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参数资料
| 型号： | MAX8643ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/16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） |
3A, 2MHz Step-Down Regulator
with Integrated Switches
Typical Application Circuit
INPUT
2.4V TO 3.6V
IN
BST
C10
C6
22 μ F
C7
0.01 μ F
V DD
R5
10 Ω
MAX8643
0.1 μ F
L1
0.47 μ H
OUTPUT
1.8V, 3A
LX
V DD
C5
1 μ F
OUT
C3
560pF
C8
22 μ F
C9
0.01 μ F
CTL2
CTL1
PGND
R3
158 Ω
EN
FREQ
FB
C2
1500pF
R2
2.67k Ω
REFIN
R4
50k Ω
C4
0.022 μ F
SS
COMP
C1
33pF
V DD
R1
20k Ω
GND
Figure 1. 1MHz, All-Ceramic Capacitor Design with V OUT = 1.8V
Detailed Description
The MAX8643 high-efficiency, voltage-mode switching
regulator is capable of delivering up to 3A of output
current. The MAX8643 provides output voltages from
0.6V to (0.9 x V IN ) from 2.35V to 3.6V input supplies,
making it ideal for on-board point-of-load applications.
The output voltage accuracy is better than ±1% over
load, line, and temperature.
The MAX8643 features a wide switching frequency
range, allowing the user to achieve all-ceramic capaci-
tor designs and fast transient responses. The high oper-
ating frequency minimizes the size of external
components. The MAX8643 is available in a small (4mm
x 4mm), lead-free, 24-pin thin QFN package. The REFIN
function makes the MAX8643 an ideal candidate for
DDR and tracking power supplies. Using internal low-
R DSON (37m Ω ) n-channel MOSFETs for both high- and
low-side switches maintains high efficiency at both
heavy-load and high-switching frequencies.
The MAX8643 employs voltage-mode control architec-
ture with a high-bandwidth (> 14MHz) error amplifier.
The voltage-mode control architecture allows up to
2MHz switching frequency, reducing board area. The
op-amp voltage-error amplifier works with type 3 com-
PWRGD
pensation to fully utilize the bandwidth of the high-fre-
quency switching to obtain fast transient response.
Adjustable soft-start time provides flexibilities to mini-
mize input startup inrush current. An open-drain,
power-good (PWRGD) output goes high when V FB
reaches 90% of V REFIN or 0.54V.
Controller Function
The controller logic block is the central processor that
determines the duty cycle of the high-side MOSFET
under different line, load, and temperature conditions.
Under normal operation, where the current-limit and
temperature protection are not triggered, the controller
logic block takes the output from the PWM comparator
and generates the driver signals for both high-side and
low-side MOSFETs. The break-before-make logic and
the timing for charging the bootstrap capacitors are
calculated by the controller logic block. The error signal
from the voltage-error amplifier is compared with the
ramp signal generated by the oscillator at the PWM
comparator and, thus, the required PWM signal is pro-
duced. The high-side switch is turned on at the begin-
ning of the oscillator cycle and turns off when the ramp
voltage exceeds the V COMP signal or the current-limit
threshold is exceeded. The low-side switch is then
turned on for the remainder of the oscillator cycle.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX8645XETI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8645XETI+ | 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 |
| 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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