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参数资料
| 型号： | MAX618EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/14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
Pin Description
PIN
1, 8, 9,
12, 16
2, 3, 4
5
6
7
10
11
13, 14, 15
NAME
GND
LX
SHDN
COMP
FB
IN
VL
PGND
FUNCTION
Ground
Drain of internal N-channel switch. Connect the inductor between IN and LX.
Shutdown Input. A logic low puts the MAX618 in shutdown mode and reduces supply current to 3μA.
SHDN must not exceed VL. In shutdown, the output falls to V IN less one diode drop.
Compensation Input. Bypass to GND with the capacitance value shown in Table 2.
Feedback Input. Connect a resistor-divider network to set V OUT . FB threshold is 1.5V.
LDO Regulator Supply Input. IN accepts inputs up to +28V. Bypass to GND with a 1μF ceramic capacitor
as close to pins 10 and 12 as possible.
Internal 3.1V LDO Regulator Output. Bypass to GND with a 4.7μF capacitor.
Power Ground, source of internal N-channel switch
_______________ Detailed Description
V IN
3V TO 28V
L
The MAX618 pulse-width modulation (PWM) DC-DC
converter with an internal 28V switch operates in a wide
C IND
range of DC-DC conversion applications including
boost, SEPIC, and flyback configurations. The MAX618
1 μ F
IN
SHDN
MAX618
LX
PGND
ECB1Q503L
C OUT
V OUT
UP TO 28V
R1
uses fixed-frequency PWM operation and Maxim’s pro-
prietary Idle Mode control to optimize efficiency over a
wide range of loads. It also features a shutdown mode
to minimize quiescent current when not in operation.
PWM Control Scheme and
Idle Mode Operation
4.7 μ F
V L
FB
The MAX618 combines continuous-conduction PWM
operation at medium to high loads and Idle Mode oper-
ation at light loads to provide high efficiency over a
C COMP
COMP
GND
C P
R2
wide range of load conditions. The MAX618 control
scheme actively monitors the output current and auto-
matically switches between PWM and Idle Mode to
optimize efficiency and load regulation. Figure 2 shows
a functional diagram of the MAX618’s control scheme.
The MAX618 normally operates in low-noise, continu-
V OUT
8V
12V
28V
R1
402k Ω
715k Ω
574k Ω
R2
93.1k Ω
100k Ω
32.4k Ω
C IND
150 μ F
100 μ F
86 μ F
L
12 μ H
15 μ H
39 μ H
C OUT
150 μ F
100 μ H
33 μ F
C P
220pF
56pF
47pF
C COMP
0.082 μ F
0.1 μ F
0.47 μ F
ous-conduction PWM mode, switching at 250kHz. In
PWM mode, the internal MOSFET switch turns on with
each clock pulse. It remains on until either the error
comparator trips or the inductor current reaches the 2A
switch-current limit. The error comparator compares the
Figure 1. Single-Supply Operation
feedback-error signal, current-sense signal, and slope-
compensation signal in one circuit block. When the
switch turns off, energy transfers from the inductor to
_______________________________________________________________________________________________________
5
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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 |
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| 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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