ZLED7022 Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – Low-Voltage Six-Channel LED Driver

Low-Voltage Six-Channel
LED Driver
ZLED7022
Datasheet
Brief Description
The ZLED7022, 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 six 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 effi-
ciently 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 capaci-
tors to GND from the VCC and Vout pins.
The ZLED7022’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 ZLED7022’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.
Benefits
• Current matching accuracy: ±0.9% (typical)
• One-pin on/off or brightness control for up to six
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
four-channel LED driver ZLED7012
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)
Features
• Low quiescent current in low-current shutdown
mode: 1μA typical; <2μA maximum
• Integrated thermal shutdown protection prevents
damage by shutting down the ZLED7022 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
ZLED7022 Application Circuit
1μF
Cpump
C+
C-
2..8V to 5.5V
VCC
Vout
Cin 2.2μF
ZLED7022
GND
D0
D1
EN/SET
D2
1
2
n<=14
D3
D4
D5
Cout 2.2μF
© 2016 Integrated Device Technology, Inc.
1
April 20, 2016