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参数资料
| 型号： | MAX8625AETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.8A 14TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，1.25 V ~ 4 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 800mA |
| 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： | 14-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 其它名称： | MAX8625AETD+TDKR |
High-Efficiency, Seamless Transition,
Step-Up/Down DC-DC Converter
R 1 = 100 k ? × ? OUT ? 1 ?
Applications Information
Selecting the Output Voltage
The MAX8625A output is nominally fixed at 3.3V.
Connect FB to GND to select the internally fixed-output
voltage. For an adjustable output voltage, connect FB
to the center tap of an external resistor-divider connect-
ed from the output to GND (R1 and R2 in Figure 3).
Select 100k ? for R2 and calculate R1 using the follow-
ing equation:
? V ?
? V FB ?
where V FB = 1.25V and V OUT is the desired output reg-
ulation voltage. V OUT must be between 1.25V and 4V.
Note that the minimum output voltage is limited by the
minimum duty cycle. V OUT cannot be below 1.25V.
Calculating Maximum Output Current
The maximum output current provided by the MAX8625A
circuit depends on the inductor value, switching frequen-
cy, efficiency, and input/output voltage.
See the Typical Operating Characteristics section for
the Maximum Load Current vs. Input Voltage graph.
Capacitor Selection
The input and output ripple currents are both discontin-
uous in this topology. Therefore, select at least two
L
3.3 μ H
22μF ceramic capacitors at the input. Select two 22μF
ceramic output capacitors. For best stability over a
wide temperature range, use X5R or better dielectric.
Inductor Selection
The recommended inductance range for the
MAX8625A is 3.3μH to 4.7μH. Larger values of L give a
smaller ripple, while smaller L values provide a better
transient response. This is because, for boost and step-
up/down topologies, the crossover frequency is
inversely proportional to the value of L for a given load
and input voltage. The MAX8625A is internally compen-
sated, and therefore, the choice of power components
for stable operation is bounded. A 3.3μH inductor with
2A rating is recommended for the 3.3V fixed output with
0.8A load.
PCB Layout and Routing
Good PCB layout is important to achieve optimal per-
formance from the MAX8625A. Poor design can cause
excessive conducted and/or radiated noise.
Conductors carrying discontinuous currents and any
high-current path should be made as short and wide as
possible. Keep the feedback network (R1 and R2) very
close to the IC, preferably within 0.2 inches of the FB
and GND pins. Nodes with high dv/dt (switching
nodes) should be kept as small as possible and routed
away from FB. Connect the input and output capacitors
as close as possible to the IC. Refer to the MAX8625A
evaluation kit for a PCB layout example.
1
2
3
4
INPUT
2.7V TO 5.5V
C1, C2
22 μ F
13
14
IN
IN
LX1
LX1
LX2
LX2
OUT
OUT
9
10
OUTPUT
3V
C3, C4
22 μ F
U1
R1
140k ?
MODE
6
MAX8625A
FB
7
SELECTION
SKIP
INPUT
OFF
C5
0.1 μ F
ON
5
8
ON
REF
11
GND
GND 12
R2
100k ?
Figure 3. Typical Application Circuit (Adjustable Output)
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8625AEVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVAL BD FOR MAX8625A - Boxed Product (Development Kits) |
| MAX8625EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY SEAMLESS TRANSITIO - Boxed Product (Development Kits) |
| MAX8627ETD+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 14TDFN EP - Rail/Tube |
| MAX8627ETD+T | 功能描述:直流/直流开关转换器 20uA 1MHz Synch Boost 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 |
| MAX8627EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW VBATT 20+A IQ 1MHZ SYNCHRONO - Rail/Tube |
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