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White LED Step-Up Converter in SOT23
Typical Operating Characteristics (continued)
(See Typical Application Circuit , V+ = 3V, I LED = 15mA, L = 33μH, C OUT = 1μF, C COMP = 0.15μF, R SENSE = 5 Ω , CTRL = 1V, 2 LEDs,
T A = +25 ° C, unless otherwise noted.)
V CTRL TRANSIENT RESPONSE
MAX1848 toc10
SWITCHING WAVEFORMS
MAX1848 toc11
V CTRL
2.0V
V LX
6.5V
0
1.0V
6.7V
I L
61mA
17mA
V OUT
6.3V
I LED
30mA
V IN_RIPPLE
10mV/div
C COMP = 1 μ F
20ms/div
15mA
V OUT_RIPPLE
200ns/div
10mV/div
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
COMP
CTRL
OUT
LX
PGND
GND
CS
V+
FUNCTION
Compensation Pin for Error Amplifier. Connect capacitor from COMP to GND. Startup time is set
by the capacitance connected to this pin (0.833ms for each 0.01μF). V COMP passively
discharges to GND when in shutdown.
Brightness/Shutdown Dual Mode Control Input. LED brightness and IC shutdown are controlled
by the voltage on CTRL. Voltages between 250mV and 5.5V or (V+ + 2V), whichever is less,
adjust the brightness from dim to bright, respectively. To put the IC into shutdown, drive below
100mV or connect to GND.
Overvoltage Sense. When V OUT is greater than 13.25V, the internal N-channel MOSFET is turned
off and V COMP decays to GND. When V OUT drops below 12.25V, the IC will re-enter soft-start.
Connect a 1μF capacitor from OUT to GND.
Inductor Connection. Drain of the internal high-voltage N-channel MOSFET.
Power Ground. Source of the internal high-voltage N-channel MOSFET.
Ground
Current-Sense Feedback Input. Connect a resistor from this pin to GND to set the LED bias
current. This pin regulates to 7.5% of V CTRL .
Supply Voltage Input. The IC is powered from this pin. Input range is 2.6V to 5.5V. Bypass with a
ceramic capacitor to GND.
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