ZLED7012 Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – Low-Voltage Four-Channel LED Driver

Low-Voltage Four-Channel
LED Driver
ZLED7012
Datasheet
Brief Description
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.
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.
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.
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)
• Fixed charge pump switching frequency: 1MHz (typ.)
• Soft-start feature protects against excessive
inrush current during power-on
Benefits
• 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
Available Support
• Evaluation Kit
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)
ZLED7012 Application Circuit
1μF
Cpump
C+
C-
2.8 V to 5.5V
VCC
Vout
Cin 2.2μF
ZLED7012
Cout 2.2μF
GND
D0
D1
EN/SET
D2
1
2
n ≤ 14
D3
NC
NC
© 2016 Integrated Device Technology, Inc.
1
April 20, 2016