Datasheet

MAX8630W/MAX8630X
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
_______________________________________________________________________________________ 3
Note 1: Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2: Dropout voltage is defined as the LED_ to GND voltage at which current into LED_ drops 10% from the value at V
LED_
= 0.2V.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.6V, V
GND
= 0V, EN_ (PWM) = IN, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
1x mode, (V
IN
- V
OUT
) / I
OUT
0.8 1.5
Open-Loop OUT Resistance
1.5x mode, (1.5V
IN
- V
OUT
) / I
OUT
3.2 7.2
Ω
Maximum OUT Current V
IN
≥ 3.2V, V
OUT
= 3.9V
125
mA
OUT Short-Circuit Current Limit V
OUT
< 1.25V 57 mA
Switching Frequency 1
MHz
Direct-PWM Dimming Filter
Corner Frequency (MAX8630W)
C
CPWM
= 0.1µF, (PWM frequency of 900Hz to 200kHz
recommended)
10 Hz
EN_ (PWM) High Voltage V
IN
= 2.7V to 5.5V 1.4 V
EN_ (PWM) Low Voltage V
IN
= 2.7V to 5.5V 0.4 V
EN_ (PWM) Minimum Input
Slew Rate
V
IN
= 2.7V to 5.5V (recommended minimum slew rate) 1 V/µs
T
A
= +25°C
0.01
1
EN_ (PWM) Input Current V
EN_ (PWM)
= 0V or 5.5V
T
A
= +85°C 0.1
µA
EN_ (PWM) Low Shutdown Delay
(t
SHDN
)
4ms
EN_ t
LO
(See Figure 4) 0.5
500.0
µs
EN_ t
HI
(See Figure 4) 0.5 µs
Initial EN_ t
HI
(See Figure 4) First EN_ (PWM) high pulse 50 µs
Thermal Shutdown
+160
°C
Thermal-Shutdown Hysteresis 20 °C
Typical Operating Characteristics
(V
IN
= 3.6V, ENM = ENS = IN, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
DRIVING 5 LEDs
MAX8630W/X toc01
INPUT VOLTAGE (V)
EFFICIENCY (%)
3.93.63.33.0
10
20
30
40
50
60
70
80
90
100
0
2.7 4.2
I
LED
= 1.875mA
I
LED
= 8.125mA
I
LED
= 20mA
V
IN
FALLING
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 5 LEDs
MAX8630W/X toc02
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
3.93.63.0 3.3
20
40
60
80
120
100
140
160
0
2.7 4.2
I
LED
= 8.125mA
I
LED
= 1.875mA
I
LED
= 20mA
V
IN
FALLING
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 3 MAIN LEDs
MAX8630W/X toc03
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
3.93.63.0 3.3
20
40
60
80
120
100
140
160
0
2.7 4.2
I
LED
= 8.125mA
I
LED
= 1.875mA
I
LED
= 20mA
V
IN
FALLING