MAX6948B MAXIM [Maxim Integrated Products], MAX6948B Datasheet - Page 6

• Manufacturer Part Number: MAX6948B
• Description: High-Efficiency PWM LED Driver with Boost Converter and Five Constant-Current GPIO Ports
• Manufacturer: MAXIM [Maxim Integrated Products]

500mV/div
(V+ = 3.3V, V
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
6
5V/div
V
OUT
V+
35
25
15
90
85
80
75
70
65
60
5
2.70
2.70
I
WLED
FULL-CURRENT
SOFT-START V+, V
HALF-CURRENT
3 LEDs
3.16
3.21
DD
30mA OUTPUT CURRENT vs. V+
3 LEDs
EFFICIENCY vs. V+
= 2.5V, T
FULL-CURRENT 6 LEDs
HALF-CURRENT
FULL-CURRENT 5 LEDs
3.62
3.72
HALF-CURRENT 6 LEDs
5 LEDs
V+ (V)
V+ (V)
V+ (V)
OUT
A
4.08
4.23
= +25NC, unless otherwise noted.)
FULL-CURRENT
HALF-CURRENT
(512/1024)
7 LEDs
7 LEDs
4.54
4.74
MAX6948B toc04
5.00
5.25
500mV/div
500mV/div
10V/div
5V/div
5V/div
V
V
GND
OUT
OUT
V+
V+
LX
4
3
2
1
0
2.70
SOFT-START V+, V
STANDBY CURRENT I
3.16
SWITCHING WAVEFORMS
+25NC
3.62
V+ (V)
-40NC
+105NC
Typical Operating Characteristics
OUT
4.08
(1024/1024)
RST
+85NC
vs. V+
4.54
MAX6948B toc05
MAX6948B toc02
5.00
500mV/div
5V/div
V
OUT
5.8
5.7
5.6
5.5
5.4
5.3
5.2
V+
2.70
SHUTDOWN RESPONSE (V+, V
STANDBY CURRENT I
SOFT-START V+, V
3.16
+25NC, +85NC, +105NC
3.62
V+ (V)
4.08
OUT
STBY
(10/1024)
vs. V+
4.54
-40NC
MAX6948B toc06
MAX6948B toc03
OUT)
5.00
500mV/div
V+
5V/div
V
GND
OUT