Datasheet

(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.)
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 3.2 mA
MAX17127 is disabled, EN = AGND 15 μA
V
DDIO
Output Voltage
MAX17127 is enabled, V
EN
= 3.3V,
5.4V < V
IN
< 26V, 0A < I
VDDIO
< 10mA
4.85 5.15
V
MAX17127 is enabled , V
EN
= 3.3V, V
IN
= 5V,
I
VDDIO
= 10mA, dropout condition
4.6
EN = AGND, 0A < I
VDDIO
< 50µA 3.1 4.1
V
DDIO
Current Limit V
DDIO
is forced to 4.2V 25 70 mA
V
DDIO
UVLO Threshold Rising edge, typical hysteresis = 250mV 3.90 4.10 V
V
IN
UVLO Threshold
Falling edge 4.3 4.7
V
Rising edge 4.55 4.95
BOOST CONVERTER
SW On-Resistance 20mA from SW to PGND 0.25
Ω
SW Leakage Current 40V on SW, T
A
= +25°C 1 μA
Operating Frequency
R
FSLCT
= 100kΩ 0.95 1.05
MHz
R
FSLCT
= 400kΩ 0.225 0.28
R
FSLCT
Operative Range 90 500 kΩ
Maximum Duty Cycle At f
SW
= 1MHz 92 %
Boost Output Voltage With suitable OVP network 45 V
Minimum On-Time (Note 1) 80 ns
CONTROL INPUT
PWM, EN Logic-Input High Level 2.1 V
PWM, EN Logic-Input Low Level 0.8 V
EN Pulldown Resistor 110 290 kΩ
FPO OUTPUT
FPO On Output-Voltage Low I
SINK
= 1mA, fault active 0.4 V
LED CURRENT
Full-Scale FB_ Output Current
R
ISET
= 120kΩ 29.1 30.9
mA
R
ISET
= 180kΩ 19.4 20.6
R
ISET
= 360kΩ 9.7 10.3
V
ISET
< 0.7V 0.2 0.4
R
ISET
Range
Operating range 100 400
kΩ
Accuracy = 3% 120 360
Current Regulation Between
Strings
10mA < I
FB_
< 30mA -2.0 +2.0 %
www.maximintegrated.com
Maxim Integrated │ 4
MAX17127 Six-String WLED Driver with
Integrated Step-Up Converter
Electrical Characteristics