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| 型号： | MAX865EUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHD CAP DBL INV 8UMAX |
| 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： | 2 |
| 输出电压： | ±3.5 V ~ ±12 V |
| 输入电压： | 1.5 V ~ 6 V |
| 频率 - 开关： | 24kHz |
| 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： | 管件 |
| 供应商设备封装： | 8-uMAX |
| 产品目录页面： | 1409 (CN2011-ZH PDF) |
Compact, Dual-Output Charge Pump
converter (RS+), where I LOAD+ is the combination of I V-
and the external load on V+ (I V+ ):
V DROOP+ = I LOAD+ x RS+ = ( I V+ + I V - ) x RS+
Determine V+ and V- as follows:
V+ = 2V IN - V DROOP+
V - = (V+ - V DROOP ) = -(2V IN - V DROOP+ - V DROOP- )
The output resistance for the positive and negative
charge pumps are tested and specified separately. The
positive charge pump is tested with V- unloaded. The
negative charge pump is tested with V+ supplied from
an external source, isolating the negative charge
pump.
Efficiency Considerations
Theoretically, a charge-pump voltage multiplier can
approach 100% power efficiency under the following
conditions:
? The charge-pump switches have virtually no offset
and extremely low on-resistance.
? The drive circuitry consumes minimal power.
? The impedances of the reservoir and pump capaci-
tors are negligible.
For the MAX865, the energy loss per clock cycle is the
sum of the energy loss in the positive and negative
converters, as follows:
LOSS CYCLE = LOSS POS + LOSS NEG
C1 ? ( V + ) ? 2 ( V + ) ( V IN ) ?
Current draw from either V+ or V- is supplied by the
reservoir capacitor alone during one half cycle of the
=
1
2
?? ??
2
C 2 ? ( V + )
? ( V ? )
clock. Calculate the resulting ripple voltage on either
output as follows:
+
1
2
??
2
2 ?
??
V RIPPLE =
1
2
I LOAD (1 / f PUMP ) (1 / C RESERVOIR )
The average power loss is simply:
where I LOAD is the load on either V+ or V-. For the typi-
cal f PUMP of 30kHz with 3.3μF reservoir capacitors, the
ripple is 25mV when I LOAD is 5mA. Remember that, in
most applications, the total load on V+ is the V+ load
current (I V+ ) and the current taken by the negative
charge pump (I V- ).
V IN
3.3 μ F
P LOSS = LOSS CYCLE x f PUMP
Resulting in an efficiency of:
η = Total Output Power / ( Total Output Power ? P LOSS
3.3 μ F
)
1
2
C1-
C2- MAX865
C1+
V+
8
7
1
2
C1-
C2+ MAX865
C1+
V+
8
7
3.3 μ F
OUT+
3.3 μ F
3
4
C2-
V-
IN
GND
6
5
3.3 μ F
3
4
C2-
V-
IN
GND
6
5
IN
GND
3.3 μ F
OUT-
Figure 3. Paralleling MAX865s
6
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX865EUA+ | 功能描述:电荷泵 Compact Dual-Out 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 |
| MAX865EUA+T | 功能描述:电荷泵 Compact Dual-Out 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 |
| MAX865EUA-T | 功能描述:电荷泵 Compact Dual-Out 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 |
| MAX8660AETL+ | 功能描述:PMIC 解决方案 Low-IQ PMIC w/Dynamic V Mgt RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8660AETL+T | 功能描述:PMIC 解决方案 Low-IQ PMIC w/Dynamic V Mgt RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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