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| 型号： | ISL9444IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 40-QFN |
| 标准包装： | 6,000 |
| PWM 型： | 电流模式 |
| 输出数： | 3 |
| 频率 - 最大： | 1.32MHz |
| 电源电压： | 4.5 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
Triple, 180° Out-of-Phase, Synchronous Step-Down
PWM Controller
ISL9444
The ISL9444 is a triple-output synchronous buck controller that
integrates three PWM controllers which are fully featured and
designed to provide multi-rail power for use in products such as
cable and satellite set-top boxes, VoIP gateways, cable modems,
and other home connectivity products as well as a variety of
industrial and general purpose applications. Each output is
adjustable down to 0.7V. The PWMs are synchronized at 180°
out-of-phase, thus reducing the input RMS current and ripple
voltage.
The ISL9444 offers independent power-good indicators,
programmable soft-start and tracking functions for ease of
supply rail sequencing and integrated UV/OV/OC/OT
protections in a space conscious 5mmx5mm QFN package.
Switching frequency can be set between 200kHz and 1200kHz
using a resistor. The ISL9444 can be synchronized to another
ISL9444 to reduce any beat frequency.
The ISL9444 utilizes internal loop compensation to keep
minimum peripheral components for a compact design and a
low total solution cost. These devices are implemented with
current mode control with feed-forward to cover various
applications even with fixed internal compensations.
Related Literature
? Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN (MLFP) Packages”
Features
? Three Integrated Synchronous Buck PWM Controllers
- Internal Bootstrap Diodes
- Independent Programmable Output Voltage
- Independent Power-Good Indicators, Soft-Starting and
Tracking
? Power Failure Monitor
? Light Load Efficiency Enhancement
- Low Ripple Diode Emulation Mode with Pulse Skipping
? Supports Pre-Biased Output
? Programmable Frequency: 200kHz to 1200kHz
? Adaptive Shoot-through Protection
? Out-of-Phase Switching (0°/180°/0°)
? No External Current Sense Resistor
- Uses Lower MOSFET’s r DS(ON)
? Complete Protection
- Overcurrent, Overvoltage, Over-Temperature
? Wide Input Voltage Range: 4.5V to 28V
? Pb-Free (RoHS Compliant)
Applications
? VoX Gateway Devices
? NAS/SAN Devices
? ATX Power Supplies
+12V
+
CIN1
CIN2
Q1
Q2
L2 2.2μH
VOUT2
+3.3V, 6A
0.1μF
0.1μF
+
CO2
RESN2
VOUT1
+1.0V, 6A
+
CO1
100μF
R4
15.8k ?
R3
31.6k ?
L1
1.0μH
RESN1
1.3k ?
+12V
R2
62k ?
R1
10k ?
RT
49.9k ?
C1
4.7μF
CSS
10nF
ISEN1
VIN
VCC_5V
EXTBIAS
PFI
PFO
EN2,3
FB1
RT
EN/SS1
R5
100k ?
CB1
R6
200k ?
ISL9444
R7
200k ?
CB2
ISEN2
FB2
UGATE3
BOOT3
PHASE3
LGATE3
ISEN3
CB3
0.1μF
+12V
R9
1.3k ? 11.5k ?
R8
3.09k ?
Q3
L3 3.3μH
RESN3
1.3k ?
R4
10.7k ?
R3
1.74k ?
100μF
VOUT3
+5.0V, 6A
+
CO3
100μF
FIGURE 1. TYPICAL APPLICATION
May 29, 2012
FN7665.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL9444IRZ-T7A | 功能描述:软开关 PWM 控制器 ISL9444 TRIPLE STEP DWN PWM CONTRLR RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL9444IRZ-T7AS2750 | 制造商:Intersil Corporation 功能描述:ISL9444 TRIPLE, STEP- DOWN PWM CONTROLLER IMVP-6. 40 LD MLFP - Tape and Reel |
| ISL9444IRZ-TS2750 | 制造商:Intersil Corporation 功能描述:PB FREE. ISL9444 TRIPLE, STEP- DOWN PWM CONTROLLER IMVP-6. 4 - Tape and Reel |
| ISL9491AERZ | 功能描述:线性稳压器 - 标准 SING OUTPUT LNB SUPP VAGEG FOR SATELLITE RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| ISL9491AERZ-T | 功能描述:线性稳压器 - 标准 SING OUTPUT LNB SUPP VAGEG FOR SATELLITE RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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