CAT3636HV3-T2 ON Semiconductor, CAT3636HV3-T2 Datasheet - Page 12

• Manufacturer Part Number: CAT3636HV3-T2
• Description: IC LED DRVR WHITE BCKLGT 16-TQFN
• Manufacturer: ON Semiconductor
• Series: QUAD-Mode®r
• Type: Backlight, White LEDr

Specifications of CAT3636HV3-T2

• Topology: Switched Capacitor (Charge Pump)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: RGB, White LED
• Frequency: 600kHz ~ 1.4MHz
• Voltage - Supply: 2.5 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: 92%
• Number Of Segments: 6
• Operating Supply Voltage: 2.5 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: Details
• Other names: 3636HV3-T2; CAT3636HV3-T2TR

Unused LED Channels
banks can be disabled via the enable register internally and
left to float.
also be disabled by connecting the LED pin directly to
VOUT, as shown on Figure 22. If LED pin voltage is within
1 V of VOUT, then the channel is switched off and a 200 mA
test current is placed in the channel to sense when the
channel moves below VOUT – 1 V.
Protection Mode
automatically limits at about 5.5 V. This is to prevent the
output pin from exceeding its absolute maximum rating.
enter a thermal protection shutdown mode. When the device
temperature drops by about 20°C the device will resume
normal operation.
For applications with only four or two LEDs, unused LED
For applications with 5 LEDs or less, unused LEDs can
If an LED is disconnected, the output voltage V
If the die temperature exceeds +150°C the driver will
Figure 22. Five LED Application
Figure 23. Recommended Layout
http://onsemi.com
OUT
12
LED Selection
5.0 V may be used with the CAT3636. Selecting LEDs with
lower V
by keeping the driver in 1x mode longer as the battery
voltage decreases.
over one with V
for lower supply voltage of 0.2 V. This helps improve the
efficiency and extends battery life.
External Components
for decoupling input, output, and for the charge pump. Both
capacitors type X5R and X7R are recommended for the
LED driver application. In all charge pump modes, the input
current ripple is kept very low by design and an input bypass
capacitor of 1 mF is sufficient.
not introduce switching noise back onto the supply.
Recommended Layout
high frequency. It is recommended to minimize trace length
to all four capacitors. A ground plane should cover the area
under the driver IC as well as the bypass capacitors. Short
connection to ground on capacitors C
implemented with the use of multiple via. A copper area
matching the TQFN exposed pad (TAB) must be connected
to the ground plane underneath. The use of multiple via
improves the package heat dissipation.
LEDs with forward voltages (V
For example, if a white LED with a V
The driver requires two external 1 mF ceramic capacitors
In 1x mode, the device operates in linear mode and does
In charge pump mode, the driver switches internally at a
F
is recommended in order to improve the efficiency
F
of 3.5 V, the CAT3636 will stay in 1x mode
F
) ranging from 1.3 V to
IN
F
of 3.3 V is selected
and C
OUT
can be