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參數(shù)資料
| 型號(hào)： | LT1940EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 3.2 A DUAL SWITCHING CONTROLLER, 1350 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件頁(yè)數(shù)： | 1/20頁(yè) |
| 文件大?。?/td> | 256K |
| 代理商： | LT1940EFE |
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LT1940
1
1940i
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Final Electrical Specifications
I
Disk Drives
I
DSP Power Supplies
I
Wall Transformer Regulation
I
Distributed Power Regulation
I
DSL Modems
I
Cable Modems
I
Wide Input Voltage Range: 3.6V to 25V
I
Two 1.4A Output Switching Regulators with
Internal Power Switches
I
Small 16-Lead TSSOP Surface Mount Package
I
Constant 1.1MHz Switching Frequency
I
Anti-Phase Switching Reduces Ripple
I
Independent Shutdown/Soft-Start Pins
I
Independent Power Good Indicators Ease
Supply Sequencing
I
Uses Small Inductors and Ceramic Capacitors
APPLICATIOU
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Dual Monolithic 1.4A,
1.1MHz Step-Down Switching Regulator
August 2002
The LT
1940 is a dual current mode PWM step-down
DC/DC converter with internal 2A power switches. Both
converters are synchronized to a single 1.1MHz oscillator
and run with opposite phases, reducing input ripple cur-
rent. The output voltages are set with external resistor
dividers, and each regulator has independent shutdown
and soft-start circuits. Each regulator generates a power-
good signal when its output is in regulation, easing power
supply sequencing and interfacing with microcontrollers
and DSPs.
The LT1940’s 1.1MHz switching frequency allows the use
of tiny inductors and capacitors, resulting in a very small
dual 1.4A output solution. Constant frequency and ce-
ramic capacitors combine to produce low, predictable
output ripple voltage. With its wide input range of 3.6V to
25V, the LT1940 regulates a wide variety of power sources,
from 4-cell batteries and 5V logic rails to unregulated wall
transformers, lead acid batteries and distributed-power
supplies. A current mode PWM architecture provides fast
transient response with simple compensation compo-
nents and cycle-by-cycle current limiting. Frequency
foldback and thermal shutdown provide additional protec-
tion.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Figure 1. 3.3V and 5V Dual Output Step-Down
Converter with Output Sequencing
Efficiency vs Load Current
V
IN
7V TO 25V
BOOST1
SW1
FB1
V
C1
RUN/SS1
RUN/SS2
BOOST2
SW2
FB2
V
C2
PG1
PG2
LT1940
V
IN
GND
1940 F01
330pF
10
μ
F
10
μ
F
4.7
μ
F
0.1
μ
F
0.1
μ
F
15k
330pF
15k
10.0k
16.5k
100k
30.1k
10.0k
4.7
μ
H
3.3
μ
H
POWER
GOOD
OUT2
5V
1.4A
OUT1
3.3V
1.4A
UPS140
UPS140
CMDSH-3
1nF
CMDSH-3
LOAD CURRENT (A)
0
E
100
90
80
70
60
0.5
1.0
1940 F01b
1.5
V
IN
= 12V
V
OUT
= 5V
V
OUT
= 3.3V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1940EFE#PBF | 功能描述:IC REG BUCK ADJ 1.4A DL 16TSSOP 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 |
| LT1940EFE#TR | 功能描述:IC REG BUCK ADJ 1.4A DL 16TSSOP 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1940EFE#TRPBF | 功能描述:IC REG BUCK ADJ 1.4A DL 16TSSOP 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1940EFEPBF | 制造商:Linear Technology 功能描述:LT1940 adj 1.4A SD dc-dc converter |
| LT1940LEFE | 功能描述:IC REG BUCK ADJ 1.4A DL 16TSSOP 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: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(kāi)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(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán) |
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