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参数资料
| 型号： | MAX1917EEE |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | QSOP-16 |
| 文件页数： | 12/18页 |
| 文件大小： | 336K |
| 代理商： | MAX1917EEE |
M
Tracking, Sinking and Sourcing, Synchronous Buck
Controller for DDR Memory and Termination Supplies
12
______________________________________________________________________________________
high-side FET from turning on until DL is fully off. There
must be a low-resistance, low-inductance path from the
DL driver to the MOSFET gate in order for the adaptive
dead-time circuit to work properly. Otherwise, the
sense circuitry in the MAX1917 interprets the MOSFET
gate as off while there is actually still charge left on the
gate. Use very short, wide traces measuring 10
squares to 20 squares (50mils to 100mils wide if the
MOSFET is 1in from the MAX1917). The dead time at
the other edge (DH turning off) is determined by a fixed
35ns (typ) internal delay. The internal pulldown transis-
tor that drives DL low is robust, with a 0.5
(typ) on-
resistance. This helps prevent DL from being pulled up
during the fast rise time of the inductor node, due to
capacitive coupling from the drain to the gate of the
massive low-side synchronous-rectifier MOSFET. Some
combinations of high- and low-side FETs may be
encountered that cause excessive gate-drain coupling,
which can lead to efficiency-killing, EMI-producing
shoot-through currents. This can often be remedied by
adding a resistor (R
BST
) in series with BST, which
increases the turn-on time of the high-side FET without
degrading the turn-off time (Figure 2).
POK
V+
DDR
EN/HSD
REF
GND
ILIM
VTT
VTTR
PGND
VL
BST
DH
LX
DL
FSEL
2.5V
C2
2 x 330
μ
F
6V
C1
1
μ
F
6.3V
C8
0.47
μ
F/10V
V+
V
DDR
PGND
C3
4.7
μ
F
10V
C4
0.47
μ
F
10V
C7
1
μ
F/6.3V
C9
0.47
μ
F/25V
2.5V
5.5V TO 14V
1.25V AT 7A
L1
0.68
μ
H/9A
IRF7463
6 x 270
μ
F
Q2
Q1
IRF7463
D1
CMPSH-3
Q3
2N7002K
R3
20k
R2
5.1k
VL
VL
SHDN
POK
VL
OUTPUT CAPACITORS ARE SELECTED TO COMPLY WITH JEDEC SPECIFICATIONS.
C6
2V
C5
2 x 10
μ
F
6.3V
V
OUT
V
IN
VTTR
MAX1917
3
10
2
1
7
5
6
8
11
14
15
16
12
13
4
9
Figure 3. Typical Application Circuit for 1.25V at 7A Output
Typical Application Circuits
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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 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: |
| MAX1917EVKIT | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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