Datasheet

MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
8 _______________________________________________________________________________________
EN_ INPUT LOGIC LEVELS MODE LED CURRENT
EN1 = 0, EN2 = 0 Shutdown mode 0
EN1 = 0, EN2 = 1 On, V
SET
= 200mV, LED1 threshold = 200mV 1/3
EN1 = 1, EN2 = 0 On, V
SET
= 400mV, LED1 threshold = 300mV 2/3
EN1 = 1, EN2 = 1 On, V
SET
= 600mV, LED1 threshold = 400mV Full
Table 1. Enable Input Modes
OUTPUT
(mA)
C
IN
(µF)
C1
(µF)
C2
(µF)
C
OUT
(µF)
40 1 0.22 0.22 4.7
80 1 0.47 0.47 4.7
150 1 1.0 1.0 4.7
Table 2. Capacitor Selection
COMPONENT NAME
VALUE
(µF)
MANUFACTURER
PART NO. DESCRIPTION
C
IN
1 Taiyo Yuden
JMK107BJ105MA
1µF ±20%, 6.3V X5R ceramic capacitor (0603)
C
OUT
4.7 Taiyo Yuden
JMK212BJ475MG
4.7µF ±20%, 6.3V X5R ceramic capacitor (0805)
1 Taiyo Yuden
JMK107BJ105MA
1µF ±20%, 6.3V X5R ceramic capacitor (0603)
0.47 Taiyo Yuden
LMK107BJ474MA
0.47µF ±20%, 10V X5R ceramic capacitor (0603)C1 and C2
0.22 Taiyo Yuden
LMK107BJ224KA
0.22µF ±10%, 10V X7R ceramic capacitor (0603)
Table 3. Capacitor Manufacturers