DSP Switcher™ 88MG875z-x/
88MG876-x Series
5A Rated Output Current, Non-Isolated, Step-
Down Switching Regulator Module with AnyVolt-
age™ Technology
Advance Specifications, Patent Pendin g
Doc. No. MV-S102822-00, Rev. B
April 4, 2006
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88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV-S102822-00 Rev. B Copyright@ 2006 Marvell
Page 2 Document Classification: Proprietary Information April 4, 2006, Advance
Document Status
Advance
Information This document contains design specifications for initial product development. S pecifications 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 Applicatio n Engineers for more information.
Revision Code: Rev. B
Advance Technical Publicati on: 0.61
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
88MG875z-x/88MG876-x Series
Copyright@ 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, 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
•2.5V and 3.3V LDO Secondary voltage versions
•Ultra-fast transient respo nse
•Any Voltage™ Technology provides 72 output
selections and shortens design cycles
•Output voltage margining capability for easy sys-
tem testing and qual ification
•High reliability - lowest component count
•Works with any external capacitive load (low
ESR, high ESR)
•Built-in undervoltage lockout, thermal protection,
and current limit
•Control IC and passive kit components are avail-
able for high volume user
SIP Package
DIP Package
SMT Package (TBD)
Doc. No. MV -S102822-00, Rev. B Copyright@ 2006 Marvell
Page 4 Document Classification: Proprietary Information April 4, 2006, Advance
OVERVIEW
The 88MG875z-x/88MG876-x Series1 is a high-perfor-
mance, non-isolated, DC-DC converter modu le for
point-of-load (POL) applications. It functions as a syn-
chronous step-down (buck) switching regulator in a
small form factor. The module includes a proprietary
Marvell® integrated regulator device. The switching
frequency for the regulato r is 1 MHz, an d no external
components are required (except one voltage pro-
gramming resistor, see Section 2.1 "Output Voltage -
Any Voltage™ Technology" on page 13).
Ultra-high conversion efficiency (typically 95%) allows
for the use of the 88MG875z-x/88MG876-x Series
without any heatsink. Additionally, the 88MG875z-x/
88MG876-x Series includes an innovative single resis-
tor method2 to program the output voltage. This volt-
age is defined by the user with an external resistor.
The 88MG875z-x/88MG876-x Series operates from an
input voltage range of 3V to 5.5V, making the device
well suited for portable applications. The output volt-
age range is 0.72V to 3.63V, supporting future devices
down to 65 nm geometries.
Other key features include an inte rnal 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 88MG875z-x/88MG876-x series includes
88MG75z-S, 88MG875z- D, 88MG875z-T, 88MG876-S,
88MG876-D, and 88MG876-T.
2. Patent Pending
DEVICE FEATURE DIFFERENCES
The table below summarizes the featu r e differences betwe en 88MG875z, and 88MG876
Features 88MG875z 88MG876
Rated Output Current 5A 5A
Packages •12-Pin SIP
•9-Pin DIP
•9-Pin SMT
•11-Pin SIP
•8-Pin DIP
•8-Pin SMT
LDO LDO Voltage Option No LDO
Copyright@ 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 5
Table 1: Product Selector Table
Part Name Description LDO
Output
Voltage
Output
Current Package
88MG875B-S SIP Module: 5A Rated Output Current with LDO 3.3V 5A 12-Pin SIP
88MG875B-D DIP Module: 5A Rated Output Current with LDO 3.3V 5A 9-Pin DIP
88MG875B-T SMT Module: 5A Rated Output Current with LDO 3.3V 5A 9-Pin SMT
88MG875E-S SIP Module: 5A Rated Output Current with LDO 2.5V 5A 12-Pin SIP
88MG875E-D DIP Module: 5A Rated Output Current with LDO 2.5V 5A 9-Pin DIP
88MG875E-T SMT Module: 5A Rated Output Current with LDO 2.5V 5A 9-Pin SMT
88MG876-S SIP Module: 5A Rated Output Current -- 5A 11-Pin SIP
88MG876-D DIP Module: 5A Rated Output Current -- 5A 8-Pin DIP
88MG876-T SMT Module: 5A Rated Output Current -- 5A 8-Pin SMT
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 6 Document Classification: Proprietary Information April 4, 2006, Advance
Table of Contents
SECTION 1. SIGNAL DESCRIPTION................................................................... 7
1.1 Pin Diagram.....................................................................................................................7
1.2 Pin Description.............................................................................................................11
SECTION 2. FUNCTIONAL DESCRIPTION......................................................... 13
2.1 Output Voltage - Any Voltage™ Technology.............................................................13
2.2 Output Voltage Margining............................................................................................14
2.3 Regulation and Start-up........ ... ... ... .... ... ................ ... ... .... ... ... ... .... ... ... ... ... .... ... ... ... .......15
2.4 Digital Soft Start ...........................................................................................................15
2.5 Undervoltage Lockout (UVLO)....................................................................................16
2.6 Thermal Shutdown.......................................................................................................16
2.7 PGOOD..........................................................................................................................16
SECTION 3. ELECTRICAL SPECIFICATIONS..................................................... 17
3.1 Absolute Maximum Ratings .................... ................ ... .... ... ... ... .... ... ... ... ... .... ... ... ... .... ...17
3.2 Recommended Operating Conditions........................................................................17
3.3 Electrical Characteristics.............................................................................................18
3.4 Startup Waveforms......................................................................................................20
3.5 Load Transient Response Waveforms.......................................................................23
3.6 Thermal Shutdown.......................................................................................................24
3.7 Switching Waveforms........... ... ... ... .... ... ... ................ ... .... ... ... ... .... ... ... ... ... .... ................24
3.8 Efficiency.......................................................................................................................26
SECTION 4. MECHANICAL DRAWINGS............................................................ 27
4.1 Mechanical Drawings for 88MG875z-x .......................................................................27
4.2 Mechanical Drawings for 88MG876-x.........................................................................30
SECTION 5. ORDERING INFORMATION............................................................ 32
5.1 Ordering Part Numbers and Package Markings........................................................32
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 7
Signal Description
Pin Diagram
Section 1. Signal Description
1.1 Pin Diagram
Figure 1: 88MG875z-S Package - Component View
Figure 2: 88MG875z-D Package - Component View
12 45 7896101112
3
1: LDO 7: PSET
2: SDI 8: VSET
3: Mi ssi ng Pi n 9: GND
4: ENABLE 10: GND
5: PGOOD 11: VOUT
6: VIN 12: VOUT
88MG875z-S
1
2
4
3
567
8
9
1: GND 6: SDI
2: PSET 7: VSET
3: VIN 8: PGOOD
4: ENABLE 9: VOUT
5: LDO
88MG875z-D
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 8 Document Classification: Proprietary Information April 4, 2006, Advance
Figure 3: 88MG875z-T Packages - Component View
Figure 4: Connection Block Configuration Sample for 88MG875z -S
1
2
3
45 6 7
8
9
1: GND 6: SDI
2: PSET 7: VSET
3: VIN 8: PGOOD
4: ENABLE 9: VOUT
5: LDO
88MG875z-T
88MG875z-S
VOUT
GND
VIN
EN
GND
3V-5.5V
VSET
PSET
Optional
Load
LDO
Load
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 9
Signal Description
Pin Diagram
Figure 5: 88MG876-S Package - Component View
Figure 6: 88MG876-D Package - Component View
1345 867 10911
1: SDI 5: VI N 9: GND
2: MI SSI NG PI N 6: PSET 10: VOUT
3: ENABLE 7: VSET 11: VOUT
4: PGOOD 8: GND
288MG876-S
1
2
4
3
56
7
8
1: GND 5: SDI
2: PSET 6: VSET
3: VIN 7: PGOOD
4: ENABLE 8: VOUT
88MG876-D
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 10 Document Classification: Proprietary Information April 4, 2006, Advance
Figure 7: 88MG876-T Package - Component View
Figure 8: Connection Block Configuration Sample for 88MG876-S
1: GND 5: SDI
2: PSET 6: VSET
3: VI N 7: PGOOD
4: ENABLE 8: VOUT
1
2
3
456
7
8
88MG876-T
88MG876-S
VOUT
GND
VIN
EN
GND
3V-5.5V
VSET
PSET
Optional
Load
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 11
Signal Description
Pin Description
1.2 Pin Description
Name Pin Description
LDO_OUT1
1. This pin is present in 88MG875z.
Secondary Output Voltage. Connect directly to load with a short wide PCB trace.
PSET Percent Set.
An external resistor is connected to the ground to trim the set voltage by the percentag e
value. See Table 3 in the Section 2.1 "Output Voltage - Any Voltage™ Technology" on page
13 for resistor values and percentage options.
The total cap acit ance across this pin and GND should be le ss than 25 pF. Shorting this pin to
ground, floating this p in, or usin g RVSET >619K or R
VSET < 7.68 K does not affect the set volt -
age. A resistor with tolerance of 5% or better mus t be used. If thi s pin is not us ed, it is rec om-
mended that the pin be tied to GND.
GND Power ground.
Connect this pin to a suitable low-impedance ground plane.
NC Not connected.
No pin.
VSET Voltage set.
An external resistor is connected to ground to set the output voltage of the switching regula-
tor. See Table 3 in the Section 2.1 "Output Voltage - Any Voltage™ Technology" on page 13
for resistor values and output voltage options.
The total cap acit ance across this pin and GND should be le ss than 15 pF. Shorting this pin to
ground, floating this pin, or using RVSET > 619K or RVSET < 7.68K disabl es th e s w it c hing reg-
ulator. A resistor with tolerance of 5% or better must be used.
VOUT Output voltage.
Connect directly to load with a short wide PCB trace.
VIN 3V - 5.5V Input voltage.
EN Enable
Logic low (≤ 0.8V) disables the reg ulato r. Open collector will enabl e the reg ulator due to inter-
nal pull-up resistor provided. T he high signal has to be at least 20 µs in duration to enable the
regulator.
TDO Terminal Data Ou tput. This pin is a speci al function pin. Cont act your Marvell® represent ative
for information otherwise this pin should be left floating.
TDI Terminal Data Input. This pin is a special function pin. Contac t your Marvell® representative
for information otherwise this pin should be left floating.
PGOOD The power good pin (PG) is an activ e-high, open-drain output p in. Refer to Section 2.7 for fur-
ther details on the PGOOD pin.
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 12 Document Classification: Proprietary Information April 4, 2006, Advance
Table 2: Pin Number Assign me n t Table
Pin Name 88MG875z-S 88MG875z-D/T 88MG876-S 88MG876-D/T
LDO_OUT15- -
SDI2615
GND 9, 10 1 8, 9 1
MISSING PIN 3 - 2 -
VSET8776
VOUT 11, 12 9 10, 11 8
VIN6353
ENABLE4434
PGOOD5847
PSET7262
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 13
Functional Description
Output Voltage - Any Voltage™ Technology
Section 2. Functional Description
2.1 Output Voltage - Any Voltage™ Technology
The output voltage of the 88MG875z-x/88MG876-x Series devices is programmed by using the look-up Table 3 to
select the resistor value for the VSET and PSET pins. 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 165k resistor is selected for the VSET pin, and an 11k resistor is selected
for the PSET pin. The 165k resistor sets the output voltage to 2.5V and the 11k resistor trims the set voltage off by
10% (or -10%). Using a resistor value greater than 619k or less than 7.68k for the VSET pin disables the switching
regulator and sets the SW pin to high impedance. Using a resistor value greater than 619k or less than 7.68k for
the PSET pin does not affect the set voltage.
Using a VSET resistor with value greater than 619 kohm or less than 7.68 kohm 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 out-
put can be either higher or lower tha n the set voltage.
Using a resistor value greater than 619 kohm or less than 7.68 kohm for the PSET pin does not affect the set volt-
age. 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 3: Any Voltage Programming Table for 5% Resistors
PSET
-10.0% –7.5% –5.0% –2.5% 2.5% 5.0% 7.5% 10.0%
VSET
11k 18k 30k 51k GND 100k 160k 270k 470k
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 1.575 1.575 1.613 1.650
100k 1.620 1.665 1.710 1.755 1.800 1.890 1.890 1.925 1.980
160k 2.250 2.313 2.375 2.438 2.500 2.625 2.625 2.688 2.750
270k 2.700 2.775 2.850 2.925 3.000 3.150 3.150 3.225 3.300
470k 2.970 3.053 3.135 3.218 3.300 3.465 3.465 3.548 3.630
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 14 Document Classification: Proprietary Information April 4, 2006, Advance
The VSET and PSET resistor are read once during start-up before the output voltage is turned on. After the output
voltage is turned on, the VSET and PSET resisters are ignored.The benefit of this is that the output voltage toler-
ance is not dependant upon the tolerance or thermal characteristics of these resistors.
2.2 Output Voltage Margining
A useful application of the Marvell® Any Voltage™ technology is “output voltage margining”. V oltage margining is
commonly used during system qualification to evaluate operation at “corner” conditions of voltage, temperature
etc. T ypically, output voltage will be offset up and down by some percentage (margin) of the nominal value. For the
88MG875z-x/88MG876-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 3, 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 3 prescribes a value of R1 for
the VSET resistor . This selection is shown in Figure 9 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 3. 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 9, if S1 is closed and S2
opened a positive 5% offset would be added to the nomina l 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.
Table 4: Any Voltage Programming Table for 1% Resistors
PSET
-10.0% –7.5% –5.0% –2.5% 2.5% 5.0% 7.5% 10.0%
11k 18.7k 31.6k 53.6k Open
/GND 97.6k 165k 280k 475k
VSET
GND 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
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
Open 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 15
Functional Description
Regulation and Start-up
Figure 9: Output Voltage Margining
2.3 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 operati on 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 applicatio ns. 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 rip-
ple output voltage. The step-down regulator operates in the PFM and Discontinuous Conduction Mode (DCM) (A
and D) to limit the switching action for optimum efficiency in light load applications. In this mode, the average out-
put voltage is slightly higher than the average output voltage for heavy transient load applications.
Figure 10: Output Voltage Window
2.4 Digital Soft Start
During start-up, the 88MG875z-x/88MG876-x provides a soft start function. Soft start reduces surge current s from
input voltage and provides a well-controlled output voltage rise characteristics. The rate of the output voltage start-
up is limited by the value of the output capacitor and the internal current limit circuitry. This combination forces the
output voltage to come up slowly, providing a soft-start characteristic.
During soft start, the 88MG875z-x/88MG876-x feeds a constant current to the outpu t capacitor in several steps.
Figure 11 shows the inductor current waveform during startup. The current limit is ramped up in 7 steps beginning
at approximately 40% of the current limit rating and ending at 100% at 25 µs per step. The buck regulator behaves
like a current source during this time as the output ramps up slowly.
88MG876-x
VOUT
Load
GND
VIN
EN
GND
3V-5.5V
VSET
PSET
R1
R2
S1S2
R3
Typical Vout
PFM Mode
PWM Moed
PFM Mode
A
B
D
D
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 16 Document Classification: Proprietary Information April 4, 2006, Advance
2.5 Undervoltage Lockout (UVLO)
The 88MG875z-x/88MG876-x Series incorporates undervoltage-lockout circuitry to disable the step-down regula-
tor when the input voltage is below 2.75V (typical). The step-down regulator is enabled when the input voltage is
above 2.85V (typical).
2.6 Thermal Shutdown
If the junction temperature of the Control IC on 88MG875z-x/88MG876-x Series exceeds 150°C (typical), the ther-
mal shutdown circuitry disables the step-down regula to r. The step-down regulator is enabled when the junction
temperature falls to 120°C (typ ical).
2.7 PGOOD
The power good pin (PG) is an active-high, open-drain output pin. It is asserted when the output voltage of the
step-down regulator is below the threshold. When the output voltage is above the threshold, the power good pin is
de-asserted. 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 – 130mV (typical). A built-in 25µs (tDELAY) delay
is incorporated to prevent nuisance tripping.
VOUT_LDO
VOUT_BUCK
Enable
Figure 11: Start-up Using the Enable Pin
2V/DIV
1V/DIV
2V/DIV
1 ms/DIV
VPG
0V
VPGH
VPGL
< t DELAY
> t DELAY
VPGTH
VBUCK
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 17
Electrical Specifications
Absolute Maximum Ratings
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 -0.6 to (VIN + 0.3) V
Percentage Set Voltage to GND VPSET -0.6 to (VIN + 0.3) V
Shutdown Voltage to GND VSHDN -0.6 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 mee t the speci fica tions 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
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 18 Document Classification: Proprietary Information April 4, 2006, Advance
3.3 Electrical Characteristics
The following applies unle ss othe rwise 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 10 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
Shutdown Input Current ISHDN VSHDN = GND or 5.5V ±1 µA
Over-Temperature Thermal
Shutdown TOTS TJ increasing (disable
regulator) 150 °C
TJ decreasing (enab le
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 = 0.5A 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
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 19
Electrical Specifications
Electrical Characteristics
Table 5: LDO Output Electrical Characteristics
Parameter Symbol Condition Min Typ Max Units
Line Regulation LDO IOUT = 800 mA 0.2 %
VIN = -4.0V to 5.5V
Load Regulation LDO IOUT = 10 mA to 800 mA 0.5 %
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 20 Document Classification: Proprietary Information April 4, 2006, Advance
3.4 Startup Waveforms
NOTE: There is a delay (3.5 ms typ) before the output voltage turns on. The actual threshold is before delay.
VOUT_LDO
VOUT_BUCK
Enable
Start-up Using the Enable Pin
2V/DIV
1V/DIV
2V/DIV
VOUT_LDO
VOUT_BUCK
Enable
Turn Off Using the Enable Pin
2V/DIV
1V/DIV
2V/DIV
1 ms/DIV 1 ms/DIV
VIN = 5.0V tDLY ~ 4 ms VIN = 5.0V
VLDO = 3.3V VLDO = 3.3V
VBUCK = 1.2V VBUCK = 1.2V
ILOAD = No Load ILOAD = No Load
VOUT_BUCK
Enable
Enable Threshold at VIN = 3.0V
1V/DIV
2V/DIV
VOUT_BUCK
Enable
Enable Thre sh old at VIN = 5.0V
1V/DIV
2V/DIV
10 ms/DIV 10 ms/DIV
VIN = 3.0V VTH = 1.47V (N ote) VIN = 5.0V VTH = 2.33 V (Note)
VLDO = 3.3V VLDO = 3.3V
VBUCK = 1.2V VBUCK = 1.2V
ILOAD = No Load ILOAD = No Load
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 21
Electrical Specifications
Startup Waveforms
VOUT_LDO
VOUT_BUCK
VIN
VIN Soft Start
2V/DIV
1V/DIV
2V/DIV
VIN
VLDO
VBUCK
VIN Hot Plug
5V/DIV
2V/DIV
1V/DIV
2 ms/DIV 1 m s /DI V
VIN = 5.0V LDO Start = 1.7V VIN = 5.0V tDLY = 4 ms
VLDO = 3.3V VLDO = 3.3V
VBUCK = 1.2V VBUCK = 1.2V
ILOAD = No Load ILOAD = No Load
VOUT_BUCK
I_L
Buck Rise Time
1V/DIV
2A/DIV
VOUT_LDO
3.3V
LDO Rise Time
1V/DIV
20 μs/DIV 50 μs/DIV
VIN = 5V tRISE = 75 μsV
IN = 5.0V tRISE = 100 μs
VOUT= 3.3V VLDO= 3.3V
ILOAD = 7.5A
_
_
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 22 Document Classification: Proprietary Information April 4, 2006, Advance
I_L
Soft Start Current Limit
2A/DIV
VOUT_BUCK
VIN
UVLO Threshold
1V/DIV
200mV/DIV
50 μs/DIV 100 ms/DIV
VIN = 5.0V ILIMIT = 7.5A VLDO= 3.3V VHTH = 2.966V
VLDO = 3.3V VBUCK = 1.2V VLTH = 2.792V
VBUCK = 1.2V ILOAD = No Load
Temperature Deratin g
0
1
2
3
4
5
6
25 35 45 55 65 75 85
Tempera ture (Degree C)
Output Current (Amps)
Sti ll Ai r
100 LFM
_
_
_
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 23
Electrical Specifications
Load Transient Response Waveforms
3.5 Load Transient Response Waveforms
VOUT
ILOAD
Load Transient Response
100mV/DIV
1A/DIV
VOUT
ILOAD
Double-Pulsed Lo ad Response
100mV/DIV
1A/DIV
20 μs/DIV 20 μs/DIV
VIN = 5.0V ILOAD = 0.5A to 5A VIN = 5.0V ILOAD = 0.5A to 5A
VBUCK = 1.0V tRISE = 11 A/μsV
OUT = 1.0V tRISE = 11 A/μs
tFALL= 176 A/μst
FALL= 176 A/μs
VSW
VOUT
ILOAD
Rise Time
5V/DIV
100mV/DIV
1A/DIV
VOUT
ILOAD
Fall Time
100mV/DIV
1A/DIV
20 μs/DIV 20 μs/DIV
VIN = 5.0V ILOAD = 0.5A to 5A VIN = 5.0V ILOAD = 0.5A to 5A
VBUCK = 1.0V tRISE = 11 A/μsV
BUCK = 1. 0V tRISE = 11 A/μs
tFALL= 176 A/μst
FALL= 176 A/μs
_
_
_
_
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 24 Document Classification: Proprietary Information April 4, 2006, Advance
3.6 Thermal Shutdown
3.7 Switching Waveforms
VOUT_BUCK
TA
G75 Lower Thermal Shu tdown
1V/DIV
100°C/DIV
VOUT_BUCK
TA
G75 Upper Thermal Shutdown
1V/DIV
100°C/DIV
5 ms/DIV 5 ms/DIV
VIN = 5.0V ILOAD = 5.0A VIN = 5.0V ILOAD = 5.0A
VBUCK = 1.2V LTH = 107.65 °C VBUCK = 1.2V UTH = 150.68 °C
VSW
I_L
VOUT
20 MHz
VIN
PWM mode
2V/DIV
1A/DIV
5mV/DIV
100mV/DIV
VSW
VOUT
I_L
DCM Mode
2V/DIV
20mV/DIV
1A/DIV
500 ns/DIV 5 μs/DIV
VIN = 5.0V VIN(PK-PK) = 110 mV VIN = 5.0V IIND(PK) = 1.33A
VBUCK = 1.5V IIND(PK-PK) = 1.5A VBUCK = 1.5V Freq = 105 KHz
IOUT = 5A IIND(PK) = 5.87A IOUT = 50 mA
VOUT(PK-PK) = 7.62 mV Freq = 950 KHz VOUT(PK-PK) = 3. mV
2
5
_
_
_
_
_
_
_
_
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 25
Electrical Specifications
Switching Waveforms
NOTE: For repeatabili ty of measuring output ripple (VOUT(P-P)), the test procedure is to set the scope bandwidth to 20
MHz and use a coax cable with very short leads terminated into 50Ω. The coax leads must be routed as far as
possible from the switching node.
VOUT
20 MHz
PWM Mode Output Ripple
10mV/DIV
VSW
VOUT
I_L
DCM Mode
2V/DIV
20mV/DIV
1A/DIV
10 ms/DIV 500 ns/DIV
VIN = 5.0V VOUT(PK-PK) = 9.79.mV VIN = 5.0V Freq Ringing = 5.09 MHz
VLDO = 3.3V VLDO = 3.3V
VBUCK = 1.5V VBUCK = 1.5V
ILOAD = 5.0A ILOAD = 50 mV
_
_
_
88MG875z-x/88MG876-x
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 26 Document Classification: Proprietary Information April 4, 2006, Advance
3.8 Efficiency
EFFICIENCY VS. OUTPUT CURRENT
VIN = 5.0V @ 25°C
EFFICIENCY VS. OUTPUT CURRENT
VIN = 3.3V @ 25°C
50
60
70
80
90
100
012345
Output Current (A)
Efficiency (%)
3.3V
2.5V
1.8V
1.2V
1.0V
0.8V
50
60
70
80
90
100
012345
Output Current (A)
Efficiency (%)
3.3V
2.5V
1.8V
1.2V
1.0V
0.8V
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 27
Mechanical Drawings
Mechanical Drawings for 88MG875z-x
Section 4. Mechanical Drawings
4.1 Mechanical Drawings for 88MG875z-x
Figure 12: 88MG875z-S Mechanical Dimensions (SIP Package)
0.047(1.19)MAX.
PCB
0.025(0.64)
(2.16) (2.16) (2.16) (2.16) (2.16) (2.16)(2.16) (2.16)
11-Ø0.0287(0.71)
124578961011
(2.16)
12
3
Top View Side View
88MG875z-x/88MG876-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 28 Document Classification: Proprietary Information April 4, 2006, Advance
Figure 13: 88MG875z-D Mechanical Dimensions (DIP Package)
9- Ø0. 046( 1. 17)
(3.18) (3.18) ( 3. 18)
(1.52)
1
2
4
3
567
8
9
0. 495( 12. 57)
PI N( 9X) ROUND
PCB
Top View Side View
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 29
Mechanical Drawings
Mechanical Drawings for 88MG875z-x
Figure 14: 88MG875z-T Mechanical Dimensions (SMT Package )
0.984(25.00)
0.354(9.00)
1.104(28.04)
0.125
0.495(12.57)
(3.18)(3.18)
0.125
(3.18)
0.1250.059(1.51)
0.197(5.00)
0.060(1.52)
1
2
3
45 6 7
8
9
PCB
TOP VIEW SIDE VIEW
9X Rect 0.079(2.0)by
0.099(2.52)PAD
Bott om La ye r
9X Dia 0.079(2.0)PAD
Top Layer
For test point only
0.150(3.81)
0.032(0.81)
88MG875z-x/88MG876-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 30 Document Classification: Proprietary Information April 4, 2006, Advance
4.2 Mechanical Drawings for 88MG876-x
Figure 15: 88MG876-S Mechanical Dimensions (SIP Package)
(2.16)(2.16)(2.16)(2.16)(2.16)(2.16) (2.16)(2.16)
10- Ø0. 0287( 0. 71)
1345 867 10911
2
0. 158( 4. 01)
0. 025(0. 64)
0. 032( 0. 81)
0. 047( 1. 19) MAX.
PCB
0. 150(3. 81)
Top V iew
Side View
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 31
Mechanical Drawings
Mechanical Drawings for 88MG876-x
Figure 16: 88MG876-D Mechanical Dimensions (DIP Package)
Figure 17: 88MG876-T Mech anical Dimensions (SMT Package)
8- Ø0.046(1.17)
0.750(19.06)
0.125
(3.18)
0.060(1.51) 0.125
(3.18)
0.125
0.495(12.57)
0.125
(3.18) (3.18)
0.060(1.52)
0.250(6.36)
(3.18)
0.125
0.870(22.10)
1
2
4
3
56
7
8
0.215(5.46)
P
C
B
Top View Side View
0.750(19.06)
0.125
(3.18)
0.060(1.51) 0.125
(3.18)
0.125
0.495(12.57)
0.125
(3.18) (3.18)
0.060(1.52)
0.250(6.36)
(3.18)
0.125
0.870(22.10)
1
2
3
45 6
7
8PCB
TOP VIEW SIDE VIEW
8X Dia 0.079(2.0)PAD
Top Layer
For test point only
8X Rect 0.079(2.0) by
0.099(2.52)PAD
Bottom Layer
0.150(3.81)
0.032(0.81)
88MG875z-x/88MG876-x Series
5A Rated Output Current, Non-Isolated, Step-Down Switching Regulator
Module with AnyVoltage™ Technology
Doc. No. MV -S102822-00, Rev. B Copyright © 2006 Marvell
Page 32 Document Classification: Proprietary Information April 4, 2006, Advance
Section 5. Ordering Information
5.1 Ordering Part Numbers and Package Markings
Figure 18 shows the typical ordering part numbering scheme for the MDS-G76 part. Markings for the other vari-
ants are similar. For complete ordering information, contact your Marvell FAE or sales representative.
Figure 18: 88MG875z Sample Ordering Part Number
Figure 19: 88MG876 Sample Ordering Part Number
88MG875zA0-x
Part Number
Internal Marvell Code
B = 3. 3V, E = 2.5 V
Voltage Option LDO
Package Code
88MG876
Part Number
-A0-x
Internal Marvell Code
Package Code
Copyright © 2006 Marvell Doc. No. MV-S102822-00, Rev. B
April 4, 2006, Advance Document Classification: Proprietary Information Page 33
Ordering Information
Ordering Part Numbers and Package Markings
The standard ordering part number for the respective solution is shown in Table 6.
Figure 20 shows a typical package marking and pin 1 location for the 88MG876 part. Markings for the other vari-
ants are similar.
Figure 20: 88MG876 Package Marking
Table 6: Ordering Part Numbers
Part Number Switcher
Output
Voltage
LDO
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, an d correlation with statistical process controls.
Package
88MG875B-S Programmable 3.3V 5A -40°C to 85°C 12-pin SIP
88MG875B-D Programmable 3.3V 5A -40°C to 85°C9-pin DIP
88MG875B-T Programmable 3.3V 5A -40°C to 85°C9-pin SMT
88MG875E-S Programmable 2.5V 5A -40°C to 85°C 12-pin SIP
88MG875E-D Programmable 2.5V 5A -40°C to 85°C9-pin DIP
88MG875E-T Programmable 2.5V 5A -40°C to 85°C9-pin SMT
88MG876-S Programmable -- 5A -40°C to 85°C 11-pin SIP
88MG876-D Programmable -- 5A -40°C to 85°C8-pin DIP
88MG876-T Programmable -- 5A -40°C to 85°C8-pin SMT
G76-X
YWW$ Lot Code
Part Number
Package Code
Work week
Last digit of year
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