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參數(shù)資料
| 型號： | ADP3155JRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5-Bit Programmable Triple Power Supply Controller for Pentium III Processors |
| 中文描述： | SWITCHING CONTROLLER, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大小： | 200K |
| 代理商： | ADP3155JRU |
REV. A
ADP3155
–7–
Power Good
The ADP3155 has an internal monitor that senses the output
voltage and drives the PWRGD pin of the device. This pin is an
open drain output whose high level (when connected to a pull-
up resistor) indicates that the output voltage has been within a
±
5% regulation band of the targeted value for more than 500
μ
s.
The PWRGD pin will go low if the output is outside the regula-
tion band for more than 500
μ
s.
Output Crowbar
An added feature of using an N-channel MOSFET as the syn-
chronous switch is the ability to crowbar the output with the
same MOSFET. If the output voltage is 15% greater than the
targeted value, the ADP3155 will turn on the lower MOSFET,
which will current-limit the source power supply or blow its
fuse, pull down the output voltage, and thus save the micropro-
cessor from destruction. The crowbar function releases at ap-
proximately 50% of the nominal output voltage. For example, if
the output is programmed to 2.0 V, but is pulled up to 2.3 V or
above, the crowbar will turn on the lower MOSFET. If in this
case the output is pulled down to less than 1.0 V, the crowbar
will release, allowing the output voltage to recover to 2.0 V if
the fault condition has been removed.
Shutdown
The ADP3155 has a shutdown (SD) pin that is pulled down by
an internal resistor. In this condition the device functions nor-
mally. This pin should be pulled high to disable the output drives.
APPLICATION INFORMATION
A number of power conversion requirements must be consid-
ered when designing an ACPI compliant system. In normal
operating mode, 12 V, 5 V and 3.3 V are available from the
main supply. These voltages need to be converted into the
appropriate supply voltages for the Northbridge core, the
Southbridge core and RAMBUS memory, as well as supplies for
GTL and I/O drivers, CMOS memory and clock and graphics
(AGP) circuits.
During the standby operating state, the 12 V, 5 V and 3.3 V
power supply outputs are disabled, and only a low power 5 V
rail (5VSB) is available. The circuits that must remain active in
standby must be able to run from 5VSB. To accomplish this,
power routing is required to allow switching between normal
and standby supplies. Lack of a 12 V rail in standby makes control
of linear outputs difficult, and with up to 8 A demand from the
1.5 V and 1.8 V rails, an all-linear solution is inefficient.
Figure 14 shows a typical ACPI-compliant Pentium III/chipset
power management system using the ADP3155 and ADP3156.
The ADP3155 provides VID switched output and two linear
regulators for standby operation. A charge-pump-doubled 5VSB is
ORed into the supply rail to supply the linear regulators during
standby operation. The VID output collapses when the main
5 V rail collapses, but the N-channel MOSFET linear regu-
lators can continue to supply current from the ~9 V supply.
The ADP3156 provides 1.8 V via its main switching regulator,
and allows efficient linear regulation of 1.5 V rail by using the
1.8 V output as its source.
Specifications for a Design Example
The design parameters for a typical 300 MHz Pentium II appli-
cation (Figure 2) are as follows:
Input Voltage: V
IN
= 5 V
Auxiliary Input: V
CC
= 12 V
Output Voltage: V
O
= 2.8 V
Maximum Output Current:
I
OMAX
= 14.2 A dc
Minimum Output Current:
I
OMIN
= 0.8 A dc
Static tolerance of the supply voltage for the processor core:
V
OST+
= 100 mV
V
OST–
= –60 mV
5V_PM
POWER
MANAGEMENT
FUNCTIONS
V
CC
12V
POWER MANAGEMENT
STATE COMMAND
5V_PM
ATX_POWER GOOD
PMSC
5V_PM
ATXPG
V
CC
ADP3155
VID_4:0
LIN#2_
CTRLS
LIN#1_
CTRLS
MAIN_
CTRLS
SWITCHER
CTRLS
IN
OUT
LINEAR#1
CTRLS
IN
OUT
LINEAR#2
IN
CTRLS
OUT
5V
5V_PM
CPU
V
CORE
@ VID
3.3V_PM
FOR POWER
MANAGEMENT
2.5V_PM
FOR CMOS,
CLOCK, MEMORY
TRIPLE
OUTPUT
SUPPLY
VID
V
CC
ADP3156
LIN_
CTRLS
MAIN_
CTRLS
12V
DUAL
OUTPUT
SUPPLY
IN
CTRLS
OUT
SWITCHER
5V
IN
CTRLS
OUT
LINEAR
3.3V_IN
1.5V_IN
VDDQ
POWER ROUTING
SELECT
3.3V
1.8V FOR
SB CORE,
MEM, ETC
1.5V VTT
FOR GTL
1.5V OR 3.3V
VDDQ FOR AGP
TYPEDET# FOR
AGP SELECT
ATX
(OR NLX)
POWER
SUPPLY
12V
5V
3.3V
5V_ALWAYS
ATX_PGOOD
ATX_SHUTDOWN
GND
12V
5V
3.3V
5V_PM
ATX_POWERGOOD
ATX_SHUTDOWN
Figure 14. ACPI-Compliant Pentium III System Block Diagram
相關(guān)PDF資料 |
PDF描述 |
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| ADP3156JR-15 | Dual Power Supply Controller for Desktop Systems |
| ADP3156JR-18 | Dual Power Supply Controller for Desktop Systems |
| ADP3156JR-25 | Dual Power Supply Controller for Desktop Systems |
| ADP3156 | Dual Power Supply Controller for Desktop Systems |
| ADP3160 | 5-Bit Programmable 2-Phase Synchronous Buck Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3155JRU-REEL | 制造商:Rochester Electronics LLC 功能描述:5-BIT PROGRAMMBLE TRIPLE POWER SUPPLY - Tape and Reel |
| ADP3155JRU-REEL7 | 功能描述:IC PS TRPL PENTIUM III 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝 |
| ADP3156 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Power Supply Controller for Desktop Systems |
| ADP3156JR-1.5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADP3156JR-1.5-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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