CAT4201TD-GT3 ON Semiconductor, CAT4201TD-GT3 Datasheet - Page 11

• Manufacturer Part Number: CAT4201TD-GT3
• Description: IC LED DRIVER HIGH BRIGHT TSOT-5
• Manufacturer: ON Semiconductor
• Type: HBLED Driverr

Specifications of CAT4201TD-GT3

• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: High Brightness LED (HBLED)
• Frequency: 1MHz
• Voltage - Supply: 6.5 V ~ 36 V
• Voltage - Output: 36V
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 350mA
• Internal Switch(s): Yes
• Efficiency: 94%
• Number Of Segments: 1
• Operating Supply Voltage: 6.5 V to 28 V
• Maximum Supply Current: 0.4 mA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: CAT4201TD-GT3TR

Open LED Behavior
switching and draws very little current.
charged−up by the CAT4201. As soon as the bottom side of
the capacitor (C2−) reaches 0 volt, as shown on Figure 31,
the CAT4201 stops switching and remains in the idle mode
only drawing about 0.4 mA current from the supply.
VIN
If the LEDs are not connected, the CAT4201 stops
At power−up with no load connected, the capacitor C2 is
1 W
Figure 30. Three CAT4201 in Parallel for 1 A LED
R5
8.3 kΩ
4.7 μF
4.7 μF
4.7 μF
R2
R1
R3
C3
C2
C1
8.3 kΩ
8.3 kΩ
VBAT
RSET
CTRL
VBAT
VBAT
RSET
CTRL
RSET
CTRL
CAT4201
CAT4201
CAT4201
GND
GND
GND
U2
U3
U1
SW
SW
SW
D1
D2
D3
22 μH
22 μH
22 μH
L1
L2
L3
10 μF
C4
http://onsemi.com
1 kΩ
R4
1 A
11
Board Layout
Schottky diode, the inductor and the output capacitor C2
should all be located close to the driver IC. The input
capacitor C1 should be located close to the VBAT pin and the
Schottky diode cathode. The CAT4201 ground pin should be
connected directly to the ground plane on the PCB. A
recommended PCB layout with component location is
shown on Figure 32. The LEDs are connected by two wires
tied to both sides of the output capacitor C2. The LEDs can
be located away from the driver if needed.
optional Pi style filter (C−L−C) can be used. A 10 mH
inductor rated to the maximum supply current can be used.
In order to minimize EMI and switching noise, the
In order to further reduce the ripple on the supply rail, an
Figure 32. Recommended PCB Layout
Figure 31. Open LED Mode