MAX1848ETA-T Maxim Integrated Products, MAX1848ETA-T Datasheet - Page 4

• Manufacturer Part Number: MAX1848ETA-T
• Description: LED Drivers High-Efficiency Unif orm-Brightness White
• Manufacturer: Maxim Integrated Products

Specifications of MAX1848ETA-T

• Number Of Segments: 3
• Operating Supply Voltage: 2.6 V to 5.5 V
• Maximum Power Dissipation: 1951 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TDFN EP
• Minimum Operating Temperature: - 40 C

White LED Step-Up Converter in SOT23
(See Typical Application Circuit, V+ = 3V, I
T
4
V
A
V
V
COMP
V
CTRL
CTRL
90
88
86
84
82
80
I
LED
OUT
= +25°C, unless otherwise noted.)
I
IN
_______________________________________________________________________________________
2.5
2 LEDs
EFFICIENCY vs. SUPPLY VOLTAGE
t
RISE
3.0
SHUTDOWN WAVEFORMS
POWER-UP WAVEFORMS
= 15ms
3 LEDs
SUPPLY VOLTAGE (V)
3.5
50ms/div
2μs/div
4.0
V
DECAYS TO V+ = 3V
OUT
C
4.5
COMP
I
EVENTUALLY
OUT
= 0.15μF
= 15mA
MAX1848 toc07
5.0
MAX1848 toc04
5.5
1V
0
6.3V
4.9V
1.5V
0
1V
0
38mA
0
15mA
0
LED
= 15mA, L = 33µH, C
V
V
CTRL
I
90
85
80
75
70
I
LED
OUT
LED
V
I
IN
IN
0
C
COMP
t
EFFICIENCY vs. LOAD CURRENT
RISE
10
2 LEDs
LINE-TRANSIENT RESPONSE
POWER-UP WAVEFORMS
= 110ms
= 0.15μF
LOAD CURRENT (mA)
20
50ms/div
3 LEDs
5ms/div
30
OUT
Typical Operating Characteristics
C
= 1µF, C
COMP
40
= 1μF
MAX1848 toc05
MAX1848 toc08
50
COMP
60
1V
0
38mA
0
15mA
0
3.50V
3.00V
6.25V
500mV/div
15mA
10mA/div
= 0.15µF, R
V
V
1.4
1.3
1.2
1.1
V
CTRL
CTRL
I
I
OUT
LED
LED
I
IN
2.5
SENSE
V
3.0
CTRL
SHUTDOWN WAVEFORMS
SWITCHING FREQUENCY
vs. SUPPLY VOLTAGE
= 5Ω, CTRL = 1V, 2 LEDs,
SUPPLY VOLTAGE (V)
TRANSIENT RESPONSE
3.5
T
20μs/div
20ms/div
A
= +85°C
4.0
T
A
C
= -40°C
4.5
COMP
T
A
= 0.15μF
= +25°C
MAX1848 toc06
MAX1848 toc09
5.0
5.5
1V
0
38mA
0
15mA
0
2.0V
1.0V
6.7V
6.3V
30mA
15mA