- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378130 > REG711EA-2.7 (Texas Instruments, Inc.) 50mA SWITCHED-CAP DC/DC CONVERTER PDF資料下載
參數(shù)資料
| 型號： | REG711EA-2.7 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 50mA SWITCHED-CAP DC/DC CONVERTER |
| 中文描述： | 50mA的開關第直流/直流轉換器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 181K |
| 代理商： | REG711EA-2.7 |
REG711
SBVS027A
7
THEORY OF OPERATION
The REG711 regulated charge pump provides a regulated
output voltage for input voltages ranging from less than the
output to greater than the output. This is accomplished by
automatic mode switching within the device. When the input
voltage is greater than the required output, the unit functions
as a variable pulse-width switch-mode regulator. This opera-
tion is shown in Figure 1. Transistors Q
1
and Q
3
are held off,
Q
4
is on, and Q
2
is switched as needed to maintain a
regulated output voltage.
A conversion clock of 50% duty cycle is generated. During
the first half cycle the FET switches are configured as shown
in Figure 2A, and C
PUMP
charges to V
IN
. During the second
half cycle the FET switches are configured as shown in
Figure 2B, and the voltage on C
PUMP
is added to V
IN
. The
output voltage is regulated by skipping clock cycles as
necessary.
PEAK CURRENT REDUCTION
In normal operation, the charging of the pump and output
capacitors usually leads to relatively high peak input cur-
rents which can be much higher than that of the average load
current. The regulator incorporates circuitry to limit the
input peak current, lowering the total EMI production of the
device and lowering output voltage ripple and input current
ripple. Input capacitor (C
IN
) supplies most of the charge
required by input current peaks.
PROTECTION
The regulator has thermal shutdown circuitry that protects it
from damage caused by overload conditions. The thermal
protection circuitry disables the output when the junction
temperature reaches approximately 160
°
C, allowing the de-
vice to cool. When the junction temperature cools to ap-
proximately 140
°
C, the output circuitry is automatically re-
enabled. Continuously running the regulator into thermal
shutdown can degrade reliability. The regulator also pro-
vides current limit to protect itself and the load.
SHUTDOWN MODE
A control pin on the regulator can be used to place the device
into an energy-saving shutdown mode. In this mode, the
output is disconnected from the input as long as V
IN
is
greater than or equal to minimum V
IN
and the input quies-
cent current is reduced to 2
μ
A maximum.
FIGURE 1. Simplified Schematic of the REG711 Operating
in the Step-Down Mode.
When the input voltage is less than the required output
voltage, the device switched to a step-up or boost mode of
operation, as shown in Figure 2.
FIGURE 2. Simplified Schematic of the REG711 Operating in the Step-Up or Boost Mode.
C
PUMP
C
IN
C
OUT
V
OUT
V
IN
Q
1
Q
3
Q
2
Q
4
OFF
OFF
SWITCHED
ON
Step-Down (Buck) Mode
C
PUMP
–
C
IN
C
OUT
V
OUT
V
IN
Q
1
Q
3
Q
2
Q
4
OFF
ON
ON
OFF
Step-Up (Boost) Mode
(A)
C
PUMP
–
C
IN
C
OUT
V
OUT
V
IN
Q
1
Q
3
Q
2
Q
4
ON
OFF
OFF
ON
(B)
相關PDF資料 |
PDF描述 |
|---|---|
| REG711EA-3 | 50mA SWITCHED-CAP DC/DC CONVERTER |
| REG711EA-3.3 | N CR PL LMR400 NEXCOTE/HEX NUT |
| REG711EA-5 | 50mA SWITCHED-CAP DC/DC CONVERTER |
| REG711 | 50mA SWITCHED-CAP DC/DC CONVERTER |
| RF-HDT-KMAB | 13.56 MHz Vicinity Key Fob Transponder |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| REG711EA27250G4 | 功能描述:直流/直流開關調節(jié)器 50mA Switched-Cap DC/DC Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| REG711EA-3 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:50mA SWITCHED-CAP DC/DC CONVERTER |
| REG711EA-3.3 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:50mA SWITCHED-CAP DC/DC CONVERTER |
| REG711EA-3.3/250 | 功能描述:電荷泵 50mA Switched-Cap DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| REG711EA-3.3/250G4 | 功能描述:電荷泵 50mA Switched-Cap DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復。