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參數(shù)資料
| 型號： | LT1054MH |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switched-Capacitor Voltage Converter with Regulator |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 25 kHz SWITCHING FREQ-MAX, MBCY8 |
| 封裝： | METAL CAN, TO-5, 8 PIN |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 444K |
| 代理商： | LT1054MH |
SLVS033F FEBRUARY 1990 REVISED NOVEMBER 2004
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
regulation
The feedback/shutdown (FB/SD) terminal has two functions. Pulling FB/SD below the shutdown threshold
(
≈
0.45 V) puts the device into shutdown. In shutdown, the reference/regulator is turned off and switching stops.
The switches are set such that both C
IN
and C
OUT
are discharged through the output load. Quiescent current
in shutdown drops to approximately 100
μ
A. Any open-collector gate can be used to put the LT1054 into
shutdown. For normal (unregulated) operation, the device will restart when the external gate is shut off. In
LT1054 circuits that use the regulation feature, the external resistor divider can provide enough pulldown to keep
the device in shutdown until the output capacitor (C
OUT
) has fully discharged. For most applications, where the
LT1054 is run intermittently, this does not present a problem because the discharge time of the output capacitor
is short compared to the off time of the device. In applications where the device has to start up before the output
capacitor (C
OUT
) has fully discharged, a restart pulse must be applied to FB/SD of the LT1054. Using the circuit
shown in Figure 16, the restart signal can be either a pulse (t
p
> 100
μ
s) or a logic high. Diode coupling the restart
signal into FB/SD allows the output voltage to rise and regulate without overshoot. The resistor divider R3/R4
shown in Figure 16 should be chosen to provide a signal level at FB/SD of 0.71.1 V.
FB/SD also is the inverting input of the LT1054 error amplifier and, as such, can be used to obtain a regulated
output voltage.
VIN
R2
R1
R4
R3
Restart
Shutdown
C1
5
6
7
8
+
CIN
10-
μ
F
Tantalum
4
3
2
1
LT1054
VOUT
VREF
OSC
VCC
CAP
GND
CAP+
FB/SD
VOUT
Where: R1 = 20 k
VREF = 2.5 V Nominal
Choose the closest 1% value.
Pin numbers shown are for the P package.
+
2.2
μ
F
For example: To get VO = 5 V,
referenced to the ground terminal of the LT1054
COUT
100-
μ
F
Tantalum
R2
R1
V
OUT
VREF
2
40 mV
1
20 k
|–5 V|
2.5 V
2
40 mV
1
102.6 k
+
Figure 16. Basic Regulation Configuration
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