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参数资料
| 型号： | MAX16903RATB50/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V 1A 10TDFN |
| 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： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 3.5 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.1MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
MAX16903
2.1MHz, High-Voltage, 1A Mini-Buck Converter
where:
Δ I P ? P =
(V IN ? V OUT ) × V OUT
V IN × f SW × L
Δ I P-P is the peak-to-peak inductor current as calculated
above and f SW is the converter’s switching frequency.
The allowable deviation of the output voltage during
fast transient loads also determines the output capaci-
D = OUT
ESR OUT =
C OUT = STEP RESPONSE
Δ V ESR
Δ I P ? P
Δ I P ? P
8 × Δ V Q × f SW
and
V
V IN
where I OUT is the output current, D is the duty cycle,
and f SW is the switching frequency. Use additional
input capacitance at lower input voltages to avoid pos-
sible undershoot below the UVLO threshold during tran-
sient loading.
Output Capacitor
To maintain acceptable phase margin, a minimum
ceramic output capacitor value of 10μF is needed with
a voltage rating 2 times the V OUT voltage. Additional
output capacitance may be needed based on applica-
tion-specific output-voltage ripple requirements.
The allowable output-voltage ripple and the maximum
deviation of the output voltage during step load cur-
rents determine the output capacitance and its ESR.
The output ripple comprises of Δ V Q (caused by the
capacitor discharge) and Δ V ESR (caused by the ESR of
the output capacitor). Use low-ESR ceramic or alu-
minum electrolytic capacitors at the output. For alu-
minum electrolytic capacitors, the entire output ripple is
contributed by Δ V ESR . Use the ESR OUT equation to cal-
culate the ESR requirement and choose the capacitor
accordingly. If using ceramic capacitors, assume the
contribution to the output ripple voltage from the ESR
and the capacitor discharge to be equal. The following
equations show the output capacitance and ESR
requirement for a specified output-voltage ripple.
ESR =
C OUT =
where:
tance and its ESR. The output capacitor supplies the
step load current until the converter responds with a
greater duty cycle. The response time (t RESPONSE )
depends on the closed-loop bandwidth of the convert-
er. The high switching frequency of the MAX16903
allows for a higher closed-loop bandwidth, thus reduc-
ing t RESPONSE and the output capacitance require-
ment. The resistive drop across the output capacitor’s
ESR and the capacitor discharge causes a voltage
droop during a step load. Use a combination of low-
ESR tantalum and ceramic capacitors for better tran-
sient load and ripple/noise performance. Keep the
maximum output-voltage deviations below the tolerable
limits of the electronics being powered. When using a
ceramic capacitor, assume an 80% and 20% contribu-
tion from the output capacitance discharge and the
ESR drop, respectively. Use the following equations to
calculate the required ESR and capacitance value:
Δ V ESR
I STEP
I × t
Δ V Q
where I STEP is the load step and t RESPONSE is the
response time of the converter. The converter response
time depends on the control-loop bandwidth.
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching
power losses and clean stable operation. Use a multilayer
board wherever possible for better noise immunity. Refer
to MAX16903 Evaluation Kit for recommended PCB lay-
out. Follow these guidelines for a good PCB layout:
1) The input capacitor (4.7 μF, see the applications
schematic in the Typical Operating Circuits) should be
placed right next to the SUP pins (pins 2 and 3 on the
TSSOP-EP package) of the MAX16903. Since the
MAX16903 operates at 2.1MHz switching frequency,
this placement is critical for effective decoupling of
Δ I P ? P =
(V IN ? V OUT ) × V OUT
V IN × f SW × L
high-frequency noise from the SUP pins.
2) Solder the exposed pad to a large copper plane
area under the device. To effectively use this copper
10
V OUT _ RIPPLE ? Δ V ESR + Δ V Q
area as heat exchanger between the PCB and ambi-
ent expose the copper area on the top and bottom
side. Add a few small vias or 1 large via on the cop-
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16903RAUE33/V+ | 功能描述:直流/直流开关转换器 2.1MHz Mini-Buck 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 |
| MAX16903RAUE33/V+T | 功能描述:直流/直流开关转换器 2.1MHz Mini-Buck 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 |
| MAX16903RAUE33+ | 制造商:Maxim Integrated Products 功能描述:2.1MHZ, HIGH-VOLTAGE, 1A MINI-BUCK CONVERTER - Rail/Tube |
| MAX16903RAUE50/V+ | 功能描述:直流/直流开关转换器 2.1MHz Mini-Buck 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 |
| MAX16903RAUE50/V+T | 功能描述:直流/直流开关转换器 2.1MHz Mini-Buck 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 |
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