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參數(shù)資料
| 型號： | LT1738EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Slew Rate Controlled Ultralow Noise DC/DC Controller |
| 中文描述： | 0.3 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 248K |
| 代理商： | LT1738EG |
1
LT1738
1738fa
The LT
1738 is a switching regulator controller designed
to lower conducted and radiated electromagnetic interfer-
ence (EMI). Ultralow noise and EMI are achieved by
controlling the voltage and current slew rates of an exter-
nal N-channel MOSFET switch. Current and voltage slew
rates can be independently set to optimize harmonic
content of the switching waveforms vs efficiency. The
LT1738 can reduce high frequency harmonic power by as
much as 40dB with only minor losses in efficiency.
The LT1738 utilizes a current mode architecture opti-
mized for single switch topologies such as boost, flyback
and Cuk. The IC includes gate drive and all necessary
oscillator, control and protection circuitry. Unique error
amp circuitry can regulate both positive and negative
voltages. The internal oscillator may be synchronized to
an external clock for more accurate placement of switch-
ing harmonics.
Protection features include gate drive lockout for low V
IN
,
soft-start, output current limit, short-circuit current limit-
ing, gate drive overvoltage clamp and input supply
undervoltage lockout.
I
Greatly Reduced Conducted and Radiated EMI
I
Low Switching Harmonic Content
I
Independent Control of Output Switch Voltage and
Current Slew Rates
I
Greatly Reduced Need for External Filters
I
Single N-Channel MOSFET Driver
I
20kHz to 250kHz Oscillator Frequency
I
Easily Synchronized to External Clock
I
Regulates Positive and Negative Voltages
I
Easier Layout Than with Conventional Switchers
I
Power Supplies for Noise Sensitive Communication
Equipment
I
EMI Compliant Offline Power Supplies
I
Precision Instrumentation Systems
I
Isolated Supplies for Industrial Automation
I
Medical Instruments
I
Data Acquisition Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Ultralow Noise 5V to 12V Converter
3
10
11
13
SHDN
CAP
NFB
LT1738
GND
V
IN
17
14
2
GCL
SS
V5
SYNC
GATE
5
6
1
C
T
R
T
7
8
R
CSL
16
V
C
15
12
R
VSL
CS
4
PGND
20
FB
9
5pF
Si9426
10nF
1.5k
3.3k
25k
25k
3.3k
16.9k
1.3nF
22nF
0.22
μ
F
21.5k
2.5k
10
μ
H
OPTIONAL
150
μ
F
OSCON
4
×
150
μ
F
OSCON
12V
1A
MBRD620
5V
V
IN
100
μ
F
P3
22
μ
H
1738 TA01
+
+
+
A
B
25m
12V Output Noise
(Bandwidth = 100MHz)
400
μ
V
P-P
5
μ
s/DIV
1738 TA01a
Slew Rate Controlled
Ultralow Noise DC/DC Controller
DESCRIPTIO
U
APPLICATIU
FEATURES
TYPICAL APPLICATIO
U
POINT
B
ON SCHEMATIC
50mV/DIV
POINT
A
ON SCHEMATIC
500
μ
V/DIV
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1738EG#PBF | 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LT1738EG#TR | 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1738EG#TRPBF | 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT1738IG | 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT1738IG#PBF | 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
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