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參數(shù)資料
| 型號： | REG711EA-5/2K5 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.005 A SWITCHED CAPACITOR REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, MSOP-8 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 349K |
| 代理商： | REG711EA-5/2K5 |
REG711
7
SBVS027A
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 Q1 and Q3 are held off,
Q4 is on, and Q2 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 CPUMP charges to VIN. During the second
half cycle the FET switches are configured as shown in
Figure 2B, and the voltage on CPUMP is added to VIN. 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 (CIN) 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 VIN is
greater than or equal to minimum VIN and the input quies-
cent current is reduced to 2
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
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
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
ON
+
–
(B)
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