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ZLED7012

更新时间： 2024-11-24 01:10:51
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艾迪悌 - IDT /
页数 文件大小 规格书
14页 313K
描述
Low-Voltage Four-Channel LED Driver

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ZLED7012 数据手册

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ZLED7012  
Low-Voltage Four-Channel  
LED Driver  
Datasheet  
Brief Description  
Benefits  
The ZLED7012, one of our ZLED family of LED control  
ICs, is a low-noise, constant-frequency charge pump  
DC/DC converter that can drive up to four LED  
channels, providing a programmable constant current  
level ranging from 1.8mA to 20mA per LED channel. It  
can also drive higher current LEDs because its current  
sinks can operate in parallel. It enables white or other  
color LED applications that require uniform intensity  
and/or linear progressions in brightness. Capable of  
operating efficiently with DC voltage supplies ranging  
from 2.8V to 5.5V, it is ideal for small, battery-powered  
applications because very few external components are  
needed: typically one small-dimension 1μF capacitor  
across the C+ and C- pins and two small-dimension  
2.2μF capacitors to GND from the VCC and Vout pins.  
• Current matching accuracy: ±0.9% (typical)  
• One-pin on/off or brightness control for up to four  
LEDs via a simple PCC serial interface—no pulse-  
width modulation or additional control circuit needed  
• 14 programmable current levels for achieving real-  
time control of effects such as LED fade-out or  
sudden changes in brightness  
• Low EMI and back-injected noise because the  
charge pump is not inductor-based  
• Very few external components needed for operation  
• Flexible design enables diverse LED applications: up  
to 20mA per channel  
• LED driver family concept with low-voltage  
six-channel LED driver ZLED7022  
The ZLED7012’s Pulse Count Control (PCC) serial digi-  
tal input is used to enable/disable the LEDs and set the  
current level (14 settings using a nearly logarithmic  
scale to provide a linear brightness progression). This  
simple, high-speed interface allows efficient real-time  
management of LEDs via microcontrollers or control  
systems.  
Available Support  
•
Evaluation Kit  
The ZLED7012’s features include integrated soft-start  
circuitry to protect against excessive in-rush current dur-  
ing power-on and a low-current shutdown mode that  
reduces quiescent current consumption to approximately  
1μA (typical) by disconnecting the load from the input  
when the EN/SET pin is low for a specified time.  
Physical Characteristics  
• Voltage supply: 2.8V to 5.5V DC  
• Operating temperature: -40°C to 85°C  
• Small footprint 12-pin UTQFN package (2mm×2mm)  
Features  
• Low quiescent current in low-current shutdown  
mode: 1μA typical; <2μA maximum  
• Integrated thermal shutdown protection prevents  
damage by shutting down the ZLED7012 if the die  
junction temperature exceeds 160°C (typical)  
ZLED7012 Application Circuit  
• Fixed charge pump switching frequency: 1MHz (typ.)  
• Soft-start feature protects against excessive  
inrush current during power-on  
1μ  
F
Cpump  
C+  
C-  
2.8 V to 5.5V  
Vout  
VCC  
Cout  
Cin  
2.2μF  
2.2μ  
F
ZLED7012  
GND  
D0  
D1  
D2  
D3  
EN/SET  
1
2
n ≤ 14  
NC  
NC  
© 2016 Integrated Device Technology, Inc.  
1
April 20, 2016  
1234567...14

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