LTC3216 Datasheet, PDF (10/12 Pages) Linear Technology – 1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control

LTC3216
TYPICAL APPLICATIO S
Similarly, in 2x boost mode, the efficiency is similar to that
of a linear regulator with an effective input voltage of 2
times the actual input voltage. In an ideal 2x charge pump,
the power efficiency would be given by:
η_IDEAL
≡
P_LED
P_IN
=
V_LED •I_LED
V_IN • 2 •I_LED
≈
V_LED
2 • V_IN
(7)
Thermal Management
For higher input voltages and maximum output current,
there can be substantial power dissipation in the LTC3216.
If the junction temperature increases above approximately
150°C, the thermal shutdown circuitry will automatically
deactivate the output. To reduce maximum junction tem-
perature, a good thermal connection to the PC board is
recommended. Connecting the Exposed Pad to a ground
plane and maintaining a solid ground plane under the
device can reduce the thermal resistance of the package
and PC board considerably.
3216fa
10