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參數資料
| 型號： | MAX1809 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3A, 1MHz, DDR Memory Termination Supply |
| 中文描述： | 3A、1MHz、DDR存儲器端接電源 |
| 文件頁數： | 1/17頁 |
| 文件大小： | 803K |
| 代理商： | MAX1809 |
General Description
The MAX1809 is a reversible energy flow, constant-off-
time, pulse-width modulated (PWM), step-down DC-DC
converter. It is ideal for use in notebook and subnote-
book computers that require 1.1V to 5V active
termination power supplies. This device features an
internal PMOS power switch and internal synchronous
rectifier for high efficiency and reduced component
count. The internal 90m
PMOS power switch and
70m
NMOS synchronous-rectifier switch easily deliver
continuous load currents up to 3A. The MAX1809 accu-
rately tracks an external reference voltage, produces
an adjustable output from 1.1V to V
IN
, and achieves
efficiencies as high as 93%.
The MAX1809 uses a unique current-mode, constant-
off-time, PWM control scheme that allows the output to
source or sink current. This feature allows energy to
return to the input power supply that otherwise would
be wasted. The programmable constant-off-time archi-
tecture sets switching frequencies up to 1MHz, allowing
the user to optimize performance trade-offs between
efficiency, output switching noise, component size, and
cost. The MAX1809 features an adjustable soft-start to
limit surge currents during startup, a 100% duty-cycle
mode for low-dropout operation, and a low-power shut-
down mode that disables the power switches and
reduces supply current below 1μA. The MAX1809 is
available in a 28-pin QFN with an exposed backside
pad, a 28-pin thin QFN, or a 16-pin QSOP.
Applications
DDR Memory Termination
Active Termination Buses
Features
o
Source/Sink 3A
o
±1% Output Accuracy
o
Up to 1MHz Switching Frequency
o
93% Efficiency
o
Internal PMOS/NMOS Switches
90m
/70m
On-Resistance at V
IN
= 4.5V
110m
/80m
On-Resistance at V
IN
= 3V
o
1.1V to V
IN
Adjustable Output Voltage
o
3V to 5.5V Input Voltage Range
o
<1μA Shutdown Supply Current
o
Programmable Constant-Off-Time Operation
o
Thermal Shutdown
o
Adjustable Soft-Start Inrush Current Limiting
o
Output Short-Circuit Protection
M
3A, 1MHz, DDR Memory Termination Supply
________________________________________________________________
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
IN
N.C.
LX
IN
N.C.
SS
EXTREF
PGND
PGND
LX
LX
PGND
V
CC
GND
N
N
L
N
L
N
R
G
N
N
N
F
T
TOP VIEW
THIN QFN
S
2
2
2
2
2
2
2
8
9
1
1
1
1
1
15
16
17
18
19
20
21
7
6
5
4
3
2
1
MAX1809
Pin Configurations
Ordering Information
MAX1809
IN
V
OUT
V
CC
V
IN
V
SET
SHDN
EXTREF
TOFF
LX
PGND
GND
FB
REF
SS
Typical Operating Circuit
19-2142; Rev 1; 9/02
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QFN
16 QSOP
28 Thin QFN
MAX1809EGI*
MAX1809EEE
MAX1809ETI
Pin Configurations continued at end of data sheet.
*
Contact factory for availability.
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1809EEE | 3A, 1MHz, DDR Memory Termination Supply |
| MAX1809ETI | 3A, 1MHz, DDR Memory Termination Supply |
| MAX181 | Completed ,8 Channel 12 Bits Data Acquisition System(100ksps,8通道，并行，12位A/D轉換器) |
| MAX1852 | SC70 Inverting Charge Pumps with Shutdown |
| MAX1852EXT | SC70 Inverting Charge Pumps with Shutdown |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1809EEE | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1809EEE+ | 功能描述:電壓模式 PWM 控制器 3A 1MHz DDR Memory Termination Supply RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1809EEE+T | 功能描述:電壓模式 PWM 控制器 3A 1MHz DDR Memory Termination Supply RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1809EEE-T | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1809EGI | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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