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| 型號： | P95020NQG |
| 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： | 10 X 10 MM, 0.85 MM HEIGHT, QFN-132 |
| 文件頁數(shù)： | 165/169頁 |
| 文件大小： | 4297K |
| 代理商： | P95020NQG |
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IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
95
2011 Integrated Device Technology, Inc.
Table 151. Buck Regulator Clock Frequency Control Register
DESCRIPTION ADDRESS (I2C)
VALUE
1 MHz
Page-0:129( 0x81[1]) for
Buck#0 (500mA)
Page-0: 131(0x83[1]) for
Buck#1 (500mA)
Page-0: 131(0x85[1]) for
Buck#2 (1000mA)
0x81 [1] = 0
0x83 [1] = 0
0x85 [1] = 0
2 MHz
Page-0:129( 0x81[1]) for
Buck#0 (500mA)
Page-0: 131(0x83[1]) for
Buck#1 (500mA)
Page-0: 131(0x85[1]) for
Buck#2 (1000mA)
0x81 [1] = 1
0x83 [1] = 1
0x85 [1] = 1
Buck Regulators – Enable / Disable
There are two methods of disabling each Buck Converter: the Global Enable bit and the local ENABLE bit (Output Voltage
Register, Bit 7). Table 152 shows the interoperation of the two methods.
Table 152. Interoperability of enabling/disabling methods vs. loading default values.
INTERNAL
POR
GLOBAL
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
Initialization and Power-Up
During an IC re-initialization or “cold boot”, an internal
POR disables the Buck 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 Registers are:
Table 153. Output Voltage Register Default Settings
FUNCTION
DEFAULT SETTING
Local Enable Bit
Disabled
Output Voltage
3.3V (BUCK500_0)
1.8V (BUCK500_1)
1.2V (BUCK1000)
The default settings for the Control Register are:
Table 154. Control Register Default Settings
FUNCTION
DEFAULT SETTING
Current Limit
100%
Clock Frequency
2 MHz
Operating Mode
PWM
After the POR releases, the individual Global Enable bits
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 a converter, the local ENABLE bit is set to
HIGH by writing the voltage value to the Output Voltage
Register. The Output Voltage value must be included
each time the converter is enabled or disabled. There is a
default value for each converter that can be read and
written back along with the ENABLE bit or a different value
can be written. When the ENABLE bit becomes set the
Buck Converter will then enter its soft-start sequence, and
transition to the programmed voltage.
NOTE: Changes to the Output Voltage Register settings
can be written directly without disabling the converter.
Normal Disabling / Enabling
Setting either the Global Enable bit to LOW or the local
ENABLE bit to LOW will turn off the Buck Converter.
The Global Enable bit’s sole purpose is to shut down the
converter into its lowest power shutdown mode. It is not
intended to be used to toggle the Buck Converter off and
on. Proper operation is only guaranteed by toggling the
ENABLE bit once the Global Enable bit is set HIGH to
take it out of low power shutdown mode.
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