- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383148 > ISL6455A (Intersil Corporation) Triple Output Regulator with Single Synchronous Buck and Dual LDO(帶單同步降壓和雙LDO的三路輸出調(diào)節(jié)器) PDF資料下載
參數(shù)資料
| 型號(hào)： | ISL6455A |
| 廠商： | Intersil Corporation |
| 英文描述： | Triple Output Regulator with Single Synchronous Buck and Dual LDO(帶單同步降壓和雙LDO的三路輸出調(diào)節(jié)器) |
| 中文描述： | 三單和雙同步降壓穩(wěn)壓器LDO輸出（帶單同步降壓和雙穩(wěn)壓器的三路輸出調(diào)節(jié)器） |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 320K |
| 代理商： | ISL6455A |
11
FN9196.0
December 21, 2005
the inductor. The DC resistance of the inductor will influence
directly the efficiency of the converter. Therefore, an inductor
with lowest DC resistance should be selected for highest
efficiency.
In order to avoid saturation of the inductor, the inductor
should be rated at least for the maximum output current plus
the inductor ripple current.
OUTPUT CAPACITOR SELECTION
For the best performance, a low ESR output capacitor is
needed. If an output capacitor is selected with an ESR value
≤
120m
, its RMS ripple current rating will always meet the
application requirements. The RMS ripple current is
calculated as:
V
O
V
I
f
×
2
3
×
The overall output ripple voltage is the sum of the voltage
spike caused by the output capacitor ESR plus the voltage
ripple caused by charge and discharging the output
capacitor:
V
O
V
I
f
×
Where the highest output voltage ripple occurs at the highest
input voltage.
INPUT CAPACITOR SELECTION
Because of the nature of the buck converter having a
pulsating input current, a low ESR input capacitor is required
for best input voltage filtering and minimizing the
interference with other circuits caused by high input voltage
spikes.
The input capacitor should have a minimum value of 10μF
and can be increased without any limit for better input
voltage filtering. The input capacitor should be rated for the
maximum input ripple current calculated as:
The worst case RMS ripple current occurs at D = 0.5.
Ceramic capacitors show good performance because of
their low ESR value, and because they are less sensitive to
voltage transients, compared to tantalum capacitors.
Place the input capacitor as close as possible to the input pin
of the IC for best performance.
Output Voltage Setting
The equations for the Output voltages are given below:
The output resistors should be selected so that the minimum
output load is about 200
μ
A.
Layout Considerations
As for all switching power supplies, the layout is an important
step in the design of ISL6455, ISL6455A based power
supply due to the high switching frequency and low noise
LDO implementations.
Allocate two board levels as ground planes, with many vias
between them to create a low impedance, high-frequency
plane. Tie all the device ground pins through multiple vias
each to this ground plane, as close to the device as possible.
Also tie the exposed pad on the bottom of the device to this
ground plane.
Use wide and short traces for the high current paths. The
input capacitor should be placed as close as possible to the
IC pins as well as the inductor and output capacitor. Use a
common ground node to minimize the effects of ground
noise.
TABLE 1. RECOMMENDED INDUCTORS
OUTPUT
CURRENT
INDUCTOR
VALUE
VENDOR PART #
COMMENTS
600mA
8.2
μ
H
Coilcraft
MSS6122-822MX
ISL6455
600mA
12
μ
H
Coilcraft
MSS6122-123MX
ISL6455A
TABLE 2. RECOMMENDED CAPACITORS
CAPACITOR
VALUE
ESR/m
VENDOR PART #
COMMENTS
10
μ
F
<50
TDK
C2012X5R0J106M
Ceramic
I
RMS C
O
V
O
1
-----------------
-------
–
----------------
×
×
=
V
O
V
O
1
-----------------
-------
–
8
C
O
f
×
×
-------------------------
ESR
+
×
×
=
I
RMS
I
O max
)
V
O
V
I
-------
1
V
O
V
I
-------
–
×
×
=
VOUT
Rf
-----------
Re
Rf
+
(
)
=
VOUT1
Rb
--------------
Ra
Rb
+
(
)
=
VOUT2
Rd
--------------
Rc
Rd
+
(
)
=
ISL6455, ISL6455A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6504CB | Multiple Linear Power Controller with ACPI Control Interface |
| ISL6504CB-T | Multiple Linear Power Controller with ACPI Control Interface |
| ISL6504CBNZ-T | Multiple Linear Power Controller with ACPI Control Interface |
| ISL6504ACBNZ-T | Multiple Linear Power Controller with ACPI Control Interface |
| ISL6504CBN-T | Multiple Linear Power Controller with ACPI Control Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6455AEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL6455A RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6455AIRZ | 功能描述:電流型 PWM 控制器 SYNC BUCK PWMG DLLDO 5V INP 24LD 4X4 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6455AIRZS2698 | 功能描述:IC REG TRPL SYNC DUAL LDO 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6455AIRZ-T5K | 功能描述:電流型 PWM 控制器 SYNC BUCK PWMG DLLDO 5V INP 24LD 4X4 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6455AIRZ-T5KS2698 | 功能描述:IC REG TRPL SYNC DUAL LDO 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。