MAX1698(2000) 查看數據表（PDF） - Maxim Integrated
零件编号
产品描述 (功能)
生产厂家
MAX1698 Datasheet PDF : 8 Pages
| |||
High-Efficiency Step-Up
Current Regulator for LEDs
Typical Operating Characteristics
(Circuit of Figure 2, VCC = VBATT = 3.3V, VADJ = VREF, TA = +25°C, unless otherwise noted.)
OUTPUT CURRENT vs. VBATT AND VCC
25
vs. VBATT
20
vs. VCC
15
10
5
1 CHAIN OF 4 LEDs
0
0 1 2 3 4 5 6 7 8 9 10
VBATT, VCC (V)
BATTERY CURRENT
vs. BATTERY VOLTAGE
1000
900
4 CHAINS OF 4 LEDs
800
700
IBATT
600
500
400
300
200
100
IOUT
0
0 1 2 3 4 5 6 7 8 9 10
VBATT (V)
EFFICIENCY vs. OUTPUT CURRENT
100
90
80
70
60
50
40
30
20
10
0
5
VBATT = 5V
4 CHAINS OF 4 LEDs
15 25 35 45 55 65 75 85
OUTPUT CURRENT (mA)
NORMALIZED OUTPUT CURRENT
vs. ADJ VOLTAGE
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
ADJ VOLTAGE (V)
OUTPUT CURRENT
vs. INPUT VOLTAGE
22.0
21.5
21.0
20.5
1 CHAIN OF 4 LEDs
20.0
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
100
90
80
70
60
50
40
30
20
10
0
100
EXT RISE/FALL TIME vs. CEXT
RISE TIME
FALL TIME
400 700 1000 1300 1600 1900 2200
CEXT (pF)
SHUTDOWN/SOFT-START TIMING
MXA1698-08
EFFICIENCY vs. BATTERY VOLTAGE
100
90
80
70
60
50
40
30
20
10
0
0
IOUT = 80mA
4 CHAINS OF 4 LEDs
2
4
6
8
10
BATTERY VOLTAGE (V)
LED AND INDUCTOR CURRENT
WAVEFORMS
MXA1698-09
IOUT
50mA/div
LED
CURRENT
50mA/div
IBATT
100mA/div
3.3V
0
SHDN
IOUT SET TO 80mA, 4 CHAINS OF 4 LEDs 5V/div
5ms/div
1µs/div
INDUCTOR
CURRENT
500mA/div
4 _______________________________________________________________________________________
Share Link: 