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| 型号： | MAX8643ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 3.2 V |
| 输入电压： | 2.35 V ~ 3.6 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
19-3970; Rev 3; 9/07
ATION
EVALU
AVAIL
KIT
ABLE
3A, 2MHz Step-Down Regulator
with Integrated Switches
General Description
The MAX8643 high-efficiency switching regulator deliv-
ers up to 3A load current at output voltages from 0.6V
to (0.9 x V IN ).The IC operates from 2.35V to 3.6V, mak-
ing it ideal for on-board point-of-load and postregula-
tion applications. Total output error is less than ±1%
over load, line, and temperature.
The MAX8643 features fixed-frequency PWM mode
operation with a switching frequency range of 500kHz
to 2MHz set by an external resistor. High-frequency
operation allows for an all-ceramic capacitor design.
The high operating frequency also allows for small-size
external components.
The low-resistance on-chip nMOS switches ensure high
efficiency at heavy loads while minimizing critical induc-
tances, making the layout a much simpler task with
respect to discrete solutions. Following a simple layout
and footprint ensures first-pass success in new designs.
The MAX8643 comes with a high-bandwidth (> 14MHz)
voltage-error amplifier. The voltage-mode control archi-
tecture and the voltage-error amplifier permit a type III
compensation scheme to be utilized to achieve maxi-
mum loop bandwidth, up to 20% of the switching fre-
Features
? Internal 37m Ω R DSON MOSFETs
? Continuous 3A Output Current
? ±1% Output Accuracy Over Load, Line,
and Temperature
? Operates from 2.35V to 3.6V Supply
? Adjustable Output from 0.6V to (0.9 x V IN )
? Soft-Start Reduces Inrush Supply Current
? 500kHz to 2MHz Adjustable Switching Frequency
? Compatible with Ceramic, Polymer, and
Electrolytic Output Capacitors
? VID-Selectable Output Voltages
0.6, 0.7, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, and 2.5V
? Fully Protected Against Overcurrent
and Overtemperature
? Sink/Source Current in DDR Application
? Lead-Free, 24-Pin, 4mm x 4mm
Thin QFN Package
Ordering Information
quency. High loop bandwidth provides fast transient
response, resulting in less required output capacitance
and allowing for all-ceramic capacitor designs.
The MAX8643 provides two tri-state logic inputs to
select one of nine preset output voltages. The preset
PART
MAX8643ETG+
TEMP
RANGE
-40°C to
+85°C
PIN-PACKAGE
24 Thin QFN-EP*
4mm x 4mm
PKG
CODE
T2444-4
output voltages allow customers to achieve ±1% out-
put-voltage accuracy without using expensive 0.1%
resistors. In addition, the output voltage can be set to
any customer value by either using two external resis-
tors at the feedback with 0.6V internal reference or
+Denotes lead-free package.
*EP = Exposed pad.
Typical Operating Circuit
applying an external reference voltage to the REFIN
input. The MAX8643 offers programmable soft-start
time using one capacitor to reduce input inrush current.
INPUT
2.4V, 3.6V
IN
BST
The MAX8643 is available in a lead-free, 24-pin, 4mm x
4mm thin QFN package.
Applications
EN
V DD
MAX8643
LX
OUT
OUTPUT
1.8V, 3A
POLs
ASIC/CPU/DSP Core and I/O Voltages
CTL1
PGND
DDR Power Supplies
Base-Station Power Supplies
CTL2
FREQ
FB
Telecom and Networking Power Supplies
REFIN
SS
COMP
V DD
RAID Control Power Supplies
Pin Configuration appears at end of data sheet.
GND
PWRGD
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
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| MAX8643EVKIT+ | 功能描述:电源管理IC开发工具 MAX8643 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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| MAX8645XETI+T | 功能描述:LED照明驱动器 1x/1.5x/2x White LED Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8645YETI+ | 功能描述:LED照明驱动器 1x/1.5x/2x White LED Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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