參數(shù)資料
型號(hào): LT1944
廠商: Linear Technology Corporation
英文描述: 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
中文描述: 具有1.4A,1.5MHz同步升壓型DC / DC轉(zhuǎn)換器輸出斷開(kāi)
文件頁(yè)數(shù): 1/16頁(yè)
文件大?。?/td> 339K
代理商: LT1944
LTC3458
1
3458f
FEATURES
DESCRIPTIOU
APPLICATIU
Point-of-Load Regulators
USB V
BUS
Power
LCD Bias
OLED Displays
TYPICAL APPLICATIO
U
High Efficiency: Up to 93%
Inrush Current Limiting and Output Disconnect
Programmable Output Voltages up to 7.5V
1.5V to 6V Input Range
Programmable/Synchronizable Fixed Frequency
Operation up to 1.5MHz
Programmable Automatic Burst Mode
Operation
Current Mode Control with Programmable Soft-Start
Period and Peak Current Limit
700mA at 7V from 5V Input
0.3
N-Channel and 0.4
P-Channel 1.4A Switches
at 5V
OUT
Ultralow Quiescent Currents: 15
μ
A Sleep, <1
μ
A in
Shutdown
3mm
×
4mm Thermally Enhanced DFN Package
1.4A, 1.5MHz Synchronous
Step-Up DC/DC Converter
with Output Disconnect
The LTC
3458 is a high efficiency, current mode, fixed
frequency, step up DC/DC converter with true output
disconnect and inrush current limiting. The LTC3458 is
rated for a 7.5V output and includes a 0.3
N-channel
MOSFET switch and a 0.4
P-channel MOSFET synchro-
nous rectifier. The LTC3458 is well suited for battery
powered applications and includes programmable output
voltage, switching frequency and loop compensation. The
oscillator frequency can be set up to 1.5MHz or synchro-
nized to an external clock.
Quiescent current is only 15
μ
A during Burst Mode opera-
tion maximizing battery life in portable applications. The
Burst Mode current threshold, peak current limit, and soft-
start are externally programmable. Other features include
<1
μ
A shutdown current, antiringing control, and thermal
limit. The LTC3458 is available in a low profile (0.75mm),
3mm
×
4mm 12-pin DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
USB to 7V at 1MHz
COEV
10
H
DQ7545
USB to 7V
OUT
V
IN
GND/PGND
SHDN
SYNC
R
T
I
LIM
SW
V
OUT
FB
COMP
SS
BURST
LTC3458
USB
4.35V to 5.25V
2.2
μ
F
ON OFF
200k
124k
133k
316k
33k
0.01
μ
F
0.01
μ
F
560pF
10pF
10pF
1.5M
22
μ
F
X5R
V
OUT
7V
500mA
3458 TA01a
LOAD CURRENT (mA)
E
P
100
95
90
85
80
75
70
1000
10
0.1
0.1
10
100
1000
3458 TA01b
1
5.25V
IN
4.35V
IN
POWER LOSS
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PDF描述
LT1944-1 Dual Micropower Step-Up DC/DC Converter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1944-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Micropower Step-Up DC/DC Converter
LT1944-1EMS 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP 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
LT1944-1EMS#PBF 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP 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
LT1944-1EMS#TR 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP 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
LT1944-1EMS#TRPBF 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP 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: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