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LT3029_11

更新时间： 2024-02-17 03:54:43
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
20页 338K
描述
Dual 500mA/500mA Low Dropout, Low Noise, Micropower Linear Regulator

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LT3029_11 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
n
n
n
n
General Purpose Linear Regulator  
Battery-Powered Systems  
Microprocessor Core/Logic Supplies  
Post Regulator for Switching Supplies  
Tracking/Sequencing Power 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.  
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  
3029fa  
1
1234567...20

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