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參數(shù)資料
| 型號： | LTC3456EUF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | ECONOLINE: RSZ/P - 1kVDC |
| 中文描述： | 0.9 A BATTERY CHARGE CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24 |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 358K |
| 代理商： | LTC3456EUF |
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18
LTC3456
3456f
RESET
The LTC3456 contains a RESET circuitry that is active
during both power-up and shutdown. The RESET pin is
held low during initial power-up. When both the V
INT
and
Core outputs come into regulation, a reset delay timer gets
activated. There is a full 262ms timeout before RESET is
released. During power-off mode RESET is pulled low.
This prevents the microprocessor from entering into any
spurious operating mode.
MODE
The LTC3456 has a user selectable MODE pin. When the
MODE pin is pulled logic high and the LTC3456 is battery
powered, the device will automatically enter into Burst
Mode operation under light load current situations. If the
load current in either of the regulators falls below a
predetermined value, the regulator will enter into Burst
Mode operation independent of the other regulator. When
the MODE pin is connected to ground, continuous PWM
operation is selected. It provides the lowest output voltage
ripple and current ripple, albeit at the cost of lower
efficiency under light load conditions.
OPERATIOU
The Burst Mode operation is disabled when the device is
USB or wall powered. The device operates in forced PWM
mode when powered from USB or wall input (irrespective
of the state of the MODE pin). Also, at initial power up, the
device operates in forced PWM mode during the 262ms
initial delay timeout.
Figure 9 shows the Main and Core converters in Burst
Mode operation.
PWRKEY
V
CORE
PWRKEY
PULLED LOW
PWRKEY
RELEASED
RESET
262ms
TIMEOUT
POWER-ON SEQUENCE
POWER-OFF SEQUENCE
PWRON
PBSTAT
3456 F08
Figure 8. Power-On/Power-Off Sequence
Figure 9. The LTC3456 in Burst Mode Operation
V
100mV/DIV
(AC COUPLED)
V
CORE
100mV/DIV
(AC COUPLED)
I
L1
100mA/DIV
I
L2
500mA/DIV
20
μ
s/DIV
V
BATT
= 2.4V
I
MAIN
= 37.5mA
I
CORE
= 6.2mA
3456 F09
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| LTC3456EUF#PBF | 功能描述:IC CONV DC/DC USB BATT 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 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:LP3905SD-30DKR |
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| LTC3458 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LTC3458EDE | 功能描述:IC REG BOOST SYNC ADJ 1.4A 12DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 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，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3458EDE#PBF | 功能描述:IC REG BOOST SYNC ADJ 1.4A 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(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)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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