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参数资料
| 型号： | MAX686EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV +/-27.5V 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），反相 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | ±27.5V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 100mA |
| 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 |
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
D2
MBR0530L
V IN = 0.8V TO 27.5V
L1
22 μ H
R4
2 ?
15 μ F
2.2 μ F
D1
MBR0530L
V CC = 2.7V TO 5.5V
0.1 μ F
V CC
V DD
LX
DACOUT
R3
POL
LCDON
FB
C F
470pF
UP
MAX686
R1
R2
DAC CONTROL
ON/OFF
DN
SHDN
REF
POK
ISET
NEGATIVE
OUTPUT
VOLTAGE
| V OUT | ≤ (27.5V - V IN )
GND
PGND
0.1 μ F
2.2 μ F
Figure 3. Alternative Negative Output Voltage Application Circuit
Detailed Description
The MAX686 is a step-up converter that contains an
internal N-channel MOSFET switch to convert a +0.8V
to +27.5V battery voltage to a higher positive or a nega-
tive voltage. Figure 1 shows the MAX686 configured to
produce a positive output voltage. Figure 2 shows the
MAX686 configured with one additional diode and
capacitor to produce a negative output voltage. Figure
3 shows an alternative method for developing negative
output voltages. Set the output voltage with an external
resistor-divider network. Adjust the output voltage with
the internal digital-to-analog converter (DAC). The
MAX686’s current-limited pulse-frequency-modulation
(PFM) control scheme has programmable current limit-
ing and provides high efficiency over a wide range of
load conditions.
Boost Control Scheme (POL = GND)
A combination of peak current limiting and a pair of one-
shots controls the MAX686 switching. During the on-
cycle, the internal switch closes, and current through
the inductor ramps up until either the fixed 10μs maxi-
mum on-time expires (at low input voltages) or the
switch peak current limit is reached. The peak current
limit is selectable to either 500mA (ISET = V CC ) or
250mA (ISET = GND) (see the section Setting the Peak
Inductor Current Limit).
After the on-cycle terminates, the switch turns off, and
the inductor charges the output capacitor through the
diode. If the output is out of regulation after the mini-
mum off-time has transpired, another on-cycle begins.
If the output is within regulation when the minimum off-
time transpires, the off-cycle extends until the output
falls out of regulation, at which point an on-cycle starts.
The MAX686 regulates the voltage on FB (V FB ) to
1.25V. When the output is well below regulation (V FB is
less than 1V and the switch current limit is exceeded),
the MAX686 operates in initial power-up mode, and the
minimum off-time increases to 5μs to provide soft-start.
The switching frequency, which depends on the load,
the input voltage, and the output voltage, can be as
high as 300kHz.
Inverting Control Scheme (POL = V CC )
In inverting operation, the MAX686 regulates the volt-
age on FB (V FB ) to 0V, and the error amplifier’s polarity
is reversed. The minimum off-time changes to 3.5μs for
negative output voltages. When the output is well below
regulation (V FB is 0.25V or more and the switch current
limit is exceeded), initial power-up is assumed, and the
minimum off-time increases to 5μs to provide soft-start.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX686EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX686 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 |
| MAX6870ETJ | 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 |
| MAX6870ETJ+ | 功能描述:监控电路 EEPROM-Prog Hex Power-Sup Sequencer 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 |
| MAX6870ETJ+T | 功能描述:监控电路 EEPROM-Prog Hex Power-Sup Sequencer 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 |
| MAX6870ETJ-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 |
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