参数资料
| 型号： | MAX829EUKG |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/17页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHD CAP DBL INV 5TSOP |
| 产品变化通告： | Product Obsolescence 01/Jul/2009 |
| 标准包装： | 1 |
| 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： | -1.15 V ~ -5.5 V，2.3 V ~ 11 V |
| 输入电压： | 1.15 V ~ 5.5 V |
| 频率 - 开关： | 19kHz ~ 54kHz |
| 电流 - 输出： | 50mA |
| 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： | 6-TSOP（0.059"，1.50mm 宽）5 引线 |
| 供应商设备封装： | 5-TSOP |
MAX828, MAX829
?V out
Charge Pump Efficiency
The overall power efficiency of the charge pump is
+ 2
1
6
C
R L
affected by four factors:
1. Losses from power consumed by the internal
OSC
oscillator, switch drive, etc. (which vary with input
V in
+
C 3
2
+
C 1
voltage, temperature and oscillator frequency).
2. I 2 R losses due to the on?resistance of the MOSFET
switches on?board the charge pump.
3
4
3. Charge pump capacitor losses due to Equivalent
Series Resistance (ESR).
4. Losses that occur during charge transfer from the
MAX828: C 1 = C 2 = C 3 = 10 m F
MAX829: C 1 = C 2 = C 3 = 3.3 m F
Figure 20. Test Setup/Voltage Inverter
commutation capacitor to the output capacitor when
a voltage difference between the two capacitors
exists.
Most of the conversion losses are due to factors 2, 3 and 4.
These losses are given by Equation 1.
LOSS(2,3,4)
DETAILED OPERATING DESCRIPTION
P
+ I out 2
R out ^ I out 2
The MAX828/829 charge pump converters inverts the
voltage applied to the V in pin. Conversion consists of a
(f
1
OSC
)C1
) 8R
SWITCH
) 4ESR
C1
) ESR
C2
two?phase operation (Figure 21). During the first phase,
switches S 2 and S 4 are open and S 1 and S 3 are closed. During
this time, C 1 charges to the voltage on V in and load current
is supplied from C 2 . During the second phase, S 2 and S 4 are
closed, and S 1 and S 3 are open. This action connects C 1
across C 2 , restoring charge to C 2 .
(eq. 1)
The 1/(f OSC )(C 1 ) term in Equation 1 is the effective output
resistance of an ideal switched capacitor circuit (Figures 22
and 23).
The losses due to charge transfer above are also shown in
Equation 2. The output voltage ripple is given by Equation 3.
V in
S1
C 1
S2
PLOSS + [ 0.5C 1 (Vin 2 * Vout 2 )
) 0.5C2 (VRIPPLE 2 * 2VoutVRIPPLE)]
fOSC
(eq. 2)
C 2
V
RIPPLE
+
(f
Iout
OSC )(C 2)
) 2(I out)(ESR
C2
)
(eq. 3)
S3
S4
?V out
f
From Osc
V in
V out
Figure 21. Ideal Switched Capacitor Charge Pump
C 1
C 2
R L
APPLICATIONS INFORMATION
Output Voltage Considerations
The MAX828/829 performs voltage conversion but does
Figure 22. Ideal Switched Capacitor Model
R EQUIV
not provide regulation. The output voltage will drop in a
V in
V out
linear manner with respect to load current. The value of this
equivalent output resistance is approximately 26 W nominal
at 25 ° C and V in = 5.0 V. V out is approximately ?5.0 V at light
R
EQUIV
+
f
1
C1
C 2
R L
loads, and drops according to the equation below:
VDROP + Iout Rout
Vout + * (Vin * VDROP)
http://onsemi.com
6
Figure 23. Equivalent Output Resistance
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| MAX829EUK-T | 功能描述:电荷泵 Switched-Capacitor Voltage Inverter 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 |
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| MAX830CWE | 功能描述:直流/直流开关调节器 RoHS:否 制造商:Maxim Integrated 最大输入电压:30 V 开关频率:110 KHz 输出电压: 输出电流:1.7 A (Typ) 输出端数量:1 最大工作温度:+ 70 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-16 Wide |
| MAX830CWE+ | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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