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| 型号： | MAX1809ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/17页 |
| 文件大小： | 0K |
| 描述： | IC DDR TERMINATION 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR |
| 输入电压： | 3 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 1.1 V ~ 5.5 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) |
19-2142; Rev 1; 9/02
3A, 1MHz, DDR Memory Termination Supply
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
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
Ordering Information
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.
PART
MAX1809EGI*
MAX1809EEE
MAX1809ETI
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
Applications
DDR Memory Termination
Active Termination Buses
Typical Operating Circuit
* Contact factory for availability.
Pin Configurations
TOP VIEW
V IN
IN
MAX1809
LX
PGND
V OUT
N.C.
IN
LX
1
2
3
21
20
19
PGND
PGND
LX
V CC
GND
IN
4
MAX1809
18
LX
N.C.
5
17
PGND
V SET
SHDN
EXTREF
FB
REF
SS
EXTREF
6
7
16
15
V CC
GND
TOFF
SS
THIN QFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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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