MAX1698EUB Maxim Integrated Products, MAX1698EUB Datasheet - Page 4

• Manufacturer Part Number: MAX1698EUB
• Description: IC LED DRVR WT/CLR BCKLGT 10MSOP
• Manufacturer: Maxim Integrated Products
• Type: Backlight, White LED, Color LEDr

Specifications of MAX1698EUB

• Topology: Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Backlight
• Type - Secondary: White LED
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Operating Temperature: -40°C ~ 85°C
• Internal Switch(s): Yes
• Efficiency: 90%
• Low Level Output Current: 200 mA
• High Level Output Current: 200 mA
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Power Dissipation: 444 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Frequency: -
• Current - Output / Channel: -

High-Efficiency Step-Up
Current Regulator for LEDs
(Circuit of Figure 2, V
4
1000
900
800
700
600
500
400
300
200
100
100
25
20
15
10
90
80
70
60
50
40
30
20
10
0
5
0
0
_______________________________________________________________________________________
0
0
5
OUTPUT CURRENT vs. V
EFFICIENCY vs. OUTPUT CURRENT
1
1
15
vs. V
2
2
vs. BATTERY VOLTAGE
I
OUT
25
BATT
BATTERY CURRENT
I
BATT
OUTPUT CURRENT (mA)
3
3
vs. V
35
V
4
BATT
4
V
CC
BATT
45
CC
, V
5
5
CC
(V)
4 CHAINS OF 4 LEDs
1 CHAIN OF 4 LEDs
V
4 CHAINS OF 4 LEDs
55
= V
6
BATT
6
(V)
BATT
BATT
= 5V
7
65
7
AND V
8
8
75
= 3.3V, V
9
9
85
CC
10
10
ADJ
3.3V
100
1.2
1.0
0.8
0.6
0.4
0.2
= V
90
80
70
60
50
40
30
20
10
0
0
0
100
0
REF
SHUTDOWN/SOFT-START TIMING
NORMALIZED OUTPUT CURRENT
I
, T
400
OUT
0.2
EXT RISE/FALL TIME vs. C
A
SET TO 80mA,
= +25°C, unless otherwise noted.)
700 1000 1300 1600 1900 2200
0.4
vs. ADJ VOLTAGE
ADJ VOLTAGE (V)
0.6
RISE TIME
C
5ms/div
EXT
FALL TIME
(pF)
4 CHAINS OF 4 LEDs
0.8
Typical Operating Characteristics
1.0
EXT
1.2
MXA1698-08
1.4
I
50mA/div
I
100mA/div
SHDN
5V/div
OUT
BATT
22.0
21.5
21.0
20.5
20.0
100
90
80
70
60
50
40
30
20
10
0
0
0
EFFICIENCY vs. BATTERY VOLTAGE
2
LED AND INDUCTOR CURRENT
2
4
vs. INPUT VOLTAGE
OUTPUT CURRENT
BATTERY VOLTAGE (V)
6
INPUT VOLTAGE (V)
WAVEFORMS
8
4
1µs/div
10
I
4 CHAINS OF 4 LEDs
1 CHAIN OF 4 LEDs
OUT
12 14 16 18 20
6
= 80mA
8
MXA1698-09
10
LED
CURRENT
50mA/div
INDUCTOR
CURRENT
500mA/div