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參數(shù)資料
| 型號(hào)： | LT1054L |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Switched-Capacitor Voltage Converter with Regulator(帶穩(wěn)壓器的開(kāi)關(guān)電容電壓轉(zhuǎn)換器) |
| 中文描述： | 開(kāi)關(guān)電容電壓轉(zhuǎn)換器穩(wěn)壓器（帶穩(wěn)壓器的開(kāi)關(guān)電容電壓轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 281K |
| 代理商： | LT1054L |
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8
LT1054/LT1054L
APPLICATIO
S I
N
FOR
ATIO
U
W
U
voltage. For the basic configuration,
|
V
OUT
|
referred to the
ground pin of the LT1054 must be less than the total of the
supply voltage minus the voltage loss due to the switches.
The voltage loss versus output current due to the switches
can be found in Typical Performance Characteristics. Other
configurations such as the negative doubler can provide
higher output voltages at reduced output currents (see
Typical Applications).
Capacitor Selection
For unregulated circuits the nominal values of C
IN
and C
OUT
should be equal. For regulated circuits see the section on
Regulation. While the exact values of C
IN
and C
OUT
are
noncritical, good quality, low ESR capacitors such as solid
tantalum are necessary to minimize voltage losses at high
currents. For C
IN
the effect of the ESR of the capacitor will
be multiplied by four due to the fact that switch currents are
approximately two times higher than output current and
losses will occur on both the charge and discharge cycle.
This means that using a capacitor with 1
of ESR for C
IN
will have the same effect as increasing the output imped-
ance of the LT1054 by 4
. This represents a significant
increase in the voltage losses. For C
OUT
the affect of ESR is
less dramatic. C
OUT
is alternately charged and discharged
at a current approximately equal to the output current and
the ESR of the capacitor will cause a step function to occur
in the output ripple at the switch transitions. This step
function will degrade the output regulation for changes in
output load current and should be avoided. Realizing that
large value tantalum capacitors can be expensive, a tech-
nique that can be used is to parallel a smaller tantalum
capacitor with a large aluminum electrolytic capacitor to
gain both low ESR and reasonable cost. Where physical
size is a concern some of the newer chip type surface
mount tantalum capacitors can be used. These capacitors
are normally rated at working voltages in the 10V to 20V
range and exhibit very low ESR (in the range of 0.1
).
Output Ripple
The peak-to-peak output ripple is determined by the value
of the output capacitor and the output current. Peak-to-
peak output ripple may be approximated by the formula:
dV = I
OUT
2fC
OUT
R4
RESTART SHUTDOWN
)
C1
R2
C
IN
10
μ
F
TANTALUM
C
OUT
100
μ
F
TANTALUM
V
OUT
LT1054 F05
V
IN
R1
2.2
μ
F
+
R3
R2
≈
+ 1
WHERE V
REF
= 2.5V NOMINAL
FOR EXAMPLE: TO GET V
= –5V REFERRED TO THE GROUND
PIN OF THE LT1054, CHOOSE R1 = 20k, THEN
*CHOOSE THE CLOSEST 1% VALUE
|
V
OUT
|
V
REF
2
– 40mV
R2 = 20k
= 102.6k*
+ 1
|
–5V
|
2.5V
2
– 40mV
)
)
+ 1
|
V
OUT
|
1.21V
LT1054
GND
FB/SHDN
CAP
+
CAP
–
V
+
OSC
V
REF
V
OUT
+
+
Figure 5
20k or greater because the reference output current is
limited to
≈
100
μ
A. R2 should be chosen to be in the range
of 100k to 300k. For optimum results the ratio of C
IN
/C
OUT
is recommended to be 1/10. C1, required for good load
regulation at light load currents, should be 0.002
μ
F for all
output voltages.
A new die layout was required to fit into the physical
dimensions of the S8 package. Although the new die of the
LT1054CS8 will meet all the specifications of the existing
LT1054 data sheet, subtle differences in the layout of the
new die require consideration in some application cir-
cuits. In regulating mode circuits using the 1054CS8 the
nominal values of the capacitors, C
IN
and C
OUT
, must be
approximately equal for proper operation at elevated
junction temperatures. This is different from the earlier
part. Mismatches within normal production tolerances
for the capacitors are acceptable. Making the nominal
capacitor values equal will ensure proper operation at
elevated junction temperatures at the cost of a small
degradation in the transient response of regulator cir-
cuits. For unregulated circuits the values of C
IN
and C
OUT
are normally equal for all packages. For S8 applications
assistance in unusual applications circuits, please consult
the factory.
It can be seen from the circuit block diagram that the
maximum regulated output voltage is limited by the supply
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| LT1054LCS8 | 功能描述:IC REG MULTI CONFIG ADJ 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1054LCS8#PBF | 功能描述:IC REG MULTI CONFIG ADJ 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT1054LCS8#PBF | 制造商:Linear Technology 功能描述:DC/DC Controller IC |
| LT1054LCS8#TR | 功能描述:IC REG MULTI CONFIG ADJ 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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