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| 型号： | MAX618EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.5A 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 28V |
| 输入电压： | 3 V ~ 28 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 250kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
28V, PWM, Step-Up DC-DC Converter
VL
MAX618
SYSTEM
IN
MAX618
OPEN-DRAIN
LOGIC
100k
LOGIC SUPPLY
VL
SHDN
ON/OFF
CONTROL
SYSTEM LOGIC
ON/OFF
SHDN
CONTROL
L =
V ? V ? ? ( V OUT ? V I N ) ?
I LX(PEAK) = I OUT OUT + 2 μ s ? IN ? ? ?
R 1 = R 2 ? OUT ? 1 ?
Figure 5. Adding On/Off Control to Circuit of Figure 1 or 4
Shutdown Mode
In shutdown mode ( SHDN = 0), the MAX618’s feed-
back and control circuit, reference, and internal biasing
circuitry turn off and reduce the IN supply current to
3μA (10μA max). When in shutdown, a current path
remains from the input to the output through the exter-
nal inductor and diode. Consequently, the output falls
to V IN less one diode drop in shutdown.
SHDN may not exceed VL. For always-on operation,
connect SHDN to VL. To add on/off control to the circuit
of Figure 1 or 4, pull SHDN to VL with a resistor (10k Ω
to 100k Ω ) and drive SHDN with an open-drain logic
gate or switch as shown in Figure 5. Alternatively, the
circuit of Figure 3 allows direct SHDN drive by any
logic-level gate powered from the same supply that
powers VL and IN, as shown in Figure 6.
__________________Design Procedure
The MAX618 operates in a number of DC-DC converter
configurations including step-up, SEPIC, and flyback.
The following design discussion is limited to step-up
converters.
Setting the Output Voltage
Two external resistors (R1 and R2) set the output volt-
age. First, select a value for R2 between 10k Ω and
200k Ω . Calculate R1 with:
? V ?
? V FB ?
where V FB is 1.5V.
Figure 6. Adding On/Off Control to Circuit of Figure 3
Determining the Inductor Value
The MAX618’s high switching frequency allows the use
of a small value inductor. The recommended inductor
value is proportional to the output voltage and is given
by the following:
V OUT
7 ? 10 5
After solving for the above equation, round down as
necessary to select a standard inductor value.
When selecting an inductor, choose one rated to
250kHz, with a saturation current exceeding the peak
inductor current, and with a DC resistance under
200m Ω . Ferrite core or equivalent inductors are gener-
ally appropriate (see MAX618 EV kit data sheet).
Calculate the peak inductor current with the following
equation:
V IN ? L ? ? V OUT ?
Note that the peak inductor current is internally limited
to 2A.
Diode Selection
The MAX618’s high switching frequency demands a
high-speed rectifier. Schottky diodes are preferred for
most applications because of their fast recovery time
and low forward voltage. Make sure that the diode’s
peak current rating exceeds the 2A peak switch cur-
rent, and that its breakdown voltage exceeds the out-
put voltage.
_______________________________________________________________________________________
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相关代理商/技术参数 |
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|---|---|
| MAX618EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX618 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 |
| MAX619 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Regulated 5V Charge-Pump DC-DC Converter |
| MAX6190 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Precision, Micropower, Low-Dropout Voltage References |
| MAX6190A | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Precision, Micropower, Low-Dropout Voltage References |
| MAX6190AESA | 功能描述:基准电压& 基准电流 Precision uPower Voltage Ref RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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