MAX1582ETC-T Maxim Integrated Products, MAX1582ETC-T Datasheet - Page 5

• Manufacturer Part Number: MAX1582ETC-T
• Description: LED Drivers High Efficiency 26V Step-Up Converter fo
• Manufacturer: Maxim Integrated Products

Specifications of MAX1582ETC-T

• Number Of Segments: 6
• Operating Supply Voltage: 2.6 V to 5.5 V
• Maximum Power Dissipation: 1349 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN EP
• Minimum Operating Temperature: - 40 C

(See the Typical Applications Circuit, V
V
CTRL
QFN
10
11
12
EP
1
2
3
4
5
6
7
8
9
for White LED Main and Subdisplay Backlighting
= 1.5V, 4 LEDs, T
PIN
UCSP
A1
A2
A3
A4
B4
C4
D4
D3
D2
D1
C1
B1
—
_______________________________________________________________________________________
SWITCHING WAVEFORMS
NAME
COMP
PGND
A
OUT2
OUT1
CTRL
GND
EN1
EN2
CS
V+
VP
LX
EP
= +25°C, unless otherwise noted.)
500ns/div
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
voltage from 0 to +1.62V adjusts the brightness from dim to bright, respectively. Any voltage
above +1.62V does not increase brightness.
Compensation Input. Connect a 0.022µF capacitor (C
stabilizes the converter and controls soft-start. C
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
current. The voltage at CS regulates to V
Display Switch Output. OUT2 is internally connected to CS when only the main display is lit. 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
n-channel MOSFET turns off until V
re-enters soft-start. Connect a 0.1µF capacitor from OUT1 to PGND.
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.
V+
High-Efficiency Step-Up Converters
= V
MAX1582 toc07
VP
= 3.6V, I
Typical Operating Characteristics (continued)
V
10mV/div
V
100mV/div
V
10V/div
IN
OUT
LX
LED
= 15mA, L1 = 22µH, C
OUT1
is greater than 27V (18V on the MAX1582Y), the internal
OUT1
CTRL
drops below 25V (16.7V on the MAX1582Y), then the IC
FUNCTION
/ 10 or +0.162V, whichever is lower.
COMP
OUT1
DIRECT-PWM DIMMING
SENSE
COMP
discharges to GND when in shutdown.
= 0.1µF, C
) from COMP to GND. C
) from CS to GND to set the LED bias
50μs/div
V
IN = 3.8V Li+ BATTERY
COMP
Pin Description
= 0.022µF, R
MAX1582 toc08
V
32kHz
1V/div
0V
V
50mV/div
I
50mA/div
0mA
V
5V/div
0V
IN
CTRL
IN
OUT
COMP
SENSE
= 7.5Ω,
5