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| 型号： | MAX1917EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/18页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR SYNC BUCK 16-QSOP |
| 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： | 4.5 V ~ 22 V |
| 输出数： | 2 |
| 输出电压： | 0.4 V ~ 5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
19-2335; Rev 1; 6/02
Tracking, Sinking and Sourcing, Synchronous Buck
Controller for DDR Memory and Termination Supplies
General Description
The MAX1917 provides a complete power-manage-
ment solution for DDR memory. It contains a synchro-
nous buck controller and an amplifier to generate
1/2V DDR voltage for VTT and VTTR. The VTT and VTTR
voltages are maintained within 1% of 1/2V DDR . The
controller operates in synchronous rectification mode to
ensure balanced current sourcing and sinking capabili-
ty of up to 25A. With a shutdown current of less than
5μA, the MAX1917 is the best choice for low-power
notebook applications, as well as servers and desktop
computers. An all N-FET design optimizes efficiency.
The MAX1917 can also be used for generating V DDR
and as a general-purpose step-down controller with
variable switching frequency as high as 1MHz with few
additional components.
The MAX1917 uses Maxim’s proprietary Quick-PWM?
architecture for fast transient response up to 96% effi-
ciency, and the smallest external components. Output
current monitoring is achieved without sense resistors
by monitoring the bottom FET’s drain-to-source voltage.
The current-limit threshold is programmable through an
external resistor. The MAX1917 comes in a space-sav-
ing 16-pin QSOP package.
Applications
Features
o 25A Sourcing and Sinking Current
o Automatically Sets VTT to 1/2V DDR
o VTT and VTTR Within 1% of 1/2V DDR
o Smallest Output Capacitors
o 4.5V to 14V (or 28V with Resistor-Divider) Input
Voltage Range
o 1.5V to 3.6V Input DDR Range
o 200kHz/300kHz/400kHz/550kHz Preset Switching
Frequencies
o Variable Switching Frequency of Up to 1MHz
o Overcurrent Protection Without Current-Sense
Resistor
o Internal Soft-Start
o VTTR Reference Sources and Sinks Up to 25mA
o Quick-PWM Control for Fastest Loop Response
o Up to 96% Efficiency
o 16-Pin QSOP Package
DDR Memory Power
Supply
Notebook Computers
Desktop Computers
Ordering Information
Processor or DSP Core
Supply
Storage
Networking Systems
PART
MAX1917EEE
TEMP RANGE
-40 ° C to +85 ° C
PIN-PACKAGE
16 QSOP
AGTL Bus Termination
Supply
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
V IN (2.5V TO 15V)
Typical Operating Circuit
TOP VIEW
Pin Configuration
POK
VDDR
EN/HSD
POK
DH
VL
V OUT
EN/HSD 1
16 LX
DDR
MAX1917
BST
(4.5V TO 14V)
DDR 2
POK 3
VTT 4
MAX1917EEE
15 DH
14 BST
13 PGND
V+
REF
LX
DL
ILIM 5
FSEL 6
12 DL
11 VL
VL
ILIM
FSEL
PGND
VTT
REF 7
GND 8
10 V+
9
VTTR
GND
VTTR
VTTR
QSOP
________________________________________________________________ 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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