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High-Efficiency, 26V Step-Up Converters
for Two to Six White LEDs
INPUT
2.6V TO 5.5V
2.2 μ F
L1
IN
LX
C OUT
PWM CONTROL
PGND
0.1 μ F
f OSC
SLOPE COMP
OVERVOLTAGE
OUT
UP TO 26V
CURRENT SENSE
PROTECTION
MAX1561
2 TO 6 LEDS
PWM OR
ANALOG
CTRL
450k ?
MAX1599
DIMING
50k ?
g m
COMP
C COMP
0.1 μ F
CS
170mV
Figure 1. Functional Diagram
SHUTDOWN TIMER
GND
SHUTDOWN
R SENSE
7.5 ?
V CTRL
Design Procedure
Adjusting LED Current
Adjusting the MAX1561/MAX1599s ’ output current
changes the brightness of the LEDs. An analog input
(CTRL) and the sense-resistor value set the output cur-
rent. Output current is given by:
I LED =
10 × R SENSE
The V CTRL voltage range for adjusting output current is
0.24V to 1.62V. To set the maximum current, calculate
R SENSE when V CTRL is at its maximum as follows:
Power dissipation in R SENSE is typically less than 5mW,
making a standard chip resistor sufficient.
PWM Dimming Control
CTRL is also used as a digital input allowing LED bright-
ness control with a logic-level PWM signal applied direct-
ly to CTRL. The frequency range is from 200Hz to
200kHz, while 0% duty cycle corresponds to zero cur-
rent and 100% duty cycle corresponds to full current.
The error amplifier and compensation capacitor form a
lowpass filter so PWM dimming results in DC current to
the LEDs without the need for any additional RC filters;
see the Typical Operating Characteristics .
Capacitor Selection
R SENSE =
1 . 62 V
10 × I LED ( MAX )
The exact values of input and output capacitors are not
critical. The typical value for the input capacitor is
2.2μF and the typical value for the output capacitor is
0.1μF. Larger value capacitors can be used to reduce
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