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参数资料
| 型号： | MAX868EUB+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 切换式电容器（充电泵），倍增器，反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -3.6 V ~ -11 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| 频率 - 开关： | 270kHz ~ 630kHz |
| 电流 - 输出： | 30mA |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-µMAX |
| 产品目录页面： | 1409 (CN2011-ZH PDF) |
Regulated, Adjustable -2x
Inverting Charge Pump
C C *
Surface-mount ceramic capacitors are preferred, due
to their small size, low cost, and low equivalent series
resistance (ESR). To ensure proper operation over the
V REF
OPTIONAL
CONNECTION
R2
FB
MAX868
R1
V OUT
entire temperature range, choose ceramic capacitors
with X7R (or equivalent) low temperature-coefficient
(tempco) dielectrics. See Table 1 for a list of suggested
capacitor suppliers.
Choosing the Output Capacitor
The output capacitor stores the charge transferred from
V IN
IN
OUT
*OPTIONAL
FEED-FORWARD
CAPACITOR
the flying capacitors and services the load between
oscillator cycles. A good general rule is to make the
output capacitance at least ten times greater than that
of the flying capacitors.
The output voltage ripple is dependent upon the
Figure 4. Setting the Output Voltage Using Two External
Resistors
Capacitor Selection
Choosing the Flying Capacitors
capacitance of the flying capacitor and upon the output
capacitor’s capacitance and ESR. When operating in
closed-loop mode (when the MAX868 is generating a
regulated output voltage), use the following equation to
approximate peak-to-peak output voltage ripple:
?? 1 + 4 x C OUT
R ESR ?
R OUT ?
?
Proper choice of the flying capacitors is dependent pri-
marily upon the desired output current. For flying capaci-
tors in the 0.1μF to 0.33μF range, the maximum output
current can be approximated by the following equation:
V RIPPLE = ( 2 x V IN ?
| V OUT |
)
?
? 1
x ?
? C1 + C2
+
?
?
?
(
)
f MAX x C1 + C2
| V OUT |
V IN +
I OUT(MAX) =
2 x V IN ? | V OUT |
+ R OUT x
4 10V
where C1 and C2 are the flying capacitors, R ESR is the
output capacitor ’s ESR, and R OUT is the MAX868 ’s
open-loop output impedance, typically 70 ? .
Choose a low-ESR output capacitor for minimum output
where f MAX is the maximum oscillator frequency (typically
450kHz), R OUT is the MAX868 open-loop output
impedance (typically 70 ? ), and C1 and C2 are the flying-
capacitor values. As a general rule, choose the lowest-
value flying capacitors that provide the desired output
current in order to minimize output voltage ripple (see the
section Choosing the Output Capacitor).
ripple. Surface-mount ceramic capacitors are preferred
for their small size, low cost, and low ESR; low-ESR tan-
talum electrolytic capacitors are also acceptable. When
using a ceramic output capacitor, ensure proper opera-
tion over the entire temperature range by choosing a
capacitor with X7R (or equivalent) low tempco dielec-
tric. See Table 1 for a list of suggested capacitor sup-
pliers.
Table 1. Manufacturers of Surface-Mount, Low-ESR Capacitors
TYPE
Surface-Mount Tantalum
Surface-Mount Ceramic
MANUFACTURER
AVX
Matsuo
Sprague
AVX
Matsuo
PART
TPS series
267 series
593D, 595D series
X7R type
X7R type
PHONE
(803) 946-0690
(714) 969-2491
(603) 224-1961
(803) 946-0690
(714) 969-2491
FAX
(803) 626-3123
(714) 960-6492
(603) 224-1430
(803) 626-3123
(714) 960-6492
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX868EUB+ | 功能描述:电荷泵 Reg/Adj -2x Invertin Charge Pump 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 |
| MAX868EUB+T | 功能描述:电荷泵 Reg/Adj -2x Invertin Charge Pump 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 |
| MAX868EUB-T | 功能描述:电荷泵 Reg/Adj -2x Invertin Charge Pump 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 |
| MAX868MUB/PR | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX86900EFD+ | 制造商:Maxim Integrated Products 功能描述:FIRST GEN BIO SENSOR WITH RED AND IR LED INTEGRATED IN OESIP - Rail/Tube 制造商:Maxim Integrated Products 功能描述:SENSOR RED/IR LED OESIP |
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