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LDS8620
5. Input Voltage Under-Voltage Lockout
If V IN falls below 2.1 V (typical value), LDS8620
enters shutdown mode. Device requires restart when
input voltage rises above 2.2 V.
6. Low V IN or High LED V F Voltage Detection
If, in 2-x mode, V IN is too low to maintain regulated
LED current for given LED V F , or LED becomes an
open circuit, or if any LED at active channels is
disconnected, LDS8620 starts subsequently
changing modes (2-x – 1-x – 1.5-x – 2-x - …) in an
attempt to compensate insufficient voltage. As a
result, average current at all other channels that are
ON may be below regulated level.
LED Selection
LEDs with forward voltages (V F ) ranging from 1.6 V to
4.5 V may be used. Charge pumps operate in the
highest efficiency mode when V F voltage is close to
Vin voltage multiplied by switching mode, i.e. Vin x 1,
Vin x 1.5 and so on. If the voltage source is a Li-ion
battery, we recommend selecting LED with V F = 2.7 –
3.6 V to extend the battery life and achieve highest
efficiency.
External Components
The LDS8620 requires two external 1 μF ceramic
capacitors (X5R or X7R type) for decoupling input,
output, and two 0.22 μF capacitors (X5R or X7R
Recommended Layout
In charge pump mode, the driver switches internally
at a 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 Cin and Cout can be implemented with the
use of multiple via. A copper area matching the
TQFN exposed pad (PAD) must be connected to the
ground plane underneath. The use of multiple via
improves the package heat dissipation.
type)
for the charge pump. In all charge pump
modes, the input current ripple is very low, and an
input bypass capacitor of 1 μF is sufficient.
In 1-x mode, the device operates in linear mode and
does not introduce switching noise back onto the
supply.
Figure 3. Recommended layout
? 2009 IXYS Corp.
Characteristics subject to change without notice
9
Doc. No. 8620DS, Rev. N1.1
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