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ISL6558EVAL2 - Low-Profile, 5V/12V Input,
500kHz, and 90% Efficiency DC/DC Converter
Application Note
April 4, 2006
AN1044.2
Author: Chun Cheung
Introduction
The changing computer performance landscape has brought
about the need for flexible power solutions. Peripheral
performance continues to increase as higher speed bus
interfaces are made available. Router designs continue to
grow in complexity as on-board processors perform more
functions within a limited board space while continuing to
increase the speed of data transfer. This places higher
power density requirements on the DC/DC converters which
supply them.
Intersil’s Endura ? multi-phase controllers (HIP63xx and
ISL65xx) and synchronous-rectified buck MOSFET drivers
(HIP66xx and ISL66xx) are suitable for the interleaved
DC/DC buck converter implementation, as shown in
Figure 1, and provide superior performance solutions with
their space economical MLFP packages.
Q1
Lo
Q2
Q1
Intersil’s ISL6558 and ISL6609
The ISL6558 controller, coupled with ISL6609 single-
channel driver ICs, forms the basic building blocks for
applications which demand high current, rapid load transient
response, and high efficiency performance at high switching
frequency within a limited board area and height.
The ISL6558 regulates output voltage and balances load
currents for two to four synchronous-rectified buck converter
channels; its internal structure is shown in Figure 2. The
internal 0.8V reference allows output voltage selection down
to that level with a 1% system accuracy over temperature.
The current-channel balance loop provides good thermal
balance among all phases. Output voltage droop or active
voltage positioning is optional. Overvoltage and overcurrent
monitors and protection functions of the IC provide a safe
environment for the microprocessor or other load. The
controller is available in a 16-lead SOIC package and a
5x5mm 2 20-lead MLFP package with some space savings.
For more detailed descriptions of the ISL6558 functionality,
refer to the device datasheet [1].
The ISL6609 is a 5V driver IC capable of delivering up to 4A
V IN
Lin
Cin
Q2
Lo
Vo
Co
of gate current for rapidly switching both MOSFETs in a
synchronous-rectified bridge; its internal structure is shown
in Figure 2. It is especially designed for voltage regulators
that require high efficiency performance at high switching
frequency within a limited board space. The ISL6609
Q1
Lo
Q2
FIGURE 1. MULTI-PHASE INTERLEAVED BUCK CONVERTER
This application note first gives a brief introduction of
Intersil’s four-phase controller ISL6558 and synchronous-
rectified driver ISL6609. A summary of the ISL6558 and
ISL6609 based design follows. The experimental results for
a low-profile 5V-to-1.35V@30A, 500kHz, and 90% efficiency
converter in two-phase operation using the interleaved
approach and with their space economical MLFP package
ICs are discussed. The evaluation board can be pushed up
to 80A in four-phase operation, or modified for 12V input
applications by replacing the input capacitors with higher
voltage rating capacitors. Term Definitions, Reference,
Schematics, Bill of Materials, and Layout are included at the
end of this application note.
accepts a single logic input to control both upper and lower
MOSFETs. Its Tri-State? feature, working together with
Intersil’s Multi-Phase PWM controllers, helps prevent a
negative transient on the output voltage when the output is
being shut down. This eliminates the Schottky diode that is
used in some systems for protecting the microprocessor
from reversed-output-voltage damage. Furthermore,
adaptive shoot-through protection is implemented on both
switching edges to provide optimal dead time and minimize
conduction losses. Bootstrap circuitry permits greater
enhancement of the upper MOSFET. The driver is available
in a 8-lead SOIC package and a space economical 3x3mm 2
8-lead MLFP package. For a more detailed description of the
ISL6609, refer to the device data sheet [2].
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. 2003, 2006. All Rights Reserved
Endura? is a trademark of Intersil Americas Inc. | Tri-State? is a registered trademark of National Semiconductor Corp.
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相关PDF资料
ISL6559EVAL2 EVALUATION BOARD 2 ISL6559
ISL6562EVAL1 EVALUATION BOARD ISL6562
ISL6594BCRZ-T IC MOSFET DVR SYNC BUCK 10-DFN
ISL6594DCRZ IC MOSFET DRVR SYNC BUCK 10-DFN
ISL6596IBZ IC MOSFET DRVR SYNC BUCK 8-SOIC
ISL6597CRZ IC MOSFET DRVR DUAL SYNC 16-QFN
ISL6605IBZ IC DRIVER MOSFET DUAL SYNC 8SOIC
ISL6608IR-T IC MOSFET DRVR SYNC BUCK 8-QFN
相关代理商/技术参数
ISL6558IB 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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)
ISL6558IB-T 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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)
ISL6558IBZ 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR)
ISL6558IBZ-T 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR)
ISL6558IR 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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)
ISL6558IR-T 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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)
ISL6558IRZ 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR)
ISL6558IRZA 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR)