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| 型号： | TPS60401DBVTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 28 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | GREEN, PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 23/28页 |
| 文件大小： | 787K |
| 代理商： | TPS60401DBVTG4 |
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TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60mA CHARGE PUMP VOLTAGE INVERTER
SLVS324A JULY 2001 REVISED NOVEMBER 2004
4
WWW.TI.COM
efficiency considerations (continued)
The efficiency of the TPS6040x devices is dominated by their quiescent supply current at low output current and
by their output impedance at higher current.
h ^
I
O
I
O )
I
Q
1
*
I
O
R
O
V
I
Where, IQ = quiescent current.
capacitor selection
To maintain the lowest output resistance, use capacitors with low ESR (see Table 1). The charge-pump output
resistance is a function of C(fly)’s and CO’s ESR. Therefore, minimizing the charge-pump capacitor’s ESR
minimizes the total output resistance. The capacitor values are closely linked to the required output current and
the output noise and ripple requirements. It is possible to only use 1-
F capacitors of the same type.
input capacitor (CI)
Bypass the incoming supply to reduce its ac impedance and the impact of the TPS6040x switching noise. The
recommended bypassing depends on the circuit configuration and where the load is connected. When the
inverter is loaded from OUT to GND, current from the supply switches between 2 x IO and zero. Therefore, use
a large bypass capacitor (e.g., equal to the value of C(fly)) if the supply has high ac impedance.
flying capacitor (C(fly))
Increasing the flying capacitor’s size reduces the output resistance. Small values increases the output
resistance. Above a certain point, increasing C(fly)’s capacitance has a negligible effect, because the output
resistance becomes dominated by the internal switch resistance and capacitor ESR.
output capacitor (CO)
Increasing the output capacitor’s size reduces the output ripple voltage. Decreasing its ESR reduces both output
resistance and ripple. Smaller capacitance values can be used with light loads if higher output ripple can be
tolerated. Use the following equation to calculate the peak-to-peak ripple.
V
O(ripple) +
I
O
fosc
Co
) 2
I
O
ESR
CO
Table 1. Recommended Capacitor Values
DEVICE
VI
[V]
IO
[mA]
CI
[
F]
C(fly)
[
F]
CO
[
F]
TPS60400
1.8
…5.5
60
1
TPS60401
1.8
…5.5
60
10
TPS60402
1.8
…5.5
60
3.3
TPS60403
1.8
…5.5
60
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS60401QDBVRQ1 | 功能描述:电荷泵 Auto Cat Unreg 60mA Chg Pump Vltg Invrtr 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 |
| TPS60402 | 制造商:TI 制造商全称:Texas Instruments 功能描述:UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER |
| TPS60402DBV | 制造商:TI 制造商全称:Texas Instruments 功能描述:UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER |
| TPS60402DBVR | 功能描述:电荷泵 60mA Charge Pump 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 |
| TPS60402DBVRG4 | 功能描述:电荷泵 60mA Charge Pump 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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