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LT3078

更新时间： 2024-11-10 15:19:15
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
41页 1474K
描述
5.5V, 5A, Ultra-Low Noise, High PSRR, 55mV Dropout Ultra-Fast Linear Regulator

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LT3078 数据手册

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Data Sheet  
LT3078  
5.5V, 5A, Ultra-Low Noise, High PSRR, 55mV Dropout Ultra-Fast Linear Regulator  
FEATURES  
GENERAL DESCRIPTION  
Ultra-low RMS Noise: 1.3μV  
(10Hz to 100kHz)  
The LT®3078 is a low voltage, ultra-low noise, high  
power-supply rejection ratio (PSRR), and ultra-fast  
transient response linear regulator. The device supplies  
up to 5A with a typical dropout voltage of 55mV. A 4.7µF  
reference bypass capacitor decreases output voltage  
noise to 1.3µVRMS (10Hz to 100kHz). The wide  
bandwidth and high PSRR deliver the best performance  
without the need of bulky capacitors, which save space  
and cost. The LT3078 is ideal for powering high-  
performance FPGAs, data converters, RF, and all noise-  
sensitive signal chain applications.  
RMS  
Ultra-low Spot Noise: 3.5nV/√Hz at 10kHz  
Ultra-low1/fNoise:11µV from0.1Hz to 10Hz  
P-P  
High PSRR at High-Frequency: 49dB at 1MHz  
Ultra-fast Transient Response  
Dropout Voltage: 55mV Typical  
Digitally Programmable V  
: 0.5V to 4.2V  
OUT  
High Accuracy: ±1.5% Over Line, Load, and  
Temperature  
Precise Current Monitor: ±3% accuracy at 5A  
Programmable Current Limit: ±3% at 5A  
Input Voltage Range: 0.6V to 5.5V  
Digital Output Margining: ±2.5%  
Stable with Ceramic Output Capacitors (22μF  
Minimum)  
The output voltage is digitally selectable in 50mV  
increments from 0.5V to 1.2V, 100mV increments from  
1.2V to 1.8V, and discrete levels at 2V, 2.5V, 3V, 3.3V,  
and 4.2V. The LT3078’s unity-gain operation provides  
virtually constant output noise, PSRR, and bandwidth  
independent of the programmed output voltage. In  
addition, the LT3078 incorporates a unique tracking  
feature (VIOC) to control the upstream switching  
regulator to maintain a constant voltage across the  
LT3078 and minimize power dissipation.  
Parallel Multiple Devices for Higher Current  
VIOC Pin to Control Upstream Switching Converter  
Precision Enable/Undervoltage Lockout (UVLO)  
Power Good (PG) Flag  
Internal Die Temperature Monitor  
22-Lead (3mm x 4mm) LQFN Package  
A precision current monitor enables system energy  
management and allows the user to minimize input  
power-supply size and cost. Built-in protection  
includes UVLO, internal current limit, and thermal  
shutdown with hysteresis. The LT3078 is available in a  
compact 22-lead (3mm X 4mm) LQFN package  
(Laminate package with QFN footprint).  
APPLICATIONS  
RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs  
High Speed/High Precision Data Converters  
Low Noise Instrumentation  
Post-Regulator for Switching Supplies  
FPGA and DSP Power Supplies  
Medical Applications  
SIMPLIFIED APPLICATION DIAGRAM  
V
OUT  
AC-COUPLED  
20mV/DIV  
V
V
V
= 1.5V  
IN  
= 1.2V  
= 4.5V  
= 22µF  
OUT  
BIAS  
C
OUT  
I
STEP FROM 0.5A TO 5A  
OUT  
I
OUT  
2A/DIV  
tRISE = tFALL = 1µs  
2µs/DIV  
Figure 1. Simplified Application Diagram  
Figure 2. Transient Response  
DOCUMENT FEEDBACK  
T el: 7 8 1. 3 29 . 47 0 0  
TECHNICAL SUPPORT  
© 2023 Analo g D evi ces, Inc. Al l ri ghts rese rve d.  
Rev. 0  
One Analo g Wa y, Wi lm i ngto n, MA 01887 - 2356, U . S . A.  
 
 
 
 
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