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参数资料
| 型号： | MAX8561ETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.5A 8TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 2.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 4MHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in Thin SOT and TDFN
INPUT
Li+ BATTERY
OUTPUT
INPUT
Li+ BATTERY
2.2 μ F
IN
GND
MAX8561
LX
FB
120k ?
2.2 μ H
100k ?
220pF
1.5V OR 1.0V
AT 500mA
2.2 μ F
2.2 μ F
IN
GND
PFET
ODO
MAX8562
LX
1.5 μ H
100k ?
OUTPUT
1.2V OR V BATT
2.2 μ F
ON/OFF
1.5/1.0
SHDN
ODI
PGND
ODO
150k ?
ON/OFF
SHDN
FB
150pF
100k ?
HP = HIGH-POWER MODE
HP/LP
ODI
PGND
LP = LOW-POWER MODE
Figure 2. Using ODI/ODO to Obtain Two Output Voltages from
the MAX8561
Capacitor Selection
Output Capacitor
The output capacitor, C OUT , is required to keep the
output voltage ripple small and to ensure regulation
loop stability. C OUT must have low impedance at the
Figure 3. Using the MAX8562 to Control an External Bypass
PFET for a Two-Step V CC in CDMA-PA Applications
Feed-Forward Capacitor
The feed-forward capacitor, C FF , sets the feedback loop
response, controls the switching frequency, and is criti-
cal in obtaining the best efficiency possible. Choose a
small ceramic X7R capacitor with a value given by:
switching frequency. Ceramic capacitors with X5R or
X7R dielectrics are highly recommended due to their
small size, low ESR, and small temperature coefficients.
C FF =
L
R 1
× 10 Siemens
Due to the unique feedback network, the output capac-
itance can be very low. For most applications, a 2.2μF
capacitor is sufficient. For optimum load-transient per-
formance and very low output ripple, the output capaci-
tor value in μFs should be equal to or larger than the
inductor value in μHs.
Input Capacitor
The input capacitor, C IN , reduces the current peaks
drawn from the battery or input power source and
reduces switching noise in the IC. The impedance of
C IN at the switching frequency should be kept very low.
Ceramic capacitors with X5R or X7R dielectrics are
highly recommended due to their small size, low ESR,
and small temperature coefficients. Due to the
MAX8560/MAX8561/MAX8562s ’ soft-start, the input
capacitance can be very low. For most applications, a
2.2μF capacitor is sufficient.
Select the closest standard value to C FF as possible.
PC Board Layout and Routing
High switching frequencies and relatively large peak cur-
rents make the PC board layout a very important part of
design. Good design minimizes excessive EMI on the
feedback paths and voltage gradients in the ground
plane, both of which can result in instability or regulation
errors. Connect C IN close to IN and GND. Connect the
inductor and output capacitor as close to the IC as pos-
sible and keep their traces short, direct, and wide.
Connect GND and PGND separately to the ground
plane. The external feedback network should be very
close to the FB pin, within 0.2in (5mm). Keep noisy
traces, such as the LX node, as short as possible. For
the 8-pin TDFN package, connect GND to the exposed
paddle directly under the IC. Figure 4 illustrates an
example PC board layout and routing scheme.
8
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相关代理商/技术参数 |
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|---|---|
| MAX8561EVKIT | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX8561 MAX8562 - Rail/Tube |
| MAX8562ETA | 制造商:Maxim Integrated Products 功能描述:4MHZ 500MA SYNCHRONOUS STEP-DOWN DC-DC CONVERTERS IN THIN SO - Rail/Tube |
| MAX8562ETA+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8562ETA-T | 功能描述:直流/直流开关转换器 4MHz 500mA Step-Down DC/DC Converter 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 |
| MAX8563EEE | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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