參數(shù)資料
型號(hào)： LT1054Y
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, UUC8
封裝： DIE
文件頁(yè)數(shù)： 30/30頁(yè)
文件大?。?/td> 607K
代理商： LT1054Y
LT1054
SWITCHED-CAPACITOR VOLTAGE CONVERTERS
WITH REGULATORS
SLVS033F FEBRUARY 1990 REVISED NOVEMBER 2004
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Supply voltage VCC alternately charges CIN to the input voltage when CIN is switched in parallel with the input supply
and then transfers charge to COUT when CIN is switched in parallel with COUT. Switching occurs at the oscillator
frequency. During the time that CIN is charging, the peak supply current is approximately 2.2 times the output current.
During the time that CIN is delivering a charge to COUT, the supply current drops to approximately 0.2 times the output
current. An input supply bypass capacitor supplies part of the peak input current drawn by the LT1054 and averages
the current drawn from the supply. A minimum input-supply bypass capacitor of 2
μF, preferably tantalum or some
other low equivalent-series-resistance (ESR) type, is recommended. A larger capacitor is desirable in some cases.
An example of this would be when the actual input supply is connected to the LT1054 through long leads or when
the pulse currents drawn by the LT1054 might affect other circuits through supply coupling.
In addition to being the output terminal, VOUT is tied to the substrate of the device. Special care must be taken in
LT1054 circuits to avoid making VOUT positive with respect to any of the other terminals. For circuits with the output
load connected from VCC to VOUT or from some external positive supply voltage to VOUT, an external transistor must
be added (see Figure 14). This transistor prevents VOUT from being pulled above GND during startup. Any small
general-purpose transistor such as a 2N2222 or a 2N2219 device can be used. Resistor R1 should be chosen to
provide enough base drive to the external transistor so that it is saturated under nominal output voltage and maximum
output current conditions.
R1
v
V
OUT b
I
OUT
R1
CIN
Load
VOUT
VREF
OSC
VCC
CAP
GND
CAP+
FB/SD
VIN
VOUT
COUT
Pin numbers shown are for the P package.
+
1
2
3
4
LT1054
8
7
6
5
Figure 14. Circuit With Load Connected from VCC to VOUT
(4)
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