Typical operating characteristics (continued) – Rainbow Electronics MAX8848Z User Manual
Page 5
High-Performance Negative Charge Pump
for 7 White LEDs in 3mm x 3mm Thin QFN
MAX8848Y/MAX8848Z
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(V
IN
= 3.6V, V
EN_
= V
IN
, circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
1.5x MODE OPERATING WAVEFORM
(V
IN
= 3V)
MAX8848Y toc13
100mA/div
20mA/div
0A
0A
100mV/div
AC-COUPLED
V
IN
I
IN
I
ILED1
ALL LEDS ON
24mA/LED
1µs/div
1x MODE OPERATING WAVEFORM
(V
IN
= 4V)
MAX8848Y toc12
100mA/div
20mA/div
0A
0A
100mV/div
AC-COUPLED
V
IN
I
IN
I
ILED1
ALL LEDS ON
24mA/LED
1µs/div
SINGLE-WIRE SERIAL-PULSE DIMMING
RESPONSE (MAX8848Y)
MAX8848Y toc15
20mA/div
0A
0V
50mA/div
0A
5V/div
1x MODE
ALL LEDS OPERATING
V
ENA
= V
ENB
TOTAL
I
LED
I
LED1
10ms/div
STARTUP AND SHUTDOWN RESPONSE
(MAX8848Y)
MAX8848Y toc14
200mV/div
AC-COUPLED
200mA/div
20mA/div
0A
0A
2V/div
V
ENA/ENB
V
IN
I
N
I
ILED1
ENA = ENB
24mA/LED
2ms/div
LED CURRENT vs. TEMPERATURE
MAX8848Y toc11
TEMPERATURE (°C)
LED CURRENT (mA)
60
35
10
-15
5
10
15
20
25
30
0
-40
85
24mA/LED
LED CURRENT MATCHING
vs. SUPPLY VOLTAGE
MAX8848Y toc10
SUPPLY VOLTAGE (V)
LED CURRENT (mA)
5.1
4.7
3.9
4.3
3.5
3.1
15.2
15.4
15.6
15.8
16.0
16.2
16.4
16.6
16.8
17.0
MAX8848Y
16mA/LED, V
IN
FALLING
15.0
2.7
5.5