参数资料
型号: MAX8744AETJ+
厂商: Maxim Integrated Products
文件页数: 18/36页
文件大小: 0K
描述: IC CNTRLR PWR SUP QUAD 32TQFN
标准包装: 60
应用: 控制器,笔记本电脑电源系统
输入电压: 6 V ~ 26 V
输出数: 4
输出电压: 3.3V,5V,1 V ~ 26 V
工作温度: 0°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-WFQFN 裸露焊盘
供应商设备封装: 32-TQFN-EP(5x5)
包装: 管件
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
making the threshold to exit shutdown less accurate. To
guarantee startup, drive SHDN above 2V ( SHDN input
rising-edge trip level). For automatic shutdown and
startup, connect SHDN to V IN . The accurate 1V falling-
edge threshold on SHDN can be used to detect a spe-
cific input voltage level and shut the device down. Once
in shutdown, the 1.6V rising-edge threshold activates,
SMPS POR, UVLO, and Soft-Start
Power-on reset (POR) occurs when LDO5 rises above
approximately 1V, resetting the undervoltage, overvolt-
age, and thermal-shutdown fault latches. The POR cir-
cuit also ensures that the low-side drivers are pulled
high until the SMPS controllers are activated. Figure 2 is
the MAX8744A/MAX8745A block diagram.
providing sufficient hysteresis for most applications.
IN
5V LINEAR
SHDN
FSEL
ILIM
OSC
REGULATOR
LDO BYPASS
CIRCUITRY
LDO5
SKIP
CSH5
CSH3
CSL3
LDO5
CSL5
BST3
DH3
LX3
LDO5
PWM3
CONTROLLER
(FIGURE 3)
PWM5
CONTROLLER
(FIGURE 3)
LDO5
BST5
DH5
LX5
DL5
DL3
PGND
ON5
INTERNAL
FB3
FB
DECODE
(FIGURE 5) FB
FB
DECODE
(FIGURE 5)
FB5
ON3
PGOOD5
2.0V
REF
PGOOD3
R
REF
R
GND
POWER-GOOD AND FAULT
PROTECTION
PGOODA
(FIGURE 6)
MAX8744A
AUXILIARY
LINEAR REGULATOR
DRVA
OUTA
FBA
ONA
MAX8745A
Figure 2. Block Diagram
18
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