CAT3612HV2-GT2 ON Semiconductor, CAT3612HV2-GT2 Datasheet - Page 10

• Manufacturer Part Number: CAT3612HV2-GT2
• Description: IC LED DVR CHRGE PUMP 2CH 12TDFN
• Manufacturer: ON Semiconductor
• Type: Photo Flash LEDr

Specifications of CAT3612HV2-GT2

• Topology: Linear (LDO), Switched Capacitor (Charge Pump)
• Number Of Outputs: 2
• Internal Driver: Yes
• Type - Primary: Flash/Torch
• Frequency: 800kHz ~ 1.3MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 7V
• Mounting Type: Surface Mount
• Package / Case: 12-VFDFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 150mA
• Internal Switch(s): Yes
• Efficiency: 90%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LED Current Setting
setting the LED currents. The EN/DIM set−up time requires
the signal to be held high for 10 ms or longer to ensure the
initialization of the driver at power−up. Each subsequent
pulse on the EN/DIM (300 ns to 200 ms pulse duration) steps
down the LED current from full scale of 150 mA to zero with
nearly 5 mA resolution. The selection of the LED current per
channel is shown in Table 6. Consecutive pulses should be
separated by 300 ns or longer. Pulsing beyond the 0 mA level
restores the current level back to full scale and the cycle
repeats. Pulsing frequencies from 5 kHz up to 1 MHz can be
supported during dimming operations. When the EN/DIM
is held low for 1.5 ms or more, the CAT3612 enters the
shutdown mode and draws “zero” current.
LED pin, refer to Figure 28.
3 V to
5.5 V
Figure 2 shows the EN/DIM input timing diagram for
For applications with 2 LEDs, each LED connected to one
ENABLE/
DIMMING
V
IN
2.2 mF
Figure 28. Application with 2 LEDs
C
IN
VIN
EN/DIM
C1+
1 mF
CAT3612
C1−
GND
C2+
1 mF
VOUT
LED2
LED1
C2−
2.2 mF
C
OUT
150 mA
http://onsemi.com
Flash
LED
10
Table 6. SELECTION OF LED CURRENT
PER CHANNEL
Number of Pulses on EN/DIM
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
2
3
4
5
6
7
8
9
LED Current (mA)
135.5
106.5
101.5
77.5
72.5
48.5
43.5
14.5
150
145
140
131
126
121
116
111
97
92
87
82
68
63
58
53
39
34
29
24
19
10
5
0