List of Figures
List of Figures
Product Overview.......................................................................................................................................3
Figure 1: Typical High Efficiency 5.0V to 0.8V/2.0A Step-Down Regulator with 3.3V LDO Regulator ..............3
1
Signal Description ........................................................................................................................... 13
Figure 2:
12-Pin DFN Pin Diagram—MVPG30x Top View ..............................................................................13
Figure 3:
12-Pin DFN Pin Diagram—MVPG31 Top View ................................................................................14
2
3
Electrical Specifications ................................................................................................................. 17
Functional Description.................................................................................................................... 23
Figure 4:
Figure 5:
Figure 6:
Figure 7:
Figure 8:
Figure 9:
Figure 10:
MVPG30x/MVPG31 Block Diagram .................................................................................................23
Output Voltage Window....................................................................................................................24
Inductor Current Steps at Startup.....................................................................................................25
Soft Startup (0.8V, 1.2V, 1.8V, 2.5V, 3.3V) ......................................................................................25
Soft Startup.......................................................................................................................................25
Startup Sequence ............................................................................................................................27
V
SET = 2.5V and PSET = -5%............................................................................................................27
Figure 11: Maximum Output Current for the FDS642P P-Channel MOSFET....................................................29
Figure 12: UVLO and OVP Waveforms .............................................................................................................30
Figure 13: Adaptive Transient Response ..........................................................................................................31
4
Functional Characteristics.............................................................................................................. 33
Figure 14: Startup Using the Shutdown Pin ......................................................................................................33
Figure 15: Turn Off Using the Shutdown Pin .....................................................................................................33
Figure 16: Enable Threshold at VIN = 3.5V........................................................................................................33
Figure 17: Enable Threshold at VIN = 5.0V........................................................................................................33
Figure 18: Input Voltage Soft Start.....................................................................................................................34
Figure 19: Input Voltage Hot Plug......................................................................................................................34
Figure 20: Step-Down Output Rise Time...........................................................................................................34
Figure 21: Soft Start Current Limit Steps...........................................................................................................34
Figure 22: UVLO and OVP Thresholds..............................................................................................................35
Figure 23: Switching Waveforms— PWM Mode ...............................................................................................36
Figure 24: Switching Waveforms— DCM Mode.................................................................................................36
Figure 25: PWM Output Ripple Voltage.............................................................................................................36
Figure 26: Switching Waveforms— DCM Mode-Zoom ......................................................................................36
Figure 27: Load Transient Response ................................................................................................................37
Figure 28: Double-Pulsed Load Response........................................................................................................37
Figure 29: Load Transient Response ................................................................................................................37
Figure 30: Double-Pulsed Load Response........................................................................................................37
Figure 31: Load Transient Response ................................................................................................................38
Figure 32: Double-Pulsed Load Response........................................................................................................38
Copyright © 2008 Marvell
April 14, 2008, 2.00
Doc. No. MV-S102809-00 Rev. G
Page 7
Document Classification: Proprietary
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
