CAT3626HV4-T2 ON Semiconductor, CAT3626HV4-T2 Datasheet - Page 10

• Manufacturer Part Number: CAT3626HV4-T2
• Description: IC LED DRVR WT/RGB BCKLGT 16TQFN
• Manufacturer: ON Semiconductor
• Type: Backlight, White LED, RGB (I²C Interface)r

Specifications of CAT3626HV4-T2

• Topology: PWM, Switched Capacitor (Charge Pump)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: RGB, White LED
• Frequency: 800kHz ~ 1.3MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-TFQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 32mA
• Internal Switch(s): Yes
• Efficiency: 91%
• Number Of Segments: 6
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: CAT3626HV4-T2CT

Block Diagram
Basic Operation
where the output will be approximately equal to the input
supply voltage (less any internal voltage losses). If the
output voltage is sufficient to regulate all LEDs currents the
device remains in 1x operating mode.
the regulated currents cannot be maintained, the device
automatically switches (after a fixed time of 400 ms) into
1.5x mode.
times the input supply voltage (less any internal voltage
losses).
chip is either powered−up or taken out of shutdown (via
EN pin), or the RegEn register is accessed by write cycle.
3. X = not used, 1 = logic high, 0 = logic low
V
Table 6. REGISTER ADDRESS AND DATA CONFIGURATION
IN
At power−up, the CAT3626 starts operating in 1x mode
If the input voltage is insufficient or falls to a level where
In 1.5x mode, the output is approximately equal to 1.5
The above sequence is repeated each and every time the
Register
SDA
SCL
RegEn
Name
RegA
RegB
RegC
1 mF
C
EN
IN
Interface
Serial
Register
Address
0
1
2
3
C
Setting DAC
1−
Reference
Oscillator
Current
Voltage
1.5x Charge Pump
Registers
1 mF
1 MHz
Bit 7
1x mode (LDO)
Figure 25. CAT3626 Functional Block Diagram
X
X
X
X
C
1+
Bit 6
X
X
X
X
C
2−
Mode Control
1 mF
http://onsemi.com
C
LEDC2
On = 1
Off = 0
2+
Bit 5
10
GND
LED Current Setting
interface and is stored in four 8−bit registers RegA, RegB,
RegC and RegEn as follows:
•
•
•
•
reconfigures to the mode (1x or 1.5x) that provides the
highest efficiency.
(Note 3)
LEDC1
On = 1
Off = 0
The LED current setting is programmed via the I
At each write access to RegEn, the driver automatically
RegA stores the LED current for group A (LEDA1 and
LEDA2 channels),
RegB stores the LED current for group B (LEDB1 and
LEDB2 channels),
RegC stores the LED current for group C (LEDC1 and
LEDC2 channels),
RegEn selects the on/off state of each of the 6 LED
channels.
Bit 4
Bit Pattern
See Table 7 for values
LEDB2
On = 1
Off = 0
6 Current
Sink Regulators
V
Bit 3
LEDA1
LEDA2
LEDB1
LEDB2
LEDC1
LEDC2
OUT
LEDB1
On = 1
Off = 0
Bit 2
LEDA2
On = 1
Off = 0
Bit 1
LEDA1
On = 1
Off = 0
2
Bit 0
C
C serial
1 mF
OUT