2 ______________________________________________________________________________________
MAX17127
Six-String WLED Driver with Integrated
Step-Up Converter
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.
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
= +70NC)
TQFN (derate 16.9mW/NC above +70NC) ..................1349mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -60NC to +150NC
ESD
HBM ................................................................................... 2kV
MM ...................................................................................200V
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V
IN
= 12V, C
COMP
= 0.51nF, C
COUT
= 4.7µF, R
COMP
= 82.5kΩ, R
ISET
= 180kΩ, R
FSLCT
= 100kΩ, L = 10µH,
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
ABSOLUTE MAXIMUM RATINGS
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range 5 26 V
V
IN
Quiescent Current
MAX17127 is enabled, V
EN
= 3.3V, V
IN
= 26V 2.7 3.2 mA
MAX17127 is disabled, EN = AGND 5 10 FA
V
DDIO
Output Voltage
MAX17127 is enabled, V
EN
= 3.3V,
5.4V < V
IN
< 26V, 0A < I
VDDIO
< 10mA
4.85 5 5.15
V
MAX17127 is enabled, V
EN
= 3.3V, V
IN
= 5V, I
VDDIO
= 10mA,
dropout condition
4.6 4.75
MAX17127 is disabled, EN = AGND, 0A < I
VDDIO
< 50FA 3.1 3.7 4.1 V
V
DDIO
Current Limit V
DDIO
is forced to 4.2V 25 45 70 mA
V
DDIO
UVLO Threshold Rising edge, typical hysteresis = 250mV 3.90 4.00 4.10 V
V
IN
UVLO Threshold
Falling edge 4.3 4.5 4.7
V
Rising edge 4.55 4.75 4.95
BOOST CONVERTER
SW On-Resistance 20mA from SW to PGND 0.12 0.25
I
SW Leakage Current 40V on SW, T
A
= +25NC 1 FA
Operating Frequency
R
FSLCT
= 100kI 0.95 1.0 1.05
MHz
R
FSLCT
= 400kI 0.225 0.25 0.275
R
FSLCT
Range Operating range 90 500 kI
Maximum Duty Cycle At f
SW
= 1MHz 91 95 %
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
2.1 V
PWM, EN Logic-Input Low
Level
0.8 V
EN Pulldown Resistor 120 200 280 kI
(38 páginas)
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