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MMPF0100 Datasheet(PDF) 79 Page - Freescale Semiconductor, Inc

Part # MMPF0100
Description  14 Channel Configurable Power Management Integrated Circuit
PDF  136 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MMPF0100 Datasheet(HTML) 79 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
79
PF0100
Functional Block Requirements and Behaviors
Power Generation
7.4.5
Boost Regulator
SWBST is a boost regulator with a programmable output from 5.0 to 5.15 V. SWBST can supply the VUSB regulator for the USB
PHY in OTG mode, as well as the VBUS voltage. Note that the parasitic leakage path for a boost regulator will cause the
SWBSTOUT and SWBSTFB voltage to be a Schottky drop below the input voltage whenever SWBST is disabled. The switching
NMOS transistor is integrated on-chip. Figure 22 shows the block diagram and component connection for the boost regulator.
SWBSTLX
VOBST
Driver
Controller
EA
Z1
Z2
Internal
Compensation
I2C
Interface
SWBSTMODE
VREFUV
VREF
GNDSWBST
VIN
LBST
CINBST
DBST
SWBSTFB
RSENSE
SC
VREFSC
SWBSTFAULT
OC
UV
COSWBST
SWBSTIN
Figure 22. Boost Regulator Architecture
7.4.5.1
SWBST Setup and Control
Boost regulator control is done through a single register SWBSTCTL described in Table 87. SWBST is included in the power-up
sequence if its OTP power-up timing bits, SWBST_SEQ[4:0], are not all zeros.
Table 87. Register SWBSTCTL - ADDR 0x66
Name
Bit #
R/W
Default
Description
SWBST1VOLT
1:0
R/W
0x00
Set the output voltage for SWBST
00 = 5.000 V
01 = 5.050 V
10 = 5.100 V
11 = 5.150 V
SWBST1MODE
3:2
R
0x02
Set the Switching mode on Normal operation
00 = OFF
01 = PFM
10 = Auto (Default)(47)
11 = APS
UNUSED
4
–
0x00
UNUSED
SWBST1STBYMODE
6:5
R/W
0x02
Set the Switching mode on Standby
00 = OFF
01 = PFM
10 = Auto (Default)(47)
11 = APS



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