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Low-Cost, 6-String WLED Drivers with
Quick-PWM Step-Up Converter
ABSOLUTE MAXIMUM RATINGS
FSEL, IN, BRT, EN to GND ..................................-0.3V to +28V
FB_, LX, OVP to PGND .........................................-0.3V to +48V
PGND to GND ......................................................-0.3V to +0.3V
V CC to GND.............................................................-0.3V to +6V
ISET to GND ............................................... -0.3V to VCC + 0.3V
LX Switch Continuous RMS Current.....................................1.6A
Continuous Power Dissipation (T A = +70 N C)
16-Pin Thin QFN (derate 14.7mW/ N C above +70 N C) .. 1176mW
Operating Temperature Range .......................... -40 N C to +85 N C
Junction Temperature .....................................................+150 N C
Storage Temperature Range............................ -60 N C to +150 N C
ESD
HBM .................................................................................±2kV
MM ................................................................................ ±200V
Lead Temperature (soldering, 10s) ................................+300 N C
Soldering Temperature (reflow) ......................................+260 N C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V IN = 12V, R ISET = 100k I , T A = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25 N C.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IN Input Voltage Range
IN Standby Current
IN not connected to V CC
IN connected to V CC
V EN = 3V, V IN = 26V, no external loads
V EN = 0V, V IN = 26V
6
3.0
3.2
0.1
26
5.5
4
5
V
mA
μA
V CC Output Voltage
V CC Current Limit
V CC UVLO Threshold
IN UVLO Threshold
V EN = 3V, 0 < I VCC < 10mA
V CC is forced to 3.5V; IN not connected to V CC
Rising edge, typical hysteresis = 100mV
Rising edge, typical hysteresis = 100mV;
IN not connected to V CC
3.6
15
2.75
5.5
3.8
30
2.8
5.75
4.0
45
2.85
5.9
V
mA
V
V
STEP-UP CONVERTER
LX On-Resistance
LX Leakage Current
100mA from LX to PGND
V LX = 40V, T A = +25NC
250
0.05
500
1
mω
μA
Off-Time
LX Peak Current Limit
FSEL = GND, V IN = 12V, V OVP = 22V
FSEL = V CC , V IN = 12V, V OVP = 22V
Duty cycle = 75%
450
900
2.5
500
1000
3
550
1100
3.5
ns
A
Minimum On-Time
50
ns
Minimum Output Regulation
Voltage
Maximum Output Regulation
Voltage
MAX17129 only
MAX17149 only
MAX17129 only
MAX17149 only
15
6.8
41.5
23.9
16.5
8.3
43
25.4
18
9.8
44.5
26.9
V
V
V
V
INPUT LEAKAGE/BIAS CURRENTS
EN Bias Current
BRT Bias Current
EN Input Impedance
0.3V < V EN < 3.5V, T A = +25°C
4.1V < V EN < 26V, T A = +25°C
0.3V < V BRT < 3.5V, T A = +25°C
4.1V < V BRT < 26V, T A = +25°C
750
1500
6
110
15
2000
μA
μA
kω
OVP Input Current
FSEL Bias Current
MAX17129 only; V OVP = 40V, V FB = 0.75V
MAX17149 only; V OVP = 20V, V FB = 0.75V
0.3V < V FSEL < 3.5V, T A = +25°C
4.1V < V FSEL < 26V, T A = +25°C
15
7.5
50
25
6
2000
μA
μA
μA
2
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