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| 型号： | MAX619ESA-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/7页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP 5V 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2 V ~ 3.6 V |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 50mA |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
Regulated 5V Charge-Pump
DC-DC Converter
_____________________Pin Description
the MAX619 switches between doubler and tripler
mode on alternating cycles, making a 2.5 x V IN charge
PIN NAME
1 C1+
FUNCTION
Positive Terminal for C1
pump. To further enhance efficiency over the input
range, an internal comparator selects the higher of V IN
or V OUT to run the MAX619 ’s internal circuitry.
2
IN
Input Supply Voltage
Efficiency with V IN = 2V and I OUT = 20mA is typically
80%.
3
4
5
6
7
8
OUT
C2+
C2-
GND
SHDN
C1-
+5V Output Voltage. V OUT = 0V when in
shutdown mode.
Positive Terminal for C2
Negative Terminal for C2
Ground
Active-High CMOS Logic-Level Shutdown Input
Negative Terminal for C1
Figure 1 shows a detailed block diagram of the
MAX619. In tripler mode, when the S1 switches close,
the S2 switches open and capacitors C1 and C2
charge up to V IN . On the second half of the cycle, C1
and C2 are connected in series between IN and OUT
when the S1 switches open and the S2 switches close,
as shown in Figure 1. In doubler mode, only C2 is
used.
During one oscillator cycle, energy is transferred from
the input to the charge-pump capacitors, and then
_______________Detailed Description
Operating Principle
The MAX619 provides a regulated 5V output from a 2V
to 3.6V (two battery cells) input. Internal charge pumps
and external capacitors generate the 5V output, elimi-
nating the need for inductors. The output voltage is
regulated to 5V ±4% by a pulse-skipping controller that
turns on the charge pump when the output voltage
begins to droop.
To maintain the greatest efficiency over the entire input
voltage range, the MAX619 ’s internal charge pump
operates as a voltage doubler when V IN ranges from
3.0V to 3.6V, and as a voltage tripler when V IN ranges
from 2.0V to 2.5V. When V IN ranges from 2.5V to 3.0V,
from the charge-pump capacitors to the output capaci-
tor and load. The number of cycles within a given time
frame increases as the load increases or as the input
supply voltage decreases. In the limiting case, the
charge pumps operate continuously, and the oscillator
frequency is nominally 500kHz.
Shutdown Mode
The MAX619 enters low-power shutdown mode when
SHDN is a logic high. SHDN is a CMOS-compatible
input. In shutdown mode, the charge-pump switching
action is halted, OUT is disconnected from IN, and
V OUT falls to 0V. Connect SHDN to ground for normal
operation. When V IN = 3.6V, V OUT typically reaches
5V in 0.5ms under no-load conditions after SHDN goes
low.
4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX619EVKIT | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Evaluation Kit for the MAX619 |
| MAX619EVKIT-SO | 功能描述:电荷泵 Evaluation Kit for the MAX619 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX619MJA | 功能描述:电荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX620 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Quad, High-Side MOSFET Drivers |
| MAX620C/D | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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