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| 型号： | MAX8550ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/29页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUP DDR INTEG 28TQFN |
| 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： | 2 V ~ 28 V |
| 输出数： | 2 |
| 输出电压： | 1.8V，2.5V，0.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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MAX8550/MAX8551
Integrated DDR Power-Supply Solutions for
Desktops, Notebooks, and Graphic Cards
+5V BIAS
SUPPLY
AV DD
V DD
IN
BST
V IN
MAX8550/
MAX8551
DH
R POS
VOLTAGE-
POSITIONED
OUTPUT
LX
DL
PGND1
GND
FB
Figure 9. Voltage-Positioned Output
OUT
PC Board Layout Guidelines
Careful PC board layout is critical to achieve low
switching losses and clean, stable operation. The
switching power stage requires particular attention. If
possible, mount all of the power components on the top
side of the board, with their ground terminals flush
against one another. Follow these guidelines for good
PC board layout:
? Keep the high-current paths short, especially at the
ground terminals. This practice is essential for sta-
ble, jitter-free operation.
? Keep the power traces and load connections short.
This practice is essential for high efficiency. Using
thick copper PC boards (2oz vs. 1oz) can enhance
full-load efficiency by 1% or more. Correctly routing
PC board traces is a difficult task that must be
approached in terms of fractions of centimeters,
where a single m ? of excess trace resistance caus-
es a measurable efficiency penalty.
? The LX and PGND1 connections to the low-side
MOSFET for current sensing must be made using
Kelvin-sense connections.
? When trade-offs in trace lengths must be made, it is
preferable to allow the inductor-charging path to be
made longer than the discharge path. For example,
it is better to allow some extra distance between the
input capacitors and the high-side MOSFET than to
allow distance between the inductor and the low-
26
side MOSFET or between the inductor and the out-
put filter capacitor.
? Route high-speed switching nodes (BST, LX, DH,
and DL) away from sensitive analog areas (REF, FB,
and ILIM).
? Input ceramic capacitors must be placed as close
as possible to the high-side MOSFET drain and the
low-side MOSFET source. Position the MOSFETs so
the impedance between the input capacitor termi-
nals and the MOSFETs is as low as possible.
Special Layout Considerations for LDO Section
The capacitor (or capacitors) at VTT should be placed
as close to VTT and PGND2 (pins 12 and 11) as possi-
ble to minimize the series resistance/inductance of the
trace. The PGND2 side of the capacitor must be short
with a low-impedance path to the exposed pad under-
neath the IC. The exposed pad must be star-connected
to GND (pin 24), PGND1 (pin 23), and PGND2 (pin 11).
A narrower trace can be used to connect the output
voltage on the VTT side of the capacitor back to VTTS
(pin 9). However, keep this trace well away from poten-
tially noisy signals such as PGND1 or PGND2. This
prevents noise from being injected into the error ampli-
fier ’s input. For best performance, the VTTI bypass
capacitor must be placed as close to VTTI (pin 13) as
possible. REFIN (pin 14) should be separately routed
with a clean trace and adequately bypassed to GND.
Refer to the MAX8550 evaluation kit data sheet for PC
board guidelines.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8550EVKIT | 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 |
| MAX8551ETI | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8551ETI+ | 制造商:Maxim Integrated Products 功能描述:INTEGRATED DDR POWER-SUPPLY SOLUTIONS FOR DESKTOPS, NOTEBOOK - Rail/Tube |
| MAX8551ETI+T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8551ETI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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