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34708 Datasheet(PDF) 63 Page - Freescale Semiconductor, Inc

Part # 34708
Description  Power Management Integrated Circuit (PMIC) for i.MX50/53 Families
PDF  159 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

34708 Datasheet(HTML) 63 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
63
Freescale Semiconductor
MC34708
Functional Block Description
Figure 16. Voltage Stepping with DVS
7.5.5
Boost Switching Regulator
SWBST is a boost switching regulator with a programmable output, which defaults to 5.0 V on power up, operating at 2.0 MHz.
SWBST supplies 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 output voltage SWBSTOUT and SWBSTFB to sit at a Schottky drop below the
battery voltage whenever SWBST is disabled. The switching NMOS transistor is integrated on-chip. An external fly back Schottky
diode, inductor, and capacitor are required.
Figure 17. Boost Regulator Architecture
SWBST output voltage programmable via the SWBST[1:0] SPI bits as shown in Table 51.
Table 51. SWBST Voltage Programming
Parameter
Voltage
SWBST Output Voltage
SWBST[1:0]
00
5.000 (default)
01
5.050
10
5.100
11
5.150
 
Actual
Output Voltage
Example
Actual Output
Voltage
Possible
Output Voltage
Window
Internally
Controlled Steps
Output Voltage
with light Load
Initial
Set Point
Voltage
Change
Request
Internally
Controlled Steps
Output
Voltage
Requested
Set Point
Initiated by SPI Programming,Standby Control
Request for
Higher Voltage
Request for
Lower Voltage
SWxP WGD
22uF
2.2uH
Output
Drive
SWBSTLX
GNDSWBST
SWBSTIN
Boosted Output
Voltage SWBST
SWBST
SWBSTIN
BP
SWBSTFB
SPI
SPI
Registers
32KHz
Switcher
Core
Control
= Package Pin
4.7u
BP



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