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参数资料
| 型号： | MAX1761EEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 428kHz |
| 电源电压： | 4.5 V ~ 20 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
Small, Dual, High-Efficiency
Buck Controller for Notebooks
switching noise away from the IC, feedback
1.8V
OUT1
FIXED
2.5V
TO ERROR
AMP1
TO ERROR FIXED
AMP2
OUT2
?
dividers, and analog bypass capacitors.
Avoid coupling switching noise into control input
connections (ON1, ON2, etc.). These pins should
be referenced to a quiet analog ground plane.
Layout Procedure
1) Place the power components first, with ground ter-
FB1
FB2
minals adjacent (Q2 source, CI N_ , C OUT_ ). If possi-
ble, make all these connections on the top layer
with wide, copper-filled areas.
0.1V
MAX1761
0.1V
2) Mount the controller IC adjacent to the synchronous
rectifier MOSFETs, preferably on the back side in
order to keep CS_, PGND_, and the DL_ gate-drive
Figure 11. Feedback MUX
DH
V+
line short and wide. The DL_ gate trace must be
short and wide, measuring 10 to 20 squares (50mils
to 100mils wide if the MOSFET is 1 inch from the
controller IC).
3) Place the VL capacitor near the IC controller.
4) Make the DC-DC controller ground connections as
1/2
MAX1761
CS
DL
GND
OUT
R1
V OUT
follows: near the IC, create a small analog ground
plane. Use this plane for the ground connection for
the REF and VL bypass capacitor, and FB_
dividers. Create another small ground island for
PGND, and use it for the V+ bypass capacitor,
placed very close to the IC. Connect the AGND and
the PGND together under the IC (this is the only
FB
R2
Figure 12. Setting V OUT with a Resistive Voltage-Divider
connection between AGND and PGND).
5) On the board ’ s top side (power planes), make a
star ground to minimize crosstalk between the two
sides. The top-side star ground is a star connection
of the input capacitors, side 1 low-side MOSFET,
and side 2 low-side MOSFET. Keep the resistance
low between the star ground and the sources of the
low-side MOSFETs for accurate current limit.
?
?
?
When trade-offs in trace lengths must be made, it ’ s
preferable to allow the inductor charging path to be
made longer than the discharge path. For example,
it ’ s 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-
side MOSFET or between the inductor and the out-
put filter capacitor.
Ensure that the OUT connection to C OUT is short
and direct. However, in some cases it may be
desirable to deliberately introduce some trace
length between the OUT inductor node and the out-
put filter capacitor (see Stability Considerations ).
Route high-speed switching nodes (CS_, DH_, and
DL_) away from sensitive analog areas (REF, FB_).
Use a PGND as an EMI shield to keep radiated
Connect the top-side star ground (used for MOS-
FET, input, and output capacitors) to the small
PGND island with a short, wide connection (prefer-
ably just a via). If multiple layers are available (high-
ly recommended), create PGND1 and PGND2
islands on the layer just below the top-side layer
(refer to the MAX1761 EV kit for an example) to act
as an EMI shield. Connect each of these individual-
ly to the star ground via, which connects the top
side to the PGND plane. Add one more solid
ground plane under the IC to act as an additional
shield, and also connect that to the star ground via.
6) Connect the output power planes directly to the out-
put filter capacitor positive and negative terminals
with multiple vias.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1761EEE+ | 功能描述:DC/DC 开关控制器 Dual Buck Controller 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 |
| MAX1761EEE+T | 功能描述:DC/DC 开关控制器 Dual Buck Controller 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 |
| MAX1761EEE-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 |
| MAX1761EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1761 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 |
| MAX1762EUB | 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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