MAX8645X_08 Datasheet, PDF (6/14 Pages) Maxim Integrated Products – 1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN

1x/1.5x/2x White LED Charge Pumps with Two
LDOs in 4mm x 4mm TQFN
Typical Operating Characteristics (continued)
(V_IN = V_{EN_} = 3.6V, circuit of Figure 2, T_A = +25°C, unless otherwise noted.)
INDIVIDUAL FLASH LED CURRENT
vs. R_SETF
2000
200
20
2
1
10
100
R_SETF (kΩ)
OPERATING WAVEFORMS (1x MODE)
MAX8645Y toc14
V_OUT
50mV/div
AC-COUPLED
V_IN
I_IN
6 MAIN LEDS AT 20mA EACH
400ns/div
20mV/div
AC-COUPLED
2mA/div
AC-COUPLED
OPERATING WAVEFORMS (1.5x MODE)
MAX8645Y toc15
V_OUT
50mV/div
AC-COUPLED
OPERATING WAVEFORMS (2x MODE)
MAX8645Y toc16
V_OUT
50mV/div
AC-COUPLED
V_IN
I_IN
6 MAIN LEDS AT 20mA EACH
400ns/div
20mV/div
AC-COUPLED
2mA/div
AC-COUPLED
V_IN
20mV/div
AC-COUPLED
6 MAIN LEDS AT 20mA EACH,
FLASH AT 400mA TOTAL
2mA/div
I_IN
AC-COUPLED
400ns/div
V_{ENM_}
I_OUT
STARTUP AND SHUTDOWN
MAIN LED RESPONSE
MAX8645Y toc17
6 MAIN LEDS AT 20mA EACH
5V/div
0V
100mA/div
0A
V_OUT
5V/div
0V
1ms/div
STARTUP AND SHUTDOWN
FLASH LED RESPONSE
MAX8645Y toc18
5V/div
V_ENF
0V
6 MAIN LEDS AT 20mA EACH,
400mA TOTAL FLASH
500mA/div
I_IN
0A
500mA/div
I_OUT
0A
5V/div
V_OUT
0V
1ms/div
6 _______________________________________________________________________________________