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參數(shù)資料
| 型號： | LTC3554EUD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.6 A BATTERY CHARGE CONTROLLER, 2590 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 16/36頁 |
| 文件大?。?/td> | 418K |
| 代理商： | LTC3554EUD#PBF |
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LTC3554/LTC3554-2
23
35542fb
OPERATION
When FSEL is low, the frequency of the switching regulators
is reduced to 1.125Mhz. The slower switching frequency
reduces switching losses and raises efciency as shown
in Figures 4 and 5. Switch node slew rate is also increased
to minimize transition losses. As the programmed output
voltage decreases, the difference in efciency is more
appreciable.
Low Supply Operation
An undervoltage lockout circuit on the VOUT pin (VOUT
UVLO) shuts down the step-down switching regulators
when VOUT drops below about 2.6V. It is thus recom-
mended that the step-down switching regulator input
supply (BVIN) be connected directly to the power path
output (VOUT). The UVLO prevents the step-down switch-
ing regulators from operating at low supply voltages
where loss of regulation or other undesirable operation
may occur. If driving the step-down switching regulator
input supply from a voltage other than the VOUT pin, the
regulators should not be operated outside the specied
operating range as operation is not guaranteed beyond
this range.
Inductor Selection
Many different sizes and shapes of inductors are avail-
able from numerous manufacturers. Choosing the right
inductor from such a large selection of devices can be
overwhelming, but following a few basic guidelines will
make the selection process much simpler.
Figure 4. 1.2V Output Efciency and Power Loss
vs Load Current
Figure 5. 3.3V Output Efciency and Power Loss
vs Load Current
LOAD CURRENT (mA)
0.01
0.1
0
EFFICIENCY
(%)
POWER
LOSS
(mW)
70
100
1
10
100
1000
LTXXXX GXX
60
50
40
30
20
10
80
0
1000
10
1
0.1
100
90
BAT = 3.8V
FSEL = L
FSEL = H
EFFICIENCY
POWER LOSS
LOAD CURRENT (mA)
0.01
0.1
0
EFFICIENCY
(%)
POWER
LOSS
(mW)
70
100
1
10
100
1000
LTXXXX GXX
60
50
40
30
20
10
80
0
1000
10
1
0.1
100
90
BAT = 3.8V
FSEL = L
FSEL = H
EFFICIENCY
POWER LOSS
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| LTC3555EUFD-1#PBF | 功能描述:IC USB POWER HE 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
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