Max6948b, Typical operating characteristics – Rainbow Electronics MAX6948B User Manual
Page 6
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
6
MAX6948B
Typical Operating Characteristics
(V+ = 3.3V, V
DD
= 2.5V, T
A
= +25NC, unless otherwise noted.)
EFFICIENCY vs. V+
MAX6948B toc01
V+ (V)
EFFICIENCY (%)
4.74
4.23
3.72
3.21
65
70
75
80
85
90
60
2.70
5.25
FULL-CURRENT
3 LEDs
HALF-CURRENT
3 LEDs
FULL-CURRENT 5 LEDs
FULL-CURRENT
7 LEDs
HALF-CURRENT
5 LEDs
HALF-CURRENT
7 LEDs
SWITCHING WAVEFORMS
MAX6948B toc02
500mV/div
V+
5V/div
V
OUT
10V/div
LX
GND
SOFT-START V+, V
OUT
(10/1024)
MAX6948B toc03
500mV/div
V+
5V/div
V
OUT
SOFT-START V+, V
OUT
(512/1024)
MAX6948B toc04
500mV/div
V+
5V/div
V
OUT
SOFT-START V+, V
OUT
(1024/1024)
MAX6948B toc05
500mV/div
V+
5V/div
V
OUT
SHUTDOWN RESPONSE (V+, V
OUT)
MAX6948B toc06
500mV/div
V+
5V/div
V
OUT
GND
V+ (V)
MAX6948B toc07
I
WLE
D
(mA)
15
25
35
5
V+ (V)
4.54
4.08
3.62
3.16
2.70
5.00
I
WLED
30mA OUTPUT CURRENT vs. V+
FULL-CURRENT 6 LEDs
HALF-CURRENT 6 LEDs
STANDBY CURRENT I
RST
vs. V+
MAX6948B toc08
STANDBY CURRENT
(µ
A)
1
2
3
4
0
V+ (V)
+85NC
-40NC
+25NC
+105NC
4.54
4.08
3.62
3.16
2.70
5.00
5.3
5.4
5.5
5.6
5.7
5.8
5.2
MAX6948B toc09
STANDBY CURRENT (mA)
V+ (V)
STANDBY CURRENT I
STBY
vs. V+
+25NC, +85NC, +105NC
-40NC
4.54
4.08
3.62
3.16
2.70
5.00