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參數(shù)資料
| 型號(hào)： | ISL6505CB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Adjustable Precision Shunt Regulator 3-TO-92 -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | PLASTIC, MS-013AC, SOIC-20 |
| 文件頁(yè)數(shù)： | 13/17頁(yè) |
| 文件大?。?/td> | 371K |
| 代理商： | ISL6505CB |
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13
Layout Considerations
The typical application employing an ISL6505 is a fairly
straight forward implementation. Like with any other linear
regulator, attention has to be paid to the few potentially
sensitive small signal components, such as those connected
to sensitive nodes or those supplying critical bypass current.
The power components (pass transistors) and the
controller IC should be placed first. The controller should
be placed in a central position on the motherboard, closer
to the memory controller chip and processor, but not
excessively far from the 3.3V
DUAL
island or the I/O
circuitry. Ensure the 1V2VID, 3V3, and 3V3DL connections
are properly sized to carry 100mA without exhibiting
significant resistive losses at the load end. Similarly, the
input bias supply (5V
SB
) can carry a significant level of
current - for best results, ensure it is connected to its
respective source through an adequately sized trace. The
pass transistors should be placed on pads capable of
heatsinking matching the device’s power dissipation.
Where applicable, multiple via connections to a large
internal plane can significantly lower localized device
temperature rise.
Placement of the decoupling and bulk capacitors should
follow a placement reflecting their purpose. As such, the high-
frequency decoupling capacitors should be placed as close as
possible to the load they are decoupling; the ones decoupling
the controller close to the controller pins, the ones decoupling
the load close to the load connector or the load itself (if
embedded). Even though bulk capacitance (aluminum
electrolytics or tantalum capacitors) placement is not as
critical as the high-frequency capacitor placement, having
these capacitors close to the load they serve is preferable.
The critical small signal components include the soft-start
capacitor, C
SS
, as well as all the high-frequency decoupling
capacitors. Locate these components close to the respective
pins of the control IC, and connect them to ground through a
via placed close to the ground pad. Minimize any leakage
current paths from the SS node, as the internal current
source is only 10μA (typical).
A multi-layer printed circuit board is recommended.
Figure 12 shows the connections to most of the components
in the circuit. Note that the individual capacitors shown each
could represent numerous physical capacitors. Dedicate one
solid layer for a ground plane and make all critical
component ground connections through vias placed as close
to the component terminal as possible. Dedicate another
solid layer as a power plane and break this plane into
smaller islands of common voltage levels. Ideally, the power
plane should support both the input power and output power
nodes. Use copper filled polygons on the top and bottom
circuit layers to create power islands connecting the filtering
components (output capacitors) and the loads. Use the
remaining printed circuit layers for small signal wiring.
Component Selection Guidelines
Output Capacitors Selection
The output capacitors should be selected to allow the output
voltage to meet the dynamic regulation requirements of
active state operation (S0, S1). The load transient for the
various microprocessor system’s components may require
high quality capacitors to supply the high slew rate (di/dt)
current demands. Thus, it is recommended that the output
capacitors be selected for transient load regulation, paying
attention to their parasitic components (ESR, ESL).
Also, during the transition between active and sleep states
on the 3.3V
DUAL
/3.3V
SB
and 5V
DUAL
outputs, there is a
short interval of time during which none of the power pass
elements are conducting - during this time the output
capacitors have to supply all the output current. The output
voltage drop during this brief period of time can be easily
approximated with the following formula:
×
=
, where
V
OUT
- output voltage drop
ESR
OUT
- output capacitor bank ESR
I
OUT
- output current during transition
C
OUT
- output capacitor bank capacitance
t
t
- active-to-sleep or sleep-to-active transition time (10
μ
s typ.)
L
V
OUT1
C
HF1
L
FIGURE 12. PRINTED CIRCUIT BOARD ISLANDS
V
OUT3
Q2
Q3
Q4
CSS
+12V
IN
+5V
SB
CIN
VIA CONNECTION TO GROUND PLANE
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT/POWER PLANE LAYER
ISL6505
DR1
V
OUT4
SS
GND
5VDLSB
3V3DLSB
KEY
5VSB
DLA
Q5
C
BULK4
L
C5VSB
L
C
HF3
C
HF4
5VDL
+5V
IN
+3.3V
IN
3V3DL
3V3
C
BULK2
C
HF2
C
BULK1
1V2VID
C
BULK3
V
OUT2
5V
FB1
Q6
V
OUT
I
OUT
ESR
OUT
t
OUT
---------------
+
ISL6505
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6505CR | Adjustable Precision Shunt Regulator 3-TO-92 -40 to 85 |
| ISL6505EVAL1 | Multiple Linear Power Controller with ACPI Control Interface |
| ISL6505EVAL2 | Multiple Linear Power Controller with ACPI Control Interface |
| ISL6506ACB-T | Multiple Linear Power Controller with ACPI Control Interface |
| ISL6506BCBZ | Multiple Linear Power Controller with ACPI Control Interface |
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| ISL6505CB-T | 功能描述:IC MULTIPLE POWER CTRLR 20-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| ISL6505CR | 功能描述:IC MULTIPLE POWER CTRLR 20-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| ISL6505CR-T | 功能描述:IC MULTIPLE POWER CTRLR 20-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| ISL6505CRZ | 功能描述:IC PWR SUPPLY CTRLR/MONITR 20QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| ISL6505CRZ-T | 功能描述:IC PWR SUPPLY CTRLR/MONITR 20QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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