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WLAN - 802.11 Chipset Power Supply
Implementation Using the ISL6413
PRELIMINARY
Application Note
October 2003
AN1081.1
Author: Manisha Pandya
ISL6413 Triple Output Regulator with
Single Synchronous Buck and Dual LDO
The ISL6413 is a highly integrated triple output regulator
which provides a single chip solution for wireless chipset
power management. The device integrates a high efficiency
synchronous buck regulator with two ultra low noise LDO
regulators and a RESET. It accepts an input voltage range of
3.0V to 3.6V and provides three regulated output voltages:
1.8V (PWM), 2.84V (LDO1), and another ultra low noise
2.84V (LDO2). The PWM output maintains regulator down to
2.7V input voltage.
Quick Start Evaluation
The evaluation board is shipped “ready to use” right from the
box. The board accepts a 3.3V input from a standard power
supply. The output can be exercised through the use of an
external load.
There are posts available on the board for introducing power,
for drawing current from the regulated output, and also for
testing other functions like RESET, SYNC, Power Good and
Shutdown.
Recommended Test Equipment
The PWM regulator is a current mode control synchronous
buck regulator with integrated N- and P- channel power
MOSFETs. It’s output is pre-set to 1.8V for the BBP/MAC
core supply. Synchronous rectification with internal
MOSFETs achieves >92% efficiency. The operating
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A 3.3V, 2A capable power supply
An electronic load 3 channels
A four-channel oscilloscope
Precision digital multimeters
frequency is typically 750kHz allowing the use of smaller
inductor and capacitor values. The device can be
synchronized to an external clock signal in the range of
500kHz to 1MHz. The PG_PWM output indicates any loss of
regulation on the PWM output.
The ISL6413 also has two LDO regulators which use internal
PMOS transistors as the pass devices. LDO2 features ultra
low noise that typically does not exceed 30μV RMS to aid
VCO stability. The EN_LDO pin controls LDO1 and LDO2
outputs. The ISL6413 also integrates a RESET function,
eliminating the need for an additional RESET IC usually
required in WLAN applications. This function asserts a
RESET signal whenever the VIN supply voltage drops below
a preset threshold, keeping it asserted for at least 25ms after
VIN has risen above the reset threshold. The PG_LDO
output indicates loss of regulation on either of the two LDO
outputs. Additional features include over current protection
for all three outputs and thermal shutdown.
High integration , excellent efficiency and the thin, Quad Flat
No-lead (QFN) package makes the ISL6413 an ideal choice
to power many of today’s small form factor industry standard
wireless cards such as PCMCIA, mini-PCI and Cardbus-32.
ISL6413 Reference Design
The ISL6413 evaluation board highlights the operation of the
IC in an embedded application.
Power and Load Connections
There are 2 sets of terminals that are used for supplying the
input power and 3 sets of terminals used for loading the 3
outputs (1 PWM and 2 Linear regulators).
Input Voltage - Connect the positive lead of the power
supply to V IN (P1) post and V IN _LDO (P11) post and the
ground lead of the supply to the PGND (P2) post and the
GND_LDO (P10) post.
Output Loading, Sourcing Current - To load the PWM
output, connect the positive lead of the electronic load to the
V OUT (P6) post and the return terminal of the same load
channel to the PGND (P7) post. Similarly, connect the
positive terminal of the second load channel to the
V OUT1 (P9) post and the return terminal to the GND_LDO
(P12) post to load the output of LDO1. The ultra low noise
LDO2 output can be loaded by connecting the positive
terminal of a third channel of the electronic load to the
V OUT2 (P8) post and the return terminal to the GND_LDO
(P12) post.
Startup
There are two distinct start up methods for the ISL6413. The
first method is by the application of power to the inputs of the
IC. A controlled turn on of the outputs is allowed by the soft-
start feature of the IC. The soft start duration for the PWM is
TABLE 1. EVALUATION BOARDS
BOARD NAME IC
PACKAGE
typically 5.5ms with 750kHz switching frequency. The soft-
start duration for LDOs is 120μs.
ISL6413EVAL1
ISL6413IR
24 Ld QFN
1
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright ? Intersil Americas Inc. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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相关代理商/技术参数
ISL6413IR 功能描述:IC REG TRPL BCK/LINEAR 24-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 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:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:*
ISL6413IR-T5K 功能描述:IC REG TRPL BCK/LINEAR 24-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 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:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:*
ISL6413IR-TK 功能描述:IC REG TRPL BCK/LINEAR 24-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 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:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:*
ISL6413IRZ 功能描述:IC REG TRPL BCK/LINEAR 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 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:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:*
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ISL6414EVAL1 功能描述:EVAL BOARD 1 FOR ISL6414 RoHS:否 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:* 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS
ISL6414IR 制造商:Rochester Electronics LLC 功能描述:TRIPLE OUTPUT LOW DROPOUT LINEAR REG. WITH FAULT PIN MODIFIC - Bulk 制造商:Intersil Corporation 功能描述:
ISL6414IRZ 功能描述:低压差稳压器 - LDO VER OF ISL6414IR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20