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| 型号： | MAX8632ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/29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) |
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19-3623; Rev 1; 10/05
ATION
AILABL
EVALU E
AV
KIT
Integrated DDR Power-Supply Solution
for Desktops, Notebooks, and Graphic Cards
General Description
The MAX8632 integrates a synchronous-buck PWM con-
troller to generate V DDQ , a sourcing and sinking LDO lin-
ear regulator to generate VTT, and a 10mA reference
output buffer to generate VTTR. The buck controller dri-
ves two external n-channel MOSFETs to generate output
voltages down to 0.7V from a 2V to 28V input with output
currents up to 15A. The LDO can sink or source up to
1.5A continuous and 3A peak current. Both the LDO out-
put and the 10mA reference buffer output can be made
to track the REFIN voltage. These features make the
MAX8632 ideally suited for DDR memory applications in
desktops, notebooks, and graphic cards.
The PWM controller in the MAX8632 utilizes Maxim’s
proprietary Quick-PWM? architecture with programma-
ble switching frequencies of up to 600kHz. This control
scheme handles wide input/output voltage ratios with
ease and provides 100ns response to load transients
while maintaining high efficiency and a relatively con-
stant switching frequency. The MAX8632 offers fully pro-
grammable UVP/OVP and skip-mode options ideal in
portable applications. Skip mode allows for improved
efficiency at lighter loads.
The VTT and VTTR outputs track to within 1% of V REFIN / 2.
The high bandwidth of this LDO regulator allows excel-
lent transient response without the need for bulk capac-
itors, thus reducing cost and size.
The buck controller and LDO regulators are provided with
independent current limits. Adjustable lossless foldback
current limit for the buck regulator is achieved by monitor-
ing the drain-to-source voltage drop of the low-side
MOSFET. Additionally, overvoltage and undervoltage pro-
tection mechanisms are built in. Once the overcurrent
Features
Buck Controller
? Quick-PWM with 100ns Load-Step Response
? Up to 95% Efficiency
? 2V to 28V Input Voltage Range
? 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output
? Up to 600kHz Selectable Switching Frequency
? Programmable Current Limit with Foldback
Capability
? 1.7ms Digital Soft-Start
? Independent Shutdown and Standby Controls
? Overvoltage-/Undervoltage-Protection Option
? Power-Good Window Comparator
LDO Section
? Fully Integrated VTT and VTTR Capability
? VTT Has ±3A Sourcing/Sinking Capability
? Only 20μF Ceramic Capacitance Required for VTT
? VTT and VTTR Outputs Track V REFIN / 2
? All-Ceramic Output-Capacitor Designs
? 1.0V to 2.8V Input Voltage Range
? Power-Good Window Comparator
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX8632ETI+ -40 ° C to +85 ° C 28 Thin QFN-EP* 5mm × 5mm
+ Denotes lead-free packaging.
* EP = Exposed pad.
Pin Configuration
condition is removed, the regulator is allowed to enter
soft-start again. This helps minimize power dissipation
during a short-circuit condition. The MAX8632 allows flex-
TOP VIEW
21
20
19
18
17
16
15
ible sequencing and standby power management using
the SHDN and STBY inputs, which support all DDR
V DD
PGND1
22
23
14
13
REFIN
VTTI
operating states.
The MAX8632 is available in a small 5mm × 5mm, 28-
pin thin QFN package.
Applications
DDR I and DDR II Memory Power Supplies
Desktop Computers
GND
SKIP
AV DD
SHDN
TPO
24
25
26
27
28
MAX8632
12
11
10
9
8
VTT
PGND2
VTTR
VTTS
SS
Notebooks and Desknotes
1
2
3
4
5
6
7
Graphic Cards
Game Consoles
RAID
Networking
5mm x 5mm THIN QFN
Typical Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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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 |
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