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Six-String WLED Driver with Integrated
Step-Up Converter
ABSOLUTE MAXIMUM RATINGS
V IN to AGND ........................................................-0.3V to +30V
FB_, SW to PGND .................................................-0.3V to +52V
PGND to AGND ....................................................-0.3V to +0.3V
V DDIO , PWM, EN, FPO, I.C. to AGND.....................-0.3V to +6V
COMP, ISET, R_FPWM, OVP, FSLCT
to AGND ................................................-0.3V to V DDIO + 0.3V
SW Switch Maximum Continuous RMS Current ...................1.6A
Continuous Power Dissipation (T A = +70 N C)
TQFN (derate 16.9mW/ N C above +70 N C) ..................1349mW
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, C COMP = 0.51nF, C COUT = 4.7μF, R COMP = 82.5k?, R ISET = 180k?, R FSLCT = 100k?, L = 10μH,
T A = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
V IN Input Voltage Range
V IN Quiescent Current
V DDIO Output Voltage
V DDIO Current Limit
V DDIO UVLO Threshold
V IN UVLO Threshold
CONDITIONS
MAX17127 is enabled, V EN = 3.3V, V IN = 26V
MAX17127 is disabled, EN = AGND
MAX17127 is enabled, V EN = 3.3V,
5.4V < V IN < 26V, 0A < I VDDIO < 10mA
MAX17127 is enabled, V EN = 3.3V, V IN = 5V, I VDDIO = 10mA,
dropout condition
MAX17127 is disabled, EN = AGND, 0A < I VDDIO < 50 F A
V DDIO is forced to 4.2V
Rising edge, typical hysteresis = 250mV
Falling edge
Rising edge
MIN
5
4.85
4.6
3.1
25
3.90
4.3
4.55
TYP
2.7
5
5
4.75
3.7
45
4.00
4.5
4.75
MAX
26
3.2
10
5.15
4.1
70
4.10
4.7
4.95
UNITS
V
mA
F A
V
V
mA
V
V
BOOST CONVERTER
SW On-Resistance
SW Leakage Current
20mA from SW to PGND
40V on SW, T A = +25 N C
0.12
0.25
1
I
F A
Operating Frequency
R FSLCT = 100k I
R FSLCT = 400k I
0.95
0.225
1.0
0.25
1.05
0.275
MHz
R FSLCT Range
Maximum Duty Cycle
Operating range
At f SW = 1MHz
90
91
95
500
k I
%
Minimum On-Time
(Note 1)
50
80
ns
SW Current Limit
Duty cycle = 75%
3.12
3.9
4.7
A
CONTROL INPUT
PWM, EN Logic-Input
High Level
PWM, EN Logic-Input Low
Level
2.1
0.8
V
V
EN Pulldown Resistor
120
200
280
k I
2
______________________________________________________________________________________
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