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參數(shù)資料
| 型號： | P95020ZNQGI |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132 |
| 封裝： | QFN-132 |
| 文件頁數(shù)： | 129/137頁 |
| 文件大?。?/td> | 3533K |
| 代理商： | P95020ZNQGI |
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P95020 / Preliminary Datasheet
Revision 0.7.10
91
2010 Integrated Device Technology, Inc.
10.2.2
BOOST5 - Control Register
The Control Register contains Power Good, Peak Current Limit and Clock Select settings
IC Address = Page-0: 137(0x89), C Address = 0xA089
Bit
Bit Name
Def.
Set.
User
Type
Value
Description / Comments
0
RESERVED
0b
RW
1
CLOCK_SEL
1b
RW
1 = 1.0 MHz
0 = 0.5 MHz
Clock Frequency
[3:2]
I_LIM
11b
RW
[See Table 25]
Peak Current Limit
4
RESERVED
0b
RW
5
PGOOD
0b
R
1 = Power Good
0 = Power Bad
Power Good
[7:6]
RESERVED
00b
RW
RESERVED
Table 25
– Register 0xA089 (0x89) Peak Current Limit (I_LIM) Settings Bits [3:2]
Bit 3
Bit 2
Description
0
Peak Current Limit = 25 %
0
1
Peak Current Limit = 50 %
1
0
Peak Current Limit = 75 %
1
Peak Current Limit = 100 % A
Note
– Peak Current Limit is maximum when bits [3:2] are both set to 1.
10.3 BOOST5 - ENABLING & DISABLING
There are two methods of disabling the BOOST5 Converter: the Global Enable bit and the local ENABLE bit. Table 26
shows the interoperation of the two methods.
Table 26
– Interoperability of enabling/disabling methods vs. loading default values.
Internal POR
Global Enable
ENABLE
ON/OFF status
REGISTER VALUE STATUS
0
X
0
OFF
PREVIOUS SETTINGS
0
X
OFF
PREVIOUS SETTINGS
0
1
ON
PREVIOUS SETTINGS
1
X
OFF
LOAD DEFAULT VALUES
10.3.1
BOOST5 - INITIALIZATION AND DEVICE POWER-UP
During an IC re-
initialization or “cold boot” an internal POR disables the BOOST5 Converter and loads the default values
into the registers. The default values are only loaded into the registers when there is a POR event.
The default settings for the Output Voltage Register are:
Function
Default Setting
Local Enable Bit
Disabled
Output Voltage
5.0V
The default settings for the Control Register are:
Function
Default Setting
Current Limit
100%
Clock Frequency
1 MHz
After the POR releases, the Global Enable bit can be set to HIGH. Since the default value of the local ENABLE bit is
LOW, the supply will not start at this time.
To enable the BOOST5 converter,
the local ENABLE bit is set to HIGH by writing a “1” to the Output Voltage Register.
The Output Voltage value must be included each time the converter is enabled or disabled. The default value for the
converter is read and written back along with the ENABLE bit or a different voltage can be written. When the ENABLE bit
becomes set the BOOST5 Converter enters its soft-start sequence, ending up at the programmed voltage.
NOTE: Changes to the Output Voltage Register settings can be written directly without disabling the converter.
10.3.2
BOOST5 - Normal Disabling / Enabling
Setting either the Global Enable bit to LOW or the local ENABLE bit to LOW will turn off the BOOST5 Converter.
The Global Enable bits sole purpose is to shut down the converter into its lowest power shutdown mode. It is not
intended to be used to toggle the BOOST5 Converter off and on. Proper operation is only guaranteed by toggling the
ENABLE bit HIGH once the Global Enable bit is set HIGH to take it out of low power shutdown mode.
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