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High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
Typical Operating Characteristics (continued)
(See the Typical Applications Circuit , V V+ = V VP = 3.6V, I LED = 15mA, L1 = 22μH, C OUT1 = 0.1μF, C COMP = 0.022μF, R SENSE = 7.5 Ω ,
V CTRL = 1.5V, 4 LEDs, T A = +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
MAX1582 toc07
DIRECT-PWM DIMMING
MAX1582 toc08
V CTRL
500ns/div
V IN
10mV/div
V OUT
100mV/div
V LX
10V/div
32kHz
1V/div
0V
V IN
50mV/div
I IN
50mA/div
0mA
V OUT
5V/div
V IN = 3.8V Li+ BATTERY
0V
50 μ s/div
Pin Description
QFN
1
2
PIN
UCSP
A1
A2
NAME
V+
VP
FUNCTION
Input Voltage Supply. Input voltage range is 2.6V to 5.5V. Connect a 2.2μF capacitor from V+ to
PGND.
High-Current Input Supply. Connect to V+.
Brightness Control Input. LED brightness is controlled by the voltage applied to CTRL. Varying the
3
A3
CTRL
voltage from 0 to +1.62V adjusts the brightness from dim to bright, respectively. Any voltage
above +1.62V does not increase brightness.
4
5
6
7
8
A4
B4
C4
D4
D3
COMP
GND
EN1
EN2
CS
Compensation Input. Connect a 0.022μF capacitor (C COMP ) from COMP to GND. C COMP
stabilizes the converter and controls soft-start. C COMP discharges to GND when in shutdown.
Ground. Connect to PGND at a single point near the IC.
Enable 1 Input. Drive EN1 high to enable the main-display LEDs. Pull EN1 low to turn off the main-
display LEDs. Pull both EN1 and EN2 low to place the IC in low-current shutdown mode.
Enable 2. Drive EN2 high to enable the subdisplay LEDs. Pull EN2 low to turn off the subdisplay
LEDs. Pull both EN1 and EN2 low to place the IC in low-current shutdown mode.
Current-Sense Feedback Input. Connect a resistor (R SENSE ) from CS to GND to set the LED bias
current. The voltage at CS regulates to V CTRL / 10 or +0.162V, whichever is lower.
Display Switch Output. OUT2 is internally connected to CS when only the main display is lit. OUT2
9
D2
OUT2
is internally connected to OUT1 when only the subdisplay is lit. OUT2 is high impedance when
both displays are lit and when the IC is shut down.
Overvoltage Sense. When V OUT1 is greater than 27V (18V on the MAX1582Y), the internal
10
D1
OUT1
n-channel MOSFET turns off until V OUT1 drops below 25V (16.7V on the MAX1582Y), then the IC
re-enters soft-start. Connect a 0.1μF capacitor from OUT1 to PGND.
11
12
EP
C1
B1
—
LX
PGND
EP
Inductor Connection. During shutdown, this pin is high impedance.
Power Ground. Connect to GND at a single point near the IC.
Exposed Paddle. Connect directly to GND and PGND under the IC.
_______________________________________________________________________________________
5
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