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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
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TQFN−16
HV4 SUFFIX
CASE 510AE
PIN CONNECTIONS
LEDC1
LEDA2
1
GND
LEDB1
LEDB2
LEDA1
SDA
SCL
EN
LEDC2
GND
C2+
C2−
•
•
•
•
•
•
•
•
•
•
•
•
•
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
RGB LEDs
LCD and Keypad Backlighting
Cellular Phones, PDAs
Digital Cameras
C1−
VOUT
(4 x 4 mm) (Top View)
MARKING DIAGRAMS
G626
AXXX
YMCC
CDAJ
AXXX
YMCC
Applications
•
•
•
•
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)
ORDERING INFORMATION
Device
CAT3626HV4−T2
(Note 1)
CAT3626HV4−GT2
(Note 2)
Package
TQFN−16
(Pb−Free)
TQFN−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
©
Semiconductor Components Industries, LLC, 2010
March, 2010
−
Rev. 5
1
Publication Order Number:
CAT3626/D
C1+
VIN
CAT3626
1
mF
1
mF
pair A
pair B
pair C
C
OUT
1
mF
20 mA
V
IN
3 V to
5.5 V
C
IN
1
mF
ENABLE
I
2
C
Interface
C1− C1+ C2− C2+
VIN
VOUT
CAT3626
LEDA1
LEDA2
LEDB1
EN
LEDB2
SDA
LEDC1
SCL
LEDC2
GND
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
VIN, LEDxx voltage
VOUT, C1±, C2± voltage
EN, SDA, SCL voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Ratings
6
7
VIN + 0.7 V
−65
to +160
−40
to +150
300
Units
V
V
V
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Ambient Temperature Range
LED forward voltage
I
LED
per LED pin
NOTE:
Typical application circuit with external components is shown above.
Range
3 to 5.5
−40
to +85
Up to 4.2
0 to 32
Units
V
°C
V
mA
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2
CAT3626
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
Symbol
I
Q
Parameter
Quiescent Current
V
IN
= 3.6 V, EN = High, ambient temperature of 25°C (over recommended operating conditions unless specified otherwise)
Test Conditions
1x mode, all LEDs Off
1x mode, all LEDs On
1.5x mode, all LEDs Off
V
EN
= 0 V
0
1 mA
v
I
LED
v
31 mA
(I
LED
−
I
LEDAVG
) / I
LEDAVG
1x mode, I
OUT
= 120 mA
1.5x mode, I
OUT
= 120 mA
0.8
V
OUT
< 0.5 V
1x mode, V
OUT
> 1 V
−1
1.3
±3
±3
0.5
2.8
1
60
300
1
0.4
1.3
Min
Typ
0.5
2.2
3.5
0
1
32
Max
Units
mA
I
QSHDN
I
LED
I
LED−ACC
I
LED−DEV
R
OUT
F
OSC
I
SC_MAX
I
IN_MAX
I
EN
Shutdown Current
LED Current Range with 6 LEDs
LED Current Accuracy
LED Channel Matching
Output Resistance (open loop)
Charge Pump Frequency
Output short circuit Current Limit
Input Current Limit
EN Pin
−
Input Leakage
−
Logic High Level
−
Logic Low Level
I
2
C SDA, SCL
−
High Level Input Voltage
−
Low Level Input Voltage
Thermal Shutdown
Thermal Hysteresis
Under−voltage lock out (UVLO) threshold
mA
mA
%
%
W
MHz
mA
mA
mA
V
V
V
V
°C
°C
V
V
HI−EN
V
LO−EN
V
HI
V
LO
T
SD
T
HYS
V
UVLO
0.7 x V
IN
165
20
2
0.3 x V
IN
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3
CAT3626
Table 4. A.C. CHARACTERISTICS
For 3 V
≤
V
IN
≤
5.5 V, over full ambient temperature range
−40°C
to +125°C
(over recommended operating conditions unless specified otherwise).
Symbol
f
SCL
t
AA
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
SU:DAT
t
R
t
F
t
SU:STO
t
DH
Clock Frequency
SCL Low to SDA Data Out and ACK Out
Bus Free Time Before a New Transmission Can Start
Start Condition Hold Time
Clock Low Period
Clock High Period
Start Condition Setup Time (For a Repeated Condition)
Data In Hold Time
Data In Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Condition Setup Time
Data Out Hold Time
t
F
t
HIGH
t
R
0.6
50
1.2
0.6
1.2
0.6
0.6
0
100
0.3
300
Parameter
Min
Typ
Max
400
0.9
Unit
kHz
ms
ms
ms
ms
ms
ms
ns
ns
ms
ns
ms
ns
t
LOW
t
LOW
SCL
t
SU:STA
t
HD:SDA
t
SU:DAT
t
SU:STO
SDA IN
t
AA
t
HD:DAT
t
DH
t
BUF
SDA OUT
Figure 2. I
2
C Bus Timing Characteristics
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4
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