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| 型号： | MAX1822ESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP ADJ 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 切换式电容器（充电泵） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 14.5 V ~ 27.5 V |
| 输入电压： | 3.5 V ~ 16.5 V |
| 频率 - 开关： | 90kHz |
| 电流 - 输出： | 25mA |
| 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： | 管件 |
| 供应商设备封装： | 8-SOIC |
High-Side Power Supply
V OUT
S8
11V
8.5V
C3
V INT
S7
C2
RC OSCILLATOR
+
CONTROL LOGIC
POWER-READY
COMPARATOR
S4
S6
OVERVOLTAGE
COMPARATOR
S3
V CC
C1
S2
PR DRIVER
PR
S1
S5
GND
TWO-STAGE CHARGE PUMP
(SWITCHES SHOWN IN REFRESH MODE)
Figure 1. MAX1822 Block Diagram
Detailed Description
Charge-Pump Operation
The MAX1822 is a multistage charge-pump power sup-
ply. Although the charge pump is capable of multiply-
ing V CC up to four times, the output is regulated to V CC
+ 11V by an internal feedback circuit for inputs above
4V. The charge pump typically operates at 90kHz, but
regulates by pulse skipping. When V OUT exceeds V CC
+ 11V, the oscillator shuts off. As V OUT dips below V CC
+ 11V, the oscillator turns on.
Power-Ready Output
The Power-Ready Output (PR) signals control circuitry
when the high-side voltage reaches a preset level. This
feature can be used to protect external FET switches
from excess dissipation and damage by preventing them
from turning on, except when adequate gate drive levels
are present. When power is applied, PR remains low until
V OUT reaches approximately V CC + 8.5V. PR also goes
low if V OUT falls below this level during operation, i.e., if
the output is overloaded. The PR high level is V CC .
Applications Information
Quiescent Supply Current
MAX1822 quiescent supply current varies with V CC and
with the values of C1, C2, and C3 ( Typical Operating
Characteristics ). Even with no external load, the device
must still pump to overcome internal losses. Large ratios
between C3 and C1 or C2 require more charge-pump
cycles to restore V OUT . As V CC falls below 5V, quiescent
current rises fairly rapidly to about 1mA at 4V ( Typical
Operating Characteristics ). This rise occurs because
V OUT no longer pulse skips to regulate at low input volt-
ages; the oscillator runs continuously, so supply current
is higher. Figure 2 shows the test circuit for the
MAX1822 quiescent supply current.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1822ESA+ | 功能描述:直流/直流开关调节器 High-Side Power Supply RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1822ESA+T | 功能描述:直流/直流开关调节器 High-Side Power Supply RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1822ESA-T | 功能描述:直流/直流开关调节器 High-Side Power Supply RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1823AEUB | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1823AEUB+ | 功能描述:电源开关 IC - USB Dual USB Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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