© Semiconductor Components Industries, LLC, 2010
March, 2010 − Rev. 5
1 Publication Order Number:
CAT3626/D
CAT3626
6-Channel LED Driver with
I
2
Ct Interface
Description
The CAT3626 is a high efficiency 1x/1.5x fractional charge pump
with programmable dimming current in six LED channels. To ensure
uniform brightness in LCD backlight applications, each LED channel
delivers an accurate regulated current.
Low noise and input ripple is achieved by operating at a constant
switching frequency of 1 MHz which allows the use of small external
ceramic capacitors. The 1x/1.5x fractional charge pump supports a
wide range of input voltages from 3 V to 5.5 V with efficiency up to
91%, and is ideal for Li−Ion battery powered devices.
The LED channels are configured into three independent pairs, each
containing 2 matched channels. Each pair can be separately
programmed from zero to 32 mA, in 0.5 mA resolution steps, using
the I
2
C serial interface. Any individual channel can be disabled while
others remain active. When the enable input (EN) is low, the device is
in shutdown mode drawing zero current.
The device is available in a 16−pad TQFN package with a max
height of 0.8 mm.
Features
• Drives 6 LED Channels
• Independent Current on 3 Pairs of LEDs
• I
2
C Serial Interface Programming
• Adjustable Current to 32 mA in 0.5 mA Step
• Power Efficiency up to 91%
• Fractional Pump 1x/1.5x
• Low Noise Input Ripple
• Fixed High Frequency Operation 1 MHz
• “Zero” Current Shutdown Mode
• Soft Start and Current Limiting
• Short Circuit Protection
• Thermal Shutdown Protection
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• RGB LEDs
• LCD and Keypad Backlighting
• Cellular Phones, PDAs
• Digital Cameras
http://onsemi.com
TQFN−16
HV4 SUFFIX
CASE 510AE
PIN CONNECTIONS
G626
AXXX
YMCC
MARKING DIAGRAMS
Device Package Shipping
ORDERING INFORMATION
CAT3626HV4−T2
(Note 1)
TQFN−16
(Pb−Free)
2,000/
Tape & Reel
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
LEDA2
LEDB1
LEDB2
LEDC1
LEDC2
GND
C2+
C2−
LEDA1
SDA
SCL
EN
VOUT
VIN
C1−
C1+
1
(4 x 4 mm) (Top View)
CDAJ
AXXX
YMCC
CAT3626HV4−GT2
(Note 2)
TQFN−16
(Pb−Free)
GND
G626 = CAT3626HV4−T2
CDAJ = CAT3626HV4−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
CC = Country of Origin (Two Digit)
