Datasheet

(Circuit of Figure 1. V
IN
= 12V, T
A
= +25°C, unless otherwise noted.)
Note 1: Specifications are guaranteed by design, not production tested.
(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
Minimum FB_ Regulation Voltage
I
FB_
= 30mA 400 770
mVI
FB_
= 20mA 670
I
FB_
= 10mA 630
FB_ On-Resistance V
FB_
= 50mV (includes 10Ω sense resistor) 28.4
Ω
FB_ Bias Current V
FB_
= 40V, T
A
= +25°C 1 μA
FB_ Minimum On-Time 400 700 ns
FAULT PROTECTION
OVP Threshold Voltage Rising edge, typical hysteresis = 90mV 1.23 1.27 V
FB_ Overvoltage Threshold 7 9 V
FB_ Open Threshold Voltage 130 280 mV
FB_ Check LED Source Current 0.4 1.3 mA
FB_ Check LED Time 0.7 1.3 ms
Overcurrent Fault Timer Latchoff timer 88 168 μs
PWM CONTROL
PWM Input On-Time 400 ns
PWM Input Frequency Range 0.1 25 kHz
BOOST CONVERTER EFFICIENCY vs. BRIGHTNESS
(V
S
= 2V, V
OUT
= 32V, I
OUT
= 120mA AT 100%)
MAX17127 toc02
BRIGHTNESS (%)
EFFICIENCY (%)
80604020
60
70
80
90
50
0 100
BOOST CONVERTER EFFICIENCY vs. INPUT VOLTAGE (V
S
)
(V
OUT
= 32V, I
OUT
= 120mA, BRIGHTNESS = 100%)
MAX17127 toc01
INPUT VOLTAGE (V)
EFFICIENCY (%)
23201714118
80
82
84
86
88
90
92
78
5 26
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Maxim Integrated │ 5
MAX17127 Six-String WLED Driver with
Integrated Step-Up Converter
Typical Operating Characteristics
Electrical Characteristics (continued)