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參數(shù)資料
| 型號(hào)： | LT1945IMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 121K |
| 代理商： | LT1945IMS |
LT1945
1
1945fa
TYPICAL APPLICATION
DESCRIPTION
Dual Micropower DC/DC
Converter with Positive and
Negative Outputs
1945 is a dual micropower DC/DC converter in a
10-pin MSOP package. Each converter is designed with
a 350mA current limit and an input voltage range of 1.2V
to 15V, making the LT1945 ideal for a wide variety of ap-
plications. Both converters feature a quiescent current of
only 20μA at no load, which further reduces to 0.5μA in
shutdown. A current limited, xed off-time control scheme
conserves operating current, resulting in high efciency
over a broad range of load current. The 36V switch allows
high voltage outputs up to
±34V to be easily generated
without the use of costly transformers. The LT1945’s
low off-time of 400ns permits the use of tiny, low prole
inductors and capacitors to minimize footprint and cost
in space-conscious portable applications.
Dual Output (+12V, –20V) Converter
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
n Small TFT LCD Panels
n Handheld Computers
n Battery Backup
n Digital Cameras
n Generates Well-Regulated Positive and
Negative Outputs
n Low Quiescent Current:
20μA in Active Mode (per Converter)
<1μA in Shutdown Mode
n Operates with VIN as Low as 1.2V
n Low VCESAT Switch: 250mV at 300mA
n Uses Small Surface Mount Components
n High Output Voltage: Up to
±34V
n Tiny 10-Pin MSOP Package
Efciency at VIN = 3.6V
VIN
SW1
FB2
LT1945
4
3
L1
10μH
D1
D2
SHDN2
24.9k
365k
C2
1μF
–20V
10mA
VIN
2.7V
TO 5V
1945 TA01
GND
7
PGND
9
PGND
6
810
SW2
4.7pF
C1
4.7μF
C4
0.1μF
NFB1
2
5
1
SHDN1
L2
10μH
D3
1M
115k
C3
1μF
100pF
C1: TAIYO YUDEN JMK212BJ475
C2, C3: TAIYO YUDEN TMK316BJ105
C4: TAIYO YUDEN EMK107BJ104
D1, D2, D3: ZETEX ZHCS400
L1, L2: MURATA LQH3C100
12V
20mA
LOAD CURRENT (mA)
0.1
EFFICIENCY
(%)
1
10
100
1945 TA01a
90
85
80
75
70
65
60
55
50
+12V OUTPUT
–20V OUTPUT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1945IMS#PBF | 功能描述:IC REG MULTI CONFIG ADJ 10MSOP 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: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 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 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 |
| LT1945IMS#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 10MSOP 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: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 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 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 |
| LT1946 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start |
| LT1946/LT1946A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm 3mm DFN |
| LT1946A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.2MHz Step-Up DC/DC Converter in SOT-23 |
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