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LT3029

更新时间： 2023-12-18 00:00:00
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
20页 1587K
描述
Dual 500mA/500mA Low Dropout, Low Noise, Micropower Linear Regulator

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LT3029 数据手册

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LT3029  
Dual 500mA/500mA  
Low Dropout, Low Noise,  
Micropower Linear Regulator  
DESCRIPTION  
FEATURES  
The LT®3029 is a dual, micropower, low noise, low drop-  
out linear regulator. The device operates either with a  
common input supply or independent input supplies for  
each channel, over an input voltage range of 1.8V to 20V.  
Each output supplies up to 500mA of output current with  
a typical dropout voltage of 300mV. Quiescent current is  
well controlled in dropout. With an external 10nF bypass  
n
Output Current: 500mA per Channel  
n
Low Dropout Voltage: 300mV  
n
Low Noise: 20μV  
(10Hz to 100kHz)  
RMS  
n
n
Low Quiescent Current: 55μA per Channel  
Wide Input Voltage Range: 1.8V to 20V (Common or  
Independent Input Supply)  
n
n
Adjustable Output: 1.215V Reference Voltage  
Very Low Quiescent Current in Shutdown: <1μA per  
Channel  
Stable with 3.3μF Minimum Output Capacitor  
Stable with Ceramic, Tantalum or Aluminum  
Electrolytic Capacitors  
Reverse-Battery and Reverse Output-to-Input  
Protection  
Current Limit with Foldback and Thermal Shutdown  
Tracking/Sequencing Capability: Compatible with  
LTC292X Power Supply Tracking ICs  
Thermally Enhanced 16-Lead MSOP and 16-Lead  
(4mm × 3mm) DFN Packages  
capacitor, output noise is only 20μV  
over a 10Hz to  
RMS  
100kHz bandwidth. Designed for use in battery-powered  
systems,thelow55μAquiescentcurrentperchannelmakes  
it an ideal choice. In shutdown, quiescent current drops to  
less than 1μA. Shutdown control is independent for each  
channel, allowing for flexible power management.  
n
n
n
TheLT3029optimizesstabilityandtransientresponsewith  
low ESR ceramic output capacitors, requiring a minimum  
of only 3.3μF. The regulator does not require the addition  
of ESR, as is common with other regulators.  
n
n
n
Internal circuitry provides reverse-battery protection,  
reverse-current protection, current limiting with foldback  
and thermal shutdown. The device is available as an  
adjustable output voltage device with a 1.215V reference  
voltage. The LT3029 is offered in the thermally enhanced  
16-lead MSOP and 16-lead, low profile (4mm × 3mm ×  
0.75mm) DFN packages.  
APPLICATIONS  
n
General Purpose Linear Regulator  
n
Battery-Powered Systems  
n
Microprocessor Core/Logic Supplies  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
n
Post Regulator for Switching Supplies  
n
Tracking/Sequencing Power Supplies  
Dropout Voltage vs Load Current  
TYPICAL APPLICATION  
400  
T
= 25°C  
2.5VIN to 1.5V/1.8V Application  
J
350  
300  
250  
200  
150  
100  
50  
V
IN  
2.5V  
V
OUT1  
IN1  
OUT1  
LT3029  
1.8V  
10nF  
500mA  
113k  
1%  
3.3μF  
3.3μF  
3.3μF  
BYP1  
ADJ1  
IN2  
237k  
1%  
SHDN1  
V
OUT2  
1.5V  
SHDN2 OUT2  
500mA  
10nF  
54.9k  
1%  
BYP2  
ADJ2  
0
237k  
1%  
GND  
0
50 100 150 200 250 300 350 400 450 500  
OUTPUT CURRENT (mA)  
3029 TA01b  
3029 TA01  
3029f  
1
1234567...20

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