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参数资料
| 型号： | MAX1917 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies |
| 中文描述： | 跟踪、可吸入/源出电流、同步buck控制器，用于DDR存储器及端接电源 |
| 文件页数： | 8/18页 |
| 文件大小： | 336K |
| 代理商： | MAX1917 |
Pin Description
M
Tracking, Sinking and Sourcing, Synchronous Buck
Controller for DDR Memory and Termination Supplies
8
_______________________________________________________________________________________
CURRENT LIMIT vs. TEMPERATURE
M
TEMPERATURE (
°
C)
C
80
60
20
40
0
-20
2
4
6
8
10
12
14
16
18
0
-40
100
R
ILIM
= 402k
R
ILIM
= 200k
M
V
IN
(V)
I
13
11
9
7
5
3
10
12
14
16
18
8
1
15
INDUCTOR PEAK AND VALLEY CURRENT
vs. INPUT VOLTAGE AT CURRENT LIMIT
I
PEAK
I
VALLEY
CIRCUIT OF FIGURE 3
R
ILIM
= 400k
Typical Operating Characteristics (continued)
(V+ = 12V, V
OUT
= 1.25V, T
A
= +25
°
C, unless otherwise noted.)
PIN
NAME
FUNCTION
1
EN/HSD
Enable/High-Side Drain. Connect to the high-side N-FET drain for normal operation. Leave unconnected or
connect to GND for low-power shutdown.
2
DDR
DDR Reference Input. An applied voltage at DDR sets V
VTT
and V
VTTR
to 1/2V
DDR
. DDR voltage range is
from 0 to 3.6V.
Power-OK Output. POK is an open-drain output and is logic high when both VTT and VTTR are within 12%
of regulation. POK is pulled low in shutdown.
VTT Feedback Input. Connect to VTT output.
Current-Limit Threshold Adjustment. Connect a resistor from ILIM to GND to set the current-limit threshold,
or connect ILIM to VL for default setting. See the
Setting the Current Limit
section.
Frequency Select. Selects the switching frequency of the MAX1917. See Table 1 for configuration of FSEL.
Reference Bypass. Connect a 0.22μF or larger capacitor from REF to GND.
Ground
VTTR Reference Output. Connect a 1μF or larger capacitor from VTTR to GND. VTTR is capable of
sourcing and sinking up to 25mA.
3
POK
4
VTT
5
ILIM
6
7
8
FSEL
REF
GND
9
VTTR
10
V+
Input Supply Voltage. Supply input for the VL regulator and the VTTR regulator. Bypass with a 0.22μF or
larger capacitor.
11
VL
Internal Regulator Output. Connect a 2.2μF or larger capacitor from VL to GND. VL can be connected to
V+ if the operating range is 4.5V to 5.5V.
Low-Side MOSFET Gate Drive. Connect to the gate of the low-side N-channel MOSFET.
Power Ground
Bootstrapped Supply to Drive High-Side N-Channel MOSFET. Connect a 0.47μF or larger capacitor from
BST to LX.
High-Side MOSFET Gate Drive. Connect to the high-side N-channel MOSFET gate.
Inductor Switching Node
12
13
DL
PGND
14
BST
15
16
DH
LX
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1917EEE | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE+ | 功能描述:直流/直流开关转换器 Track/Sink/Source Synchronous Buck RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE+T | 功能描述:直流/直流开关转换器 Track/Sink/Source Synchronous Buck RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE-T | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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