DSP Switcher™ 88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-
Down Switching Regulator Module with
AnyVoltage™ Technology
Advance Specifications, Patent Pending
Doc. No. MV-S104251-00, Rev. --
February 26, 2007
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88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00 Rev. -- Copyright@ 2007 Marvell
Page 2 Document Classification: Proprietary Information February 26, 2007, Advance
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. Contact Marvell Field Application Engineers for more information.
Revision Code: Rev. --
Advance Technical Publication: 0.01
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
88MG877-x Series
Copyright@ 2007 Marvell Doc. No. MV-S104251-00, Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 3
FEATURES/BENEFITS
•True lead-free “plug-n-play” solution
•No external components required - except a sin-
gle 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 Voltage™ Technology provides 72 output
selections and shortens design cycles
•Output voltage margining capability for easy sys-
tem 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 avail-
able for high volume user
SIP Package
DIP Package
SMT Package (TBD)
Doc. No. MV-S104251-00, Rev. -- Copyright@ 2007 Marvell
Page 4 Document Classification: Proprietary Information February 26, 2007, Advance
OVERVIEW
The 88MG877-x Series1 is a high-performance, non-
isolated, DC-DC converter module for point-of-load
(POL) applications. It functions as a synchronous step-
down (buck) switching regulator in a small form factor.
The module includes a proprietary Marvell® integrated
regulator device. The switching frequency for the regu-
lator 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).
Ultra-high conversion efficiency allows for the use of
the 88MG877-x Series without any heatsink. Addition-
ally, the 88MG877-x Series includes an innovative sin-
gle 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 -40°C to 85°C.
APPLICATIONS
•Point-of-load power supplies
•Networking/Datacom systems
•Portable computing
•Servers
•DSP power supplies
•LAN/WAN
1. The 88MG877-x Series includes 88MG877-S,
88MG877-D, and 88MG877-T.
2. Patent Pending
DEVICE FEATURE DIFFERENCES
The table below summarizes the feature differences between 88MG877.
Features 88MG877
Rated Output Current 5A
Packages •11-Pin SIP
•8-Pin DIP
•8-Pin SMT
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February 26, 2007, Advance Document Classification: Proprietary Information Page 5
Table 1: Product Selector Table
Part Name Description Output
Current
Package
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
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 6 Document Classification: Proprietary Information February 26, 2007, Advance
Table of Contents
SECTION 1. SIGNAL DESCRIPTION................................................................... 8
1.1 Pin Diagram.....................................................................................................................8
1.2 Pin Description .............................................................................................................10
SECTION 2. FUNCTIONAL DESCRIPTION ......................................................... 12
2.1 Regulation and Start-up...............................................................................................12
2.1.1 Digital Soft Start................................................................................................................ 13
2.1.2 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 Step-Down Regulator ....................................................................................................... 26
SECTION 5. TYPICAL CHARACTERISTICS........................................................ 27
5.1 Efficiency Graphs .........................................................................................................27
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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 Step-Down Regulator ....................................................................................................... 29
5.5 Temperature Graphs.................................................................................................... 31
5.5.1 Step-Down Regulator ....................................................................................................... 32
SECTION 6. MECHANICAL DRAWINGS ............................................................33
6.1 Mechanical Drawings for 88MG877-x......................................................................... 33
SECTION 7. ORDERING INFORMATION ............................................................36
7.1 Ordering Part Numbers and Package Markings ....................................................... 36
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 8 Document Classification: Proprietary Information February 26, 2007, Advance
Section 1. Signal Description
1.1 Pin Diagram
Figure 1: 88MG877-S Package - Component View
Figure 2: 88MG877-D Package - Component View
1345 867 10911
1: SDI 5: VIN 9: GND
2: MISSING PIN 6: PSET 10: VOUT
3: ENABLE 7: VSET 11: VOUT
4: POR 8: GND
2
88MG877-S
1
2
4
3
56
7
8
1: GND 5: SDI
2: PSET 6: VSET
3: VIN 7: POR
4: ENABLE 8: VOUT
88MG877-D
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Signal Description
Pin Diagram
Figure 3: 88MG877-T Package - Component View
Figure 4: Connection Block Configuration Sample for 88MG877-S
1: GND 5: SDI
2: PSET 6: VSET
3: VIN 7: POR
4: ENABLE 8: VOUT
1
2
3
4
5
6
7
8
88MG877-T
88MG877-S
VOUT
GND
VIN
EN
GND
3V-5.5V
VSET
PSET
Optional
Load
SDI
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 10 Document Classification: Proprietary Information February 26, 2007, Advance
1.2 Pin Description
Name Pin Description
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® 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.
Copyright © 2007 Marvell Doc. No. MV-S104251-00, Rev. --
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Signal Description
Pin Description
Table 2: Pin Number Assignment Table
Pin Name 88MG877-S 88MG877-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
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 12 Document Classification: Proprietary Information February 26, 2007, Advance
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 min-
imize 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 appli-
cations.
Figure 5: Output Voltage Window
Typical VOUT
PFM Mode
PWM Mode
PFM Mode
A
B
C
D
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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 µs at for a 0.8V output to 70 µs for a 3.3V output with a 20 mA load. Higher
load current or larger output capacitance will increase the rise time.
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.
VBUCK
Figure 6: Soft Startup
(0.8V, 1.2V, 1.8V, 2.5V, 3.3V)
500 mV/DIV
10 μs/DIV
ILOAD = 20 mA
COUT = 2 x 22 μF
Table 3: Output Voltage Setting
VVSET VPSET VOUT
SGND SGND 0.8V
SGND SVIN 1.0V
SVIN SGND 1.2V
SVIN SVIN 1.5V
SGND 11 kΩ < RPSET< 475 kΩHi-Z
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 14 Document Classification: Proprietary Information February 26, 2007, Advance
2.2 Output Voltage – AnyVoltageTM Technology
The output voltage of the step-down switching regulator is programmed by using Table 4 or Ta bl e 5 to select resis-
tor 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 kΩ resistor is selected for the VSET pin, and
an 11 kΩ resistor is selected for the PSET pin. The 165 kΩ resistor sets the output voltage to 2.5V and the 11 kΩ
resistor trims the set voltage by -10%.
Using the VSET resistor’s value greater than 619 kΩ or less than 7.68 kΩ disables the step-down switching regu-
lator 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 kΩ or less than 7.68 kΩ 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
PSET
-10.0% –7.5% –5.0% –2.5% 0% 2.5% 5.0% 7.5% 10.0%
11k 18.7k 31.6k 53.6k GND 97.6k 165k 280k 475k
VSET
11k 0.720 0.740 0.760 0.780 0.800 0.820 0.840 0.860 0.880
18.7k 0.900 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100
31.6k 1.080 1.110 1.140 1.170 1.200 1.230 1.260 1.290 1.320
53.6k 1.350 1.388 1.425 1.463 1.500 1.538 1.575 1.613 1.650
97.6k 1.620 1.665 1.710 1.755 1.800 1.845 1.890 1.935 1.980
165k 2.250 2.313 2.375 2.438 2.500 2.563 2.625 2.688 2.750
280k 2.700 2.775 2.850 2.925 3.000 3.075 3.150 3.225 3.300
475k 2.970 3.053 3.135 3.218 3.300 3.383 3.465 3.548 3.630
Copyright © 2007 Marvell Doc. No. MV-S104251-00, Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 15
Functional Description
Output Voltage – AnyVoltageTM Technology
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 volt-
age. 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 MΩ and the stray capacitance must be less than 25 pF; otherwise, a 3.3V out-
put can potentially end up at 3V.
Table 5: Any Voltage Programming Table for 5% Resistors
PSET
-10.0% –7.5% –5.0% –2.5% 0% 2.5% 5.0% 7.5% 10.0%
11k 18k 30k 51k GND 100k 160k 270k 470k
VSET
11k 0.720 0.740 0.760 0.780 0.800 0.820 0.840 0.860 0.880
18k 0.900 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100
30k 1.080 1.110 1.140 1.170 1.200 1.230 1.260 1.290 1.320
51k 1.350 1.388 1.425 1.463 1.500 1.538 1.575 1.613 1.650
100k 1.620 1.665 1.710 1.755 1.800 1.845 1.890 1.935 1.980
160k 2.250 2.313 2.375 2.438 2.500 2.563 2.625 2.688 2.750
270k 2.700 2.775 2.850 2.925 3.000 3.075 3.150 3.225 3.300
470k 2.970 3.053 3.135 3.218 3.300 3.383 3.465 3.548 3.630
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 16 Document Classification: Proprietary Information February 26, 2007, Advance
2.3 Output Voltage Margining
A useful application of the Marvell® Any Voltage™ 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 Ta bl e 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 Ta bl e 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 Tab le 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
88MG877-x
VOUT
Load
GND
VIN
EN
GND
3V-5.5V
VSET
PSET
R1
R2
S1S2
R3
SDI
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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 regu-
lator 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
VOVP_HTH
VUVLO_HTH
VUVLO_LTH
VOVP_LTH
Undefined
BUCK Output
Disable
BUCK Output
Enable
VIN
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 18 Document Classification: Proprietary Information February 26, 2007, Advance
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 µs (tDELAY) delay is incorporated to prevent nuisance tripping.
Figure 9: Power-On Reset Waveforms
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).
VPOR
0V
VPOR_H
VPOR_L
< t DELAY
> t DELAY
VPOR_TH
40 ms
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Functional Description
Thermal Derating
2.8 Thermal Derating
Figure 10: Thermal Derating Curve
Temperature Derating Curve
3
4
5
6
25 35 45 55 65 75 85
Temperature (°C)
Output Current (A)
Iout @Vin = 5.0V LFM=0
Iout @Vin = 3.3V LFM=0
Iout @Vin =5.0V LFM=50
Iout @Vin 3.3V LFM=100
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 20 Document Classification: Proprietary Information February 26, 2007, Advance
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.
Parameter Symbol Range Units
Input Voltage to GND VIN -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 5A
LDO Output Current (Peak) IOUT_LDO 450 mA
3.2 Recommended Operating Conditions1
1. This device is not guaranteed to function outside the specified operating range.
Parameter Symbol Range Units
Input Voltage VIN 3 to 5.5 V
Operating Temperature Range2
2. This device is guaranteed to meet the specifications from 0°C to 70°C. Any specifications that per-
tains to the operating temperature range -40°C to +85°C are assured by design, characterization,
and correlation with statistical process controls.
TOP -40 to +85 °C
Copyright © 2007 Marvell Doc. No. MV-S104251-00, Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 21
Electrical Specifications
Electrical Characteristics
3.3 Electrical Characteristics
The following applies unless otherwise noted: VIN = 5.0V. TA = 25°C. Bold values indicate -40°C ≤ TA ≤ 85°C.
Parameter Symbol Condition Min Typ Max Units
Input Voltage Range VIN 3.0 5.5 V
Total Quiescent Current (No
Load)
IIN 1.2 mA
Shutdown Supply Current IIN VSHDN = VIN = 5.5V 1 10 µA
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 VEN Enable regulator (5V) 3 V
Enable regulator (3.3V) 2.4 V
Disable regulator
(3.3V/5V)
0.8 V
Enable Pin Input Current IEN VEN = GND or 5.5V ±5 µA
Over-Temperature Thermal
Shutdown
TOTS TJ increasing (disable
regulator)
150 °C
TJ decreasing (enable
regulator)
120 °C
Switching
Frequency
fSW 1MHz
Output Voltage Tolerance Δ VOUT ±1 %
Line Regulation IOUT = 5A 0.2 %
VIN = 3.0V to 5.5V
Load Regulation VOUT = 1.5V
IOUT = 1.0A to 5.0A
0.5 %
Input Current Ripple IIN ripple VOUT = 0.8V
IOUT = 5A
(without external filter)
10.5 mA pk-pk
Input Voltage Ripple VIN ripple 50.0 mV pk-pk
Output Voltage Noise VIN = 5.0V
VOUT = 1.8V
IOUT = 5.0A
6.0 mV RMS
11.0 mV pk-pk
Electrical Material Rating
Flammability Rating UL94V-0
Material Type FR4-PCB
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00 Rev. -- Copyright © 2007 Marvell
Page 22 Document Classification: Proprietary Information February 26, 2007, Advance
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 step-
down regulator’s output voltage turns on.
VEN
VBUCK
VPOR
Figure 11: Startup Using the Enable
Pin
1V/DIV
1V/DIV
5V/DIV
VEN
VBUCK
VPOR
Figure 12: Turn Off Using the
Enable Pin
1V/DIV
1V/DIV
5V/DIV
10 ms/DIV 2.0 ms/DIV
VIN = 5.0V ILOAD = No Load VIN = 5.0V
VBUCK= 1.2V tDLY= 4.0 ms VBUCK= 1.2V
VIN
VBUCK
VPOR
Figure 13: Input Voltage Soft Start
2V/DIV
1V/DIV
5V/DIV
VIN
VBUCK
VPOR
Figure 14: Input Voltage Hot Plug
2V/DIV
1V/DIV
5V/DIV
10 ms/DIV 10 ms/DIV
VIN = 5.0V VBUCK= 1.2V VIN = 5.0V VBUCK= 1.2V
ILOAD = No Load ILOAD = No Load
Functional Characteristics
Start-up Waveforms
Copyright © 2007 Marvell Doc. No. MV-S104251-00 Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 23
VIN
VBUCK
Figure 15: UVLO and OVP Thresh-
olds
2V/DIV
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
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00 Rev. -- Copyright © 2007 Marvell
Page 24 Document Classification: Proprietary Information February 26, 2007, Advance
4.2 Short-Circuit Waveforms
VSW
VBUCK
IIND
Figure 16: Step-Down Short-Circuit
Response
5V/DIV
500 mV/DIV
5A/DIV
200 μs/DIV
Functional Characteristics
Switching Waveforms
Copyright © 2007 Marvell Doc. No. MV-S104251-00 Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 25
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 50Ω resistor.
VIN
VOUT
Figure 17: SIP Output Switching
Waveforms - PWM mode
100 mV/DIV
20 mV/DIV
VOUT
Figure 18: SIP Output Switching
Waveforms - PWM Mode
20 mV/DIV
500 ns/DIV 1.0 ms/DIV
VIN = 5.0V VOUT(P-P) = 10.1 mV VIN = 5.0V VOUT(P-P) = 11.4 mV
VOUT= 1.2V VIN(P-P) = 115 mV VOUT= 1.2V
IOUT = 5.0A IOUT = 5.0A
VIN
VOUT
Figure 19: SIP Output Switching
Waveforms - DCM Mode
100 mV/DIV
20 mV/DIV
VOUT
Figure 20: SIP Output Switching
Waveforms - DCM Mode
20 mV/DIV
5.0 μs/DIV 1.0 ms/DIV
VIN = 5.0V VOUT(P-P) = 38.8 mV VIN = 5.0V VOUT(P-P) = 38.8 mV
VOUT= 1.2V VIN(P-P) = 115 mV VOUT= 1.2V
IOUT = 100 mA IOUT = 100 mA
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00 Rev. -- Copyright © 2007 Marvell
Page 26 Document Classification: Proprietary Information February 26, 2007, Advance
4.4 Load Transient Waveforms
4.4.1 Step-Down Regulator
VBUCK
ILOAD
Figure 21: Load Transient Response
200 mV/DIV
5A/DIV
VBUCK
ILOAD
Figure 22: Double-Pulsed Load
Response
200 mV/DIV
5A/DIV
10 μs/DIV 20 μs/DIV
VIN = 5.0V ILOAD = 1A to 5A VIN = 5.0V ILOAD = 1A to 5A
VBUCK= 1.5V tRISE = 27 A/μsV
BUCK= 1.5V tRISE = 27 A/μs
tFALL = 190 A/μst
FALL = 190 A/μs
Typical Characteristics
Efficiency Graphs
Copyright © 2007 Marvell Doc. No. MV-S104251-00 Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 27
Section 5. Typical Characteristics
5.1 Efficiency Graphs
5.1.1 Efficiency Graphs in log scale
Efficiency vs. Output Current
Vin = 5.0V
50
60
70
80
90
100
012345
Output Current (A)
Efficiency (%)
3.3V
3.0V
2.5V
1.8V
1.5V
1.2V
1.0V
0.8V
G77 G
1
Efficiency vs. Output Current
Vin = 5.0V
50
60
70
80
90
100
0.01 0.1 1 10
Output Current (A)
Efficiency (%)
3.3V
3.0V
2.5V
1.8V
1.5V
1.2V
1.0V
0.8V
G77 G3
Efficiency vs. Output Current
Vin = 3.3V
50
60
70
80
90
100
012345
Output Current (A)
Efficiency (%)
2.5V
1.8V
1.5V
1.2V
1.0V
0.8V
G77 G2
Efficiency vs. Output Current
Vin = 3.3V
50
60
70
80
90
100
0.01 0.1 1 10
Output Current (A)
Efficiency (%)
1.8V
1.5V
1.2V
1.0V
0.8V
G77 G4
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00 Rev. -- Copyright © 2007 Marvell
Page 28 Document Classification: Proprietary Information February 26, 2007, Advance
5.2 Load Regulation
5.3 Dropout Voltage
Output Voltage vs. Output Current
Vout = 1.5V
1.40
1.45
1.50
1.55
1.60
012345
Output Current (A)
Output Voltage (V)
3.3V
5.0V
G77 G5
Step-Down Regulator
Dropout vs. Load Current
Vin = 3.2, Vout = 3.3V
0.000
0.050
0.100
0.150
0.200
012345
Output Current (A)
Buck Dropout (V)
85C
25C
-40C
G77 G6
Typical Characteristics
Input Voltage Graphs
Copyright © 2007 Marvell Doc. No. MV-S104251-00 Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 29
5.4 Input Voltage Graphs
5.4.1 Step-Down Regulator
Load = No Load VIN = 5.0V
Load = No Load
IOUT(BUCK) = 1.25A VOUT(BUCK) = 1.5V
IOUT(BUCK) = 2.5A
Supply Current vs. Input Voltage
0.0
0.5
1.0
1.5
2.0
3.03.54.04.55.05.5
Input Voltage (V)
Supply Current (mA)
G77 G1
7
Shutdow n Supply Current vs. Input Voltage
0.0
0.2
0.4
0.6
0.8
1.0
33.544.555.5
Input Voltage (V)
Shutdown Current (uA)
G77 G18
Shutdown Threshold vs. Input Voltage
1.0
1.5
2.0
2.5
3.0
3 3.5 4 4.5 5
Input Voltage (V)
Shutdown Treshold (V)
UTH - Disable
LTH - Enable
G77 G19
Output Voltage vs. Input Voltage
1.47
1.485
1.5
1.515
1.53
3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Output Voltage (V)
G77 G20
Efficiency vs. Input Voltage
80%
85%
90%
95%
100%
3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Efficiency
G77 G21
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00 Rev. -- Copyright © 2007 Marvell
Page 30 Document Classification: Proprietary Information February 26, 2007, Advance
VOUT(BUCK) = 1.5V
IOUT(BUCK) = 1.25A - 5.0A
Load Regulation vs. Input Voltage
-0.10%
0.00%
0.10%
0.20%
3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Load Regulation
G77 G22
Typical Characteristics
Temperature Graphs
Copyright © 2007 Marvell Doc. No. MV-S104251-00 Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 31
5.5 Temperature Graphs
IOUT(BUCK) = No Load
IOUT(LDO) = No Load
IOUT(BUCK) = 10 mA VIN= 5V
Supply Current vs. Temperature
0.0
0.5
1.0
1.5
2.0
-40 -20 0 20 40 60 80
Temperature (°C)
Supply Current (mA)
G77 G25
Shutdow n Supply Current vs.Temperature
0
1
2
3
-40-200 20406080
Temperature (°C)
Shutdown Current (uA)
G77 G2 6
UVLO vs. Temperature
2.6
2.7
2.8
2.9
3
-40-20 0 20406080
Temperature (°C)
UVLO (V)
HT H
LTH
G77 G27
Shutdown Threshold vs. Temperature
1.0
1.5
2.0
2.5
3.0
-40 -20 0 20 40 60 80
Temperature (°C)
Shutdown Treshold (V)
UTH - Dis able
LTH - Enable
G77 G28
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00 Rev. -- Copyright © 2007 Marvell
Page 32 Document Classification: Proprietary Information February 26, 2007, Advance
5.5.1 Step-Down Regulator
VIN = 5.0V
IOUT(LDO) = 1.2A
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
Output Voltage vs. Temperature
1.47
1.485
1.5
1.515
1.53
-40 -20 0 20 40 60 80
Temperature (°C)
Output Voltage (V)
G77 G29
Buck Load Regulation vs. Temperature
-0.20%
-0.10%
0.00%
0.10%
0.20%
-40-200 20406080
Temperature (°C)
Load Regulation
G77 G31
Buck Line Regulation vs. Temperature
-0.30%
-0.20%
-0.10%
0.00%
-40-20 0 20406080
Temperature (°C)
Line Regulation
G77 G32
Copyright © 2007 Marvell Doc. No. MV-S104251-00, Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 33
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)
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 34 Document Classification: Proprietary Information February 26, 2007, Advance
Figure 24: 88MG877-D Mechanical Dimensions (DIP Package)
Copyright © 2007 Marvell Doc. No. MV-S104251-00, Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 35
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"
88MG877-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S104251-00, Rev. -- Copyright © 2007 Marvell
Page 36 Document Classification: Proprietary Information February 26, 2007, Advance
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 vari-
ants are similar. For complete ordering information, contact your Marvell® FAE or sales representative.
Figure 26: 88MG877 Sample Ordering Part Number
88MG877
Part Number
-A0-x
Internal Marvell Code
Package Code
Copyright © 2007 Marvell Doc. No. MV-S104251-00, Rev. --
February 26, 2007, Advance Document Classification: Proprietary Information Page 37
Ordering Information
Ordering Part Numbers and Package Markings
The standard ordering part number for the respective solution is shown in Table 6.
Figure 27 shows a typical package marking and pin 1 location for the 88MG877 part. Markings for the other vari-
ants are similar.
Figure 27: 88MG877 Package Marking
Table 6: Ordering Part Numbers
Part Number Switcher
Output
Voltage
Rated
Output
Current
Ambient
Temperature
Range1
1. Any specifications that pertains to the operating temperature range -40°C to 85°C
are assured by design, characterization, and correlation with statistical process
controls.
Package
88MG877-S Programmable 5A -40°C to 85°C 11-pin SIP
88MG877-D Programmable 5A -40°C to 85°C8-pin DIP
88MG877-T Programmable 5A -40°C to 85°C8-pin SMT
G877-X
YWW$ Lot Code
Part Number
Package Code
Work week
Last digit of year
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