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| 型号： | MAX686EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16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
V IN = 0.8V
22 μ H
MBR0530L
V OUT
V IN = 0.8V
22 μ H
MBR0530L
V OUT
TO 27.5V
15 μ F
TO 27.5V
15 μ F
R2
C F
R2
C F
LX
V CC = 2.7V
TO 5.5V
0.1 μ F
V CC
LX
MAX686
DACOUT
R3
V CC = 2.7V
TO 5.5V
0.1 μ F
V CC
MAX686
REF
R POT
R3
100k
POTENTIOMETER
FB
Figure 4. Feed-Forward Capacitor
Table 1. Component Suppliers
R1
FB
R1
Figure 5. Using a Potentiometer to Adjust Output Voltage
Selecting Capacitors
SUPPLIER
CAPACITORS
AVX: TPS series
Matsuo: 267 series
Sprague 595D series
DIODES
Motorola: MBR0530L
Nihon; EC11 FS1 series
INDUCTORS
Coilcraft: DO1608 and
DT1608 series
Murata-Erie: LQH4
series
Sumida: CD43, CD54,
and CD74 series
TDK: NLC565050 series
PHONE
(803) 946-0690
(714) 969-2491
(603) 224-1961
(602) 303-5454
(805) 867-2555
(847) 639-6400
(814) 237-1431
(847) 956-0666
(847) 390-4373
FAX
(803) 626-3123
(714) 960-6492
(603) 224-1430
(602) 994-6430
(805) 867-2698
(847) 639-1469
(814) 238-0490
(847) 956-0702
(847) 390-4428
Output Filter Capacitors
The primary selection criterion for the output filter
capacitor is low equivalent series resistance (ESR). The
product of the peak inductor current and the output fil-
ter capacitor’s ESR determines the amplitude of the
high-frequency ripple seen on the output voltage.
These requirements can be balanced by appropriately
selecting the current limit, as discussed in the Setting
the Peak Inductor Current Limit section. Table 1 lists
some low-ESR capacitor suppliers.
Bypass Capacitors
Although the output current of many MAX686 applica-
tions may be relatively small, the input supply must be
able to source current transients equal to the ISET cur-
rent limit. The input bypass capacitor reduces the peak
currents drawn from the voltage source and reduces
noise caused by the MAX686’s switching action. The
input source impedance determines the size of the
capacitor required at the input (V IN ). As with the output
filter capacitor, low ESR is the primary consideration. A
Selecting Diodes
The MAX686’s high switching frequency demands a
high-speed rectifier. Schottky diodes, such as the
1N5818 or MBR0530L, are recommended. Make sure
that the diode’s peak current rating exceeds the peak
current set by ISET and that its breakdown voltage
exceeds the output voltage. Schottky diodes are pre-
ferred due to their low forward voltage. However, ultra-
high-speed silicon rectifiers are also acceptable. Table 1
lists Schottky diode suppliers.
15μF, low-ESR capacitor is adequate for most applica-
tions, although smaller bypass capacitors may also be
acceptable in light-load applications. Bypass the IC
separately with a 0.1μF ceramic capacitor placed as
close as possible to the V CC and GND pins.
Bypass REF to GND with a 0.1μF ceramic capacitor for
REF currents up to 25μA. REF can source up to 50μA of
current for external loads. For 25μA ≤ I REF ≤ 50μA,
bypass REF with a 0.47μF capacitor.
12
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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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