphs.................................................................................................... 31 5.5.1 Step-Down Regulator ....................................................................................................... 32 SECTION 6. 6.1 Mechanical Drawings for 88MG877-x......................................................................... 33 SECTION 7. 7.1 MECHANICAL DRAWINGS ............................................................33 ORDERING INFORMATION ............................................................36 Ordering Part Numbers and Package Markings ....................................................... 36 Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 7 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Section 1. Signal Description 1.1 Pin Diagram Figure 1: 88MG877-S Package - Component View 88MG877-S 1 1: 2: 3: 4: 2 3 4 SDI MISSING PIN ENABLE POR 5 5: VIN 6: PSET 7: VSET 8: GND 6 7 8 9 10 11 9: GND 10: VOUT 11: VOUT Figure 2: 88MG877-D Package - Component View 8 1 2 7 3 4 5 1: GND 2: PSET 3: VIN 4: ENABLE 88MG877-D 6 5: SDI 6: VSET 7: POR 8: VOUT Doc. No. MV-S104251-00, Rev. -Page 8 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Signal Description Pin Diagram Figure 3: 88MG877-T Package - Component View 8 1 2 7 3 4 88MG877-T 5 1: GND 2: PSET 3: VIN 4: ENABLE 6 5: SDI 6: VSET 7: POR 8: VOUT Figure 4: Connection Block Configuration Sample for 88MG877-S Optional SDI EN VIN GND VOUT VSET GND PSET 88MG877-S Load 3V-5.5V Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 9 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology 1.2 Pin Description N am e Pi n D e scr ip t io n VSET Voltage Set 1) This is used for selecting the output voltage level, when it is connected to SGND or SVIN in conjunction with PSET connection to SGND or SVIN. See Section 2.1.2 "Logic Programmability" on page 13. 2) Connect to an external resistor to ground to set the output voltage of the step-down switching regulator. See the "Electrical Characteristics" table for resistor values and Output Voltage Setting section. The total capacitance across this pin and SGND should be equal to 25 pF or less. Use resistors with tolerance of 5% or better. EN Enable. CMOS logic level with 200 mV hysteresis. A logic high enables the regulator and a logic low disables the regulator. GND Power ground. Connect this pin to a suitable low-impedance ground plane. VOUT Output voltage. Connect directly to load with a short wide PCB trace. VIN 3V - 5.5V Input voltage. SDI Serial Data Input. This pin is a special function pin. Contact your Marvell(R) representative for information otherwise this pin should be left floating. POR Power-On Reset. Power-On Reset 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. PSET Percent Set 1) This is used for selecting the output voltage level when it is connected to SGND or SVIN in conjunction with VSET connection to SGND or SVIN. See Section 2.1.2 "Logic Programmability" on page 13. 2) Connect an external resistor to ground to set the output voltage of the step-down switching regulator. See the "Electrical Characteristics" table for resistor values and Output Voltage Setting section. Use resistor value with tolerance of 5% or better. Doc. No. MV-S104251-00, Rev. -Page 10 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Signal Description Pin Description Table 2: Pin Number Assignment Table Pin Name 88MG877 -S 88 MG877 -D/T SDI 1 5 GND 8, 9 1 MISSING PIN 2 - VSET 7 6 VOUT 10, 11 8 VIN 5 3 ENABLE 3 4 POR 4 7 PSET 6 2 Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 11 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Section 2. Functional Description 2.1 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 in Figure 5) 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 in Figure 5) 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. Figure 5: Output Voltage Window Typical VOUT A B C D Doc. No. MV-S104251-00, Rev. -Page 12 PFM Mode PWM Mode PFM Mode Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Functional Description Regulation and Start-up 2.1.1 Digital Soft Start During start-up, the 88MG877-x Series provides a soft start function. Soft start reduces surge currents from input voltage and provides well-controlled output voltage rise characteristics. Figure 6 shows that the rise time for a 88MG877-x Series increases from 20 s at for a 0.8V output to 70 s for a 3.3V output with a 20 mA load. Higher load current or larger output capacitance will increase the rise time. Figure 6: Soft Startup (0.8V, 1.2V, 1.8V, 2.5V, 3.3V) VBUCK 500 mV/DIV 10 s/DIV ILOAD = 20 mA COUT = 2 x 22 F 2.1.2 Logic Programmability The output voltage of the step-down switching regulator can be programmed by connecting the VSET and PSET pins to SGND and/or SVIN. This can be very useful for standard output voltages. This method will eliminate the use of an external resistor to set the output voltage. Table 3: Output Voltage Setting V VSET V PSET V OUT SGND SGND 0.8V SGND SVIN 1.0V SVIN SGND 1.2V SVIN SVIN 1.5V SGND 11 k < RPSET< 475 k Hi-Z Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 13 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology 2.2 Output Voltage - AnyVoltageTM Technology The output voltage of the step-down switching regulator is programmed by using Table 4 or Table 5 to select resistor values for VSET and PSET pin. The VSET pin sets the output voltage and the PSET pin trims the set voltage to a percentage value. For example, to program 2.25V output, a 165 k resistor is selected for the VSET pin, and an 11 k resistor is selected for the PSET pin. The 165 k resistor sets the output voltage to 2.5V and the 11 k resistor trims the set voltage by -10%. Using the VSET resistor's value greater than 619 k or less than 7.68 k disables the step-down switching regulator and sets the SW pin to high impedance. If the VSET resistor's value is outside the 5% tolerance, the output can be either higher or lower than the set voltage. Using resistor values greater than 619 k or less than 7.68 k for the PSET pin does not affect the set voltage. When the PSET pin is not used, it must be connected to ground. Like the VSET resistor, the percent value can be either higher or lower if the PSET resistor's value is outside the 5% tolerance. Table 4: Any Voltage Programming Table for 1% Resistors VSET PSET -10.0% -7.5% -5.0% -2.5% 0% 2.5% 5 .0 % 7.5% 10 .0 % 11k 18.7k 3 1.6k 53.6k GND 9 7.6k 165k 280 k 47 5k 11k 0.720 0.740 0.760 0.780 0.800 0.820 0.840 0.860 0.880 18 .7 k 0.900 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100 31 .6 k 1.080 1.110 1.140 1.170 1.200 1.230 1.260 1.290 1.320 53 .6 k 1.350 1.388 1.425 1.463 1.500 1.538 1.575 1.613 1.650 97 .6 k 1.620 1.665 1.710 1.755 1.800 1.845 1.890 1.935 1.980 16 5k 2.250 2.313 2.375 2.438 2.500 2.563 2.625 2.688 2.750 28 0k 2.700 2.775 2.850 2.925 3.000 3.075 3.150 3.225 3.300 47 5k 2.970 3.053 3.135 3.218 3.300 3.383 3.465 3.548 3.630 Doc. No. MV-S104251-00, Rev. -Page 14 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Functional Description Output Voltage - AnyVoltageTM Technology Table 5: Any Voltage Programming Table for 5% Resistors VSET PSET -10.0% -7.5% -5.0% -2.5% 0% 2. 5% 5. 0% 7.5% 1 0. 0% 11k 18k 3 0k 51 k GND 1 00k 160 k 27 0k 4 70k 11 k 0.720 0.740 0.760 0.780 0.800 0.820 0.840 0.860 0.880 1 8k 0.900 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100 3 0k 1.080 1.110 1.140 1.170 1.200 1.230 1.260 1.290 1.320 5 1k 1.350 1.388 1.425 1.463 1.500 1.538 1.575 1.613 1.650 1 00k 1.620 1.665 1.710 1.755 1.800 1.845 1.890 1.935 1.980 1 60k 2.250 2.313 2.375 2.438 2.500 2.563 2.625 2.688 2.750 2 70k 2.700 2.775 2.850 2.925 3.000 3.075 3.150 3.225 3.300 4 70k 2.970 3.053 3.135 3.218 3.300 3.383 3.465 3.548 3.630 The VSET and PSET resistors are read once during start-up before the output voltage is turned on. To configure the output to a different voltage, power has to recycle or the 88MG877-x Series has to turn OFF and back ON using the EN pin. The 88MG877-x Series provides an innovative technique to set the output voltage. During start-up it reads the value of external resistors, which are located outside the regulator's feedback loop to program the output voltage. By placing the output voltage programming resistor outside the regulator's feedback loop, its tolerance does not affect the accuracy of the output voltage. Normally, adjustable regulators use 1% resistors to set the output voltage. However, these resistors are located inside the feedback loop, introducing as much as 2% of initial accuracy error to the output voltage, resulting in an overall initial accuracy of 3%. Whereas, the 88MG877-x Series initial accuracy is 2% for any of the eight output voltages. The VSET and PSET pins are sensitive to excessive leakage currents and stray capacitance. The output voltage can potentially be programmed to the lower output voltage if there is contamination, which introduces excessive leakage current on the VSET and PSET pin, especially for the 3.3V output or +10%. The parasitic resistance on these nodes must be greater than 3 M and the stray capacitance must be less than 25 pF; otherwise, a 3.3V output can potentially end up at 3V. Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 15 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology 2.3 Output Voltage Margining A useful application of the Marvell(R) Any VoltageTM technology is "output voltage margining". Voltage margining is commonly used during system qualification to evaluate operation at "corner" conditions of voltage, temperature etc. Typically, output voltage will be offset up and down by some percentage (margin) of the nominal value. For the 88MG877-x Series, the VSET pin/resistor controls the nominal voltage of the switching regulator output while the PSET pin/resistor controls the margin voltage. As can be seen in Table 4, the PSET pin allows the margin to be set as high as 10% above and as low as -10% below the nominal setpoint established by VSET. Depending on the value of the PSET resistor intermediate points of 7.5%, 5% and 2.5% can also be accessed. For example, if an application calls for a nominal output voltage of 1.5V then Table 4 prescribes a value of R1 for the VSET resistor. This selection is shown in Figure 7 connected to the VSET pin. To offset the voltage above and below the nominal value, the PSET pin can be used with resistor values again from Table 4. Additionally, switches S1 and S2 can be alternately closed to select from the two resistors R3 and R2 (offset values) for PSET. If more offsets are required more switches and resistors may be used. As shown in Figure 7, if S1 is closed and S2 opened a positive 5% offset would be added to the nominal 1.5V output yielding 1.575V. Conversely, if S1 is opened and S2 closed the output would be offset to -5% from 1.5V, or 1.425V. Finally with both S1 and S2 opened the output would return to the nominal 1.5V. Thus voltage margining can be simply and reliably implemented with a minimum of components and design effort. Figure 7: Output Voltage Margining EN SDI VIN GND GND VSET VOUT PSET 88MG877-x Load R3 R2 S2 S1 3V-5.5V R1 Doc. No. MV-S104251-00, Rev. -Page 16 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Functional Description Undervoltage Lockout (UVLO) 2.4 Undervoltage Lockout (UVLO) At start-up, the 88MG877-x Series incorporates undervoltage-lockout circuitry to enable the step-down switching regulator when the input voltage is above 2.85V (typical). After the 88MG877-x Series is enabled and the input voltage is lowered, the highest value of the minimum input voltage for both regulators to remain enabled is 2.65V (typical). 2.5 Over Voltage Protection (OVP) The 88MG877-x Series incorporates an over voltage protection circuitry to disable the step-down switching regulator when the input voltage is above 5.7V (typical). The step-down switching regulator is enabled when the input voltage is below 5.6V (typical). Figure 8: UVLO and OVP Waveforms V OVP_HTH VOVP_LTH V UVLO_HTH V UVLO_LTH VIN BUCK Output Enable Undefined BUCK Output Disable Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 17 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology 2.6 Power-On Reset (POR) The Power-On Reset (POR) pin is an active-high, open-drain output pin. This output is held low when the output voltage of the step-down regulator is below the threshold. When the output voltage is above the threshold, the Power-On Reset pin goes high 40 ms later. Setting the output voltage greater than 1.35V, the threshold voltage is 0.9% * VOUT (typical). Setting the output voltage less than 1.32V, the threshold voltage is VOUT - 130 mV (typical). A built-in 25 s (tDELAY) delay is incorporated to prevent nuisance tripping. Figure 9: Power-On Reset Waveforms V POR_TH <t DELAY 0V V POR >t DELAY V POR_H V POR_L 40 ms 2.7 Thermal Shutdown When the junction temperature of the 88MG877-x Series exceeds 150 C (typical), the thermal shutdown circuitry disables the step-down regulator. The step-down switching regulator is enabled when the junction temperature is decreased to 120 C (typical). Doc. No. MV-S104251-00, Rev. -Page 18 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Functional Description Thermal Derating 2.8 Thermal Derating Figure 10: Thermal Derating Curve Temperature Derating Curve Output Current (A) 6 5 Iout @Vin = 5.0V LFM=0 4 Iout @Vin = 3.3V LFM=0 Iout @Vin =5.0V LFM=50 Iout @Vin 3.3V LFM=100 3 25 35 45 55 65 75 85 Temperature (C) Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 19 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Section 3. Electrical Specifications 3.1 Absolute Maximum Ratings Stresses above those listed in Absolute Maximum Ratings may cause permanent device failure. Functionality at or above those limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. Para meter Symbol Input Voltage to GND VIN R ange Units -0.3 to 6.0 V Voltage Set to GND VSET -0.3 to (VIN + 0.3) V Percentage Set Voltage to GND VPSET -0.3 to (VIN + 0.3) V Shutdown Voltage to GND VSHDN -0.3 to (VIN + 0.3V) V Storage Temperature Range TSTOR -65 to +150 C Peak Switch Current IPEAK 7.5 A Rated Output Current IOUT 5 A LDO Output Current (Peak) IOUT_LDO 450 mA 3.2 Recommended Operating Conditions1 Param eter Sym bo l R ang e Units Input Voltage VIN 3 to 5.5 V Operating Temperature Range2 TOP -40 to +85 C 1. This device is not guaranteed to function outside the specified operating range. 2. This device is guaranteed to meet the specifications from 0C to 70C. Any specifications that pertains to the operating temperature range -40C to +85C are assured by design, characterization, and correlation with statistical process controls. Doc. No. MV-S104251-00, Rev. -Page 20 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Electrical Specifications Electrical Characteristics 3.3 Electrical Characteristics The following applies unless otherwise noted: VIN = 5.0V. TA = 25C. Bold values indicate -40C TA 85C. Pa rame ter Sy mbo l Input Voltage Range VIN Total Quiescent Current (No Load) IIN Shutdown Supply Current IIN VSHDN = VIN = 5.5V 1 10 A Undervoltage Lockout VUVLO High threshold, VIN increasing 2.85 3.00 V Low threshold, VIN decreasing 2.65 2.75 V Enable Input Voltage Logic Con di tion Min Typ 3.0 Max Units 5.5 V 1.2 VEN Enable regulator (5V) Enable regulator (3.3V) mA 3 V 2.4 V Disable regulator (3.3V/5V) 0.8 V 5 A Enable Pin Input Current IEN VEN = GND or 5.5V Over-Temperature Thermal Shutdown TOTS TJ increasing (disable regulator) 150 C TJ decreasing (enable regulator) 120 C Switching Frequency fSW 1 MHz Output Voltage Tolerance VOUT 1 % 0.2 % VOUT = 1.5V IOUT = 1.0A to 5.0A 0.5 % VOUT = 0.8V IOUT = 5A (without external filter) 10.5 mA pk-pk 50.0 mV pk-pk VIN = 5.0V VOUT = 1.8V IOUT = 5.0A 6.0 mV RMS 11.0 mV pk-pk Line Regulation IOUT = 5A VIN = 3.0V to 5.5V Load Regulation Input Current Ripple IIN ripple Input Voltage Ripple VIN ripple Output Voltage Noise Electr ical Material Rating Flammability Rating UL94V-0 Material Type FR4-PCB Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 21 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Section 4. Functional Characteristics 4.1 Start-up Waveforms NOTE: When the input voltage rises above the UVLO's upper threshold, then there is a delay (4 ms typ) before the stepdown regulator's output voltage turns on. Figure 11: Startup Using the Enable Pin VEN Figure 12: Turn Off Using the Enable Pin 1V/DIV VEN 1V/DIV VBUCK VBUCK 1V/DIV VPOR 5V/DIV 1V/DIV VPOR 5V/DIV 2.0 ms/DIV 10 ms/DIV VIN = 5.0V ILOAD = No Load VIN = 5.0V VBUCK= 1.2V tDLY= 4.0 ms VBUCK= 1.2V Figure 13: Input Voltage Soft Start Figure 14: Input Voltage Hot Plug 2V/DIV VIN VIN 2V/DIV 1V/DIV VBUCK 1V/DIV VBUCK VPOR 5V/DIV VPOR 5V/DIV 10 ms/DIV 10 ms/DIV VIN = 5.0V VBUCK= 1.2V VIN = 5.0V ILOAD = No Load Doc. No. MV-S104251-00 Rev. -Page 22 VBUCK= 1.2V ILOAD = No Load Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Functional Characteristics Start-up Waveforms Figure 15: UVLO and OVP Thresholds VIN 2V/DIV VBUCK 1V/DIV 100 ms/DIV VIN = 0 to 6.0V VUVLO(HTH) = 2.93V VBUCK= 1.5V VUVLO(LTH)= 2.87V ILOAD(BUCK) = 1A VOVP(HTH) = 5.74V VOVP(LTH) = 5.53V Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00 Rev. -Document Classification: Proprietary Information Page 23 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology 4.2 Short-Circuit Waveforms Figure 16: Step-Down Short-Circuit Response VSW 5V/DIV 500 mV/DIV VBUCK IIND 5A/DIV 200 s/DIV Doc. No. MV-S104251-00 Rev. -Page 24 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Functional Characteristics Switching Waveforms 4.3 Switching Waveforms For repeatability of measuring output ripple VOUT(P-P) for the Buck regulator, the standard test procedure limits the scope bandwidth to 20 MHz and uses a coaxial cable with very short leads terminated into a 50 resistor. Figure 17: SIP Output Switching Waveforms - PWM mode VIN Figure 18: SIP Output Switching Waveforms - PWM Mode 100 mV/DIV 20 mV/DIV VOUT VOUT 20 mV/DIV 500 ns/DIV 1.0 ms/DIV VIN = 5.0V VOUT(P-P) = 10.1 mV VIN = 5.0V VOUT= 1.2V VIN(P-P) = 115 mV VOUT= 1.2V IOUT = 5.0A VOUT(P-P) = 11.4 mV IOUT = 5.0A Figure 19: SIP Output Switching Waveforms - DCM Mode Figure 20: SIP Output Switching Waveforms - DCM Mode 100 mV/DIV VIN VOUT 20 mV/DIV 20 mV/DIV VOUT 5.0 s/DIV 1.0 ms/DIV VIN = 5.0V VOUT(P-P) = 38.8 mV VIN = 5.0V VOUT= 1.2V VIN(P-P) = 115 mV VOUT= 1.2V IOUT = 100 mA IOUT = 100 mA Copyright (c) 2007 Marvell February 26, 2007, Advance VOUT(P-P) = 38.8 mV Doc. No. MV-S104251-00 Rev. -Document Classification: Proprietary Information Page 25 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology 4.4 Load Transient Waveforms 4.4.1 Step-Down Regulator Figure 21: Load Transient Response VBUCK Figure 22: Double-Pulsed Load Response 200 mV/DIV 200 mV/DIV VBUCK ILOAD 5A/DIV 5A/DIV ILOAD 10 s/DIV 20 s/DIV VIN = 5.0V ILOAD = 1A to 5A VIN = 5.0V ILOAD = 1A to 5A VBUCK= 1.5V tRISE = 27 A/s VBUCK= 1.5V tRISE = 27 A/s tFALL = 190 A/s Doc. No. MV-S104251-00 Rev. -Page 26 tFALL = 190 A/s Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Typical Characteristics Efficiency Graphs Section 5. Typical Characteristics 5.1 Efficiency Graphs Efficiency vs. Output Current Vin = 5.0V 100 90 90 Efficiency (%) Efficiency (%) Efficiency vs. Output Current Vin = 5.0V 100 80 3.3V 3.0V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V 70 60 50 0 1 2 3 4 Output Current (A) 80 3.3V 3.0V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V 70 60 5 50 0.01 0.1 1 Output Current (A) G77 G1 10 G77 G3 5.1.1 Efficiency Graphs in log scale Efficiency vs. Output Current Vin = 3.3V Efficiency vs. Output Current Vin = 3.3V 100 100 90 Efficiency (%) Efficiency (%) 90 80 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V 70 60 1 2 1.8V 1.2V 1.0V 0.8V 3 Output Current (A) 4 5 50 0.01 G77 G2 Copyright (c) 2007 Marvell February 26, 2007, Advance 1.5V 70 60 50 0 80 0.1 Output Current (A) 1 10 G77 G4 Doc. No. MV-S104251-00 Rev. -Document Classification: Proprietary Information Page 27 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology 5.2 Load Regulation Output Voltage vs. Output Current Vout = 1.5V Output Voltage (V) 1.60 1.55 1.50 1.45 3.3V 5.0V 1.40 0 1 2 3 Output Current (A) 4 5 G77 G5 5.3 Dropout Voltage Step-Down Regulator Dropout vs. Load Current Vin = 3.2, Vout = 3.3V 0.200 85C 25C Buck Dropout (V) 0.150 -40C 0.100 0.050 0.000 0 1 2 3 Output Current (A) 4 5 G77 G6 Doc. No. MV-S104251-00 Rev. -Page 28 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Typical Characteristics Input Voltage Graphs 5.4 Input Voltage Graphs Shutdow n Supply Current vs. Input Voltage Supply Current vs. Input Voltage 1.0 Shutdown Current (uA) Supply Current (mA) 2.0 1.5 1.0 0.5 0.0 0.8 0.6 0.4 0.2 0.0 3.0 3.5 4.0 4.5 5.0 3 5.5 3.5 4 Input Voltage (V) 4.5 5 Input Voltage (V) G77 G17 Load = No Load 5.5 G77 G18 VIN = 5.0V Load = No Load Shutdown Threshold vs. Input Voltage 3.0 Shutdown Treshold (V) UTH - Disable LTH - Enable 2.5 2.0 1.5 1.0 3 3.5 4 4.5 5 Input Voltage (V) G77 G19 5.4.1 Step-Down Regulator Efficiency vs. Input Voltage 100% 1.515 95% Efficiency Output Voltage (V) Output Voltage vs. Input Voltage 1.53 1.5 90% 85% 1.485 80% 1.47 3.0 3.5 4.0 4.5 5.0 5.5 3.0 3.5 4.0 5.0 5.5 G77 G21 G77 G20 IOUT(BUCK) = 1.25A 4.5 Input Voltage (V) Input Voltage (V) VOUT(BUCK) = 1.5V IOUT(BUCK) = 2.5A Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00 Rev. -Document Classification: Proprietary Information Page 29 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Load Regulation vs. Input Voltage Load Regulation 0.20% 0.10% 0.00% -0.10% 3.0 3.5 4.0 4.5 Input Voltage (V) 5.0 5.5 G77 G22 VOUT(BUCK) = 1.5V IOUT(BUCK) = 1.25A - 5.0A Doc. No. MV-S104251-00 Rev. -Page 30 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Typical Characteristics Temperature Graphs 5.5 Temperature Graphs Shutdow n Supply Current vs.Temperature Supply Current vs. Temperature 3 Shutdown Current (uA) Supply Current (mA) 2.0 1.5 1.0 0.5 0.0 -40 -20 0 20 40 60 Temperature (C) 2 1 0 -40 80 -20 0 20 40 60 80 Temperature (C) G77 G25 G77 G26 IOUT(BUCK) = No Load IOUT(LDO) = No Load UVLO vs. Temperature Shutdown Threshold vs. Temperature 3 Shutdown Treshold (V) 3.0 UVLO (V) 2.9 2.8 HTH 2.7 LTH 2.6 -40 -20 0 20 40 60 80 2.5 2.0 UTH - Disable 1.5 LTH - Enable 1.0 -40 Temperature (C) IOUT(BUCK) = 10 mA 0 20 40 60 80 G77 G28 VIN= 5V Copyright (c) 2007 Marvell February 26, 2007, Advance -20 Temperature (C) G77 G27 Doc. No. MV-S104251-00 Rev. -Document Classification: Proprietary Information Page 31 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology 5.5.1 Step-Down Regulator Output Voltage vs. Temperature Output Voltage (V) 1.53 1.515 1.5 1.485 1.47 -40 -20 0 20 40 60 80 Temperature (C) G77 G29 VIN = 5.0V IOUT(LDO) = 1.2A Buck Line Regulation vs. Temperature Buck Load Regulation vs. Temperature 0.20% 0.00% Line Regulation Load Regulation 0.10% 0.00% -0.10% -0.20% -0.10% -0.30% -0.20% -40 -20 0 20 40 60 80 -40 -20 G77 G31 20 40 60 80 G77 G32 VIN = 5.0V VIN = 3.0V - 5.0V VOUT(BUCK) = 1.5V VOUT(BUCK) = 1.5V IOUT(BUCK) = 1.25A - 5A IOUT(BUCK) = 2.5A Doc. No. MV-S104251-00 Rev. -Page 32 0 Temperature (C) Temperature (C) Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Mechanical Drawings Mechanical Drawings for 88MG877-x Section 6. Mechanical Drawings 6.1 Mechanical Drawings for 88MG877-x Figure 23: 88MG877-S Mechanical Dimensions (SIP Package) Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 33 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Figure 24: 88MG877-D Mechanical Dimensions (DIP Package) Doc. No. MV-S104251-00, Rev. -Page 34 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Mechanical Drawings Mechanical Drawings for 88MG877-x Figure 25: 88MG877-T Mechanical Dimensions (SMT Package) Note Refer to the following application note for SMT assembly instructions: "Recommended Soldering Guidelines for Power Modules in LGA Package - Specifications\MV-S300918-00.pdf" Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 35 88MG877-x Series 5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator Module with AnyVoltageTM Technology Section 7. Ordering Information 7.1 Ordering Part Numbers and Package Markings Figure 26 shows the typical ordering part numbering scheme for the 88MG877-x part. Markings for the other variants are similar. For complete ordering information, contact your Marvell(R) FAE or sales representative. Figure 26: 88MG877 Sample Ordering Part Number 88MG877-A0-x Package Code Part Number Internal Marvell Code Doc. No. MV-S104251-00, Rev. -Page 36 Copyright (c) 2007 Marvell Document Classification: Proprietary Information February 26, 2007, Advance Ordering Information Ordering Part Numbers and Package Markings The standard ordering part number for the respective solution is shown in Table 6. Table 6: Ordering Part Numbers P art Nu mbe r S w i tc he r O u tp ut Vo ltag e Rated Ou tpu t Cur rent Ambie nt Tem per atur e Range 1 Packa ge 88MG877-S Programmable 5A -40C to 85C 11-pin SIP 88MG877-D Programmable 5A -40C to 85C 8-pin DIP 88MG877-T Programmable 5A -40C to 85C 8-pin SMT 1. Any specifications that pertains to the operating temperature range -40C to 85C are assured by design, characterization, and correlation with statistical process controls. Figure 27 shows a typical package marking and pin 1 location for the 88MG877 part. Markings for the other variants are similar. Figure 27: 88MG877 Package Marking Package Code G877-X Part Number YWW$ Lot Code Work week Last digit of year Copyright (c) 2007 Marvell February 26, 2007, Advance Doc. No. MV-S104251-00, Rev. -Document Classification: Proprietary Information Page 37 Marvell Semiconductor, Inc. 5488 Marvell Lane Santa Clara, CA 95054, USA Tel: 1.408.222.2500 Fax: 1.408.752.9028 www.marvell.com Worldwide Corporate Offices Worldwide Sales Offices Marvell Semiconductor, Inc. 5488 Marvell Lane Santa Clara, CA 95054, USA Tel: 1.408.222.2500 Western US Marvell 5488 Marvell Lane Santa Clara, CA 95054, USA Tel: 1.408.222.2500 Fax: 1.408.752.9028 Sales Fax: 1.408.752.9029 Marvell Asia Pte, Ltd. 151 Lorong Chuan, #02-05 New Tech Park, Singapore 556741 Tel: 65.6756.1600 Fax: 65.6756.7600 Marvell Japan K.K. Shinjuku Center Bldg. 44F 1-25-1, Nishi-Shinjuku, Shinjuku-ku Tokyo 163-0644, Japan Tel: 81.(0).3.5324.0355 Fax: 81.(0).3.5324.0354 Marvell Semiconductor Israel, Ltd. 6 Hamada Street Mordot HaCarmel Industrial Park Yokneam 20692, Israel Tel: 972.(0).4.909.1500 Fax: 972.(0).4.909.1501 Marvell Semiconductor Korea, Ltd. 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