- 您现在的位置：买卖IC网 > PDF目录1845 > MAX679EUA+T (Maxim Integrated Products)IC REG BOOST SWITCHED CAP 8UMAX PDF资料下载
参数资料
| 型号： | MAX679EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/6页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SWITCHED CAP 8UMAX |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），切换电容（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 1.8 V ~ 3.6 V |
| 频率 - 开关： | 330kHz ~ 1MHz |
| 电流 - 输出： | 20mA |
| 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-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
Regulated 3.3V Charge Pump
____________________________Typical Operating Characteristics (continued)
(Typical Operating Circuit with: V IN = V S HDN = 2V, C IN = 4.7μF, C1 = 0.33μF, C OUT = 10μF, tested in-circuit, T A = +25°C, unless
otherwise noted.)
LOAD-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
OUTPUT RIPPLE (2mA LOAD)
MAX679 TOC10
FSET = IN (1MHz)
V OUT
50mV/div
AC COUPLED
(1mA TO 10mA LOAD, V IN = 3V)
MAX679 TOC11
V OUT
10mV/div
AC COUPLED
(1mA TO 10mA LOAD, V IN = 2V)
MAX679 TOC12
V OUT
10mV/div
AC COUPLED
V IN = 3V
FSET = IN (1MHz)
I OUT
5mA/div
V IN = 2V
FSET = IN (1MHz)
I OUT
5mA/div
100 μ s/div
100 μ s/div
50 μ s/div
______________________________________________________________Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
FSET
SHDN
IN
GND
PGND
C1-
C1+
OUT
FUNCTION
Set Charge-Pump Frequency Input. FSET = GND selects 330kHz and FSET = IN selects 1MHz. Do not leave
FSET unconnected.
Shutdown Input. The device shuts down, the output disconnects from the input, and the supply current
decreases to 1μA when SHDN is a logic low. Connect SHDN to IN for normal operation.
Supply Input. Connect to an input supply in the 1.8V to 3.6V range. Bypass IN to GND with a (C OUT / 2)μF
capacitor.
Ground. Analog ground for internal reference and control circuitry.
Power Ground. Charge-pump current flows through this pin.
Negative Terminal of the Charge-Pump Capacitor
Positive Terminal of the Charge-Pump Capacitor
3.3V Power Output. Bypass OUT to GND with an output filter capacitor (see the Design Procedure section).
_______________Detailed Description
The MAX679 regulated charge pump has a 50% duty-
cycle clock. In phase one (charge phase), the charge-
transfer capacitor (C1) charges to the input voltage,
and output current is delivered by the output filter
capacitor (C OUT ). In phase two (transfer phase), C1 is
placed in series with the input and connects to the out-
put, transferring its charge to C OUT . If the clock were to
run continuously, this process would eventually gener-
ate an output voltage equal to two times the input volt-
age (hence the name “doubler”).
The charge pump regulates by gating the oscillator on
and off as needed to maintain output regulation. This
method has low quiescent current, but to achieve
acceptable output ripple, C1 must be significantly
lower in value than C OUT .
Start-Up Sequence
The MAX679 soft-start circuitry prevents excessive cur-
rent from being drawn from the battery at start-up or
when the output is shorted. This is done by limiting the
charge pump to 1/10 the normal current until either the
output is in regulation or the first 4096 charge-pump
4
_______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6802UR46D3/V+T | IC SUPERV MPU RESET SOT23-3 |
| MAX6805US44D3+T | IC RESET MPU LOW PWR SOT143-4 |
| MAX6807US26+T | IC VOLT DETECTOR 2.3V SOT143-4 |
| MAX680CSA | IC REG MULTI CONFIG ADJ DL 8SOIC |
| MAX680ESA+T | IC REG MULTI CONFIG ADJ DL 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6800UR26D1 | 制造商:Maxim Integrated Products 功能描述:3-PIN LOW-POWER MICROPROCESSOR RES - Rail/Tube |
| MAX6800UR26D1+T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6800UR26D1-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6800UR26D2 | 制造商:Maxim Integrated Products 功能描述:3-PIN LOW-POWER MICROPROCESSOR RES - Rail/Tube |
| MAX6800UR26D2+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.63V 5UA 3PIN SOT-23 - Rail/Tube |
发布紧急采购，3分钟左右您将得到回复。