- 您现在的位置：买卖IC网 > PDF目录1848 > MAX8632ETI+T (Maxim Integrated Products)IC PWR SUPPLY DDR 28-TQFN PDF资料下载
参数资料
| 型号： | MAX8632ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/29页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY DDR 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，DDR |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 1.8V，2.5V，0.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页
Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
MAX8632
TO PWM
CONTROLLER
(SEE FIGURE 1)
REF
C REF
ILIM
R A
C ILIM
R B
1.0V
LX
V DD - 1V
Figure 3. Adjustable Current-Limit Threshold
reduce the input surge currents. The MAX8632 divides
the soft-start period into five phases. During the first
I PEAK
I LOAD
phase, the controller limits the current limit to only 20%
of the full current limit. If the output does not reach reg-
ulation within 425μs, soft-start enters the second phase,
and the current limit is increased by another 20%. This
process repeats until the maximum current limit is
reached, after 1.7ms, or when the output reaches the
nominal regulation voltage, whichever occurs first.
Adding a capacitor in parallel with the external ILIM
I LOAD(MAX)
I LIMIT
resistors creates a continuously adjustable analog soft-
start function for the buck regulator’s output.
Soft-start in the LDO section can be realized by con-
(
I LIM(VAL) = 1 - LIR
2
) x I
LOAD
necting a capacitor between the SS pin and ground.
When VTT is turned off or placed in standby mode, or
during thermal shutdown of the LDOs, the SS capacitor
is discharged. When VTT is turned on or when the ther-
0
TIME
mal limit is removed, an internal 4μA (typ) current
charges the SS capacitor. The resulting ramp voltage
Figure 4. Valley Current-Limit Threshold
when OVP and shutdown discharge are disabled
(OVP/UVP = REF or GND) or forcing DL high when OVP
and shutdown discharge are enabled (OVP/UVP =
AV DD or OPEN). See Table 3 for a detailed truth table
for OVP/UVP and shutdown settings. When AV DD rises
above 4.25V, the controller activates the buck regulator
and initializes the internal soft-start.
The buck regulator’s internal soft-start allows a gradual
increase of the current-limit level during startup to
on SS linearly increases the current-limit comparator
threshold to the VTT output, until full current limit is
attained when SS reaches approximately 1.6V. This
lowering of the current limit during startup limits the ini-
tial inrush current peaks, particularly when driving
capacitors. Choose the value of the SS capacitor
appropriately to set the soft-start time window. Leave
SS floating to disable the soft-start feature.
Power-OK (POK1)
POK1 is an open-drain output for a window comparator
that continuously monitors V OUT . POK1 is actively held
______________________________________________________________________________________
15
相关PDF资料 |
PDF描述 |
|---|---|
| MAX8636ETA+T | IC REG LDO ADJ .3A 8TDFN |
| MAX8640YEXT08+T | IC REG BUCK SYNC 0.8V .5A SC70-6 |
| MAX8643AETG/V+T | IC REG BUCK SYNC ADJ 3A 24TQFN |
| MAX8643ETG+T | IC REG BUCK SYNC ADJ 3A 24TQFN |
| MAX8646ETG+T | IC REG BUCK SYNC ADJ 6A 24TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8632EVKIT | 功能描述:电源管理IC开发工具 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 |
| MAX8633ELA+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX8633ELA+T | 功能描述:低压差稳压器 - LDO Dual 300mA Pin-Prog LDO 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 |
| MAX8633ETA+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.5V TO 3V 0.3A 8TDFN EP - Rail/Tube |
| MAX8633ETA+T | 功能描述:低压差稳压器 - LDO Dual 300mA Pin-Prog LDO 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 |
发布紧急采购，3分钟左右您将得到回复。