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參數(shù)資料
| 型號： | MAX8632 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple 2-Input Positive-NAND Gates With Open-Drain Outputs 20-LCCC -55 to 125 |
| 中文描述： | 集成DDR電源方案，適用于臺(tái)式機(jī)、筆記本電腦和圖形卡 |
| 文件頁數(shù)： | 1/29頁 |
| 文件大?。?/td> | 512K |
| 代理商： | MAX8632 |
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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 V
TT
, and a 10mA reference
output buffer to generate V
TTR
. The buck controller drives
two external n-channel MOSFETs to generate output volt-
ages down to 0.7V from a 2V to 28V input with output cur-
rents up to 15A. The LDO can sink or source up to 1.5A
continuous and 3A peak current. Both the LDO output
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
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-
ible sequencing and standby power management using
the
SHDN
and
STBY
inputs, which support all DDR
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
Notebooks and Desknotes
Graphic Cards
Game Consoles
RAID
Networking
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
M
Integrated DDR Power-Supply Solution
for Desktops, Notebooks, and Graphic Cards
________________________________________________________________
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
PART
TEMP RANGE PIN-PACKAGE
-40
°
C to +85
°
C 28 Thin QFN 5mm
×
5mm
+
Denotes lead-free packaging.
MAX8632ETI+
Ordering Information
9
8
11
12
13
14
10
23
22
25
26
27
28
24
21
20
19
18
17
16
15
1
2
3
4
5
6
7
MAX8632
5mm x 5mm THIN QFN
TOP VIEW
GND
PGND1
D
L
V
I
O
F
REFIN
VTTI
VTT
PGND2
VTTR
VTTS
SS
P
P
I
R
O
T
B
D
AV
DD
V
DD
SHDN
SKIP
TPO
S
Pin Configuration
19-3623; Rev 0; 3/05
EVALUATION KIT
AVAILABLE
Typical Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8632ETI+ | 功能描述:PMIC 解決方案 DDR Power-Supply Solution RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX8632ETI+T | 功能描述:PMIC 解決方案 DDR Power-Supply Solution RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX8632ETI+TGD2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8632EVKIT | 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX8633ELA+ | 制造商:Maxim Integrated Products 功能描述: |
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