參數(shù)資料
型號(hào)： LTC3554EPD#TRPB
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.5 A BATTERY CHARGE CONTROLLER, 1295 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 3 X 3 MM, 0.55 MM HEIGHT, LEAD FREE, PLASTIC, UTQFN-20
文件頁(yè)數(shù)： 18/36頁(yè)
文件大小： 418K
代理商： LTC3554EPD#TRPB
LTC3554
25
3554p
and DCR losses, and will not give the best efciency. The
choice of which style inductor to use often depends more
on the price versus size, performance and any radiated
EMI requirements than on what the step-down switching
regulators requires to operate.
The inductor value also has an effect on Burst Mode
operation. Lower inductor values will cause Burst Mode
switching frequency to increase.
Input/Output Capacitor Selection
Low ESR (equivalent series resistance) ceramic capacitors
should be used at both step-down switching regulator
outputs as well as at the step-down switching regulator
input supply. Only X5R or X7R ceramic capacitors should
be used because they retain their capacitance over wider
voltage and temperature ranges than other ceramic types.
For good transient response and stability the output capaci-
tor for each step-down switching regulator should retain at
least 4μF of capacitance over operating temperature and
bias voltage. Generally, a good starting point is to use a
10μF output capacitor.
The switching regulator input supply should be bypassed
with a 2.2μF capacitor. Consult with capacitor manufac-
turers for detailed information on their selection and
specications of ceramic capacitors. Many manufacturers
now offer very thin (<1mm tall) ceramic capacitors ideal
for use in height-restricted designs. Table 2 shows a list
of several ceramic capacitor manufacturers.
PUSHBUTTON INTERFACE
State Diagram/Operation
Figure 6 shows the LTC3554 pushbutton state diagram.
Figure 6. Pushbutton State Diagram
3554 F06
PUP2
PDN1
PDN2
HRST
POR
PWR_ONx
AND UVLO
PWR_ONx
EXTPWR OR
PB400MS
1SEC
5SEC
1SEC
PON
POFF
PUP1
HR
PWR_ONx
OR UVLO
EXTPWR OR
PB400MS
Upon rst application of power, VBUS or BAT, an inter-
nal power on reset (POR) signal places the pushbutton
circuitry into the power-down (PDN1) state. One second
after entering the PDN1 state the pushbutton circuitry will
transition into the hard reset (HR) state.
OPERATION
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC3554EUD-1#PBF 功能描述:IC USB POWER MANAGER 20QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:PowerPath™ 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)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(lèi)型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱(chēng):LP3905SD-30DKR
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