List of Figures
List of Figures
Figure 1:
Typical Application Circuit: Output 1.8V/1.5A and 1.2V/1.5A .............................................................3
1
Signal Description ........................................................................................................................... 11
Figure 2: 88PG82XX Family 3X4mm QFN-20 Package—Top View................................................................11
2
3
Electrical Specifications ................................................................................................................. 15
Functional Description.................................................................................................................... 19
Figure 3:
Figure 4:
Figure 5:
Figure 6:
Figure 7:
Figure 8:
Figure 9:
88PG82XX Block Diagram ...............................................................................................................19
Output Voltage Window....................................................................................................................20
Startup without Sequencing..............................................................................................................20
Startup with Sequencing and Soft Start (COUT= 22 μF) ...................................................................20
Fast Startup (0.8V, 1.2V, 1.8V, 2.5V, 3.3V) .................................................................................21
Soft Start up (0.8V, 1.2V, 1.8V, 2.5V, 3.3V) .....................................................................................21
Inrush Current with COUT = 100 μF ..................................................................................................21
Figure 10: Serial Programmability......................................................................................................................23
Figure 11: Startup Sequence ............................................................................................................................27
Figure 12: VSET = 2.5V and PSET = -5%.........................................................................................................27
Figure 13: UVLO and OVP Waveforms .............................................................................................................28
Figure 14: Power-On Reset Waveforms............................................................................................................28
Figure 15: Adaptive Transient Response ..........................................................................................................29
4
Functional Characteristics.............................................................................................................. 31
Figure 16: Startup Using the Enable Pin ...........................................................................................................31
Figure 17: Turn Off Using the Enable Pin..........................................................................................................31
Figure 18: Startup Sequence ............................................................................................................................31
Figure 19: Hot Plug............................................................................................................................................31
Figure 20: UVLO and OVP Thresholds..............................................................................................................32
Figure 21: Input Soft Start and Start up Sequence............................................................................................32
Figure 22: Step-Down Short-Circuit Response .................................................................................................32
Figure 23: Switching Waveforms - PWM mode ................................................................................................33
Figure 24: Switching Waveforms - PWM mode .................................................................................................33
Figure 25: Switching Waveforms - DCM Mode .................................................................................................33
Figure 26: Switching Waveforms - DCM Mode-Zoom........................................................................................33
Figure 27: PWM Output Ripple Voltage ............................................................................................................34
Figure 28: Fast Load Rise Time ........................................................................................................................34
Figure 29: Slow Load Rise Time........................................................................................................................34
Figure 30: Fast Load Fall Time .........................................................................................................................35
Figure 31: Slow Load Fall Time .........................................................................................................................35
Figure 32: Load Transient Response ................................................................................................................35
Figure 33: Double-Pulsed Load Response........................................................................................................35
Copyright © 2008 Marvell
April 23, 2008, 2.00
Doc. No. MV-S103563-00 Rev. C
Page 9
Document Classification: Proprietary Information
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
