参数资料
型号: ISL9440BIRZ-T
厂商: Intersil
文件页数: 1/24页
文件大小: 0K
描述: IC REG QD BCK/LINEAR SYNC 32-QFN
产品培训模块: Solutions for Industrial Control Applications
标准包装: 6,000
拓扑: 降压(降压)同步(3),线性(LDO)(1)
功能: 任何功能
输出数: 4
频率 - 开关: 300kHz
电压/电流 - 输出 1: 控制器
电压/电流 - 输出 2: 控制器
电压/电流 - 输出 3: 控制器
带 LED 驱动器:
带监控器:
带序列发生器:
电源电压: 4.5 V ~ 24 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: *
包装: 带卷 (TR)
?
ISL9440B, ISL9440C
Data Sheet
June 24, 2010
FN6799.3
Triple Step-Down PWM and Single Linear
Controller with Programmable Soft-Start
The ISL9440B and ISL9440C are quad-output synchronous
buck controllers that integrate three PWM controllers and one
low drop-out linear regulator controller, which are full 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 0.8V. The PWMs are
synchronized at 180° out-of-phase thus, reducing the RMS
input current and ripple voltage.
The ISL9440B and ISL9440C offer programmable soft-start,
independent enable inputs for ease of supply rail
sequencing, and integrated UV/OV/OC/OT protections in a
space conscious 5mmx5mm QFN package. An early
warning function is offered to output a logic signal to warn
the system to back up data when input voltage falls below a
certain level.
The ISL9440B and ISL9440C utilize internal loop
compensation to keep minimum peripheral components for
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.
Table 1 shows the difference in terms of ISL944xx family
Features
? Three Integrated Synchronous Buck PWM Controllers
- Internal Bootstrap Diodes
- Internal Compensation
? Independent Control for each Regulator and
Programmable Output Voltages; Independent
Enable/Shutdown/Soft-start
? Fixed Switching Frequency: 300kHz(B), 600kHz(C)
? Adaptive Shoot-Through Protection on all Synchronous
Buck Controllers
? Pre-biased Output Start-up Capability
? Out-of-Phase Switching to Reduce Input Capacitance
(0°/180°/0°)
? No External Current Sense Resistor
- Uses Lower MOSFET’s r DS(ON)
? Current Mode Controller with Voltage Feed-Forward
? Complete Protection
- Overcurrent, Overvoltage, Undervoltage Lockout,
Over-Temperature
? Cycle-by-Cycle Current Limiting
? Wide Input Voltage Range
features.
PART
NUMBER
ISL9440
ISL9440A
ISL9441
ISL9440B
ISL9440C
EARLY
WARNING
Yes
Yes
No
Yes
Yes
TABLE 1.
SWITCHING
FREQUENCY
(kHz)
300
600
300
300
600
SOFT-STARTING
TIME (ms)
1.7
1.7
1.7
Programmable
Programmable
- Input Rail Powers VIN Pin: 5.6V to 24V
- Input Rail Powers VCC_5V Pin (VIN tied to VCC_5V, for
5V input applications): 4.5V to 5.6V
? Early Warning on Input Voltage Failure
? Integrated Reset Function
? Pb-Free (RoHS Compliant)
Applications
? Satellite and Cable Set-Top Boxes
? Cable Modems
? VoX Gateway Devices
? NAS/SAN Devices
? ATX Power Supply
Related Literature
? Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN (MLFP) Packages”
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009, 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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