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1.5x/2x High-Efficiency White LED
Charge Pumps
Applications Information
The total LED current is determined by:
0 . 2 ( V LOGIC - 0 . 2 ) × R B
× R
Adjusting LED Intensity
Figure 8 shows a circuit using a DAC to set the LED
intensity. Maximum intensity occurs when the output of
I L =
R L R L A
-
the DAC is zero. R L can be initially estimated from the
maximum load current:
R L ≈ 0.2/I L(MAX)
Use this as a starting point to calculate R A and R B from
the formula below. The total LED current, I L , at different
DAC output voltages is determined by:
PC Board Layout
The MAX1910/MAX1912 are high-frequency switched-
capacitor voltage regulators. For best circuit perfor-
mance, use a ground plane and keep C IN , C OUT , C1,
C2, and feedback resistors (if used) close to the
device. If using external feedback, keep the feedback
0 . 2 ( V DAC - 0 . 2 ) × R B
× R
I L =
R L R L A
-
node as small as possible by positioning the feedback
resistors very close to SET.
Figure 9 uses a digital input for two-level dimming control.
The LEDs are brightest when a logic-low input (V LOGIC =
0) is applied, and dimmed with a logic-high input.
IN
Chip Information
TRANSISTOR COUNT: 2497
PROCESS: BiCMOS
SW1
SW7
SW5
SW4
SW2
GND
(REGULATING
SWITCH)
SW6
SW3
OUT
C1-
C1+
C2-
C2+
MODE
1.5x
1.5x
2x
2x
PHASE
Charging
Transfer
Charging
Transfer
SW1
OFF
ON
OFF
ON
SW2
ON
OFF
OFF
OFF
SW3
OFF
ON
ON
ON
SW4
OFF
ON
ON
ON
SW5
ON
OFF
ON
OFF
SW6
OFF
ON
OFF
ON
SW7
ON
OFF
ON
OFF
Figure 1. Functional Charge-Pump Switch Diagram (Switches Shown for 1.5x Charging Phase)
6
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