POWER SUPPLY |
VIN |
Input voltage range |
|
2.7 |
|
6.5 |
V |
VVIN_UVLO |
Undervoltage lockout threshold |
VIN falling |
|
2.2 |
2.3 |
V |
VIN rising |
|
|
2.45 |
VVIN_HYS |
VIN UVLO hysteresis |
|
|
100 |
|
mV |
IQ |
Operating quiescent current into VIN |
Device enable, switching 1.2 MHz and no load VIN = 3.6 V |
|
1.2 |
2 |
mA |
ISD |
Shutdown current |
EN = low |
|
1 |
2 |
µA |
EN and PWM |
VH |
EN Logic high |
|
1.2 |
|
|
V |
VL |
EN Logic Low |
|
|
|
0.4 |
V |
VH |
PWM logic high |
|
1.2 |
|
|
V |
VL |
PWM logic low |
|
|
|
0.4 |
V |
RPD |
EN pin and PWM pin internal pulldown resistor |
|
400 |
800 |
1600 |
kΩ |
tPWM_SD |
PWM logic low width to shutdown |
PWM high to low |
20 |
|
|
ms |
tEN_SD |
EN logic low width to shutdown |
EN high to low |
2.5 |
|
|
ms |
CURRENT REGULATION |
VISET_full |
ISET pin voltage |
Full brightness |
1.204 |
1.229 |
1.253 |
V |
KISET_full |
Current multiplier |
Full brightness |
|
1030 |
|
|
IFB_avg |
Current accuracy |
IISET = 20 μA, D = 100%, 0°C to 70°C |
–2% |
|
2% |
|
IISET = 20 µA, D = 100%, –40°C to 85°C |
–2.3% |
|
2.3% |
|
KM |
(IMAX – IAVG) / IAVG |
D = 100% |
|
1% |
2% |
|
D = 25% |
|
1% |
|
|
IIFB_max |
Current sink max output current |
IISET = 35 μA, each IFBx pin |
30 |
|
|
mA |
POWER SWITCH |
RDS(on) |
Switch MOSFET on resistance |
VIN = 3.6 V |
|
0.25 |
|
Ω |
VIN = 3 V |
|
0.3 |
|
ILEAK_SW |
Switch MOSFET leakage current |
VSW = 35 V, TA = 25°C |
|
|
1 |
µA |
OSCILLATOR |
fSW |
Oscillator frequency |
|
1000 |
1200 |
1500 |
kHz |
Dmax |
Maximum duty cycle |
Measured on the drive signal of switch MOSFET |
91% |
95% |
|
|
BOOST VOLTAGE CONTROL |
VIFB_reg |
IFBx feedback regulation voltage |
IIFBx = 20 mA, measured on IFBx pin which has a lower voltage |
|
90 |
|
mV |
Isink |
COMP pin sink current |
|
|
12 |
|
µA |
Isource |
COMP pin source current |
|
|
5 |
|
µA |
Gea |
Error amplifier transconductance |
|
30 |
55 |
80 |
µmho |
Rea |
Error amplifier output resistance |
|
|
45.5 |
|
MΩ |
fea |
Error amplifier crossover frequency |
5 pF connected to COMP pin |
|
1.65 |
|
MHz |
PROTECTION |
ILIM |
Switch MOSFET current limit |
D = Dmax, 0°C to 70°C |
1 |
1.5 |
2 |
A |
ILIM_Start |
Switch MOSFET start up current limit |
D = Dmax |
|
0.7 |
|
A |
tHalf_LIM |
Time window for half current limit |
|
|
5 |
|
ms |
VOVP_SW |
SW pin over voltage threshold |
36 |
37.5 |
39 |
V |
VOVP_IFB |
IFBx pin over voltage threshold |
Measured on IFBx pin |
4.2 |
4.5 |
4.8 |
V |
VACKNL |
Acknowledge output voltage low Open drain, Rpullup = 15 kΩ to VIN(1) |
|
|
|
0.4 |
V |
THERMAL SHUTDOWN |
Tshutdown |
Thermal shutdown threshold |
|
|
160 |
|
°C |
Thys |
Thermal shutdown hysteresis |
|
|
15 |
|
°C |