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参数资料
| 型号： | MAX8969EWL33+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 3.3V 1A 9WLP |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 1A |
| 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： | 9-WFBGA，WLBGA |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 9-WLP（1.3x1.3） |
MAX8969
Step-Up Converter
for Handheld Applications
Thermal Considerations
In most applications, the IC does not dissipate much
heat due to its high efficiency. But in applications where
the IC runs at high ambient temperature with heavy
loads, the heat dissipated may cause the temperature to
exceed the maximum junction temperature of the part. If
the junction temperature reaches approximately +165 N C,
the thermal overload protection is activated.
The maximum power dissipation depends on the
thermal resistance of the IC package and circuit board.
The power dissipated (P D ) in the device is:
P D = P OUT x (1/ E - 1)
where E is the efficiency of the converter and P OUT is
the output power of the step-up converter. The maximum
allowed power dissipation is:
P MAX = (T JMAX - T A )/ B JA
where (T JMAX - T A ) is the temperature difference between
the IC’s maximum rated junction temperature and the
surrounding air, and B JA is the thermal resistance of
the junction through the PCB, copper traces, and other
materials to the surrounding air.
Applications Information
Step-Up Inductor Selection
Due to the small size of the recommended capacitor, the
inductor’s value is limited to approximately 1 F H. Inductors
of approximately 1 F H guarantee stable operation of the
converter with capacitance as small as 8 F F (actual) pres-
ent on the converter’s output. If the inductor’s value is
reduced significantly below 1 F H, ripple can become
excessive.
Output Capacitor Selection
An output capacitor (C OUT ) is required to keep the
output-voltage ripple small and to ensure regulation loop
stability. The output capacitor must have low imped-
ance at the switching frequency. Ceramic capacitors
are highly recommended due to their small size and low
ESR. Ceramic capacitors with X5R or X7R temperature
characteristics generally perform well. One 22 F F (with
a minimum actual capacitance of 6 F F under operating
conditions) is recommended. This capacitor along with
an additional 10 F F of bypass capacitance, associated
with the load, guarantee proper performance of the IC.
The minimum combined capacitance is required to be
8 F F or larger. These capacitors can be found with case
size 0603 or larger.
Maxim Integrated
Input Capacitor Selection
The input capacitor (C IN ) reduces the current peaks
drawn from the battery or input power source. The
impedance of C IN at the switching frequency should
be kept very low. Ceramic capacitors with X5R or X7R
temperature characteristics are highly recommended
due to their small size, low ESR, and small temperature
coefficients. Note that some ceramic dielectrics exhibit
large capacitance and ESR variation with temperature
and DC bias. Ceramic capacitors with Z5U or Y5V
temperature characteristics should be avoided. A 4.7 F F
input capacitor is recommended for most applications.
This assumes that the input power source has at least
22 F F of additional capacitance near the IC. For optimum
noise immunity and low input-voltage ripple, the input
capacitor value can be increased.
Recommended PCB Layout and Routing
Poor layout can affect the IC performance, causing
electromagnetic interference (EMI) and electromagnetic
compatibility (EMC) performance, ground bounce, and
voltage losses. Poor layout can also affect regulation
and stability.
A good layout is implemented using the following rules:
? Place the inductor, input capacitor, and output
capacitor close to the IC using short traces. These
components carry high switching frequencies and
large traces act like antennas. The output capacitor
placement is the most important in the PCB layout
and should be placed directly next to the IC. The
inductor and input capacitor placement are second-
ary to the output capacitor’s placement but should
remain close to the IC.
? Route the output voltage path away from the induc-
tor and LX_ switching node to minimize noise and
magnetic interference.
? Maximize the size of the ground metal on the com-
ponent side to help with thermal dissipation. Use a
ground plane with several vias connecting to the
component-side ground to further reduce noise
interference on sensitive circuit nodes.
Refer to the MAX8969 Evaluation Kit for more details.
Chip Information
PROCESS: BiCMOS
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8969EWL35+T | 功能描述:直流/直流开关转换器 600mA 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 |
| MAX8969EWL37+T | 功能描述:直流/直流开关转换器 1A Boost Converter with Track mode 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 |
| MAX8969EWL42+T | 功能描述:直流/直流开关转换器 1A Boost Converter with Track mode 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 |
| MAX8969EWL50+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX8969EWL50+T | 制造商:Maxim Integrated Products 功能描述:1A BOOST CONVERTER FOR LOW INPUT BATTERY TECHNOLOGIES - Tape and Reel |
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