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參數(shù)資料
| 型號： | ISL6444CA |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual PWM Controller with DDR Memory Option for Gateway Applications |
| 中文描述： | DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.150 INCH, PLASTIC, QSOP-28 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大?。?/td> | 440K |
| 代理商： | ISL6444CA |
1
FN9069.1
ISL6444
Dual PWM Controller with DDR Memory
Option for Gateway Applications
The ISL6444 PWM controller provides high efficiency and
regulation for two output voltages adjustable in the range from
0.9V to 5.5V that are required to power I/O, chip-sets, and
memory banks in high-performance notebook computers,
PDAs, and Internet appliances.
Synchronous rectification and hysteretic operation at light
loads contribute to a high efficiency over a wide range of
loads. The hysteretic mode of operation can be disabled
separately on each PWM converter if continuous conduction
operation is desired for all load levels. Efficiency is even
further enhanced by using MOSFET’s R
DS(ON)
as a current
sense component.
Feed-forward ramp modulation, current mode control
scheme, and internal feed-back compensation provide fast
response to load transients. Out-of-phase operation with a
180
o
phase shift reduces the input current ripple.
The controller can be transformed in a complete DDR
memory power supply solution by activating a DDR pin. In
DDR mode of operation one of the channels tracks the
output voltage of another channel and provides output
current sink and source capability–features essential for
proper powering of DDR chips. The buffered reference
voltage required by this type of memory is also provided.
The ISL6444 monitors the output voltages. Each PWM
controller generates a PGOOD (power good) signal when
the soft-start is completed and the output is within ±10% of
the set point.
A built-in overvoltage protection prevents output voltage
from going above 115% of the set point. Normal operation
automatically restores when the overvoltage conditions go
away. Undervoltage protection latches the chip off when
either output drops below 75% of its set value after the soft-
start sequence for this output is completed. An adjustable
overcurrent function monitors the output current by sensing
the voltage drop across the lower MOSFET. If precision
current-sensing is required, an external current-sense
resistor may optionally be used.
The IC comes in a 28 lead SSOP package.
Features
Provides regulated output voltage in the range 0.9V–5.5V
- High efficiency over wide load range
- Synchronous buck converter with hysteretic operation at
light load
Complete DDR memory power solution
- VTT tracks VDDQ/2
- VDDQ/2 buffered reference output
No current-sense resistor required
- Uses MOSFET’s R
DS(ON)
- Optional current-sense resistor for precision overcurrent
Undervoltage lock-out on VCC pin
Dual mode operation
- Operates directly from battery 5.0-24V input
- Operates from 3.3V or 5V system rail
Excellent dynamic response
- Combined voltage feed-forward and current mode
control
Power-good signal for each channel
300kHz switching frequency
- Out-of-phase operation for reduced input ripple
- In-phase operation in DDR mode for reduced channel
interference
- Out-of-phase operation with 90
o
phase shift for two-
stage conversion in DDR mode
Applications
Residential and Enterprise Gateways
DSL Modems
Routers and Switchers
Pinout
Ordering Information
PART NUMBER
TEMP. (
o
C)
PACKAGE
PKG. NO.
ISL6444CA
-10 to 85
28 Ld SSOP
M28.15
ISL6444CA-T
-10 to 85
28 Ld SSOP
Taped and
Reeled
M28.15
EN1
GND
DDR
VSEN1
VIN
PG1
26
25
24
23
22
21
1
2
3
4
5
6
7
8
ISL6444 (SSOP-28)
VCC
27
28
VOUT1
9
10
11
12
13
14
18
17
16
15
19
20
ISEN1
LGATE1
PGND1
BOOT1
UGATE1
PHASE1
ISEN2
LGATE2
PGND2
BOOT2
UGATE2
PHASE2
EN2
VSEN2
VOUT2
OCSET2
OCSET1
SOFT1
SOFT2
PG2/REF
Data Sheet
May 2002
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2002. All Rights Reserved
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6444CA-T | Triple 3-Input Positive-AND Gates 14-SOIC -40 to 85 |
| ISL6526A | Single Synchronous Buck Pulse-Width Modulation (PWM) Controller(單同步降壓PWM控制器) |
| ISL6534 | PWM Control Circuit 16-SO 0 to 70 |
| ISL6534CR | PWM Control Circuit 16-TSSOP 0 to 70 |
| ISL6534CRZ | PWM Control Circuit 16-TSSOP 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6444CA-T | 功能描述:IC CONTROLLER DDR 28-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| ISL6444CAZ | 功能描述:IC CONTROLLER DDR 28-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝: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 |
| ISL6444CAZT | 制造商:Intersil Corporation 功能描述: |
| ISL6444CAZ-T | 功能描述:IC CONTROLLER DDR 28-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝: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 |
| ISL6445EVAL3Z | 功能描述:EVALUATION BOARD FOR ISL6445 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標準包裝: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)壓器拓撲結(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 |
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