- 您现在的位置：买卖IC网 > PDF目录1836 > MAX15031ATE+ (Maxim Integrated Products)IC BOOST CONV/CURRENT MON 16TQFN PDF资料下载
参数资料
| 型号： | MAX15031ATE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC BOOST CONV/CURRENT MON 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 应用： | 转换器电流监控器，APD 偏压应用 |
| 输入电压： | 2.7 V ~ 11 V |
| 输出数： | 1 |
| 输出电压： | 3.7 V ~ 76 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 托盘 |
80V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
output current in amperes, L is the inductor value in
microhenrys, and η is the efficiency of the boost con-
FB
R 2
V OUT
verter (see the Typical Operating Characteristics).
Determining the Inductor Value
Three key inductor parameters must be specified for
operation with the MAX15031: inductance value (L),
inductor saturation current (I SAT ), and DC resistance
(DCR). In general, the inductor should have a saturation
current rating greater than the maximum switch peak
MAX15031
R 1
current-limit value (I LIM_LX = 1.6A). Choose an inductor
with a low-DCR resistance for reasonable efficiency.
Use the following formula to calculate the lower bound
of the inductor value at different output voltages and
output currents. This is the minimum inductance value
for discontinuous mode operation for supplying full
300mW of output power.
η × I LIM_LX
Figure 1. Adjustable Output Voltage
Design Procedure
L MIN [ μ H] =
2 × T S × I OUT × (V OUT ? V IN_MIN )
2
R 2 1 ? ? OUT ? ? 1 ?
? ? V ? ?
L OPTIMUM [ μ H] = MAX
Setting the Output Voltage
Set the MAX15031 output voltage by connecting a resis-
tive divider from the output to FB to SGND (Figure 1).
Select R 1 (FB to SGND resistor) between 200k Ω and
400k Ω . Calculate R 2 (V OUT to FB resistor) using the fol-
lowing equation:
= R
? ?
? ? V REF ? ?
where V OUT can range from (V IN + 1V) to 76V and V REF
= 1.245V or V CNTRL depending on the V CNTRL value.
For V CNTRL > 1.5V, the internal 1.245V (typ) reference
where V IN_MIN , V OUT (both in volts), and I OUT (in
amperes) are typical values (so that efficiency is opti-
mum for typical conditions), T S (in microseconds) is the
period, η is the efficiency, and I LIM_LX is the peak
switch current in amperes (see the Electrical
Characteristics table).
Calculate the optimum value of L (L OPTIMUM ) to ensure
the full output power without reaching the boundary
between continuous conduction mode (CCM) and DCM
using the following formula:
L [ μ H]
2 . 25
V IN_MIN (V OUT IN_MIN S × η
? V ) × T
2 × I OUT × V OUT
voltage is used as the feedback set point (V REF =
1.245V) and for V CNTRL < 1.25V, V REF = V CNTRL .
Determining Peak Inductor Current
If the boost converter remains in the discontinuous
where L MAX [ μ H] =
2
2
I LPEAK =
mode of operation, then the approximate peak inductor
current, I LPEAK (in amperes), is represented by the for-
mula below:
2 × T S × (V OUT ? V IN_MIN ) × I OUT_MAX
η × L
where T S is the switching period in microseconds,
V OUT is the output voltage in volts, V IN_MIN is the mini-
mum input voltage in volts, I OUT_MAX is the maximum
For a design in which V IN = 3.3V, V OUT = 70V, I OUT =
3mA, η = 45%, I LIM_LX = 1.3A, and T S = 2.5μs: L MIN =
1.3μH and L MAX = 23μH.
For a worse-case scenario in which V IN = 2.9V, V OUT =
70V, I OUT = 4mA, η = 43%, I LIM_LX = 1.3A, and T S =
2.5μs: L MIN = 1.8μH and L MAX = 15μH.
The choice of 4.7μH is reasonable given the worst-case
scenario above. In general, the higher the inductance,
the lower the switching noise. Load regulation is also
better with higher inductance.
12
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX15032ATA+T | IC REG BOOST ADJ 1A 8TDFN-EP |
| MAX15034AAUI+ | IC REG CTRLR BUCK PWM CM 28TSSOP |
| MAX15035ETL+T | IC REG BOOST SYNC 15A 40TQFN |
| MAX15037ATE+ | IC REG BUCK BST SYNC ADJ 16TQFN |
| MAX15038ETG+T | IC REG BUCK SYNC ADJ 4A 24TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15031ATE+ | 功能描述:直流/直流开关转换器 80V 300mW Boost Conv/Current Mtr 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 |
| MAX15031ATE+T | 功能描述:直流/直流开关转换器 80V 300mW Boost Conv/Current Mtr 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 |
| MAX15031AWE+ | 制造商:Maxim Integrated Products 功能描述:BOOST CNVRTR AND CURRENT MONITOR 16TQFN EP - Rail/Tube |
| MAX15031EVKIT | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX15031 - Bulk |
| MAX15031EVKIT+ | 功能描述:电源管理IC开发工具 MAX15031 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
发布紧急采购，3分钟左右您将得到回复。